JP7724871B2 - Sound control device - Google Patents

Description

The present invention relates to an acoustic control device.

2. Description of the Related Art Conventionally, there is known an audio control device that can adjust the playback speed of music (see, for example, Non-Patent Document 1).
The audio control device described in Non-Patent Document 1 includes a rotatable encoder, and is capable of adjusting the playback speed of music in accordance with the rotation of the encoder. In the audio control device, when the encoder is rotated clockwise, the tempo corresponding to the playback speed of music increases by a decimal point. On the other hand, when the encoder is rotated counterclockwise, the tempo decreases by a decimal point. The audio control device also includes a SHIFT button, and when the encoder is rotated clockwise with the SHIFT button pressed, the tempo increases by a decimal point. On the other hand, when the encoder is rotated counterclockwise with the SHIFT button pressed, the tempo decreases by a decimal point.

Native Instruments GmbH, "TRAKTOR KONTROL S5 Manual Japanese", Internet, [Search date: June 27, 2021], URL: https://www.native-instruments.com/fileadmin/ni_media/downloads/manuals/traktor/traktor_kontrol_s8_manual_japanese.pdf

However, with the configuration described in Non-Patent Document 1, when significantly changing the playback speed of a song, it is necessary to rotate the encoder while pressing the SHIFT button, which poses a problem in that the operation of adjusting the playback speed of a song is cumbersome.

An audio control device according to one aspect of the present invention is an audio control device capable of adjusting the playback speed of a song, and includes a rotatable dial that accepts operations to adjust the playback speed of the song, and a control unit that changes the amount of change in the playback speed of the song per unit rotation angle of the dial depending on the rotation state of the dial.

1 is a schematic diagram showing the configuration of an acoustic control device according to a first embodiment. FIG. 2 is a block diagram showing the configuration of a control unit according to the first embodiment. 5A to 5C are diagrams illustrating a rotation operation of a dial according to the first embodiment. FIG. 4 is a diagram showing an example of display content in a direct display mode according to the first embodiment. FIG. 6 is a diagram showing an example of display content in a ratio display mode according to the first embodiment. FIG. 4 is a diagram showing an example of display content in a figure display mode according to the first embodiment. 10A and 10B are diagrams illustrating the relationship between the ratio of the adjusted BPM to the original BPM and the displayed graphic according to the first embodiment. FIG. 4 is a view showing an example of display content in a slider display mode according to the first embodiment. 10A and 10B are diagrams illustrating the relationship between the ratio of the adjusted BPM to the original BPM and the displayed graphic according to the modification of the first embodiment. 10A and 10B are diagrams illustrating the relationship between the ratio of the adjusted BPM to the original BPM and the displayed graphic according to the modification of the first embodiment. FIG. 10 is a schematic diagram showing a dial provided in an acoustic control device according to a second embodiment. FIG. 11 is a diagram showing an example of a display mode of a ratio display section according to the second embodiment. FIG. 11 is a diagram showing an example of a display mode of a ratio display section according to the second embodiment. FIG. 10 is a diagram showing the arrangement of a ratio display unit according to a modification of the second embodiment. 5A and 5B are schematic diagrams showing modifications of the acoustic control device according to the first and second embodiments.

[First embodiment]
A first embodiment of the present invention will be described below with reference to the drawings.
[General configuration of the acoustic control device]
FIG. 1 is a schematic diagram showing the configuration of an acoustic control apparatus 1 according to this embodiment.
The acoustic control device 1 according to this embodiment is configured to be able to adjust the playback speed of input music. Specifically, the acoustic control device 1 adjusts the playback speed of music by adjusting the BPM (Beats Per Minute) of the music. Note that the BPM of a music represents the tempo at the time of music playback, i.e., the number of beats per minute at the time of music playback. In this embodiment, the acoustic control device 1 is a mixer that individually controls the playback of a first music piece loaded on a first channel and the playback of a second music piece loaded on a second channel, mixes the first music piece played on the first channel and the second music piece played on the second channel, and outputs an audio signal corresponding to the mixed music.
As shown in Fig. 1, the acoustic control device 1 includes a housing 2, two channel operation units 3 (3A, 3B), and a crossfader 4. Although not shown in Fig. 1, the acoustic control device 1 also includes a control unit 5 (see Fig. 2) that controls the operation of the acoustic control device 1.

[Housing configuration]
The housing 2 is formed in a substantially rectangular parallelepiped shape and houses the control unit 5. The housing 2 has a top surface 21, an upper surface 22, a lower surface 23, a left side surface 24, a right side surface 25, and a bottom surface (not shown).
On the top surface 21, two channel operation units 3 (3A, 3B) and a crossfader 4 are arranged.

[Channel operation section configuration]
The two channel operation units 3 (3A, 3B) operate the playback status of the music loaded on the corresponding channels. The two channel operation units 3 are a first channel operation unit 3A that operates the playback status of a first music piece loaded on a first channel, and a second channel operation unit 3B that operates the playback status of a second music piece loaded on a second channel.
Each channel operation section 3 has a jog dial 31, an equalizer adjustment section 32, a channel fader 33, and a playback speed operation section .

The jog dial 31 is rotatably mounted on the top surface 21 and is used to adjust the playback direction and playback speed of the music being played. The user can perform a scratch operation, which is unique to DJ performances, by combining changes in the rotation direction and rotation speed of the jog dial 31.

The equalizer adjustment unit 32 performs equalizer adjustment processing for the corresponding channel and includes a level adjustment unit 321, a high frequency band adjustment unit 322, a mid frequency band adjustment unit 323, a low frequency band adjustment unit 324, and an effect adjustment unit 325.
The level adjustment unit 321 adjusts the input level of the input music piece.
The high frequency band adjusting unit 322 adjusts the volume of the high frequency band of the input music piece. The high frequency band is, for example, a frequency band of 4649 Hz or higher.
The mid-frequency band adjustment unit 323 adjusts the volume of the mid-frequency band of the input music. The mid-frequency band is, for example, a frequency band exceeding 284 Hz and below 4649 Hz.
The low frequency band adjustment unit 324 adjusts the volume of the low frequency band of the input music. The low frequency band is, for example, a frequency band below 284 Hz.
The effect adjustment section 325 adjusts the effect amount of the effect set in the corresponding channel operation section 3 .
The channel fader 33 adjusts the volume output from the corresponding channel operation unit 3 .

The playback speed operation unit 34 receives an operation to adjust the playback speed of a song loaded on a corresponding channel. The playback speed operation unit 34 includes a dial 341, a detection unit 342, a notification unit 343, a display unit 344, and a switching operation unit 345.
The dial 341 receives an operation to adjust the playback speed of music. The dial 341 is provided so as to be rotatable clockwise and counterclockwise when viewed from a position facing the top surface 21. More specifically, the dial 341 can be rotated clockwise or counterclockwise any number of times until the rotation is restricted by a notification unit 343, which will be described later.
The detection unit 342 detects the rotation state of the dial 341. Specifically, the detection unit 342 has a rotary encoder and detects the rotation acceleration and rotation angle of the dial 341. The detection unit 342 outputs the detected rotation acceleration and rotation angle to the control unit 5. As will be described in detail later, the control unit 5 adjusts the BPM of the music loaded on the corresponding channel based on the detection result of the detection unit 342, thereby changing the playback speed of the music.

The notification unit 343, under the control of the control unit 5 described later, notifies the user that the ratio of the BPM of the song after adjusting the playback speed to the BPM inherent to the song has reached a predetermined value. In this embodiment, the notification unit 343 notifies the user that the ratio has reached the predetermined value by restricting the rotation of the dial 341. Notification by the notification unit 343 will be described in detail later.
The display unit 344 displays information relating to the playback speed of the music under the control of the control unit 5. The contents displayed by the display unit 344 will be described in detail later.
The switching operation unit 345 switches the display content of the display unit 344. In other words, the switching operation unit 345 switches the display mode of the display unit 344. The display modes will be described in detail later.

In the following explanation, for convenience, the playback speed operation unit 34, dial 341, detection unit 342, notification unit 343, display unit 344 and switching operation unit 345 of the first channel operation unit 3A will be referred to as first playback speed operation unit 34A, first dial 341A, first detection unit 342A, first notification unit 343A, first display unit 344A and first switching operation unit 345A, and the playback speed operation unit 34, dial 341, detection unit 342, notification unit 343, display unit 344 and switching operation unit 345 of the second channel operation unit 3B will be referred to as second playback speed operation unit 34B, second dial 341B, second detection unit 342B, second notification unit 343B, second display unit 344B and second switching operation unit 345B.

The crossfader 4 has an operator 41 that can move left and right. As the operator 41 is moved leftward, the proportion of the volume of the first channel in the volume output from the sound control device 1 increases. Also, as the operator 41 is moved rightward, the proportion of the volume of the second channel in the volume output from the sound control device 1 increases.

[Configuration of control unit]
FIG. 2 is a block diagram showing the configuration of the control unit 5.
The control unit 5 is configured by a circuit board having a processing unit such as a CPU (Central Processing Unit). As described above, the control unit 5 controls the operation of the acoustic control device 1. Specifically, the control unit 5 not only plays the music loaded on each channel, but also adjusts the playback speed of the music based on the operating state of the dial 341.
As shown in FIG. 2, the control unit 5 has a first playback unit 51, a first adjustment unit 52, a first control unit 53, a second playback unit 54, a second adjustment unit 55, a second control unit 56, a mode switching unit 57, and a display control unit 58.

The first playback unit 51 plays back the first music piece loaded on the first channel.
The first adjustment unit 52 adjusts the playback speed of the first music piece. The first adjustment unit 52 adjusts the playback state of the first music piece in response to a user's operation on the first channel operation unit 3A. For example, the first adjustment unit 52 adjusts the playback speed and playback direction of the first music piece being played by the first playback unit 51 in response to a user's operation on the jog dial 31 of the first channel operation unit 3A.
Furthermore, for example, the first adjustment unit 52 adjusts the playback speed of the first music piece by adjusting the BPM of the first music piece played by the first playback unit 51 based on the detection result by the first detection unit 342A that detects the rotation state of the first dial 341A. Note that the method of adjusting the playback speed of the first music piece by the first adjustment unit 52 will be described in detail later.

The first control unit 53 controls the playback of the first music data by the first playback unit 51 and the output of music obtained by playing the first music data. For example, the first control unit 53 causes the first playback unit 51 to play the first music in a playback state adjusted by the first adjustment unit 52. The first control unit 53 also controls the output of music obtained by playing the first music piece by the first playback unit 51 in response to a user's operation on the equalizer adjustment unit 32 of the first channel operation unit 3A. Furthermore, the first control unit 53 controls the first notification unit 343A. The control of the first notification unit 343A by the first control unit 53 will be described in detail later.

The second playback unit 54 plays the second music piece loaded on the second channel.
The second adjustment unit 55 adjusts the playback speed of the second music piece. Similar to the first adjustment unit 52, the second adjustment unit 55 adjusts the playback state of the second music piece data in response to a user's operation on the second channel operation unit 3B. For example, the second adjustment unit 55 adjusts the playback speed of the second music piece by adjusting the BPM of the second music piece played by the second playback unit 54 based on the detection result by the second detection unit 342B, which detects the rotation state of the second dial 341B. The method of adjusting the playback speed of the first music piece by the second adjustment unit 55 will be described in detail later.
Similar to the first control unit 53, the second control unit 56 controls the playback of the second music by the second playback unit 54 and the output of the music obtained by playing the second music, and also controls the second notification unit 343B.

The mode switching unit 57 switches the display mode of the first display unit 344A in response to an operation on the first switching operation unit 345A. The mode switching unit 57 also switches the display mode of the second display unit 344B in response to an operation on the second switching operation unit 345B. In other words, the display mode is set individually for each of the first channel operation unit 3A and the second channel operation unit 3B.
The display modes switched by the mode switching unit 57 will be described in detail later.

The display control unit 58 causes the first display unit 344A to display information about the playback speed of the first music piece adjusted by the first adjustment unit 52. More specifically, the display control unit 58 causes the first display unit 344A to display information about the BPM corresponding to the playback speed of the first music piece. The display control unit 58 also causes the second display unit 344B to display information about the playback speed of the second music piece adjusted by the second adjustment unit 55. More specifically, the display control unit 58 causes the second display unit 344B to display information about the BPM corresponding to the playback speed of the second music piece. The display contents of each display unit 344A, 344B differ depending on the display mode of each channel operation unit 3. The content displayed on the display unit 344 by the display control unit 58 will be described in detail later.

[Adjust playback speed]
The first adjustment unit 52 adjusts the playback speed of the first music piece based on the rotation state of the first dial 341A detected by the first detection unit 342A. Specifically, the first adjustment unit 52 acquires the rotation direction, rotation acceleration, and rotation angle of the first dial 341A as detection results by the first detection unit 342A. The first adjustment unit 52 then calculates the rotation speed of the first dial 341A based on the rotation acceleration of the first dial 341A, and adjusts the playback speed of the first music piece by adjusting the BPM of the first music piece based on the rotation direction, rotation speed, and rotation angle of the first dial 341A. In other words, the rotation state of the first dial 341A that the first adjustment unit 52 refers to when adjusting the playback speed of the first music piece includes the rotation speed of the first dial 341A.

For example, when the first dial 341A is rotated clockwise as viewed from a position facing the top surface 21, the first adjustment unit 52 increases the BPM corresponding to the current playback speed of the first music piece, thereby increasing the playback speed of the current first music piece. Clockwise rotation corresponds to the first rotation direction.
On the other hand, when the first dial 341A is rotated counterclockwise as viewed from the position facing the top surface 21, the first adjustment unit 52 decreases the BPM of the current first music piece, thereby decreasing the playback speed of the current first music piece. Counterclockwise rotation corresponds to the opposite direction to the first rotation direction.

Furthermore, the first adjustment unit 52 changes the playback speed of the first music piece based on the rotation speed and rotation angle of the first dial 341A.
Specifically, the first adjustment unit 52 sets the amount of change in the playback speed of the first music piece per unit rotation angle of the first dial 341A as the first change amount while the rotation speed of the first dial 341A is less than a predetermined speed. That is, the first adjustment unit 52 sets the amount of change in the BPM of the first music piece per unit rotation angle of the first dial 341A as the first change amount while the rotation speed of the first dial 341A is less than the predetermined speed. Then, while the rotation speed of the first dial 341A is less than the predetermined speed, the first adjustment unit 52 adds or subtracts the first change amount to or from the current BPM of the first music piece each time the rotation angle of the first dial 341A reaches a unit rotation angle.
For example, if the unit rotation angle is 3° and the first change amount is 0.1, while the rotation speed of the first dial 341A is less than the predetermined speed, the first adjustment unit 52 adds or subtracts 0.1 to the BPM of the first music piece for every 3° rotation of the first dial 341A. Therefore, for example, if the first dial 341A is rotated 90° clockwise at a rotation speed less than the predetermined speed, the BPM of the first music piece will be a value obtained by adding 3 to the BPM of the first music piece before the first dial 341A was rotated 90° clockwise. Also, for example, if the first dial 341A is rotated 30° counterclockwise at a rotation speed less than the predetermined speed, the BPM of the first music piece will be a value obtained by subtracting 1 from the BPM of the first music piece before the first dial 341A was rotated 30° counterclockwise.

Furthermore, while the rotation speed of the first dial 341A is equal to or greater than a predetermined speed, the first adjustment unit 52 sets the amount of change in the playback speed of the first music piece per unit rotation angle of the first dial 341A to a second change amount that is greater than the first change amount. In other words, while the rotation speed of the first dial 341A is equal to or greater than the predetermined speed, the first adjustment unit 52 sets the amount of change in the BPM of the first music piece per unit rotation angle of the first dial 341A to the second change amount. Then, while the rotation speed of the first dial 341A is equal to or greater than the predetermined speed, the first adjustment unit 52 adds or subtracts the second change amount to the current BPM of the first music piece each time the rotation angle of the first dial 341A reaches a unit rotation angle.
For example, if the unit rotation angle is 3° and the second change amount is 1°, the first adjustment unit 52 adds or subtracts 1 to the BPM of the first music piece every time the first dial 341A is rotated 3° while the rotation speed of the first dial 341A is equal to or greater than the predetermined speed. Therefore, for example, when the first dial 341A is rotated 90° clockwise at a rotation speed equal to or greater than the predetermined speed, the BPM of the first music piece becomes a value obtained by adding 30 to the BPM of the first music piece before the first dial 341A was rotated 90° clockwise. Furthermore, for example, when the first dial 341A is rotated 30° counterclockwise at a rotation speed equal to or greater than the predetermined speed, the BPM of the first music piece becomes a value obtained by subtracting 10 from the BPM of the first music piece before the first dial 341A was rotated 30° counterclockwise.

FIG. 3 is a diagram showing the rotation operation of the first dial 341A when adjusting the playback speed of the first piece of music.
In this way, the amount of change in the BPM of the first music piece and the amount of change in the playback speed of the first music piece change according to the rotation speed of the first dial 341A. Therefore, for example, as shown in Fig. 3, by setting the rotation speed of the first dial 341A when rotating the first dial 341A by a rotation angle α to be less than a predetermined speed, the amount of change in the BPM of the first music piece per unit rotation angle can be set to the first change amount. This allows the BPM of the first music piece to be changed in fine increments.
On the other hand, by setting the rotation speed of the first dial 341A when rotating the first dial 341A by the rotation angle α to a predetermined speed or higher, the amount of change in the BPM of the first music piece per unit rotation angle can be set to the second amount of change, thereby allowing for a large change in the BPM of the first music piece.
The second adjustment unit 55 also adjusts the playback speed of the music piece in this manner.

[Notification to the user via the notification section]
Next, notification to the user by the notification unit 343 will be described.
The following describes notification to the user by the first notification unit 343A controlled by the first control unit 53. That is, the following describes the restriction on rotation of the first dial 341A by the first notification unit 343A. The same applies to notification to the user by the second notification unit 343B controlled by the second control unit 56.

Note that the BPM specific to a song, i.e., the BPM of the song before the playback speed is adjusted, is referred to as the original BPM, and the BPM of the song after the playback speed has been adjusted is referred to as the adjusted BPM. Therefore, the BPM specific to the first song is referred to as the first original BPM, and the BPM of the first song after the playback speed has been adjusted by the first adjustment unit 52 is referred to as the first adjusted BPM.
Furthermore, the ratio of the BPM of a song after adjusting the playback speed to the BPM inherent to the song is referred to as the "adjusted ratio." In other words, the ratio of the adjusted BPM to the original BPM is referred to as the "adjusted ratio." Therefore, the ratio of the first adjusted BPM to the first original BPM is referred to as the "first adjusted ratio." The adjusted ratio is a value expressed as a percentage (%).

When the first dial 341A is rotated as described above, the BPM of the first song increases, and the first post-adjustment ratio reaches a predetermined value, the first control unit 53 operates the first notification unit 343A to restrict further rotation of the first dial 341A in the same direction. In other words, when the first post-adjustment ratio reaches the predetermined value, the first control unit 53 restricts further rotation of the first dial 341A in the same direction by the first notification unit 343A. For this reason, the notification unit 343 can be said to be a restriction unit.

Specifically, when the first dial 341A is rotated clockwise to increase the BPM of the first song and the first post-adjustment ratio reaches a first limit value, which is a predetermined value, the first control unit 53 causes the first notification unit 343A to restrict further clockwise rotation of the first dial 341A. This notifies the user that the first post-adjustment ratio has reached the first limit value. When the first dial 341A is rotated counterclockwise from a state in which the first notification unit 343A restricts clockwise rotation of the first dial 341A and the first post-adjustment ratio falls below the first limit value, the restriction by the first notification unit 343A is released. An example of the first limit value is "200%."

Similarly, when the first dial 341A is rotated counterclockwise to decrease the BPM of the first music piece and the first post-adjustment ratio reaches a second limit value, which is a predetermined value, the first control unit 53 causes the first notification unit 343A to restrict further counterclockwise rotation of the first dial 341A. This notifies the user that the first post-adjustment ratio has reached the second limit value. When the first dial 341A is rotated clockwise from a state in which the first notification unit 343A restricts counterclockwise rotation of the first dial 341A and the first post-adjustment ratio becomes greater than the second limit value, the restriction by the first notification unit 343A is released. An example of the second limit value is "0%."

Note that the first notification unit 343A may notify the user that the first post-adjustment ratio has reached the first limit value or the second limit value by another method, instead of or in addition to restricting the rotation of the first dial 341A. For example, the first notification unit 343A may output a notification sound or vibrate the first dial 341A.

[Display content]
Next, the display contents of the display unit 344 will be described for each display mode.
The display modes that can be switched by the mode switching unit 57 include a direct display mode, a ratio display mode, a graphic display mode, and a slider display mode. In the following explanation, the display content of the first display unit 344A will be explained, but the display content of the second display unit 344B is similar.

[Direct display mode]
FIG. 4 is a diagram showing an example of the display content of the first display section 344A in the direct display mode.
4, the direct display mode is a display mode in which the first display unit 344A displays the first original BPM and the first adjusted BPM. That is, in the direct display mode, the display control unit 58 causes the first display unit 344A to display the first original BPM and the first adjusted BPM. For this reason, the screen DP1 displayed on the first display unit 344A in the direct display mode is provided with an original BPM display section DP11 that displays the first original BPM and an adjusted BPM display section DP12 that displays the first adjusted BPM.

[Percentage display mode]
FIG. 5 is a diagram showing an example of the display content of the first display section 344A in the ratio display mode.
5, the percentage display mode is a display mode in which the first display unit 344A displays the first original BPM and the ratio of the first adjusted BPM to the first original BPM (first adjusted ratio). That is, in the percentage display mode, the display control unit 58 causes the first display unit 344A to display the first original BPM and the first adjusted ratio. Therefore, the screen DP2 displayed on the first display unit 344A in the percentage display mode is provided with an original BPM display unit DP11 and a ratio display unit DP22 that displays the first adjusted ratio. Note that the ratio displayed in the percentage display mode is an example of information indicating the ratio of the BPM of the song after playback speed adjustment to the BPM inherent to the song.

[Graphic display mode]
FIG. 6 is a diagram showing an example of the display content of the first display section 344A in the graphic display mode.
The graphic display mode is a display mode in which the first display section 344A displays the first original BPM and one of the graphics FG1 and FG2, as shown in Fig. 6. The graphics FG1 and FG2 are graphics corresponding to the comparison result between the first original BPM and the first adjusted BPM. More specifically, the graphics FG1 and FG2 are graphics indicating the magnitude relationship between the first original BPM and the first adjusted BPM, with the graphic FG1 being an upward-pointing triangle and the graphic FG2 being a downward-pointing triangle.
For this reason, the screen DP3 displayed on the first display section 344A in the figure display mode is provided with an original BPM display section DP11 and a figure display section DP31 that displays the figures FG1 and FG2.

[When the first adjusted BPM is greater than the first original BPM]
FIG. 7 is a diagram illustrating the relationship between the first adjusted ratio and the displayed graphics FG1 and FG2.
In the graphic display mode, when the first adjusted BPM is greater than the first original BPM, the display control unit 58 displays a graphic FG1 in the first display section 344A, but does not display a graphic FG2, as shown in Fig. 7. In other words, the graphic FG1 is a graphic indicating that the first adjusted BPM is greater than the first original BPM.
In this case, if the first adjusted ratio is greater than 100% and less than the first threshold, the display control unit 58 minimizes the brightness of the graphic FG1 displayed on the first display unit 344A. The first threshold is a value greater than 100%, and is 110% in this embodiment. However, the first threshold can be changed as appropriate.

Furthermore, when the first post-adjustment ratio is equal to or greater than the first threshold value and less than the second threshold value, the display control unit 58 increases the brightness of the graphic FG1 displayed on the first display unit 344A. That is, the brightness of the graphic FG1 displayed when the first post-adjustment ratio is equal to or greater than the first threshold value and less than the second threshold value is higher than the brightness of the graphic FG1 displayed when the first post-adjustment ratio is greater than 100% and less than the first threshold value. The second threshold value is a value greater than the first threshold value, and in this embodiment, the second threshold value is 120%. However, the second threshold value can be changed as appropriate.
Furthermore, when the first adjusted ratio is equal to or greater than the second threshold, the display control unit 58 maximizes the brightness of the graphic FG1 displayed on the first display portion 344A.
That is, the brightness of the graphic FG1 displayed when the first adjusted ratio is greater than 100% increases as the difference between the first original BPM and the first adjusted BPM increases, and decreases as the difference between the first original BPM and the first adjusted BPM decreases. In other words, the brightness of the graphic FG1 decreases as the first adjusted BPM approaches the first original BPM, and increases as the first adjusted BPM moves away from the first original BPM.
Such a difference in brightness of the graphic FG1 is an example of information indicating the ratio of the BPM of the music piece after the playback speed adjustment to the BPM inherent in the music piece.

[When the first adjusted BPM is smaller than the first original BPM]
In the graphic display mode, if the first adjusted BPM is smaller than the first original BPM, the display control unit 58 displays the downward-pointing triangle graphic FG2 on the first display unit 344A, and does not display the upward-pointing triangle graphic FG1. In other words, the graphic FG2 is a graphic indicating that the first adjusted BPM is smaller than the first original BPM.
In this case, if the first adjusted ratio is greater than the third threshold but less than 100%, the display control unit 58 minimizes the brightness of the figure FG2. The third threshold is a value less than 100%, and is 90% in this embodiment. However, the third threshold can be changed as needed.

Furthermore, when the first post-adjustment ratio is equal to or less than the third threshold but greater than the fourth threshold, the display control unit 58 increases the brightness of the figure FG2. That is, the brightness of the figure FG2 displayed when the first post-adjustment ratio is greater than the fourth threshold but less than the third threshold is higher than the brightness of the figure FG2 displayed when the first post-adjustment ratio is greater than the third threshold but less than 100%. The fourth threshold is a value smaller than the third threshold, and is 80% in this embodiment. However, the fourth threshold can be changed as appropriate.
Furthermore, when the first adjusted ratio is equal to or less than the fourth threshold, the display control unit 58 maximizes the brightness of the graphic FG2.
That is, the brightness of the graphic FG2 displayed when the first adjusted ratio is smaller than 100% increases as the difference between the first original BPM and the first adjusted BPM increases, and decreases as the difference between the first original BPM and the first adjusted BPM decreases. In other words, the brightness of the graphic FG2 decreases as the first adjusted BPM approaches the first original BPM, and increases as the first adjusted BPM moves away from the first original BPM.
Such a difference in brightness of the graphic FG2 is an example of information indicating the ratio of the BPM of the music piece after the playback speed adjustment to the BPM inherent in the music piece.

[When the first adjusted BPM is the same as the first original BPM]
When the first adjusted BPM is the same value as the first original BPM, the graphics FG1 and FG2 are not displayed, as shown in FIG.
As described above, by checking the cases where the graphic FG1 is displayed, the graphic FG2 is displayed, and the graphic FG1 and the graphic FG2 are not displayed, the user can intuitively grasp the magnitude of the first adjusted BPM relative to the first original BPM. In addition, the user can intuitively grasp the first adjusted ratio.

In this embodiment, the brightness of the figures FG1 and FG2 increases as the difference between the original BPM and the adjusted BPM increases. In other words, the brightness of the figures FG1 and FG2 decreases as the adjusted BPM approaches the original BPM. This makes it easier for the user to understand that the adjusted BPM is a value that is different from the original BPM.
On the other hand, the brightness of the figures FG1 and FG2 may increase as the difference between the original BPM and the adjusted BPM decreases, and decrease as the difference between the original BPM and the adjusted BPM increases. Specifically, the brightness of the figure FG1 displayed when the first post-adjustment ratio is greater than 100% may be highest when the first post-adjustment ratio is smaller than a first threshold value and lowest when the first post-adjustment ratio is equal to or greater than a second threshold value. Similarly, the brightness of the figure FG2 displayed when the first post-adjustment ratio is less than 100% may be highest when the first post-adjustment ratio is greater than a third threshold value and lowest when the first post-adjustment ratio is equal to or less than a fourth threshold value. In this case, when a difference occurs between the first original BPM and the first adjusted BPM from a state in which the first original BPM and the first adjusted BPM are the same, the figure FG1 or the figure FG2 is displayed with high brightness, making it easier for the user to determine whether the first original BPM and the first adjusted BPM are the same.

[Slider display mode]
FIG. 8 is a diagram showing an example of the display content of the first display section 344A in the slider display mode.
The slider display mode is a display mode in which the first display section 344A displays the first original BPM and a graphic FG3 as a graphic corresponding to the comparison result between the first original BPM and the first adjusted BPM, as shown in Fig. 8. The graphic FG3 is a graphic corresponding to the comparison result between the first original BPM and the first adjusted BPM. More specifically, the graphic FG3 is a graphic indicating the magnitude relationship between the first original BPM and the first adjusted BPM.
The screen DP4 displayed on the first display section 344A in the slider display mode is provided with an original BPM display section DP11 and a figure display section DP41 that displays the figure FG3.

The graphic FG3 is a graphic representing a slider with a slide operator positioned within a predetermined slide range at a position corresponding to the first adjusted ratio. More specifically, the graphic FG3 includes a first reference line FG31, a second reference line FG32, a slide operator FG33, and a range display portion FG34. In other words, the graphic FG3 is a graphic that resembles a tempo slider.
The first reference line FG31 is a straight line extending in the vertical direction, and defines the sliding range of the slide operator FG33.
The second reference line FG32 extends in a direction intersecting with the first reference line FG31 at the center of the first reference line FG31. The second reference line FG32 is a scale indicating "100%."

The slide operator FG33 slides up and down along the first reference line FG31 to indicate the first post-adjustment ratio.
When the first adjusted ratio is 100%, that is, when the first original BPM and the first adjusted BPM are the same value, the display control unit 58 positions the slide operator FG33 on the second reference line FG32.
When the first adjusted BPM is smaller than the first original BPM, the display control unit 58 positions the slide operator FG33 above the second reference line FG32.
When the first adjusted BPM is greater than the first original BPM, the display control unit 58 positions the slide operator FG33 below the second reference line FG32.
In this way, the magnitude relationship between the first original BPM and the first adjusted BPM is indicated by the position of the slide operator FG33 relative to the second reference line FG32. In this respect, the graphic FG3 is a graphic that indicates the magnitude relationship between the first original BPM and the first adjusted BPM, as described above.

The range display section FG34 displays the range of the first adjusted ratio indicated by the slide operator FG33 slidably arranged on the first reference line FG31.
Here, the range of the first post-adjustment ratio indicated by the slide operator FG33 arranged on the first reference line FG31 is changed according to the first post-adjustment ratio. That is, the minimum value defined by the upper end of the first reference line FG31 and the maximum value defined by the lower end of the first reference line FG31 are changed according to the first post-adjustment ratio.

Specifically, when the first adjusted ratio is a value within the range of 94% or more and 106% or less, the display control unit 58 sets the range of the first adjusted ratio defined by the first reference line FG31 to be 94% or more and 106% or less. In this case, the minimum value defined by the upper end of the first reference line FG31 is 94%, and the maximum value defined by the lower end of the first reference line FG31 is 106%. In this case, "6%" is displayed in the range display unit FG34.

If the first post-adjustment ratio is a value within the range of 90% or more and less than 94%, or a value within the range of more than 106% and less than or equal to 110%, the display control unit 58 sets the range of the first post-adjustment ratio defined by the first reference line FG31 to a range of 90% or more and 110% or less. In this case, the minimum value defined by the upper end of the first reference line FG31 is 90%, and the maximum value defined by the lower end of the first reference line FG31 is 110%. In this case, "10%" is displayed in the range display unit FG34.

If the first adjusted ratio is a value within the range of 84% or more and less than 90%, or a value within the range of more than 110% and less than or equal to 116%, the display control unit 58 sets the range of the first adjusted ratio defined by the first reference line FG31 to a range of 84% or more and 116% or less. In this case, the minimum value defined by the upper end of the first reference line FG31 is 84%, and the maximum value defined by the lower end of the first reference line FG31 is 116%. In this case, "16%" is displayed in the range display unit FG34.

If the first post-adjustment ratio is a value within the range of 0% or more and less than 84%, or a value within the range of more than 116% and less than or equal to 200%, the display control unit 58 sets the range of the first post-adjustment ratio defined by the first reference line FG31 to a range of 0% or more and 200% or less. In this case, the minimum value defined by the upper end of the first reference line FG31 is 0%, and the maximum value defined by the lower end of the first reference line FG31 is 200%. In this case, "100%" is displayed in the range display unit FG34.
If the first post-adjustment ratio is greater than 200%, the display control unit 58 may display a graphic indicating an error in the graphic display section DP41 instead of the graphic FG3.

In this way, by checking the position of the slide operator FG33, which slides on the first reference line FG31 according to the first adjusted ratio, and the range displayed in the range display section FG34, the magnitude relationship between the first original BPM and the first adjusted BPM, as well as the first adjusted ratio, can be intuitively grasped. In other words, the information shown by the graphic FG3 is an example of information indicating the ratio of the BPM of the song after playback speed adjustment to the BPM inherent to the song.

[Effects of the First Embodiment]
The acoustic control device 1 according to the present embodiment described above provides the following effects.
The acoustic control device 1 is an acoustic control device capable of adjusting the playback speed of music pieces. The acoustic control device 1 includes a first dial 341A, a second dial 341B, and a control unit 5. The first dial 341A and the second dial 341B are rotatably mounted on the housing 2. The first dial 341A accepts an operation to adjust the playback speed of a first music piece, and the second dial 341B accepts an operation to adjust the playback speed of a second music piece. The control unit 5 includes a first adjustment unit 52 and a second adjustment unit 55. The first adjustment unit 52 changes the amount of change in the playback speed of the first music piece per unit rotation angle of the first dial 341A in accordance with the rotation state of the first dial 341A. The second adjustment unit 55 changes the amount of change in the playback speed of the second music piece per unit rotation angle of the second dial 341B in accordance with the rotation state of the second dial 341B. More specifically, the first adjustment unit 52 changes the amount of change in the BPM of the first music piece per unit rotation angle of the first dial 341A in accordance with the rotation state of the first dial 341A. The second adjustment unit 55 changes the amount of change in the BPM of the second music piece per unit rotation angle of the second dial 341B in accordance with the rotation state of the second dial 341B.

With this configuration, the amount of change in the playback speed of the music piece per unit rotation angle of the first dial 341A can be changed by changing the rotation state of the first dial 341A. That is, the amount of change can be changed by changing the way the first dial 341A is rotated. Therefore, even if the rotation angle of the first dial 341A is the same, it is possible to switch between a case where the playback speed of the first music piece is changed significantly and a case where the playback speed of the first music piece is changed slightly. Therefore, the playback speed of the first music piece can be easily adjusted without pressing the SHIFT button or the like, thereby improving the convenience of the audio control device 1. The same applies to the second dial 341B and the second adjustment unit 55.

In the acoustic control device 1, the rotation state of the first dial 341A includes the rotation speed of the first dial 341A. Similarly, the rotation state of the second dial 341B includes the rotation speed of the second dial 341B. Therefore, the first adjustment unit 52 of the control unit 5 changes the amount of change in the music playback speed per unit rotation angle of the first dial 341A in accordance with the rotation speed of the first dial 341A. The second adjustment unit 55 of the control unit 5 changes the amount of change in the music playback speed per unit rotation angle of the second dial 341B in accordance with the rotation speed of the second dial 341B.
With this configuration, by changing the rotation speed of the first dial 341A when rotating the first dial 341A, it is possible to switch between making a large change in the playback speed of the first music piece and making a fine adjustment to the playback speed of the first music piece, even if the rotation angle of the first dial 341A is the same. This makes it easy to adjust the playback speed of the first music piece with one hand, improving the convenience of the acoustic control device 1. The same applies to the second dial 341B and the second adjustment unit 55.

In the acoustic control device 1, the first adjustment unit 52 of the control unit 5 sets the amount of change in the BPM of the first music piece per unit rotation angle of the first dial 341A as a first change amount while the rotation speed of the first dial 341A is below a predetermined speed. Also, the first adjustment unit 52 of the control unit 5 sets the amount of change in the BPM of the first music piece per unit rotation angle of the first dial 341A as a second change amount that is larger than the first change amount while the rotation speed of the first dial 341A is equal to or greater than the predetermined speed. The second adjustment unit 55 of the control unit 5 operates in a similar manner.
With this configuration, the amount of change in the BPM of the first music piece per unit rotation angle of the first dial 341A can be switched between a first change amount and a second change amount depending on the rotation speed of the first dial 341A. This makes it easy to switch between operating the first dial 341A to make large changes to the BPM and playback speed of the first music piece and operating the first dial 341A to make small changes. It also makes it easier for the user to grasp the adjusted BPM and playback speed of the music piece. This allows the playback speed of the first music piece to be easily adjusted, improving the convenience of the audio control device 1. The second adjustment unit 55 can also achieve a similar effect.

The acoustic control device 1 includes a first detector 342A that detects the rotational acceleration of the first dial 341A and a second detector 342B that detects the rotational acceleration of the second dial 341B. A first adjuster 52 of the controller 5 calculates the rotational speed of the first dial 341A based on the rotational acceleration of the first dial 341A detected by the first detector 342A. A second adjuster 55 of the controller 5 calculates the rotational speed of the second dial 341B based on the rotational acceleration of the second dial 341B detected by the second detector 342B.
With this configuration, it is possible to more quickly determine whether the rotation speed of the first dial 341A is less than the predetermined speed or greater than the predetermined speed, compared to when the rotation speed is calculated based on the rotation angle and rotation time of the first dial 341A. Therefore, the amount of change in the playback speed of the music piece per unit rotation angle of the first dial 341A can be quickly determined, making it easier to adjust the playback speed of the first music piece to correspond to the rotation operation of the first dial 341A. This makes it easier to link the rotation angle of the first dial 341A with the adjustment amount of the playback speed of the first music piece, further improving the operability of the first dial 341A and the convenience of the sound control device 1. Similar effects can also be achieved by the second detection unit 342B and the second adjustment unit 55.

In the acoustic control device 1, when the first dial 341A is rotated clockwise, the first adjustment unit 52 of the control unit 5 increases the BPM of the first music piece, thereby increasing the playback speed of the first music piece. When the first dial 341A is rotated counterclockwise, the first adjustment unit 52 of the control unit 5 decreases the BPM of the first music piece, thereby decreasing the playback speed of the first music piece. Clockwise rotation corresponds to the first rotation direction, and counterclockwise rotation corresponds to the direction opposite to the first rotation direction. The same is true for the second adjustment unit 55B of the control unit 5.
With this configuration, the playback speed of the first music piece can be increased or decreased depending on the rotation direction of the first dial 341A. This makes it easier to adjust the playback speed of the first music piece, thereby improving the convenience of the acoustic control device 1. The second adjustment unit 55 can also achieve the same effect.

The acoustic control device 1 includes a housing 2 in which a first dial 341A is rotatably provided on a top surface 21. As described above, the first rotation direction is a clockwise direction when viewed from a position facing the top surface 21. The top surface 21 corresponds to the first surface.
Generally, the dial is rotated clockwise to increase the numerical value of a predetermined index, and counterclockwise to decrease the numerical value.
In contrast, by rotating the first dial 341A clockwise, the playback speed of the first music piece can be increased, and by rotating the first dial 341A counterclockwise, the playback speed of the first music piece can be decreased. This makes it easier for the user to understand the direction in which to operate the first dial when increasing or decreasing the playback speed of the first music piece, making it easier to adjust the playback speed of the first music piece. The same is true for the second dial 341B rotatably provided on the top surface 21.

The acoustic control device 1 includes a first notification unit 343A and a second notification unit 343B. When the ratio of the BPM of the first song after playback speed adjustment to the BPM specific to the first song reaches one of a first limit value and a second limit value, the first notification unit 343A notifies the user that the ratio has reached the one limit value. The same is true for the second notification unit 343B. In other words, the first notification unit 343A and the second notification unit 343B correspond to notification units, and the first limit value and the second limit value correspond to predetermined values.
With this configuration, even while the user is rotating the dial, the user can know when the ratio has reached the first limit value or the second limit value, thereby improving the convenience of the acoustic control device 1.

In the acoustic control device 1, when the first dial 341A is rotated and the ratio of the BPM of the first music piece after the playback speed adjustment to the BPM specific to the first music piece reaches a predetermined value, the first notification unit 343A restricts rotation of the first dial 341A in the direction in which the first dial 341A was rotated. That is, when the first dial 341A is rotated in one of the clockwise and counterclockwise directions and the ratio of the BPM of the first music piece after the playback speed adjustment to the BPM specific to the first music piece reaches a predetermined value, the first notification unit 343A restricts rotation of the first dial 341A in the one direction. In this way, the first notification unit 343A notifies the user that the first adjusted ratio has reached a first limit value or a second limit value. The same applies to the second notification unit 343B.
This configuration makes it easier for the user to know when the ratio has reached the first limit value or the second limit value, thereby further improving the convenience of the sound control device 1.

The acoustic control device 1 includes a first display unit 344A and a second display unit 344B. The first display unit 344A displays information relating to the playback speed of the first music piece adjusted by the control unit 5. The second display unit 344B displays information relating to the playback speed of the second music piece adjusted by the control unit 5.
With this configuration, it is possible to easily adjust the playback speed of the first music piece and the second music piece by checking the display contents on the first display section 344A and the second display section 344B.

In the acoustic control device 1, the first display unit 344A displays information indicating the ratio of the BPM of the first music piece after the playback speed adjustment to the BPM inherent to the first music piece, as information regarding the playback speed of the first music piece adjusted by the first adjustment unit 52 of the control unit 5. In other words, the first display unit 344A displays information indicating the first adjusted ratio, which is the ratio of the first adjusted BPM to the first original BPM, as information regarding the playback speed of the first music piece after the playback speed adjustment. The same is true for the second display unit 344B.
With this configuration, the user can intuitively grasp how much the current first adjusted BPM has been adjusted relative to the first original BPM. This makes it easier to adjust the playback speed of the first music piece. The same effect can be achieved with the second display unit 344B.

[Modification of the first embodiment]
In the above-described acoustic control device 1, when the display mode is the graphic display mode, the brightness of the graphics FG1 and FG2 is changed in accordance with the first post-adjustment ratio. However, this is not limiting, and at least one of the brightness, color, and blinking cycle of the graphics FG1 and FG2 may be changed in accordance with the first post-adjustment ratio.

FIG. 9 is a diagram illustrating the relationship between the first adjusted ratio and the graphics FG1 and FG2 displayed when the display mode is the graphics display mode.
For example, when the display mode is the graphics display mode, graphics FG1 and FG2 may be displayed as shown in FIG.
That is, when the first post-adjustment ratio is greater than 100% and less than a first threshold (e.g., 110%), the display control unit 58 changes the color of the figure FG1 to red. When the first post-adjustment ratio is equal to or greater than the first threshold and less than a second threshold (e.g., 120%), the display control unit 58 changes the color of the figure FG1 to orange. When the first post-adjustment ratio is equal to or greater than the second threshold, the display control unit 58 changes the color of the figure FG1 to yellow.

Furthermore, if the first post-adjustment ratio is greater than a third threshold (e.g., 90%) but less than 100%, the display control unit 58 changes the color of the figure FG2 to blue-green. If the first post-adjustment ratio is equal to or less than the third threshold and greater than a fourth threshold (e.g., 80%), the display control unit 58 changes the color of the figure FG2 to blue. If the first post-adjustment ratio is equal to or less than the fourth threshold, the display control unit 58 changes the color of the figure FG2 to blue-purple.
If the first adjusted BPM is the same as the first original BPM, the graphics FG1 and FG2 are not displayed, as in the above.

In this way, in the sound control device 1, the colors of the graphics FG1 and FG2 may differ depending on the post-adjustment ratio.
With this configuration, the adjusted ratio can be easily grasped by checking the colors of the graphics FG1 and FG2.
Furthermore, when the adjusted ratio exceeds 100%, the color of the figure FG1 is made warm, and when the adjusted ratio is less than 100%, the color of the figure FG2 is made cool, so that the user can more intuitively grasp the relationship in magnitude between the original BPM and the adjusted BPM.
The relationship between the adjusted ratio and the color of the graphics FG1 and FG2 is not limited to the above, and the colors of the graphics FG1 and FG2 may be other colors.

FIG. 10 is a diagram for explaining the relationship between the adjusted ratio and the graphics FG1 and FG2 to be displayed when the display mode is the graphics display mode.
For example, when the display mode is the graphics display mode, graphics FG1 and FG2 may be displayed as shown in FIG.
That is, when the post-adjustment ratio is greater than 100% and less than a first threshold (e.g., 110%), the display control unit 58 sets the blinking cycle of the figure FG1 to a large value. When the post-adjustment ratio is equal to or greater than the first threshold and less than a second threshold (e.g., 120%), the display control unit 58 sets the blinking cycle of the figure FG1 to a smaller value than the blinking cycle when the post-adjustment ratio is greater than 100% and less than the first threshold. When the post-adjustment ratio is equal to or greater than the second threshold, the display control unit 58 sets the blinking cycle of the figure FG1 to the smallest value. Note that a large blinking cycle indicates a low blinking frequency and a low blinking frequency, and a small blinking cycle indicates a high blinking frequency and a high blinking frequency.

Furthermore, when the post-adjustment ratio is greater than a third threshold (e.g., 90%) and less than 100%, the display control unit 58 increases the blinking period of the graphic FG2. When the post-adjustment ratio is equal to or less than the third threshold and greater than a fourth threshold (e.g., 80%), the display control unit 58 decreases the blinking period of the graphic FG2 compared to when the post-adjustment ratio is greater than the third threshold and less than 100%. When the post-adjustment ratio is equal to or less than the fourth threshold, the display control unit 58 decreases the blinking period of the graphic FG2 to its smallest value.
In this way, as the difference between the original BPM and the adjusted BPM increases, the blinking cycle of the figures FG1 and FG2 decreases and the blinking frequency of the figures FG1 and FG2 increases. In other words, as the difference between the original BPM and the adjusted BPM decreases, the blinking cycle of the figures FG1 and FG2 increases and the blinking frequency of the figures FG1 and FG2 decreases.
If the adjusted BPM is the same as the original BPM, the graphics FG1 and FG2 are not displayed, as in the above.

In this way, in the sound control device 1, the blinking cycles of the graphics FG1 and FG2 may differ depending on the adjusted ratio.
With this configuration, the adjusted ratio can be easily grasped by checking the blinking cycle of the graphics FG1 and FG2.
Furthermore, as the difference between the original BPM and the adjusted BPM becomes smaller and the adjusted ratio approaches 100%, the blinking cycle of the figures FG1 and FG2 becomes larger, thereby making it easier for the user to grasp the adjusted ratio. In other words, as the difference between the original BPM and the adjusted BPM becomes larger and the adjusted ratio moves away from 100%, the blinking cycle of the figures FG1 and FG2 becomes smaller, thereby making it easier for the user to grasp the adjusted ratio.

The relationship between the adjusted ratio and the blinking cycle of the figures FG1 and FG2 is not limited to the above. For example, the blinking cycle of the figures FG1 and FG2 may be decreased as the adjusted ratio approaches 100%. In other words, the blinking cycle of the figures FG1 and FG2 may be decreased to increase the blinking frequency of the figures FG1 and FG2 as the difference between the original BPM and the adjusted BPM decreases. Furthermore, the blinking cycle of the figures FG1 and FG2 may be increased to decrease the blinking frequency of the figures FG1 and FG2 as the difference between the original BPM and the adjusted BPM increases. Note that when the original BPM and the adjusted BPM match, the figures FG1 and FG2 are turned off instead of being lit.
With this configuration, the user can easily understand that the original BPM and the adjusted BPM match by checking that the figures FG1 and FG2, which were flashing at a high flashing frequency, are now turned off.

Second Embodiment
Next, a second embodiment of the present invention will be described.
The sound control device according to this embodiment has the same configuration as the sound control device 1 according to the first embodiment, but differs in that a display unit that shows the ratio of the adjusted BPM to the original BPM is provided on the dial. In the following explanation, parts that are the same or approximately the same as parts that have already been explained will be assigned the same reference numerals and explanations thereof will be omitted.

[General configuration of the acoustic control device]
FIG. 11 is a schematic diagram showing a dial 346 provided in the acoustic control device according to this embodiment.
The acoustic control device according to this embodiment has the same configuration and functions as the acoustic control device 1 according to the first embodiment, except that it has a dial 346 and a ratio display unit 347 shown in Fig. 11 instead of the dial 341 according to the first embodiment. That is, in this embodiment, the playback speed operation unit 34 has a dial 346, a detection unit 342, a notification unit 343, a display unit 344, a switching operation unit 345, and a ratio display unit 347.

[Dial Configuration]
The dial 346, like the dial 341, is rotatable clockwise and counterclockwise when viewed from a position facing the top surface 21, and accepts an operation to adjust the playback speed of music. The dial 346 is provided with a ratio display section 347.

[Configuration of the ratio display section]
The ratio display unit 347 displays the adjusted ratio under the control of the display control unit 58. The ratio display unit 347 is made up of a plurality of light-emitting elements 348 arranged along the direction in which the dial 346 rotates.
The ratio display section 347 has a first area 347A which is an area extending halfway around the dial 346 in a clockwise direction from a base point BP, and a second area 347B which is an area extending halfway around the dial 346 in a counterclockwise direction from the base point BP.
The first area 347A is an area for displaying the adjusted ratio when the adjusted BPM is greater than the original BPM. More specifically, the first area 347A is an area for displaying the adjusted ratio when the adjusted ratio is greater than 100% and less than 200%.
The second area 347B is an area for displaying the adjusted ratio when the adjusted BPM is smaller than the original BPM. More specifically, the second area 347B is an area for displaying the adjusted ratio when the adjusted ratio is greater than 0% and less than 100%.
The base point BP is set at the intersection of the virtual line VL extending upward from the rotation axis Rx of the dial 346 and the circumferential direction centered on the rotation axis Rx of the dial 346. As described above, the dial 346 is rotatable around the rotation axis Rx, and therefore the position of the base point BP is constantly updated by the display control unit 58 whenever the dial 346 is rotated.

[Functions of the ratio display section]
Fig. 12 is a diagram showing an example of the display mode of the ratio display section 347. Specifically, Fig. 12 is a diagram showing the ratio display section 347 when the adjusted ratio is 130%.
The display control unit 58 lights up a number of light-emitting elements 348 corresponding to the adjusted ratio out of the plurality of light-emitting elements 348 included in the ratio display unit 347, thereby displaying the adjusted ratio on the ratio display unit 347. In detail, when the adjusted BPM is larger than the original BPM, the display control unit 58 lights up a number of light-emitting elements 348 corresponding to the difference between 100% and the adjusted ratio out of the plurality of light-emitting elements 348 arranged in the first region 347A, starting from the base point BP, thereby displaying the adjusted ratio.
For example, if the adjusted ratio is 130%, the display control unit 58 displays the adjusted ratio on the ratio display unit 347 by lighting up, from the base point BP, a number of light-emitting elements 348 out of the plurality of light-emitting elements 348 arranged in the first area 347A, corresponding to 30%, which is the difference between 100% and the adjusted ratio, as shown in FIG. 12 .

Fig. 13 is a diagram showing an example of the display mode of the ratio display section 347. Specifically, Fig. 13 is a diagram showing the ratio display section 347 when the adjusted ratio is 80%.
Furthermore, when the adjusted BPM is smaller than the original BPM, the display control unit 58 displays the adjusted ratio by lighting up, from the base point BP, a number of light-emitting elements 348 out of the plurality of light-emitting elements 348 arranged in the second region 347B that corresponds to the difference between 100% and the adjusted ratio.
For example, if the adjusted ratio is 80%, the display control unit 58 displays the adjusted ratio on the ratio display unit 347 by lighting up, from the base point BP, a number of light-emitting elements 348 arranged in the second region 347B that corresponds to 20%, which is the difference between 100% and the adjusted ratio, as shown in Figure 13.

In this way, by displaying the adjusted ratio in either the first clockwise region 347A or the second counterclockwise region 347B centered on the base point BP, the user can intuitively grasp the adjusted ratio.
The light emitting elements 348 arranged in the first region 347A may emit light in different colors from the light emitting elements 348 arranged in the second region 347B. For example, the light emitting elements 348 that are turned on when the adjusted BPM is higher than the original BPM may emit red light, which is a warm color, and the light emitting elements 348 that are turned on when the adjusted BPM is lower than the original BPM may emit blue light, which is a cool color. Furthermore, the light emitting elements 348 may flash at a frequency corresponding to the adjusted ratio, as in the modification of the first embodiment.
The acoustic control device according to this embodiment described above has the same effects as the acoustic control device 1 according to the first embodiment.

[Modification of the second embodiment]
FIG. 14 shows another arrangement of the ratio display section 347.
The ratio display unit 347 described above is provided on the dial 346. However, the present invention is not limited to this and may be provided in other locations.
For example, as shown in FIG. 14, a plurality of light emitting elements 348 constituting a ratio display unit 347 may be provided around a dial 341 on the top surface 21 of the housing 2 .
With this configuration, the plurality of light-emitting elements 348 are fixed to the housing 2, so the base point BP can be fixed. This makes it easier to grasp the first region 347A clockwise from the base point BP and the second region 347B counterclockwise from the base point BP. Therefore, the magnitude relationship between the original BPM and the adjusted BPM can be easily grasped, and the adjusted ratio can be grasped by checking the range of arrangement of the light-emitting elements 348 that are turned on.
In addition, since the base point BP can be fixed, the process of calculating the position of the base point BP on the rotating dial 346 can be omitted.

[Modification of the embodiment]
The present invention is not limited to the above-described embodiments, and any modifications and improvements that can achieve the object of the present invention are included in the present invention.

FIG. 15 is a schematic diagram showing an acoustic control device 1A, which is a modification of the acoustic control device 1. As shown in FIG.
In each of the above embodiments, a playback speed operation unit 34 is provided for each channel operation unit 3. However, this is not limited to this, and a single playback speed operation unit 34 may be provided for the entire audio control device, as in the audio control device 1A shown in FIG. 15 . In this case, the control unit 5 simultaneously adjusts the playback speeds of the music on all channels in response to operations on the playback speed operation unit 34. In this case, the control unit 5 may increase or decrease the BPM of the music on all channels during playback by the same amount, or may increase or decrease the BPM of the music on all channels during playback by the same rate, in response to the rotation state of the single playback speed operation unit 34. When such playback speed operation units 34 are provided, the first channel operation unit 3A may be provided with a tempo slider 35 that can adjust only the playback speed of the music on the first channel, and the second channel operation unit 3B may be provided with a tempo slider 35 that can adjust only the playback speed of the music on the second channel.

In the above embodiments, the rotational states of the dials 341 and 346 include the rotational speeds of the dials 341 and 346. That is, the control unit 5 changes the amount of change in the BPM of the music per unit rotation angle of the dials 341 and 346 in accordance with the rotational speed of the dials 341 and 346, thereby changing the amount of change in the playback speed of the music per unit rotation angle. However, this is not limiting, and the rotational states of the dials 341 and 346 do not necessarily have to include the rotational speeds of the dials 341 and 346. The control unit 5 may change the amount of change in the BPM of the music per unit rotation angle of the dials 341 and 346 in accordance with the rotational states of the dials 341 and 346, thereby changing the amount of change in the playback speed of the music per unit rotation angle. For example, when a predetermined rotation operation is performed on the dials 341 and 346, the amount of change in the BPM of the music per unit rotation angle and the amount of change in the playback speed of the music per unit rotation angle may be changed. In this case, when the dials 341, 346 are rotated a predetermined angle in one of the clockwise and counterclockwise directions, rotated a predetermined angle in the other direction, and then further rotated in the one direction, the control unit 5 may change the amount of change in the BPM of the music per unit rotation angle of the dials 341, 346 in the subsequent one direction from a first amount of change to a second amount of change, thereby changing the amount of change in the playback speed of the music per unit rotation angle. In this case, the control unit 5 may also change the amount of change in the BPM of the music per unit rotation angle of the dials 341, 346 and the amount of change in the playback speed of the music per unit rotation angle between when the dials 341, 346 are rotated without being pressed toward the housing 2 and when the dials 341, 346 are rotated while being pressed toward the housing 2. In addition, the control unit 5 may change the amount of change in the BPM of the music per unit rotation angle of the dials 341, 346 and the amount of change in the playback speed of the music per unit rotation angle depending on whether the pressure applied to the dials 341, 346 in the direction toward the housing 2 is less than a predetermined value or greater than a predetermined value.

In each of the above embodiments, the control unit 5 sets the amount of change in the BPM of the music per unit rotation angle of the dials 341, 346 as a first change amount while the rotation speed of the dials 341, 346 is below a predetermined speed, and sets the amount of change in the BPM of the music per unit rotation angle of the dials 341, 346 as a second change amount greater than the first change amount while the rotation speed of the dials 341, 346 is equal to or greater than the predetermined speed. However, the present invention is not limited to this, and the second change amount may be a change amount smaller than the first change amount.

In the above embodiments, the acoustic control device 1, 1A is equipped with a detection unit 342 that detects the rotational acceleration of the dials 341, 346. The control unit 5 calculates the rotational speed of the dials 341, 346 based on the rotational acceleration of the dials 341, 346 detected by the detection unit 342. However, this is not limiting, and the rotational speed of the dials 341, 346 may be calculated based on the rotation time and rotation angle of the dials 341, 346.

In each of the above embodiments, the control unit 5 increases the BPM and playback speed of the music when the dials 341, 346 are rotated clockwise as a first rotation direction, and decreases the BPM and playback speed of the music when the dials 341, 346 are rotated counterclockwise, which is the opposite direction to the first rotation direction. However, this is not limited to this. The control unit 5 may increase the BPM and playback speed of the music when the dials 341, 346 are rotated counterclockwise, and decrease the BPM and playback speed of the music when the dials 341, 346 are rotated clockwise. Alternatively, the control unit 5 may increase or decrease the BPM and playback speed of the music only when the dials 341, 346 are rotated clockwise or counterclockwise.

In the above embodiments, the sound control device 1, 1A is provided with a notification unit 343 that notifies the user that the ratio of the BPM of a song after adjusting its playback speed to the BPM inherent to the song has reached a predetermined value. However, the sound control device 1, 1A does not necessarily have to be provided with the notification unit 343.

In the above embodiments, when the dials 341, 346 are rotated in one of the clockwise and counterclockwise directions and the ratio of the BPM of the music after the playback speed adjustment to the BPM inherent to the music reaches a predetermined value, the notification unit 343 notifies the user that the ratio has reached the predetermined value by restricting the rotation of the dials 341, 346 in the one direction. However, the notification is not limited to this, and may be made by other methods as described above.

In the above embodiments, the acoustic control device 1, 1A is provided with a display unit 344 that displays information about the playback speed of the music adjusted by the control unit 5. However, the acoustic control device 1, 1A does not necessarily have to be provided with the display unit 344.
Furthermore, the playback speed operation units 34A and 34B each have a separate display unit 344. However, this is not limiting, and the acoustic control apparatuses 1 and 1A may each have a common display unit for the playback speed operation units 34A and 34B.

In the above embodiments, the display unit 344 displays information indicating the ratio of the BPM of the song after the playback speed adjustment to the BPM inherent to the song, as information regarding the playback speed of the song adjusted by the control unit 5. However, this is not limiting, and the display unit 344 may display other information. For example, as in the direct display mode, the display unit 344 may display the original BPM and the adjusted BPM.

In the above embodiments, the graphic FG1 is an upward-facing triangle, and the graphic FG2 is a downward-facing triangle. However, this is not a limitation, and one of the graphics FG1 and FG2 may be a right-facing triangle and the other a left-facing triangle. Furthermore, the graphics FG1 and FG2 may point in opposite directions, for example, arrows or other polygonal shapes. In other words, the graphic displayed on the display unit 344 by the display control unit 58 may be any shape or size as long as it corresponds to the comparison result between the original BPM and the adjusted BPM.

In the above embodiments, the brightness of the figures FG1 and FG2 varies depending on the ratio of the adjusted BPM to the original BPM (adjusted ratio). However, this is not limiting, and the brightness of the figures FG1 and FG2 may be constant regardless of the adjusted ratio. Similarly, the color and blinking cycle of the figures FG1 and FG2 may also be constant regardless of the adjusted ratio. Furthermore, the figures may be displayed by combining at least two of the brightness, color, and blinking cycle.

In the above-described embodiments, the range of the adjusted ratio indicated by the first reference line FG31 that defines the range within which the slide operator FG33 can slide with respect to the graphic FG3 varies depending on the adjusted ratio. However, this is not limiting, and the range of the adjusted ratio indicated by the slide range may be constant.

In the above embodiments, the acoustic control device 1, 1A is provided with a display unit 344 on which figures FG1, FG2, FG3, etc. are displayed. However, this is not limiting, and the display unit 344 does not necessarily have to be provided. For example, even if the acoustic control device itself does not have a display unit, an external device connected to the acoustic control device may have a display unit that displays figures, etc.

In the second embodiment, the light emitting elements 348 constituting the ratio display unit 347 are provided around the entire circumference of the dial 346 in the rotation direction of the dial 346. However, the present invention is not limited to this, and the range in which the light emitting elements 348 are provided can be changed as appropriate. The same applies to the case in which the light emitting elements 348 are provided around the periphery of the dial 346.

In the second embodiment, the plurality of light-emitting elements 348 provided in the first region 347A, which is a region clockwise from the base point BP, display the adjusted ratio when the adjusted BPM is greater than the original BPM. Also, the plurality of light-emitting elements 348 provided in the second region 347B, which is a region counterclockwise from the base point BP, display the adjusted ratio when the adjusted BPM is smaller than the original BPM. However, this is not limiting, and the plurality of light-emitting elements 348 provided in the first region 347A may display the adjusted ratio when the adjusted BPM is smaller than the original BPM. Similarly, the plurality of light-emitting elements 348 provided in the second region 347B may display the adjusted ratio when the adjusted BPM is greater than the original BPM.
Furthermore, the configuration in which the ratio display unit 347 is provided is not limited to the dial 346 and the housing 2, and can be changed as appropriate.

In the above embodiments, the display modes of the display unit 344 provided in each channel operation unit 3 include a direct display mode, a ratio display mode, a graphic display mode, and a slider display mode. However, the acoustic control device does not necessarily have to be configured to be able to set all of these display modes. For example, the acoustic control device may have at least one of the graphic display mode and the slider display mode as a switchable display mode.

In the above embodiments, the audio control device 1 or 1A is a mixer. However, the audio control device of the present disclosure is not limited to this and may be another audio device such as a DJ controller or another electronic device.
Furthermore, the configuration and layout of the acoustic control devices 1 and 1A, which are mixers, are not limited to those shown in FIGS. 1 and 15, and can be modified as appropriate.

[Summary of the present invention]
The present invention will be summarized below.
[1] An audio control device capable of adjusting the playback speed of a piece of music, comprising: a rotatable dial that accepts operations to adjust the playback speed of the piece of music; and a control unit that changes the amount of change in the playback speed of the piece of music per unit rotation angle of the dial depending on the rotation state of the dial.
With this configuration, the amount of change in the music playback speed per unit rotation angle of the dial can be changed by changing the rotation state of the dial. In other words, the amount of change can be changed by changing the way the dial is rotated. Therefore, even if the rotation angle of the dial is the same, it is possible to switch between a case where the music playback speed is changed significantly and a case where the music playback speed is changed slightly. Therefore, the music playback speed can be easily adjusted without pressing the SHIFT button or the like, thereby improving the convenience of the audio control device.

[2] In the acoustic control device described in [1], the rotation state of the dial may include a rotation speed of the dial.
With this configuration, by changing the rotation speed of the dial when rotating the dial, it is possible to switch between making large changes to the playback speed of music and making fine adjustments to the playback speed of music, even if the rotation angle of the dial is the same. This makes it easy to adjust the playback speed of music with one hand, improving the convenience of the audio control device.

[3] In the acoustic control device described in [2], the control unit may set the amount of change in the BPM of the song per unit rotation angle of the dial to a first change amount while the rotation speed of the dial is less than a predetermined speed, and may set the amount of change in the BPM of the song per unit rotation angle of the dial to a second change amount greater than the first change amount while the rotation speed of the dial is equal to or greater than the predetermined speed.
With this configuration, the amount of change in the BPM of the music per unit rotation angle of the dial can be switched between a first change amount and a second change amount depending on the rotation speed of the dial. This makes it easy to switch between dial operations that result in large changes to the BPM and playback speed of the music and small changes to the playback speed of the music, and also makes it easier for the user to grasp the adjusted BPM and playback speed of the music. This makes it easy to adjust the playback speed of the music, improving the convenience of the audio control device.

[4] In the acoustic control device described in [2] or [3], a detection unit may be provided that detects the rotational acceleration of the dial, and the control unit may calculate the rotational speed of the dial based on the rotational acceleration of the dial detected by the detection unit.
With this configuration, it is possible to quickly determine whether the rotation speed of the dial is less than the predetermined speed or greater than the predetermined speed, compared to when the rotation speed is calculated based on the rotation angle and rotation time of the dial. This allows the amount of change in the playback speed of the music per unit rotation angle of the dial to be quickly determined, making it easier to adjust the playback speed of the music according to the rotation of the dial. This makes it easier to link the rotation angle of the dial with the amount of adjustment of the playback speed of the music, further improving the feel of operating the dial and the convenience of the audio control device.

[5] In the acoustic control device described in any one of [1] to [4], the control unit may increase the playback speed of the music when the dial is rotated in a first rotation direction, and decrease the playback speed of the music when the dial is rotated in a direction opposite to the first rotation direction.
With this configuration, the playback speed of the music can be increased or decreased depending on the direction of rotation of the dial, making it easier to adjust the playback speed of the music and improving the usability of the audio control device.

[6] In the acoustic control device described in [5], the housing has the dial rotatably mounted on a first surface, and the first rotation direction may be a clockwise direction when viewed from a position facing the first surface.
Generally, the dial is rotated clockwise to increase the numerical value of a predetermined index, and counterclockwise to decrease the numerical value.
In contrast, with the above configuration, the playback speed of a song can be increased by rotating the dial clockwise, and decreased by rotating the dial counterclockwise. This makes it easier for the user to understand the direction in which to turn the dial to increase or decrease the playback speed of a song, making it easier for the user to adjust the playback speed of a song.

[7] In the acoustic control device described in any one of [1] to [6], a notification unit may be provided that notifies the user that, when the ratio of the BPM of the song after adjusting the playback speed to the BPM specific to the song reaches a predetermined value, the ratio has reached the predetermined value.
With this configuration, even when the user is rotating the dial, the user can know that the ratio has reached the predetermined value, thereby improving the convenience of the sound control device.

[8] In the acoustic control device described in [7], when the dial is rotated and the ratio reaches the predetermined value, the notification unit may notify that the ratio has reached the predetermined value by regulating rotation of the dial in the direction in which the dial was rotated.
This configuration allows the user to easily understand that the ratio has reached the predetermined value, thereby further improving the convenience of the sound control device.

[9] The acoustic control device according to any one of [1] to [8] may further include a display unit that displays information about the playback speed of the music piece adjusted by the control unit.
With this configuration, it is possible to easily adjust the playback speed of the music by checking the content displayed on the display unit.

[10] In the acoustic control device described in [9], the display unit may display information indicating the ratio of the BPM of the song after playback speed adjustment to the BPM inherent to the song, as information regarding the playback speed of the song adjusted by the control unit.
This configuration allows the user to intuitively grasp the degree to which the playback speed has been adjusted relative to the playback speed inherent to the song, making it easier to adjust the playback speed of the song.

1, 1A...acoustic control device, 2...housing, 21...top surface (first surface), 341, 346...dial, 341A...first dial, 341B...second dial, 342...detection unit, 342A...first detection unit, 342B...second detection unit, 343...notification unit, 343A...first notification unit, 343B...second notification unit, 344...display unit, 344A...first display unit, 344B...second display unit, 345...switching operation unit, 345A...first switching operation unit, 345B...second switching operation unit, 5...control unit.

Claims (10)

An audio control device capable of adjusting the playback speed of music,
a rotatable dial that receives an operation to adjust the playback speed of the music;
a control unit that changes the amount of change in the playback speed of the music per unit rotation angle of the dial in accordance with the rotation state of the dial;
and a notification unit that notifies the user that, when the ratio of the BPM of the song after playback speed adjustment to the BPM specific to the song reaches a predetermined value, the ratio has reached the predetermined value . 2. The acoustic control device according to claim 1 ,
The notification unit notifies the user that the ratio has reached the predetermined value by restricting the rotation of the dial in the direction in which the dial was rotated when the dial is rotated and the ratio has reached the predetermined value. 3. The acoustic control device according to claim 1,
The acoustic control device, wherein the rotation state of the dial includes the rotation speed of the dial. 4. The acoustic control device according to claim 3,
a detection unit for detecting rotational acceleration of the dial,
The control unit calculates the rotation speed of the dial based on the rotation acceleration of the dial detected by the detection unit. An audio control device capable of adjusting the playback speed of music,
a rotatable dial that receives an operation to adjust the playback speed of the music;
a detection unit that detects the rotation acceleration of the dial;
a control unit that changes the amount of change in the playback speed of the music per unit rotation angle of the dial in accordance with the rotation state of the dial ,
the rotation state of the dial includes a rotation speed of the dial;
The control unit calculates the rotation speed of the dial based on the rotation acceleration of the dial detected by the detection unit . The acoustic control device according to any one of claims 3 to 5 ,
The control unit
While the rotation speed of the dial is less than a predetermined speed, a change amount of the BPM of the music piece per unit rotation angle of the dial is set to a first change amount;
An acoustic control device characterized in that, while the rotation speed of the dial is equal to or greater than the predetermined speed, the change in BPM of the music per unit rotation angle of the dial is set to a second change amount that is greater than the first change amount. 7. The acoustic control device according to claim 1 ,
The control unit
When the dial is rotated in a first direction, the playback speed of the music increases;
An audio control device, characterized in that when the dial is rotated in a direction opposite to the first rotation direction, the playback speed of the music piece is decreased. 8. The acoustic control device according to claim 7 ,
a housing having the dial rotatably mounted on a first surface thereof;
The acoustic control device, wherein the first rotation direction is a clockwise direction when viewed from a position facing the first surface. The acoustic control device according to any one of claims 1 to 8,
An acoustic control device comprising: a display unit that displays information about the playback speed of the music piece adjusted by the control unit. 10. The acoustic control device according to claim 9,
The display unit displays information indicating the ratio of the BPM of the song after the playback speed adjustment to the BPM inherent to the song as information regarding the playback speed of the song adjusted by the control unit.