JP4125559B2 - Electronic tuner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic tuner that notifies whether or not the difference between a pitch of an input musical tone signal and a predetermined reference pitch is within a predetermined range.
[0002]
[Prior art]
When tuning a stringed instrument such as a guitar, the pitch of the musical tone signal input by the stringed string is detected, and the detected pitch (hereinafter referred to as the detected pitch) is set in advance. An electronic tuner (tuner) is used to notify whether or not the difference from the reference pitch being set is within a predetermined range. Such an electronic tuner includes a meter having a pointer indicating the difference between the detected pitch and the reference pitch, an LED that is lit when the difference is within a predetermined range, and the like. The operator tunes so that the pointer of the meter is within a predetermined range or the LED is lit.
[0003]
[Problems to be solved by the invention]
In the electronic tuner described above, the notification as to whether or not the difference between the detected pitch and the reference pitch is within a predetermined range is whether the meter pointer is within the predetermined range or whether the LED is lit. Is done. However, in a stringed instrument such as a guitar, even if the pitch of the musical tone signal is within a predetermined range, the waveform of the musical tone signal fluctuates, so the meter pointer vibrates or the LED blinks. In such a case, there is a problem that beginners do not know well whether the tuning has been performed reliably.
[0004]
In view of the above circumstances, an object of the present invention is to provide an electronic tuner capable of recognizing that tuning has been performed reliably.
[0005]
[Means for Solving the Problems]
The electronic tuning device of the present invention that achieves the above object is an electronic tuning device that notifies whether or not the difference between the pitch of the input musical tone signal and a predetermined reference pitch is within a predetermined range.
First informing means for informing when the difference falls within the predetermined range;
And a second informing means for informing when the difference is within the predetermined range for a predetermined time.
[0006]
In general, when tuning a stringed instrument such as a guitar with an electronic tuner, even if the pitch of a musical signal input to the electronic musical instrument is within a predetermined range, the waveform of the musical signal varies. For this reason, the pointer of the meter may vibrate or the LED blinks. In such a case, there is a problem that a beginner cannot know whether tuning has been performed reliably.
[0007]
The electronic tuning device according to the present invention provides the second notification even when the pointer of the meter as the first notification means vibrates or the LED blinks when tuning a guitar or the like. This is notified when the difference between the pitch of the input musical sound signal and the predetermined reference pitch is within a predetermined range for a predetermined time by means (for example, a speaker in an embodiment described later). Therefore, even a beginner can recognize that tuning has been performed reliably.
Here, in the electronic tuner of the present invention, the first notification means may be visual notification means for performing visual notification, or the second notification means may be provided for auditory notification for performing auditory notification. It may be a means. In this case, the visual notification means may be a meter that notifies by movement of a pointer, or the visual notification means may be a light emitting means that notifies in a light emitting state of a light emitter. Further, the auditory alerting means may be a sounding means for alerting and notifying.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0009]
FIG. 1 is a block diagram of an electronic tuner according to an embodiment of the present invention.
[0010]
An acoustic signal A (an example of a musical tone signal according to the present invention) is input to the electronic tuner 100 shown in FIG. The electronic tuner 100 is an electronic tuner that notifies whether or not the difference between the pitch of the input acoustic signal A and a predetermined reference pitch is within a predetermined range.
[0011]
The electronic tuner 100 includes a zero-cross detection unit 102, an operator group 103, a CPU 104, a display unit 105, a sound emitting unit 106, a ROM 107, and a RAM 108.
[0012]
The zero-cross detection unit 102 performs zero-cross detection on the input acoustic signal A, and outputs an interrupt signal to the CPU 104 when the zero-cross is detected.
[0013]
The operation element group 103 includes operation elements such as a reference pitch selection switch, a time button, and a range button. These operators will be described later.
[0014]
The CPU 104 controls the entire electronic tuner 100 shown in FIG. 1 by a program stored in the ROM 107. Specifically, a pitch that is a fundamental frequency is detected based on the autocorrelation based on the interrupt signal output from the above-described zero cross detection unit 102, or an operation state of the operation elements provided in the operation element group 103 is detected. Or control display on the display unit 106, drive control of a speaker provided in the sound emitting unit 106, which will be described later, and the like.
[0015]
The display unit 105 is an example of a first notification unit according to the present invention, and the display unit 105 includes a difference between a pitch of the input acoustic signal A detected by the CPU 104 and a predetermined reference pitch within a predetermined range. A meter, a plurality of LEDs, and the like for notifying whether or not they are inside are provided. Although these meters, LEDs, and the like will be described later, the display unit 105 notifies when the difference is within the predetermined range by using the meters and LEDs.
[0016]
The sound emitting unit 106 is an example of a second notification unit according to the present invention, and includes a speaker (or an electronic buzzer). The sound emitting unit 104 notifies when the difference is within the predetermined range for a predetermined time.
[0017]
The ROM 107 stores a program for operating the CPU 104, reference pitch data, data indicating an error range from the reference value, and the like.
[0018]
The RAM 108 is for temporarily storing a working RAM provided in the CPU 104, data representing the detected pitch, and the like.
[0019]
FIG. 2 is a diagram showing an operation panel of the electronic tuner shown in FIG.
[0020]
The operation panel 110 is provided with a reference pitch selection switch 103_1, a time button 103_2, and a range button 103_3 that constitute an operator group 103.
[0021]
The reference pitch selection switch 103_1 is an operator for setting a reference pitch corresponding to each of the six strings, and the user selects a number from 1 to 6 to select a reference pitch corresponding to a desired string. Select.
[0022]
A time button (TIME) 103_2 is used to set a duration after the pitch of the input acoustic signal A detected by the CPU 104 (hereinafter simply referred to as a detected pitch) enters an error range from the reference pitch. It is an operator. Each time the time button 103_2 is pressed, the LED 105_4 (for a duration of 0.5 second), the LED 105_5 (for a duration of 1.0 second), and the LED 105_6 (for a duration of time) constituting the display device 105 provided above the time button 103_2. Time for 2.0 seconds) lights up and moves. Thereby, a desired duration can be selected. The initial value is set to a duration of 0.5 seconds (LED 105_4 is lit).
[0023]
The range button (RANGE) 103_3 is an operator for selecting an error range between the detected pitch and the reference pitch. Each time the range button 103_3 is pressed, the LED 105_7 (for error range ± 1 cent), the LED 105_8 (for error range ± 3 cent), and the LED 105_9 (for error range ± 5 cent) constituting the display device 105 provided above the time button 103_3 ) Lights up and moves. Thereby, a desired error range can be selected. As an initial value, an error range ± 1 cent is set (LED 105_7 is lit).
[0024]
Further, the operation panel 110 is provided with a meter 105_1 and LEDs 105_2 and 105_3 constituting the display unit 105.
[0025]
The meter 105_1 has a pointer 105_1a, the center indicates zero (the error between the detected pitch and the reference pitch is zero), the left side indicates the minus direction (the detected pitch is lower than the reference pitch), and the right side Indicates a positive direction (the detected pitch is higher than the reference pitch). Moreover, the scale to -50 Cent is engraved on the left side, and the scale to +50 Cent is engraved on the right side. Further, when the detected pitch is lower than the reference pitch, the LED 105_2 is turned on. Conversely, when the detected pitch is higher than the reference pitch, the LED 105_3 is turned on. If the error between the detected pitch and the reference pitch is within the set error range, both LED 105_2 and LED 105_3 are lit.
[0026]
Further, the operation panel 110 is provided with a speaker 106_1 constituting the sound emitting unit 106. The speaker 106_1 is sounded when the difference between the input detection pitch and the reference pitch is within the error range for a predetermined time, that is, to notify that the tuning is stable. For example, a selected reference sound is generated from the speaker 106_1. Note that a switch for stopping sound generation from the speaker 106_1 may be provided.
[0027]
The operation panel 110 also includes a microphone 110_1 for inputting the sound of the instrument to be tuned, an input terminal 110_2 for directly inputting the acoustic signal A, and a power switch for turning on the electronic tuner 100. 110_3. Note that when a plug such as a guitar is inserted into the input terminal 110_2, the input from the microphone 110_1 is cut off.
[0028]
FIG. 3 is a flowchart showing a main processing routine in the electronic tuner shown in FIG.
[0029]
This routine is executed when the electronic tuner 100 shown in FIG. 3 is powered on.
[0030]
First, in step S201, initial setting is performed. In this initial setting, the initial value of the duration set by the operation of the time button 103_2 (the duration after the detected pitch enters the error range from the reference pitch) is set to 0.5 seconds (the duration is stored). Stored in the T register). Also, the initial value of the error range between the detected pitch and the reference pitch set by operating the range button 103_3 is set to ± 1 cent (stored in the R register for storing the error range). Further, the LED 105_4 for duration 0.5 seconds and the LED 105_7 for error range ± 1 cent are turned on.
[0031]
Next, in step S202, setting mode processing is performed. Although details will be described with reference to FIG. 4, in the processing of this setting mode, the reference pitch selected by the reference pitch selection switch 103_1 is set, or the duration value set by the time button 103_2 is stored in the T register. The error range value set by the range button 103_3 is set in the R register.
[0032]
In step S203, detection mode processing is performed. The details will be described with reference to FIG. 5. In this detection mode process, the sound signal A is input to the electronic tuner 100 and activated to detect the pitch of the sound signal A, and the detected pitch. And the detection result is notified based on the difference from the reference pitch set in step S202 described above, and the process returns to step S202.
[0033]
FIG. 4 is a flowchart showing a routine of the setting mode shown in FIG.
[0034]
In the electronic tuner 100 of this embodiment, conditions for the pitch of the input acoustic signal A to match the reference pitch are initially set. If you want to set conditions different from the initially set conditions, Processed by the setting mode routine.
[0035]
First, in step S301, whether or not there is a key input of the operator group 103, that is, whether or not any of the buttons (keys) of the reference pitch selection switch 103_1, the time button 103_2, and the range button 103_3 has been operated. Is detected by scanning. If it is determined that there is no key input from the operator group 103, the routine is exited. On the other hand, if it is determined that there is a key input from the operator group 103, the process proceeds to step S302.
[0036]
In step S302, if the reference pitch selection switch 103_1 is operated, the process proceeds to step S313. If the range button 103_3 is operated, the process proceeds to step S308, which is a process for setting an error range between the detected pitch and the reference frequency. When the time button 103_2 is operated, the process proceeds to step S303, which is a process for setting a duration after the detected pitch enters the error range of the reference frequency.
[0037]
First, the case where the process proceeds to step S303 will be described. First, in step S303, when the time button 103_2 is operated in a state where the current setting is 0.5 second, the process proceeds to step S305, the set value of 1.0 second is stored in the T register, and the process returns to step S301. . On the other hand, if the time button 103_2 is operated in a state where the current setting is not 0.5 seconds, the process proceeds to step S304.
[0038]
In step S304, if the current setting is 1.0 second, the process proceeds to step S306, the setting value of 2.0 seconds is stored in the T register, and the process returns to step S301. If the current setting is not 1.0 second, the process proceeds to step S307. In step S307, the setting value of 0.5 seconds is stored in the T register, and the process returns to step S301.
[0039]
Next, the case where it progresses to step S308 is demonstrated. In step S308, when the range button 103_3 is operated in a state where the current setting is ± 1 cent, the process proceeds to step S310, the set value of ± 3 cent is stored in the R register, and the process returns to step S301. On the other hand, when the range button 103_3 is operated in a state where the current setting is not ± 1 cent second, the process proceeds to step S309.
[0040]
In step S309, if the current setting is ± 3 cent, the process proceeds to step S311 to store the set value of ± 5 cent in the R register, and the process returns to step S301. If the current setting is not ± 3 cent, the process proceeds to step S312. In step S312, the set value of ± 1 cent is stored in the R register, and the process returns to step S301.
[0041]
Further, if the process proceeds to step S313, in this step S313, reference pitches 1 to 6 corresponding to the selection by the reference pitch selection switch 103_1 are set, and the process returns to step S301.
[0042]
FIG. 5 is a flowchart showing a routine of the detection mode shown in FIG.
[0043]
First, in step S401, the timer for stability determination that determines that the difference between the detected pitch and the reference pitch is within a predetermined range for a predetermined time is cleared and counting is started.
[0044]
Next, in step S402, it is determined whether or not the input acoustic signal A exceeds a predetermined level. If it is determined that the predetermined level is not exceeded, this routine is terminated. On the other hand, if it is determined that the predetermined level is exceeded, the process proceeds to step S403 in order to detect the pitch.
[0045]
In step S403, the zero cross detection unit 102 or the CPU 104 detects the pitch of the input acoustic signal A, and the process proceeds to step S404.
[0046]
In step S404, the difference between the selected reference pitch and the detected pitch is obtained. If the difference is outside the predetermined range, the process returns to step S401 to newly detect the input acoustic signal A. On the other hand, if the difference is within the predetermined range, the process proceeds to step S405 to notify the situation.
[0047]
In step S405, since the difference between the pitch of the input acoustic signal A and the reference pitch is within a predetermined range, the state is displayed by the pointer 105_1a of the meter 105_1, and the two LEDs 105_2 and 105_3 are simultaneously turned on to detect the detected sound. Displays that the pitch is within the reference pitch range.
[0048]
Next, in step S406, whether or not the difference between the detected pitch and the reference pitch continues within a predetermined range (a range corresponding to the value of the R register) (time corresponding to the value of the T register). That is, it is determined whether or not a set time has elapsed within the set error range. The setting of the time required for the stability determination is performed in steps S303 to S307 described above. If it is determined that the difference has continued within the predetermined range, the process proceeds to step S407, and if it is not determined, the process returns to step S402.
[0049]
In step S407, in order to notify that the detected pitch of the input acoustic signal A satisfies all of the above conditions (a condition that a set time has elapsed within the set error range), the meter 105_1 is notified. The difference from the reference pitch (in this case, the display is almost zero) is displayed on the pointer 105_1a, and the two LEDs 105_2 and 105_3 are simultaneously turned on. Is released and the process returns to step S401.
[0050]
【The invention's effect】
As described above, according to the electronic tuner of the present invention, it can be recognized that tuning has been performed reliably.
[Brief description of the drawings]
FIG. 1 is a block diagram of an electronic tuner according to an embodiment of the present invention.
2 is a diagram showing an operation panel of the electronic tuner shown in FIG. 1. FIG.
FIG. 3 is a flowchart showing a main processing routine in the electronic tuner shown in FIG. 1;
4 is a flowchart showing a routine of a setting mode shown in FIG.
FIG. 5 is a flowchart showing a routine of a detection mode shown in FIG.
[Explanation of symbols]
100 Electronic Tuner 102 Zero Cross Detection Unit 103 Operator Group 103_1 Reference Pitch Selection Switch 103_2 Time Button 103_3 Range Button 104 CPU
105 Display portion 105_2, 105_3, 105_4, 105_5, 105_6, 105_7, 105_8, 105_9 LED
105_1 Meter 105_1a Pointer 106 Sound emitting unit 106_1 Speaker 107 ROM
108 RAM
110 Operation panel 110_1 Microphone 110_2 Input terminal 110_3 Power switch

Claims (6)

In an electronic tuner that informs whether the difference between the pitch of the input musical sound signal and a predetermined reference pitch is within a predetermined range,
First informing means for informing when the difference falls within the predetermined range;
An electronic tuning device comprising: second notification means for reporting when the difference is within the predetermined range for a predetermined time.   2. The electronic tuning apparatus according to claim 1, wherein the first notification means is visual notification means for performing visual notification.   2. The electronic rhythm device according to claim 1, wherein the second notification means is an auditory notification means for performing notification for hearing.   3. The electronic rhythm device according to claim 2, wherein the visual notification means is a meter that notifies by movement of a pointer.   3. The electronic tuner as claimed in claim 2, wherein the visual notification means is a light emission means that notifies the light emission state of the light emitter.   4. The electronic rhythm device according to claim 3, wherein the hearing notification means is a sound generation means for generating a sound and notifying.

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