JP6237449B2 - Sound processor - Google Patents

Description

  The present invention relates to a sound processing apparatus capable of improving the accuracy of sound analysis generated around.

  Hearing impaired people may not be able to recognize sounds generated around them. Even if the person is not a hearing impaired person, when working with headphones, the sound generated around him / her may not be recognized.

JP 2011-165056 A Japanese Patent No. 4119299

  If sound is generated around a person with hearing impairment, etc., if the generated sound is analyzed and the sound can be informed to the person, the inconvenience that the sound cannot be recognized is reduced. Can be made.

  An object of this invention is to provide the sound processing apparatus which can improve the precision of the sound analysis which generate | occur | produced around.

  In order to solve the above-described problems of the related art, the present invention provides a sound source and a housing based on a housing, a plurality of microphones attached to the housing, and acoustic signals output from the plurality of microphones. A sound source direction deriving unit for deriving a positional relationship with the body, a motion detection sensor for detecting movement of the housing, a positional relationship between the sound source derived by the sound source direction deriving unit and the housing, and the motion detection A sound processing apparatus comprising: a signal processing unit that corrects the frequency or volume of the selected acoustic signal based on the movement of the housing detected by a sensor.

  According to the sound processing apparatus of the present invention, it is possible to improve the accuracy of sound analysis generated around.

It is a block diagram which shows the sound processing apparatus of one Embodiment. It is a figure which shows the directivity pattern of the housing | casing which accommodates the sound processing apparatus of one Embodiment, and a microphone. It is a flowchart which shows operation | movement of the sound processing apparatus of one Embodiment. It is a figure for demonstrating the frequency correction in the sound processing apparatus of one Embodiment. It is a figure for demonstrating the volume correction | amendment in the sound processing apparatus of one Embodiment. It is a figure for demonstrating the switching operation | movement of the channel for sound analysis accompanying the movement of a housing | casing, and is a conceptual diagram which shows the state before the movement of a housing | casing. It is a figure for demonstrating the switching operation | movement of the channel for sound analysis accompanying the movement of a housing | casing, and is a conceptual diagram which shows the state in the middle of the housing | casing moving. It is a figure for demonstrating the switching operation | movement of the channel for sound analysis accompanying the movement of a housing | casing, and is a conceptual diagram which shows the state which the movement of a housing | casing was completed.

  Hereinafter, a sound processing apparatus according to an embodiment will be described with reference to the accompanying drawings. As shown in FIG. 1, the sound processing apparatus according to an embodiment includes at least two microphones 1 including microphones 1 a and 1 b. The number of microphones 1 is preferably three or more.

  The sound processing apparatus of one embodiment is accommodated in the housing 100 shown in FIG. As shown in FIG. 2, the microphones 1 a and 1 b are attached in the vicinity of two corners of the housing 100, for example. When the number of the microphones 1 is four including the microphones 1c and 1d, the microphones 1a to 1d may be attached near the four corners.

  If the microphones 1a and 1b are non-directional, ideally, the microphones 1a and 1b have a circular directivity centered on the microphones 1a and 1b. However, since the microphones 1 a and 1 b are incorporated in the housing 100, ideal directivity is not achieved due to sound reflection and absorption by the housing 100.

  The directivity patterns D1a and D2a of the microphones 1a and 1b are wide in the directions Dr1a1 and Dr1b1 on the outside of the housing 100, and are narrow in the directions Dr1a2 and Dr1b2 on the inside of the housing 100. The directivity patterns D1a and D2a are not necessarily circular, but are circular for convenience in FIG.

  In FIG. 1, an acoustic signal generated by collecting sounds by the microphones 1 a and 1 b is input to the channel switching unit 2 and the sound source direction deriving unit 3. The channel switching unit 2 includes storage units 21 and 22, a read control unit 23, and a switch 24. The acoustic signal output from the microphone 1 a is input to the storage unit 21, and the acoustic signal output from the microphone 1 b is input to the storage unit 22.

  The storage unit 21 stores the acoustic signal output from the microphone 1a. The storage unit 22 stores the acoustic signal output from the microphone 1b.

  The sound source direction deriving unit 3 determines the direction of the sound source based on the acoustic signals output from the microphones 1a and 1b. When there are two microphones 1, the direction of the sound source can be determined by limiting the direction of the sound source to 180 degrees. If there are three or more microphones 1, the direction of the sound source can be determined in a range of 360 degrees.

  The technique described in Patent Document 2 may be used for determining the direction of the sound source in the sound source direction deriving unit 3.

  The motion detection sensor 4 detects the motion of the housing 100. The motion detection sensor 4 is preferably composed of both an acceleration sensor that detects the acceleration of the housing 100 and an angular velocity sensor (gyro sensor) that detects the angular velocity of the housing 100. The acceleration sensor may be a triaxial acceleration sensor. Since the motion detection sensor 4 includes the acceleration sensor and the angular velocity sensor, it is possible to detect the attitude of the casing 100 and the movement amount of the casing 100.

  The motion detection information output from the motion detection sensor 4 is input to the sound source direction deriving unit 3 and the signal processing unit 5.

  The sound source direction deriving unit 3 preferably determines the direction of the sound source using the acoustic signals output from the microphones 1 a and 1 b and the motion detection information output from the motion detection sensor 4. It is preferable that the sound source direction deriving unit 3 calculates the movement amount of the housing 100 based on the motion detection information, predicts the movement of the housing 100 based on the calculated movement amount, and determines the direction of the sound source. The sound source direction deriving unit 3 derives the positional relationship between the sound source and the housing 100 based on the motion detection information.

  The sound source direction deriving unit 3 generates a channel switching control signal for the channel switching unit 2 to select and output any one of the acoustic signals output from the microphones 1a and 1b. The channel switching control signal is input to the read control unit 23.

  When the channel switching control signal indicates that the acoustic signal output from the microphone 1 a is selected, the readout control unit 23 controls to read out the acoustic signal stored in the storage unit 21. At this time, the read control unit 23 controls the switch 24 to be connected to the terminal Ta. Therefore, the acoustic signal read from the storage unit 21 is supplied to the signal processing unit 5.

  On the other hand, when the channel switching control signal indicates that the acoustic signal output from the microphone 1b is selected, the readout control unit 23 controls to read out the acoustic signal stored in the storage unit 22. At this time, the read control unit 23 controls the switch 24 to be connected to the terminal Tb. Therefore, the acoustic signal read from the storage unit 22 is supplied to the signal processing unit 5.

  As described above, the channel switching unit 2 is output from one microphone 1 out of the two acoustic signals output from the microphones 1 a and 1 b based on the channel switching control signal output from the sound source direction deriving unit 3. Select and output an acoustic signal.

  The channel of the microphone 1 selected by the channel switching unit 2 is referred to as a sound analysis channel. The sound signal of the sound analysis channel output by the channel switching unit 2 is referred to as a selected sound signal.

  Similarly, when the number of microphones 1 is three or more, the channel switching unit 2 stores each of the acoustic signals output from the plurality of microphones 1 in the storage unit. The channel switching unit 2 selects any one sound analysis channel from a plurality of channels of the microphone 1 based on the channel switching control signal, and outputs the sound signal of the sound analysis channel as a selected sound signal.

  In addition to the selected acoustic signal output from the channel switching unit 2, the signal processing unit 5 includes information indicating the direction of the sound source output from the sound source direction deriving unit 3 and motion detection information output from the motion detection sensor 4. Are entered.

  The signal processing unit 5 includes an unnecessary frequency band suppression unit 51, a frequency correction unit 52, and a volume correction unit 53.

  The unnecessary frequency band suppression unit 51 suppresses a frequency band that is unnecessary for the analysis of the acoustic signal in the subsequent sound analysis unit 6 among the frequency bands of the input selected acoustic signal. The frequency correction unit 52 corrects the frequency of the input selected acoustic signal. The volume correction unit 53 corrects the volume of the input selected acoustic signal.

  Although it is not essential to provide the unnecessary frequency band suppression unit 51, the frequency correction unit 52, and the volume correction unit 53, it is preferable to provide them. Only the unnecessary frequency band suppression unit 51 may be provided. It is preferable to provide a frequency correction unit 52 and a volume correction unit 53 in addition to the unnecessary frequency band suppression unit 51. Specific operations of the frequency correction unit 52 and the volume correction unit 53 will be described later.

  The selected acoustic signal that has been subjected to predetermined signal processing by the signal processing unit 5 is input to the sound analysis unit 6. The sound dictionary storage unit 7 stores a sound dictionary in which a plurality of acoustic patterns are registered. An acoustic pattern is an arbitrary combination of one or a plurality of elements such as sound frequency, volume, frequency change method, and sound duration.

  The sound analysis unit 6 compares the input acoustic pattern of the selected acoustic signal with a plurality of acoustic patterns stored in the sound dictionary storage unit 7 and analyzes the selected acoustic signal. The sound analysis unit 6 specifies what kind of sound the generated sound is and what kind of sound the generated sound is.

  Both sound signals output from the microphones 1a and 1b may be input to the sound analysis unit 6, but in this embodiment, a selection sound signal of the sound analysis channel of one channel is input. . Therefore, the sound analysis unit 6 minimizes the processing load for sound analysis of one channel.

  In the present embodiment, the acoustic patterns registered in the sound dictionary are, for example, sounds generated by telephones, door phones, alarm clocks, alarms, etc., and sounds generated by accidents such as explosions. The word pattern may be registered in the sound dictionary storage unit 7 and the sound analysis unit 6 may analyze the words.

  If the sound analysis unit 6 compares the acoustic pattern of the selected acoustic signal with a plurality of acoustic patterns registered in the sound dictionary and the acoustic pattern of the selected acoustic signal matches any of the plurality of acoustic patterns, the sound analysis unit 6 supplies the control unit 8 with the code of the matched acoustic pattern.

  The control unit 8 includes a display control unit 81 and a registration control unit 82. The control unit 8 receives the code output from the sound analysis unit 6 and information indicating the direction of the sound source output from the sound source direction deriving unit 3.

  The display control unit 81 includes information in which a code is associated with a sound source type (for example, a telephone, a door phone, an alarm clock, an alarm), or a sound type (for example, an explosion sound, a sound that breaks glass). .

  The display control unit 81 controls the display driving unit 9 to display information indicating the sound source direction and the sound analysis result on the display unit 10 based on the input code and information indicating the direction of the sound source. The display driving unit 9 displays the above information on the display unit 10 based on display control by the display control unit 81. The display unit 10 is, for example, a liquid crystal display device.

  As shown in FIG. 2, the display unit 10 is attached to the housing 100. A user who uses the sound processing apparatus of the present embodiment can confirm what sound (what sound) is generated from which direction by looking at the display unit 10.

  The display control unit 81 may display only information on what sound (what sound) is generated on the display unit 10. For example, a telephone set installed in a house often has a fixed installation location. When displaying information on the sound generated by the sound source having a fixed installation location on the display unit 10, it is not necessary to display the direction in which the sound is generated. Therefore, the display of the direction in which the sound is generated can be omitted.

  On the other hand, in the case where information regarding the sound where the place where the sound is generated, such as explosion sound or glass breaking sound, is not specified, is displayed on the display unit 10, the display control unit 81 causes the display unit 10 to select what sound from which direction. It is preferable to display information on what kind of sound has occurred.

  As a result of comparing and collating the acoustic pattern of the selected acoustic signal with the plurality of acoustic patterns registered in the sound dictionary, the sound analysis unit 6 may not match the acoustic pattern of the selected acoustic signal with any of the plurality of acoustic patterns. Can happen. That is, the case where the acoustic pattern of the selected acoustic signal is an acoustic pattern that is not registered in the sound dictionary occurs.

  In such a case, it is preferable that the sound analysis unit 6 newly registers the acoustic pattern of the selected acoustic signal in the sound dictionary.

  When the acoustic pattern of the selected acoustic signal is an acoustic pattern that is not registered in the sound dictionary, the sound analysis unit 6 and the control unit 8 specifically operate as follows. The sound analysis unit 6 temporarily stores (temporarily registers) the sound pattern of the selected sound signal in the sound dictionary storage unit 7. The sound analysis unit 6 supplies the control unit 8 with a code indicating that the acoustic pattern of the selected acoustic signal is not registered.

  The display control unit 81 controls the display driving unit 9 to display a message for selecting whether or not to newly register an acoustic pattern on the display unit 10 based on a code indicating that it is not registered. The display driving unit 9 displays the above message on the display unit 10 based on the display control by the display control unit 81.

  The user can select whether or not to newly register an acoustic pattern by operating the operation unit 11. When an instruction to newly register an acoustic pattern is given from the operation unit 11, the registration control unit 82 instructs the sound analysis unit 6 to fully register the acoustic pattern of the selected acoustic signal in the sound dictionary.

  The sound analysis unit 6 assigns a new code to the temporarily registered acoustic pattern and associates the code with the acoustic pattern so as to be registered in the sound dictionary.

  If an instruction to newly register an acoustic pattern is not given from the operation unit 11, the registration control unit 82 instructs the sound analysis unit 6 to delete the acoustic pattern temporarily stored in the sound dictionary storage unit 7. The sound analysis unit 6 erases the acoustic pattern temporarily stored in the sound dictionary storage unit 7.

  The operation of the sound processing apparatus of this embodiment will be described again with reference to the flowchart shown in FIG. In FIG. 3, when the sound processing device starts operation, the channel switching unit 2 and the sound source direction deriving unit 3 acquire acoustic signals from the microphones 1a and 1b of the respective channels in step S101. In step S102, the channel switching unit 2 temporarily stores the acoustic signals of the respective channels in the storage units 21 and 22.

  In step S103, the sound source direction deriving unit 3 specifies the direction of the sound source and supplies a channel switching control signal to the channel switching unit 2 (reading control unit 23). In step S104, the channel switching unit 2 selects a sound analysis channel and supplies the selected acoustic signal to the signal processing unit 5.

  In parallel with the processes in steps S101 to S104, the motion detection sensor 4 starts detecting the motion of the housing 100 in step S201. The sound source direction deriving unit 3 calculates the amount of movement of the housing 100 in step S202.

  In step S105, the sound source direction deriving unit 3 monitors the relative positions of the sound source and the sound analysis channel. In step S106, the sound source direction deriving unit 3 determines whether or not the sound source is within the sound collection region of the selected sound analysis channel. The specific meaning of whether or not the sound source is within the sound collection area of the sound analysis channel will be described later.

  If the sound source is not within the sound collection area of the selected sound analysis channel (NO), the sound source direction deriving unit 3 instructs the channel switching unit 2 to switch the sound analysis channel in step S107 and performs processing. Return to step S106.

  If the sound source is within the sound collection area of the selected sound analysis channel (YES), in step S108, the channel switching unit 2 receives an acoustic signal (selected acoustic signal) from the storage unit corresponding to the selected sound analysis channel. Is supplied to the signal processing unit 5.

  In step S109, the signal processing unit 5 limits the band of the input selected acoustic signal, corrects the frequency as necessary, and corrects the volume as necessary.

  The frequency correction unit 52 corrects the frequency of the sound that changes due to the Doppler effect when the microphone 1 (that is, the casing 100) moves. The volume correction unit 53 corrects the volume that changes due to the directivity of the microphone 1 when the housing 100 moves and the positional relationship between the sound source and the microphone 1 changes.

  Here, the frequency correction in step S109 will be described with reference to FIG. In FIG. 4, the sound emitted from the sound source SS is a spherical wave as indicated by the alternate long and short dash line, and the sound pressure and particle velocity are constant on the spherical surface centered on the sound source SS. Assume that the microphone 1 moves from position P0 to position P1,... Position Pn.

  The sound source direction deriving unit 3 obtains the positional relationship between the sound source SS and the position P0 and supplies information indicating the direction of the sound source to the signal processing unit 5. The frequency correction unit 52 obtains the movement angle θ and the movement speed Vm of the microphone 1 based on the movement detection information output from the movement detection sensor 4. The movement angle θ and the movement speed Vm of the microphone 1 may be obtained outside the signal processing unit 5 and the information thereof may be supplied to the frequency correction unit 52.

  If the microphone 1 is stationary, the propagation speed of the sound wave is Vs (generally 340 m / s). When the microphone 1 moves from the position P0 to the position P1, the relative velocity between the sound wave and the microphone 1 is Vs−Vm · cos θ.

  Assuming that the frequency of the sound collected by the microphone 1 is fsr and the frequency of the sound emitted from the sound source SS is fs, the pitch (frequency) of the sound is expressed by Equation (1).

  fsr = fs (Vs−Vm · cos θ) / Vs (1)

When equation (1) is rewritten, equation (2) is obtained.
fs = fsr · Vs / (Vs−Vm · cos θ) (2)

  The frequency correction unit 52 can correct the frequency of the sound that changes due to the Doppler effect based on the equation (2). Since the frequency correction unit 52 corrects the frequency even when the housing 100 moves, the possibility that the sound analysis unit 6 erroneously analyzes the sound can be reduced.

  The volume correction in step S109 will be described with reference to FIG. As described with reference to FIG. 2, since the microphone 1 has directivity, the volume of sound collected by the microphone 1 may change when the housing 100 moves.

  FIG. 5 shows the housing 100 in a simplified manner. The microphone 1 shown in FIG. 5 corresponds to the microphone 1a.

  Due to the directivity of the microphone 1 in a state of being incorporated in the housing 100, the sound volume collected by the microphone 1 varies depending on the direction in which the sound enters. The volume correction unit 53 stores a correction coefficient for correcting the variation in volume in advance.

  A correction coefficient for correcting variation in volume can be determined based on the sensitivity of the microphone 1 in each circumferential direction of the microphone 1.

  In FIG. 2, it is assumed that the sensitivity of the microphone 1a is relatively 1 in the direction Dr1a1 and 0.5 in the direction Dr1a2. In this case, if the sound source is located in the direction Dr1a1 and multiplied by the correction coefficient 1, and if the sound source is located in the direction Dr1a2 and multiplied by the correction coefficient 2, the variation in volume caused by the directivity of the microphone 1 Can be corrected.

  In FIG. 5, it is assumed that the housing 100 moves from position P00 to position P10,... Position Pn0. At the position P00, the housing 100 is assumed to be oriented in the circumferential direction as illustrated. At the position P10, the casing 100 is rotated clockwise in FIG. 5 as compared with the orientation at the position P00, and is in the orientation as illustrated in the circumferential direction.

The sound volume correction unit 53 obtains an angle formed by the sound source SS and the direction Dr1a1 at each position (orientation) of the housing 100. The volume correction unit 53 obtains an angle θ _P00 formed by the sound source SS and the direction Dr1a1 when the housing 100 is located at the position P00. Sound volume corrector 53, when the housing 100 is positioned at the position P10, determining the angle theta _P10 formed by the sound source SS and direction Dr1a1.

  The angle formed between the sound source SS and the direction Dr1a1 at each position of the housing 100 may be obtained outside the signal processing unit 5, and information indicating the angle may be supplied to the volume correction unit 53.

The volume correction unit 53 corrects the volume of the selected acoustic signal input at each of the positions P00, P10... Based on the correction coefficient corresponding to the angles θ _P00 , θ _P10 .

  Incidentally, as shown in FIG. 5, the distance between the sound source SS and the microphone 1 differs at positions P00, P10. Strictly speaking, when the distance is different, the sound volume is also different, and the sound volume is changed according to the distance between the sound source SS and the microphone 1. However, since the distance between the sound source SS and the microphone 1 cannot be calculated, in this embodiment, the difference in volume due to the difference in distance is ignored.

  The volume correction unit 53 may finely detect changes in the position (orientation) of the housing 100 and finely correct the volume of the selected acoustic signal each time.

  Returning to FIG. 3, the sound analysis unit 6 analyzes the selected sound signal in step S110. In step S111, the sound analysis unit 6 determines whether or not the sound pattern matches the acoustic pattern registered in the sound dictionary.

  If it matches with the acoustic pattern registered in the sound dictionary (YES), the sound analysis unit 6 outputs the code of the matched acoustic pattern in step S112. In step S113, the display control unit 81 displays the sound source direction and the sound analysis result indicated by the code of the acoustic pattern on the display unit 10, and ends the process.

  The display control unit 81 may erase the information displayed on the display unit 10 after a predetermined time, or may erase the information when the user instructs to erase the information by operating the operation unit 11. .

  On the other hand, if it does not match the acoustic pattern registered in the sound dictionary in step S111 (NO), the sound analysis unit 6 temporarily stores the acoustic pattern of the selected acoustic signal in the sound dictionary storage unit 7 in step S114. And output a code indicating that it is an unregistered acoustic pattern.

  In step S115, the display control unit 81 causes the display unit 10 to display a message for selecting the sound source direction and the necessity of registration of the acoustic pattern in the sound dictionary.

  In step S116, the registration control unit 82 determines whether there is an instruction to register in the sound dictionary. If there is an instruction to register in the sound dictionary (YES), the registration control unit 82 adds a new code to the temporarily stored acoustic pattern and registers it in the sound dictionary in step S117, and ends the process.

  If there is no instruction to register in the sound dictionary (NO), the display control unit 81 deletes the display of the message or the like and ends the process.

  With reference to FIGS. 6A to 6C, how the channel switching unit 2 switches the sound analysis channel as the casing 100 moves is described. Here, a case where the sound source direction deriving unit 3 predicts the movement of the casing 100 and the channel switching unit 2 switches the sound analysis channel based on the prediction result will be described.

  In FIG. 6A, the user 200 is carrying the housing | casing 100 so that it may be located in front of the body (lower side of FIG. 6A). The sound collection area R1a is a sound collection area by the microphone 1a, and the sound collection area R1b is a sound collection area by the microphone 1b. Actually, the sound collection areas R1a and R1b are not clearly divided as shown in the figure, but are divided for convenience.

  The sound collection region R1a is an angle region in which sound collection by the microphone 1a is suitable when the sound source is located on the microphone 1a side. The sound collection region R1b is an angle region in which sound collection by the microphone 1b is suitable when the sound source is located on the microphone 1b side.

  The sound source being in the sound collection region R1a means that the sound source is located in the angle region indicated by the sound collection region R1a. The sound source being in the sound collection region R1b means that the sound source is located in the angle region indicated by the sound collection region R1b.

  As shown in FIG. 6A, it is assumed that a predetermined sound is generated at the right rear of the user 200. The sound source SS is in the sound collection area R1a. In this case, the microphone 1a is a sound analysis channel. The acoustic signal output from the microphone 1 a is read from the storage unit 21 and supplied to the sound analysis unit 6. The sound processing apparatus of this embodiment starts the analysis of the input acoustic signal as described above.

  As shown in FIG. 6B, it is assumed that the user 200 changes the direction of the body counterclockwise. The sound source SS is still in the sound collection area R1a. Therefore, the microphone 1a remains as a sound analysis channel.

  The motion detection sensor 4 detects the motion of the housing 100 when the user 200 changes the body direction. The sound source direction deriving unit 3 predicts the motion of the housing 100 based on the motion detection information from the motion detection sensor 4.

  As illustrated in FIG. 6C, it is assumed that the user 200 further stops the movement by changing the direction of the body counterclockwise. In FIG. 6C, the sound source SS has moved into the sound collection region R1b. In this case, the microphone 1b is a sound analysis channel.

  Since the sound source direction deriving unit 3 predicts the movement of the casing 100, when moving from FIG. 6B to FIG. 6C, the timing at which the sound source SS moves from the sound collection region R1a to the sound collection region R1b is determined in advance. It is possible to predict.

  Therefore, the channel switching unit 2 can switch the sound analysis channel from the microphone 1a to the microphone 1b at a timing when the sound source SS is predicted to move from the sound collection region R1a to the sound collection region R1b.

  Thus, according to the present embodiment, the sound source SS is substantially synchronized with the timing at which the sound source SS moves from the sound collection area R1a to the sound collection area R1b or from the sound collection area R1b to the sound collection area R1a. It is possible to switch the analysis channel.

  If the sound source direction deriving unit 3 predicts the movement of the casing 100 and the channel switching unit 2 switches the sound analysis channel based on the prediction result, the channel can be switched with good timing. Then, sound analysis can be performed by selecting an acoustic signal from a channel having the best sound quality (relatively good sound quality) from among a plurality of sound analysis channels.

  By deriving the positional relationship between the sound source SS and the housing 100 by the sound source direction deriving unit 3 and detecting the movement of the housing 100 by the motion detection sensor 4, changes in the position of the housing 100 can be detected in detail. Then, by correcting the frequency or volume of the acoustic signal by the signal processing unit 5, it is possible to improve the analysis accuracy of the acoustic signal by the sound analysis unit 6.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention. Of each unit shown in FIG. 1, a portion that can be configured by software (computer program) may be configured by software. Use of hardware and software is optional.

1, 1a, 1b Microphone 2 Channel switching unit 3 Sound source direction deriving unit 4 Motion detection sensor 6 Sound analysis unit 10 Display unit 52 Frequency correction unit 53 Volume correction unit 81 Display control unit 100 Case

Claims (5)

A housing,
A plurality of microphones attached to the housing;
A sound source direction deriving unit for deriving a positional relationship between a sound source and the housing based on acoustic signals output from the plurality of microphones;
A motion detection sensor for detecting the motion of the housing;
Signal processing for correcting the frequency or volume of the acoustic signal based on the positional relationship between the sound source derived by the sound source direction deriving unit and the housing and the movement of the housing detected by the motion detection sensor And
A sound processing apparatus comprising: A sound analysis unit that analyzes what the sound source or the acoustic signal is based on the acoustic signal corrected by the signal processing unit;
A display control unit for controlling the analysis result of the sound analysis unit to be displayed on the display unit;
The sound processing apparatus according to claim 1, further comprising:   The sound processing according to claim 2, wherein the display control unit controls the display unit to display information indicating a positional relationship between the sound source derived by the sound source direction deriving unit and the housing. apparatus.   One microphone selected from the plurality of microphones based on the positional relationship between the sound source derived by the sound source direction deriving unit and the housing and the movement of the housing detected by the motion detection sensor The sound processing apparatus according to claim 1, further comprising a channel switching unit that selects a sound signal output from the sound processing unit.   The sound source direction deriving unit predicts the movement of the casing based on the movement of the casing detected by the motion detection sensor, and switches a channel switching control signal so as to switch an acoustic signal to be selected at a timing based on the prediction result. The sound processing apparatus according to claim 4, wherein the sound is supplied to the channel switching unit.

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