JP2002171587A - Sound volume regulator for on-vehicle acoustic device and sound recognition device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound volume regulator for an on-vehicle acoustic device that can automatically regulate a sound volume of the on-vehicle acoustic device to a proper volume not disturbing conversations or the like for passengers and automatically regulate the sound volume of the on-vehicle acoustic device to a proper volume in response to a noise environment in the vehicle and to provide a sound recognition device using the sound volume regulator. SOLUTION: The sound volume regulator 1 automatically decreases an output level of a sound output of the on-vehicle acoustic device 2 to a prescribed 1st reference output level not disturbing conversations of passengers when detecting the conversation sound of the passengers through a microphone array 11. Furthermore, the sound volume regulator 1 automatically increases the output level of the output sound of the on-vehicle acoustic device 2 to a prescribed 2nd reference output level to a degree of expecting recovery of a listening sense lost by noise when detecting the noise of a prescribed level or over being the noise in the vehicle other than the conversation sound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume control device for a vehicle-mounted acoustic device and a voice recognition device using the same.

[0002]

2. Description of the Related Art As a first prior art of a sound volume control device for a vehicle-mounted acoustic device, a degree of noise in a vehicle interior is observed using a microphone, and the volume of the vehicle-mounted sound device is adjusted in accordance with the magnitude of the observed noise. There is a technology to do.

Further, as a second prior art, a traveling state of a vehicle is grasped on the basis of a signal given from traveling state detecting means for detecting a traveling state of the vehicle, and an on-vehicle acoustic device is detected based on the grasped traveling state. There is a technology for adjusting the volume of the sound.

[0004]

However, in the first prior art, since it is not determined whether the noise in the cabin is a noise or a conversation sound, conversation is performed between the passengers. In such a case, it is determined that the noise has increased, and the volume of the on-vehicle acoustic device is increased, which may hinder conversation.

In the second prior art, since the sound volume of the on-vehicle acoustic device is adjusted based on the running state of the vehicle detected by the running state detecting means, the running window which is not detected by the running state detecting means. It is not possible to cope with changes in the noise environment inside the vehicle due to opening and closing of the vehicle, and there is a possibility that the sound of the vehicle-mounted acoustic device becomes difficult to hear when the vehicle interior noise increases due to the opening of the window during traveling. .

Further, in the first and second prior arts,
Since there is no function to detect the direction of the sound source (speaker, etc.) in the cabin and adapt the microphone's directivity to that direction. In addition, there is a problem that a complicated setting operation such as the directivity of the microphone is required to be adjusted in accordance with the difference between the installation position of the microphone and the seating position (or seat position) of the passenger in the passenger compartment.

[0007] In view of the above problems, the first aspect of the present invention.
It is an object of the present invention to provide a sound volume control device for a vehicle-mounted audio device that can automatically adjust the volume of the vehicle-mounted audio device to an appropriate value that does not hinder passenger conversation and the like, and a voice recognition device using the same. It is.

A second object of the present invention is to provide a sound volume control device for an on-vehicle acoustic device capable of automatically adjusting the sound volume of the on-vehicle sound device to an appropriate value in accordance with the noise environment in the vehicle compartment. An object of the present invention is to provide a speech recognition device used.

Further, a third object of the present invention is to determine the directivity of a microphone array as sound acquisition means according to the installation position of the sound acquisition means and the seating position (or seat position) of a passenger in a vehicle cabin. Provided is a volume control device for an in-vehicle acoustic device and a voice recognition device using the same, which can automatically adapt to the direction of the user and can substantially eliminate the manual adjustment of the directivity of the sound acquisition means. That is.

[0010]

A technical means for achieving the above object is a sound volume adjusting device for an on-vehicle audio device for adjusting the volume of an on-vehicle audio device, which is provided at a predetermined installation position in a vehicle cabin. A sound acquisition unit that is installed and has a directivity of sound acquisition, and a sound acquisition direction based on the directivity is set to a direction corresponding to at least one seating position in the vehicle interior; And a sound volume adjusting means for decreasing the sound volume of the on-vehicle acoustic device in accordance with an increase in the sound volume.

Preferably, the sound acquisition means includes a first sound acquisition direction set corresponding to the at least one seating position, and a second sound acquisition direction set corresponding to a direction other than the seating position in the vehicle interior. And the sound acquisition direction can be switched, and the sound volume adjustment means adjusts the sound volume of the on-vehicle acoustic device according to an increase in the sound volume from the first sound acquisition direction detected by the sound acquisition means. On the other hand, the sound volume of the on-vehicle acoustic device may be increased in accordance with an increase in the volume of the sound from the second sound acquisition direction detected by the sound acquisition unit.

Preferably, the sound acquisition means is a microphone array whose sound acquisition direction is variable.

Further, preferably, the volume control device of the on-vehicle acoustic device detects the volume of the sound acquired by the microphone array while changing the sound acquisition direction of the microphone array, and increases the volume or volume of the sound. It is preferable to further include a sound acquisition direction setting means for setting the sound acquisition direction in which the sound level is equal to or higher than a predetermined reference level corresponding to the conversation sound to the microphone array as the first sound acquisition direction.

According to another aspect of the present invention, there is provided a voice recognition apparatus using the volume control device of the on-vehicle audio device according to any one of claims 1 to 4. The volume control device of the vehicle-mounted acoustic device according to any one of the above, and the sound control unit of the vehicle-mounted acoustic device is input via the sound acquisition unit or another sound acquisition unit provided in addition to the sound acquisition unit. Based on your voice input,
Voice recognition means for recognizing the input content of the voice input.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> FIG. 1 is a block diagram of a sound volume control device for a vehicle-mounted acoustic device according to a first embodiment of the present invention. As shown in FIG. 1, the volume control device 1 includes a microphone array (sound acquisition means) 11 in which a plurality of microphones are arranged, a microphone array controller 12, a directional characteristic calculator 13, a sound signal level analyzer Unit 14, signal processing unit 15, audio power calculation unit 16
And an optimal volume value calculation unit 17.
The sound volume of the in-vehicle audio device (CD player, radio, etc.) 2 is automatically controlled. Among them, the audio power calculation unit 16 and the optimum volume value calculation unit 17 correspond to the volume adjustment unit according to the present invention.

The microphone array 11 is sound acquisition means whose sound acquisition direction (directivity) is variable, and is installed at a predetermined installation position in a vehicle cabin. The microphone array control unit 12 responds to the sound acquisition direction determined by the directivity calculation unit 13 by individually advancing or delaying the phase of the sound signal of the sound acquired by each microphone provided in the microphone array 11. The sound acquisition direction of the microphone array 11 is set to a direction in which the sound is acquired, and a sound signal of the sound acquired by the microphone array 11 from the sound acquisition direction is given to the signal processing unit 15.

The directional characteristic calculation unit 13 includes, as a sound acquisition direction to be set in the microphone array 11, a first sound setting direction for acquiring a consonant sound corresponding to at least one sitting position (or a seat position) in the vehicle interior. , And a second sound acquisition direction for acquiring noise (noise) other than the harmonies corresponding to directions other than the seating position in the vehicle interior. Then, the directional characteristic calculation unit 13 calculates various parameters necessary for setting the sound acquisition direction of the microphone array 11 to the first and second sound acquisition directions, and outputs the calculation result to the microphone array control unit 12. Then, based on the output result, the microphone array controller 12 switches the sound acquisition direction of the microphone array 11.

In the present embodiment, a direction corresponding to the driver's seat and a direction corresponding to the passenger's seat (and another seat (such as a rear seat, if necessary)) are set as the first sound acquisition direction. The second sound acquisition direction may be a sound source direction of noise (noise other than conversation sound) generated in the vehicle interior, or an intrusion direction of noise entering the vehicle interior from the outside (for example,
(The direction of the dashboard, windows, etc.). As described above, at least one direction is set as the first and second sound acquisition directions, respectively, and the microphone array control unit 12 and the directional characteristic calculation unit 13
, The sound acquisition direction of the microphone array 11 is sequentially and cyclically switched to each of the directions set as the first and second sound acquisition directions (for example, a driver's seat, a passenger seat, a dash Boards, windows, etc. are switched sequentially and cyclically).

Further, the directional characteristic calculation unit 13 outputs a signal indicating which of the first and second sound acquisition directions the sound acquisition direction of the microphone array 11 is set at each time. The signal is output to the signal level analysis unit 14 and the optimum sound volume value calculation unit 17.

The sound signal level analysis unit 14 detects an output level (volume) output from the speaker 21 of the audio device 2, and outputs the output level to the microphone array 11 at each time given from the directional characteristic calculation unit 13. By performing predetermined processing based on the signal indicating the set sound acquisition direction, the sound output by the acoustic device 2 included in the sound acquired by the microphone array 11 from the set sound acquisition direction at each time point , A signal (pseudo-signal) corresponding to is generated and supplied to the signal processing unit 15.

Here, as a method of creating a pseudo signal, a simulation is performed by arithmetic processing to determine how the sound output from the speaker 21 is acquired by the microphone array 11 having directivity set in each sound acquisition direction. In advance, a method of creating a pseudo signal and how the sound output from the speaker 21 is acquired by the microphone array 11 whose directivity is set in each sound acquisition direction is obtained in advance by an experiment, A method of creating a pseudo signal by using an experimental result may be considered.

The signal processing unit 15 subtracts the pseudo signal supplied from the sound signal level analysis unit 14 from the sound signal supplied from the microphone array control unit 12 to obtain each sound set at each time. A sound power calculation unit generates a corrected sound signal corresponding to a corrected sound substantially eliminating the influence of the output sound of the acoustic device 2 obtained by the microphone array 11 from the sound obtained by the microphone array 11 from the obtaining direction. 16 is output. here,
The correction sound means sounds in the vehicle interior (such as conversation sound and noise) other than the output sound of the acoustic device 2 acquired by the microphone array 11.

The audio power calculation unit 16 includes a signal processing unit 15
The sound level of the corrected sound corresponding to the corrected sound signal is calculated on the basis of the corrected sound signal given by, and is output to the optimum sound volume value calculating unit 17.

The optimum sound volume calculating section 17 calculates each sound acquisition direction set at each time based on the signal supplied from the directivity calculating section 13 and the sound level of the correction sound provided from the audio power calculating section 16. To microphone array 1
1. The sound level of the corrected sound acquired by step 1 is recognized, and the sound adjustment of the sound device 2 is automatically performed.

More specifically, the correction sound acquired from the first sound acquisition direction by the microphone array 11 is likely to be a conversation sound (including a speech sound for speech recognition).
Correspondingly, the sound level of the correction sound acquired from the first sound acquisition direction is at least a predetermined first reference value higher than the sound level of the correction sound previously acquired from the same first sound acquisition direction. If it has increased (or has increased), it is determined that the occupant is talking, and the output level of the output sound of the audio device 2 drops to a predetermined first reference output level that does not hinder the conversation. (Suppression processing). Note that the acoustic device 2
When the output level is originally lower than the first reference output level, the suppression processing is not performed.

In the state where the above-mentioned suppression processing is being performed by the optimum sound volume value calculating section 17, the increase in the sound level of the corrected sound obtained from the first sound obtaining direction from the previous time is the first sound. When the value falls below the reference value, it is determined that the conversation by the occupant has ended, and the output level of the output sound of the acoustic device 2 returns to the output level before the suppression processing by the optimum sound volume value calculation unit 17 is performed. (First return processing).

Further, since the corrected sound acquired from the second sound acquisition direction by the microphone array 11 is likely to be noise other than the conversation sound, the second sound acquisition direction is correspondingly changed. The sound level of the corrected sound acquired from the second sound acquisition direction increases from the same second sound acquisition direction by a predetermined second reference value or more than the sound level of the previously acquired corrected sound (or increases). Is determined to be loud, and the output level of the output sound of the audio device 2 is raised to a predetermined second reference output level at which the recovery of the listening feeling impaired by the noise can be expected (enlargement). processing). If the output level of the sound device 2 is originally equal to or higher than the second reference output level, the enlargement processing is not performed.

In the state where the above-described enlargement processing is being performed by the optimum sound volume value calculating section 17, the increase in the sound level of the corrected sound obtained from the second sound obtaining direction from the previous time is the second sound level. When the noise level falls below the reference value, it is determined that the noise has decreased, and the output level of the output sound of the audio device 2 is restored to the output level before the enlargement process is performed by the optimal volume value calculation unit 17 ( Second return processing).

When the above-described suppression processing and the enlargement processing for the output level of the audio device 2 by the optimum sound volume value calculation unit 17 compete with each other, the suppression processing is prioritized from the viewpoint of securing a good conversation environment. .

In the present embodiment, the sound volume is adjusted based on the increase in the sound level of the corrected sound acquired from each sound acquisition direction from the previous acquisition. However, the corrected sound acquired from each sound acquisition direction is adjusted. The sound volume may be adjusted based on whether or not the sound level exceeds a predetermined reference level.

As described above, according to the present embodiment, when the conversation sound of the occupant is detected via the microphone array 11, the output level of the sound output of the acoustic device 2 does not hinder the conversation. While being automatically reduced to a predetermined first reference output level (suppression processing),
Since the output level of the sound device 2 is automatically returned to the state before the suppression processing with the end of the conversation,
The output level of the audio device 2 can be automatically adjusted to an appropriate value that does not cause an obstacle such as conversation of the passenger.

When noise of a certain level or more, which is noise other than conversation sound in the vehicle interior, is detected via the microphone array 11, the output level of the output sound of the acoustic device 2 is impaired by the noise. The level is automatically increased to a predetermined second reference output level at which the recovery of the sense of hearing can be expected (enlargement processing), and when the noise is reduced, the output level of the audio device 2 is returned to the state before the enlargement processing. Since the automatic recovery is performed, the output level of the acoustic device 2 can be automatically adjusted to an appropriate value according to the noise environment in the vehicle compartment.

Further, since the microphone array 11 used as the sound acquisition means has a variable sound acquisition direction,
By adjusting the directivity of the microphone array 11, the sound acquisition direction can be easily adapted to the direction in which various sounds should be acquired in the vehicle cabin, and conversation sound, vehicle interior noise, and the like can be accurately acquired. it can.

In this embodiment, the microphone array 11 is used as the sound acquisition means. However, a plurality of ordinary microphones having directivity of sound acquisition may be used as the sound acquisition means. In this case, each microphone is
The sound acquisition direction based on the directivity is set so as to face the assigned sound acquisition direction.

<Second Embodiment> FIG. 2 is a block diagram of a sound volume control device of an on-vehicle acoustic device according to a second embodiment of the present invention. The volume control device 1a according to the present embodiment is substantially different from the volume control device 1 according to the first embodiment in that a directional characteristic learning unit (sound acquisition direction setting unit) 1 is newly provided.
8 and points related thereto, and corresponding parts are denoted by the same reference numerals and description thereof is omitted.

In the volume control device 1a according to the present embodiment,
The directional characteristic calculating unit 13 further has a function of scanning the sound acquisition direction of the microphone array 11 within a predetermined range by controlling the microphone array control unit 12 according to a scanning instruction given from the directional characteristic learning unit 18. . When no scanning instruction is given from the directional characteristic learning unit 18, the directional characteristic calculation unit 13 sequentially sets the sound acquisition direction of the microphone array 11 in the first and second sound acquisition directions set above. Switch to.

The microphone array control unit 12
The sound signal of the sound acquired by the microphone array 11 from each sound acquisition direction is also output to the directivity learning unit 18.

The directional characteristic learning unit 18 includes the directional characteristic calculation unit 1
3 while scanning the sound acquisition direction of the microphone array 11 within a predetermined range by issuing a scan instruction to the microphone array 3 and acquiring the sound signal of the sound acquired by the microphone array 11 from each sound acquisition direction via the microphone array control unit 12. Then, the sound acquisition direction in which the increase in the volume of the sound indicated by the sound signal from the same sound acquisition direction from the previously acquired sound volume is equal to or more than a third predetermined reference value corresponding to the conversation sound is determined. The directional characteristic calculation unit 13 is instructed (set instruction) to set the above-described first sound acquisition direction for sound acquisition, and the setting content is updated. The first sound acquisition direction thus set may be one or plural. If the direction in which the increase in the volume of the acquired sound from the previous acquisition exceeds the third reference value is continuously distributed within a predetermined angle range, the direction within the angle range The direction in which the amount of increase from the previous acquisition is largest is set as the first sound acquisition direction.

After the setting instruction is given, the first sound acquisition direction designated by the setting instruction and the second preset sound are set until the setting contents are updated by the next setting instruction. The sound acquisition direction of the microphone array 11 is sequentially switched between the sound acquisition direction and the sound acquisition direction.

In this embodiment, the first sound acquisition direction is set based on the increase in the volume of the sound acquired from each sound acquisition direction from the previous acquisition. The setting of the first sound acquisition direction may be performed based on whether or not the volume of the acquired sound is higher than a predetermined reference level.

With such a configuration, at the initial setting stage, the first sound acquisition direction for acquiring the consonant of the microphone array 11 is not set to the direction corresponding to the seating position (seat position) in the vehicle interior. In both cases, when the conversation by the occupant starts, the direction of the sound source of the conversation sound is detected by scanning control via the directional characteristic calculating unit 13 and the microphone array control unit 12 by the directional characteristic learning unit 18, and the direction corresponding to the speaker is detected. The first sound acquisition direction is set as the direction so that the conversation sound can be acquired accurately.

Further, since the first sound acquisition direction is automatically and periodically updated, even if the occupant's seating position or seat position is changed, the first sound acquisition direction is automatically updated. The optimal direction is set.

As described above, according to the present embodiment, the directivity of the microphone array 11 is
1 can be automatically adapted to the direction of the speaker in accordance with the installation position of the vehicle 1 and the seating position (or seating position) of the occupant in the vehicle interior, and manual adjustment of the directivity of the microphone array 11 is substantially unnecessary. can do.

<Third Embodiment> FIG. 13 is a block diagram of a speech recognition apparatus according to a third embodiment of the present invention. As shown in FIG. 3, the voice recognition device 3 according to the present embodiment includes a volume control device 1 according to the first embodiment and a voice recognition unit (voice recognition unit).
4 is provided. The volume control device 1
Is substantially the same as that of the first embodiment, and the description is omitted. However, in the case of the present embodiment, the microphone array control unit 12 also outputs the sound signal of the sound acquired by the microphone array 11 from each sound acquisition direction to the speech recognition unit 4 for speech recognition. As a modification of the present embodiment, the voice recognition unit 4 may be provided with a unique microphone (sound acquisition unit) for receiving a voice input.

The voice recognition unit 4 performs voice recognition processing based on the sound signal given from the microphone array control unit 12, and recognizes the input content when voice input is performed. The recognition result of the voice recognition unit 4 is output to another in-vehicle device (such as a navigation device).

As described above, according to the present embodiment, when a conversation or voice input is being performed by a passenger,
Since this is detected by the volume control device 1 and the volume of the sound device 2 is automatically reduced,
It is possible to improve the recognition rate of the input content of the voice input by the voice recognition unit 4 and the accuracy of identifying whether the input is a normal conversation or a voice input.

In the present embodiment, the voice recognition device 3 is configured using the volume control device 1 according to the first embodiment. However, the voice recognition device is configured using the volume control device 1a according to the second embodiment. May be.

[0048]

According to the first aspect of the present invention, the sound acquisition direction is set to a direction corresponding to at least one seating position in the vehicle interior in accordance with an increase in the volume of the sound acquired by the sound acquisition means. Since the volume of the on-vehicle audio device is reduced, the volume of the on-vehicle audio device can be automatically adjusted to an appropriate value that does not hinder the conversation or the like of the occupant.

According to the second aspect of the present invention, while the volume of the on-vehicle acoustic device is decreased in accordance with the increase in the volume of the sound from the first sound acquisition direction detected by the sound acquisition means, the sound acquisition is performed. The volume of the on-vehicle acoustic device is increased in accordance with an increase in the volume of the sound from the second sound acquisition direction detected by the means, and corresponds to a direction other than the seating position of the sound acquisition means in the passenger compartment. Since the volume of the sound acquired from the second sound acquisition direction set as described above often reflects the loudness of vehicle interior noise other than the conversation sound of the passenger, the presence or absence of conversation of the passenger In addition, the sound volume of the on-vehicle acoustic device can be automatically adjusted to an appropriate value according to the noise environment in the vehicle cabin.

According to the third aspect of the present invention, since the microphone array used as the sound acquisition means has a variable sound acquisition direction, the sound acquisition direction is adjusted by adjusting the directivity of the microphone array. Can easily be adapted to the direction in which various sound acquisitions should be performed,
It is possible to accurately acquire conversation sounds, vehicle interior noise, and the like.

According to the fourth aspect of the present invention, the sound acquisition direction setting means detects the sound volume of the sound acquired by the microphone array while changing the sound acquisition direction of the microphone array, and increases the volume or volume of the sound. Is set as a first sound acquisition direction for conversational sound acquisition, the sound acquisition direction of which is equal to or higher than a predetermined reference level corresponding to the conversational sound.
It is possible to automatically adapt to the direction of the speaker in accordance with the installation position of the sound acquisition means and the seating position (or seat position) of the occupant in the passenger compartment, and the manual adjustment of the directivity of the sound acquisition means is substantially achieved. It can be unnecessary.

According to the fifth aspect of the present invention, when a conversation or voice input is being performed by a passenger, the fact is detected via the sound acquisition means, and the volume of the on-vehicle acoustic device is automatically adjusted. Therefore, it is possible to improve the recognition rate of the input content of the voice input by the voice recognition means and the accuracy of discriminating between the normal conversation and the voice input.

[Brief description of the drawings]

FIG. 1 is a block diagram of a volume control device of an in-vehicle acoustic device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a volume control device of an on-vehicle acoustic device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a voice recognition device according to a third embodiment of the present invention.

[Explanation of symbols]

 1, 1a Volume control device 2 In-vehicle acoustic device 3 Voice recognition device 4 Voice recognition unit 11 Microphone array 12 Microphone array control unit 13 Directivity characteristic calculation unit 14 Sound signal level analysis unit 15 Signal processing unit 16 Voice power calculation unit 17 Optimum volume value Calculation unit 18 Directivity characteristic learning unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akinori Usami 1-10-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in the Auto Network Engineering Laboratory Co., Ltd. (Reference) 3D020 BA02 BA10 BA11 BB01 BC01 BD03 BE03 5D015 DD02 KK01 5D020 BB04 BB08

Claims (5)

[Claims] 1. A sound volume control device for an on-vehicle audio device for adjusting the volume of an on-vehicle audio device, the device being installed at a predetermined installation position in a vehicle cabin of a vehicle, having a directivity of sound acquisition, and having a directivity. A sound acquisition unit in which a sound acquisition direction is set to a direction corresponding to at least one seating position in the vehicle interior; and decreasing the volume of the on-vehicle acoustic device according to an increase in volume of the sound acquired by the sound acquisition unit. Volume control means for a vehicle-mounted acoustic device, comprising: volume control means. 2. The sound acquisition unit according to claim 1, wherein the first sound acquisition direction is set corresponding to the at least one seating position, and the second sound acquisition direction is set to correspond to a direction other than the seating position in the vehicle interior. Has a switchable sound acquisition direction, the volume adjustment means decreases the volume of the on-vehicle acoustic device in accordance with an increase in the volume of sound from the first sound acquisition direction detected by the sound acquisition means. The on-vehicle acoustic device according to claim 1, wherein the volume of the on-vehicle acoustic device is increased in accordance with an increase in the volume of the sound from the second sound acquisition direction detected by the sound acquisition unit. Volume control device. 3. The volume control device for an on-vehicle acoustic device according to claim 1, wherein the sound acquisition unit is a microphone array whose sound acquisition direction is variable. 4. The sound volume control device of the on-vehicle acoustic device detects a sound volume of a sound acquired by the microphone array while changing the sound acquisition direction of the microphone array, and determines whether the increase amount or the sound volume is a conversation sound. The sound acquisition direction that is equal to or higher than a predetermined reference level corresponding to
4. The sound volume adjusting device for a vehicle-mounted acoustic device according to claim 3, further comprising a sound acquisition direction setting unit that sets the sound acquisition direction for the microphone array. 5. A voice recognition device using the volume control device of the vehicle-mounted acoustic device according to claim 1, wherein the volume of the vehicle-mounted audio device according to any one of claims 1 to 4. An input device of the sound input based on a sound input input via the sound acquisition unit of the sound volume adjustment device of the on-vehicle audio device or another sound acquisition unit provided in addition to the sound acquisition unit; And a voice recognition unit for recognizing a sound.