JP2008132927A - Sound output control device and vehicular navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound output control device and a vehicular navigation device which does not require preliminary connection of a telephone set or any registration of a wireless terminal, and capable of automatically silencing the sound output from a sound output device in a cabin or reducing the sound volume during the reception of the telephone set. <P>SOLUTION: The sound data of the differential sound except the background noise is generated by subtracting the sound waveform to be output from a sound control circuit 9 of a navigation device 1 and an audio device 15 from the sound waveform in a cabin input by microphones 10a-10d. The sound waveform data of the ring alert of a telephone set registered in an external memory 6 in advance is compared with the sound waveform data of the differential sound, and they are matched with each other, the navigation device 1 and the audio device 15 are set in a silenced state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sound output control device and a vehicle navigation device that mute or reduce the sound output from a sound output device when a telephone call arrives.

There is a hands-free system for a vehicle that enables a telephone call using the mobile phone without operating the mobile phone during driving of the vehicle. Patent Document 1 describes a hands-free system that mutes the output sound of an audio device when a mobile phone having a communication function based on BLUETOOTH (registered trademark) arrives. In relation to this, as a technique for controlling the output sound of the audio device, Patent Document 2 discloses a sound operation device that changes the volume of the reproduced sound in accordance with the noise sound pressure detected in the passenger compartment.
JP 2003-198713 A Japanese Patent Laid-Open No. 10-178324

  The hands-free system described in Patent Document 1 can operate without a direct connection between the mobile phone and the hands-free system. However, when the mobile phone is connected for the first time or when the target mobile phone is changed, It is necessary to search for and select a mobile phone. In other words, in the conventional system, the cellular phone and the hands-free system are connected via the in-vehicle LAN, or terminal registration of BLUETOOTH is required, and muting is performed except when a cellular phone that is already connected or registered as a wireless terminal is received. I couldn't.

  The present invention has been made in view of the above circumstances, and its purpose is to eliminate the need for prior connection of a telephone and registration of a wireless terminal, and automatically outputs sound output from a sound output device in a passenger compartment when a telephone is received. Another object is to provide an audio output control device and a vehicle navigation device that can mute or reduce the volume.

  According to the means described in claim 1, each device is configured based on the sound data obtained by collecting the sound in the vehicle interior and the sound data of the sound output from the sound output device. Generate audio data of differential audio excluding the output audio (background sound). In addition to the ringing tone of the telephone brought into the passenger compartment, the differential voice includes noise associated with traveling of the vehicle, sound coming from outside the vehicle, voice emitted from the passenger, and the like.

  The ringtone of the telephone brought into the passenger compartment is registered in advance in storage means such as a memory in the audio output control device or a server connected via a network. It is determined whether or not both voice data are matched based on the voice data of the differential voice and the ring tone voice data registered in advance, and if so, the voice output state of the voice output device is muted. Or it controls to a volume reduction state.

  According to this means, there is no need for wired connection of a telephone set brought into the vehicle interior, installation of wireless communication means such as BLUETOOTH in the telephone, pre-registration of wireless terminal means. In addition, if you register the ringtone of the phone in advance, you can control the mute (volume reduction) at the time of incoming call regardless of the phone connection standard, communication standard, number of carry-in, etc. Excellent extensibility.

  According to the means described in claim 2, the voice data is data composed of a voice waveform, and the difference voice is obtained by subtracting the waveform component of the voice output from the voice output device from the waveform component of the voice in the passenger compartment. Voice data is generated, and the voice waveform of the differential voice is compared with the voice waveform of the registered ringing tone to determine whether the voice data matches. This means can be applied to all telephones regardless of the type of ringtone.

  According to the means described in claim 3, the voice data of the differential voice is output through the high-pass filter having a cutoff frequency higher than the main frequency component of the in-vehicle noise accompanying the running of the vehicle. Since the ring tone is composed of a relatively high frequency sound so that a person can easily recognize it, the attenuation due to the provision of the high-pass filter is small. Since the waveform component of unnecessary in-vehicle noise is cut, the accuracy of the coincidence determination by the determination means can be increased.

  According to the means described in claim 4, the comparison processing is performed after the average waveform level of the sound data output from the background sound removing means and the average waveform level of the sound data input by the registered sound input means are adjusted to be equal. Since this is executed, it is possible to prevent incoming detection errors due to differences in levels as much as possible.

  According to the means described in claim 5, language information included in the ring tone is registered as voice data. Then, the language information is recognized from the differential voice, and the language information included in the differential voice is compared with the language information included in the registered ringtone to determine whether or not the two voice data match. For example, when the ringtone includes lyrics, words, etc., the incoming call detection accuracy can be increased.

  According to the means described in claim 6, the audio data of the audio output from the audio output device installed in the passenger compartment is input via the delay circuit, and the audio data of the differential audio is generated. The sound output from the sound output unit (speaker) into the vehicle interior reaches the sound input unit (microphone) with a slight delay. If a time corresponding to the delay time until the sound arrives is set in the delay circuit, the differential sound from which the background sound is erased can be obtained more reliably.

  According to the means described in claim 7, the plurality of voice input units are installed at different positions in the vehicle interior, and the voice data of the registered ringtone among the plurality of voice input units is the earliest and most The sound output from the vicinity of the installation position of the audio input unit input at a large level (via the audio output unit) is controlled to the mute state or the volume reduction state. This makes it possible to selectively control the volume according to the position of the caller in the cabin so that only the volume around the caller holding the incoming phone is reduced and the sound output around other passengers is maintained as much as possible. It becomes.

  According to the means described in claim 8, it is possible to actually ring the telephone ring tone in the passenger compartment and register the sound in the predetermined storage means.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram illustrating an electrical configuration of a vehicle navigation device and a connection state between the navigation device, an audio device, a speaker, and a microphone (microphone). The navigation device 1 includes a control circuit 2 mainly composed of a microcomputer, a position detector 3 for detecting the current position of the vehicle, a map data input device 4, an operation switch group 5, an external memory 6, a color liquid crystal display and the like. The display device 7, the voice control circuit 9 to which the speakers 8 (8 a to 8 d) are connected, the incoming call mute control circuit 11 that inputs the voice in the vehicle interior by the microphone 10 (10 a to 10 d) and executes the incoming call mute control, and the remote control 12. Remote control sensor 13 for transmitting and receiving commands and the like, and external information input / output device 14 for transmitting and receiving data to and from the outside (for example, an information center equipped with a server) by wireless communication. The incoming call mute control circuit 11 is connected to an audio device 15 (corresponding to an audio output device) such as a CD / DVD playback device, an MD playback device, or a radio reception device provided in the passenger compartment.

  FIG. 3 shows an arrangement of the navigation device 1, the audio device 15, the speakers 8 a to 8 d (audio output unit), and the microphones 10 a to 10 d (corresponding to the audio input unit) in the vehicle interior. The navigation device 1 and the audio device 15 are accommodated in a center console in the vehicle interior. The speaker 8a and the microphone 10a are attached to the right front part of the vehicle interior, and the speaker 8b and the microphone 10b are attached to the left front part of the vehicle interior. The speaker 8c and the microphone 10c are attached to the right rear part in the vehicle interior, and the speaker 8d and the microphone 10d are attached to the left rear part in the vehicle interior.

  In the navigation device 1, the position detector 3 includes a gyroscope 16 that detects the rotational angular velocity of the vehicle, a distance sensor 17 that detects the travel distance of the vehicle, and a transmission radio wave from an artificial satellite as shown in FIG. A GPS receiver 18 for GPS (Global Positioning System) that detects (measures) the current position is included. The control circuit 2 detects the current position, traveling direction, speed, travel distance, current time, and the like of the vehicle with high accuracy by using the detected values of the sensors 16 to 18 while interpolating.

  The map data input device 4 is a map data recording medium that records various data such as road map data, landmark data, map matching data, destination data (facility database), and table data for converting traffic information into road data. It is comprised by the drive device for reading data from. As the map data recording medium, a large-capacity storage medium such as a DVD is generally used, but a medium such as a memory card or a hard disk device may be used.

  The road map data includes data such as road shape, road width, road name, signal, railroad crossing, building, various facilities, place name, terrain, etc., and for displaying the road map on the screen of the display device 7. Contains data. Destination data consists of information about transportation facilities such as stations, leisure facilities, accommodation facilities, public facilities, various stores such as retail stores, department stores, restaurants, residences, condominiums, and place names. The data includes data such as the telephone number, address, latitude and longitude, and data for displaying landmarks indicating facilities on the screen of the display device 7 on the road map. It is configured.

  The operation switch group 5 as input means is configured to include a mechanical switch provided in the vicinity of the screen of the display device 7 and a touch panel provided on the screen of the display device 7. A user (driver) uses the operation switch group 5 to input a destination or information necessary for searching for a destination (destination search condition), and to enter a mobile phone 19 (see FIG. 3) brought into the passenger compartment. Various commands for registering a ringtone and switching the screen and display mode of the display device 7 (map scale change, menu display selection, route search, route guidance start, volume adjustment, volume mute, etc.) are input. The remote controller 12 is provided with a plurality of operation switches, and various command signals are transmitted from the remote controller 12 to the control circuit 2 via the remote controller sensor 13 by the switch operation. Note that the operation switch group 5 and the remote controller 12 can cause the control circuit 2 to execute the same function by any operation.

  The external memory 6 (corresponding to storage means) is composed of a flash memory card or the like. The external memory 6 stores specific data such as route data to the destination set by the control circuit 2 at the time of route guidance, route data through which the vehicle has passed, voice data of the ring tone of the mobile phone 19, and the like. .

  On the screen of the display device 7, a map around the position of the vehicle is displayed at various scales, and a current location mark (pointer) indicating the current position and the traveling direction of the vehicle is displayed superimposed on the display. In addition, a route guidance screen is displayed when route guidance to the destination is executed. In addition, an input screen for the user to input information necessary for searching for a destination, searching for and setting a destination, and a guidance message for registering a ring tone of the mobile phone 19 are also displayed. The

  As shown in FIG. 2, the audio control circuit 9 receives an audio data corresponding to the output audio from the external memory 6 based on an audio output command from the control circuit 2, and generates an audio signal. The amplifier 9b amplifies the audio signal and outputs it to the speakers 8a to 8d. Voices output from the speakers 8a to 8d via the voice control circuit 9 are voices related to guidance, voices related to operation explanations, talkback voices according to the voice recognition results, and the like. When the audio control circuit 9 and the audio device 15 receive the mute command signal Sm from the incoming mute control circuit 11, the audio control circuit 9 and the audio device 15 stop the audio output signals to the speakers 8a to 8d and put them in a mute state.

  The incoming call mute control circuit 11 (corresponding to a sound output control device) is stored (registered) in advance in the sound data of the in-vehicle sound input via the microphones 10a to 10d and the external memory 6 or the memory 20 (corresponding to storage means). The voice data of the ringtone of the mobile phone 19 and the voice data of the voice output from the voice control circuit 9 and the audio device 15 are input, and when the ringtone of the mobile phone 19 sounds, the navigation device 1 and the audio device 15 outputs a mute command signal Sm.

  FIG. 2 is an electrical block diagram of the incoming call mute control circuit 11. The incoming call mute control circuit 11 includes an interior sound input circuit 21, an interface circuit 22, an audio signal input circuit 23 (23a, 23b), a subtraction circuit 24, a comparison circuit 25, a volume control circuit 26, and an audio data generation circuit 27. Yes. Since four speakers 8a to 8d and microphones 10a to 10d are arranged in the vehicle interior, these circuits are provided for four channels.

  The in-vehicle sound input circuit 21 (corresponding to in-vehicle sound input means) A / D-converts the sound signal in the vehicle interior inputted via the microphones 10a to 10d by the A / D converter 28, and converts the sound data composed of the sound waveform. To get. The audio signal input circuits 23a and 23b (corresponding to background sound input means) respectively input (electrical) audio signals output from the amplifier 9b and the audio device 15 of the audio control circuit 9, and input the delay circuits 29a and 29b. And output as voice data consisting of voice waveforms. The delay time of the delay circuit 29 (29a, 29b) is set equal to the time until the sound output from the speaker 8 into the vehicle interior reaches the microphone 10.

  The subtracting circuit 24 (corresponding to background sound removing means) is composed of a subtracter 30 and a filter circuit 31. The subtractor 30 calculates a difference between the sound data (waveform component) of the vehicle interior sound input by the vehicle interior sound input circuit 21 and the sound data (waveform component) of the background sound output from the sound signal input circuit 23, The audio data of the differential audio is output via the filter circuit 31. The filter circuit 31 is a high-pass filter having a cut-off frequency higher than the main frequency component of in-vehicle noise accompanying the traveling of the vehicle.

  The voice data generation circuit 27 is used when registering the voice data of the ringtone of the mobile phone 19. The voice data generation circuit 27 stores predetermined information (sound data registration date, portable data) in the voice data of the in-vehicle sound output from the subtraction circuit 24. The identification information (call number) of the telephone 19 is added. The interface circuit 22 (corresponding to registration sound input means and registration means) reads the voice data of the ring tone of the mobile phone 19 from the external memory 6 (or memory 20) in the normal mode, and the voice data generation circuit 27 in the registration mode. Is written into the external memory 6 (or memory 20).

  The comparison circuit 25 (corresponding to the determination means) is a level for adjusting the level so that the average waveform level of the audio data output from the subtraction circuit 24 is equal to the average waveform level of the audio data read through the interface circuit 22. An adjustment circuit 32 (corresponding to level adjustment means) is provided. The comparison circuit 25 determines whether or not the audio waveforms match by comparing the audio data whose levels have been adjusted, and outputs the result to the volume control circuit 26 (corresponding to the volume control means). When receiving the coincidence signal of the audio data from the comparison circuit 25, the volume control circuit 26 outputs a mute command signal Sm to the amplifier 9b and the audio device 15 of the audio control circuit 9.

  The microcomputer constituting the control circuit 2 of the navigation device 1 includes a CPU, a memory (RAM, ROM, EEPROM, flash memory, etc.), an I / O, and the like. Among these, the memory 20 is an electrically rewritable non-volatile memory such as an EEPROM or a flash memory, and can store the voice data of the ring tone of the mobile phone 19 as described above. When the CPU executes a program stored in the ROM (or flash memory), the control circuit 2 can perform destination setting means, route search means, display control means, route guidance means, passage route specification means, function control means, Functions as current position correction means. Even when the incoming mute control circuit 11 is configured to perform software processing, the CPU executes the processing.

  The function as a route search means is to automatically calculate a recommended travel route from the departure point of the vehicle to the destination. The function as route guidance means is to display a road map around the current location on the screen of the display device 7 so as to be movable along the travel route, and to display a current location mark indicating the current position and traveling direction of the vehicle on the road This is a function to display it superimposed on the map.

  Next, the incoming call mute function and the incoming call tone registration function of the navigation device 1 will be described with reference to the flowchart shown in FIG. The incoming call mute process (steps S1 to S9) and the incoming call tone registration process (steps S10 to S13) shown in this flowchart are executed by the incoming call mute control circuit 11. Also, the sound data of the ring tone is stored (registered) in the external memory 6. The voice data of the ringtone is voice waveform data and is stored in a format such as wma, wav, mp3, for example.

  The incoming call mute control circuit 11 includes the sound data of the vehicle interior sound output from the A / D converter 28 of the vehicle interior sound input circuit 21 and the sound data output from the audio signal input circuits 23a and 23b (the amplifier 9b and the audio device 15). The output audio signal) is stored in the RAM for a predetermined time (steps S1 and S2).

  The subtracting circuit 24 subtracts the background sound data (waveform component) from the stored in-vehicle sound data (waveform component) to generate differential sound data (step S3). A running noise removal process is executed by the filter circuit 31 (step S4). Thereafter, it is determined whether the mode is the normal mode or the registration mode (step S5).

  In the normal mode, the voice data of the ringing tone of the mobile phone 19 is read from the external memory 6 to the RAM via the interface circuit 22 (step S6). This reading may be performed before step S1. The level adjustment circuit 32 adjusts the level so that the average waveform level (sound pressure level) of the voice data of the differential voice and the voice data of the ringing tone read from the external memory 6 becomes equal, and the comparison circuit 25 adjusts the level. The voice data are compared (step S7).

  This comparison process is performed by extracting the characteristics of the waveforms of both audio data and obtaining the degree of coincidence based on the characteristics, or obtaining the degree of coincidence between the waveforms while sequentially shifting the timing of both audio data. If the two audio waveforms match (step S8; YES), the volume control circuit 26 outputs a mute command signal Sm according to the match signal from the comparison circuit 25 (step S9), and the two audio waveforms do not match. In the case (step S8; NO), the process returns to step S1 without outputting the mute command signal Sm.

  When receiving the coincidence signal of the voice data from the comparison circuit 25, the volume control circuit 26 is arranged around the position of the microphone 10 (any one of 10a to 10d) that has inputted the voice data of the ringing tone at the earliest and highest level. The mute command signal Sm is output to the amplifier 9b and the audio device 15 that drive the speaker 8 (any of 8a to 8d). As a result, when the mobile phone 19 in which the ring tone is registered arrives, only the sound output (guidance voice, playback voice, broadcast voice) around the position of the mobile phone 19 (that is, the caller's position) is muted. The sound output around other occupants is maintained as it is.

  Prior to using this incoming call mute function, the user registers the audio data of the incoming call sound of the mobile phone 19 brought into the vehicle compartment in the external memory 6. This ringing tone is registered by shifting to the registration mode using the operation switch group 5 or the remote controller 12 (step S5; YES). When the registration mode is entered, the incoming call mute control circuit 11 executes a ring tone registration process shown in steps S10 to S13.

  When a predetermined registration start operation is performed with the ring tone of the cellular phone 19 ringing in the vehicle interior, the audio data generation circuit 27 sequentially stores the audio data of the differential audio output from the subtraction circuit 24 in the RAM (step). S10). When a predetermined registration end operation is performed (step S11; YES), the sound data generation circuit 27 writes the sound data stored in the RAM to the external memory 6 (step S12), and then returns to the normal mode (step S13). . A plurality of audio data can be registered in the external memory 6, and as described above, the date of registration, identification information (call number) of the mobile phone 19, etc. can be added to each audio data. The audio data generation circuit 27 can edit and delete the audio data designated by these additional information.

  According to the embodiment described above, by registering in advance the ring tone of the mobile phone 19 brought into the vehicle interior, when the mobile phone 19 receives an incoming call in the vehicle interior (when the ring tone sounds), The sound output from the navigation device 1 and the audio device 15 through the speaker 8 is automatically muted. In this case, only the sound from the speaker 8 arranged around the incoming mobile phone 19 is selectively muted, so that the caller can easily talk and the passenger other than the caller can continue to listen to the sound. it can.

  In the present embodiment, it is not necessary to connect the mobile phone 19 brought into the passenger compartment to the navigation device 1 with a cable, and the mobile phone 19 is equipped with a short-range wireless communication unit such as BLUETOOTH, pre-registration of the wireless communication unit, etc. It becomes unnecessary. Further, regardless of the connection standard, communication standard, number of carry-in, etc. of the mobile phone 19, the incoming call mute control can be performed with any mobile phone 19.

  Since the comparison circuit 25 determines whether or not a registered ringtone exists in the inputted voice in the vehicle interior based on the voice data including the voice waveform, the type of the ringtone (pattern sound, melody, chime) is determined. It can be applied to the mobile phone 19 having various ringtones regardless of lyrics, words, etc.).

  The subtraction circuit 24 includes a filter circuit 31 for differential sound obtained by subtracting background sound from in-vehicle sound. Since this filter circuit 31 has a cut-off frequency higher than the main frequency component of the in-vehicle noise accompanying the traveling of the vehicle, the waveform component of the in-vehicle noise is removed from the differential voice, and the accuracy of the incoming call determination in the comparison circuit 25 Will improve. Since the ring tone is composed of a relatively high frequency sound so that a person can easily recognize it, the attenuation by the filter circuit 31 that cuts off in-vehicle noise having a relatively low frequency component is small.

  The comparison circuit 25 adjusts the level so that the average waveform level (sound pressure level) of the differential voice data and the read ringtone voice data is equal, and then compares the voice data with each other. It is possible to prevent erroneous determination of incoming calls.

  The audio signal input circuit 23 causes the delay circuit 29 to delay the signal by the time required for the sound output from the speaker 8 to the vehicle interior to reach the microphone 10, so that the amplifier 9 b and the audio device 15 of the audio control circuit 9 are delayed. The audio signal from is input. Thereby, the background sound can be surely erased from the input in-vehicle sound.

(Second Embodiment)
FIG. 5 is a block diagram of an incoming call mute control circuit according to the second embodiment of the present invention. The same parts as those in FIG. The incoming call mute control circuit 33 includes a voice recognition circuit 34 between the subtraction circuit 24 and the comparison circuit 25. A speech recognition circuit 34 (corresponding to speech recognition means) recognizes language information (lyrics, words, etc.) included in the differential speech output from the subtraction circuit 24. Note that the level adjustment circuit 32 is not necessary for the comparison circuit 25.

  In the case of the registration mode, the user performs a predetermined registration start operation in a state where a ringing tone of the mobile phone 19 (for example, a voice that repeats the phrase “phone call”) is sounded in the passenger compartment. The voice data generation circuit 27 writes the linguistic information recognized by the voice recognition circuit 34 during the period from the registration start operation to the registration end operation (a code corresponding to the word “phone phone”) in the external memory 6. On the other hand, in the normal mode, the comparison circuit 25 compares the language information recognized by the voice recognition circuit 34 with the language information of the ringtone read from the external memory 6. If the linguistic information (the word “phone is”) matches, the volume control circuit 26 outputs a mute command signal Sm.

  According to the present embodiment, the voice data is composed of language information, and language information (lyrics, words, etc.) included in the ring tone of the mobile phone 19 is recognized by the voice recognition circuit 34, and the recognized language information is used. It is determined that the mobile phone 19 has received an incoming call (ringing sound has been heard) in the passenger compartment. This embodiment is effective when language information is included in the ringtone, and the same effects as those of the first embodiment can be obtained. Further, when used in combination with the first embodiment in which voice data is waveform data, mute control at the time of incoming call can be performed regardless of the presence or absence of language information included in the ring tone.

(Other embodiments)
The present invention is not limited to the embodiments described above and shown in the drawings, and can be modified or expanded as follows, for example.
The volume control circuit 26 may output a mute command signal Sm for reducing the volume instead of the mute command signal Sm for setting the mute state. In this case, the volume of the sound output from the navigation device 1 and the audio device 15 through the speaker 8 is decreased by a predetermined amount.

The mute state can be released by performing a predetermined release operation using the operation switch group 5 or the remote controller 12.
When receiving the coincidence signal of the audio data from the comparison circuit 25, the volume control circuit 26 may output a mute command signal Sm to all the amplifiers 9b and the audio device 15 that drive the speakers 8a to 8d.

Incoming call mute control can be executed in the same manner not only for mobile phones but also for phones installed in vehicles.
The delay circuit 29 or the filter circuit 31 may be provided as necessary.
The audio output device referred to in the present invention includes a back guide monitor, an ETC in-vehicle device, and the like.

The interface circuit 22 registers the sound data of the ring tone in the server of the information center via the external information input / output device 14 and inputs the sound data of the ring tone from the information center via the external information input / output device 14. You may comprise as follows.
The incoming call mute control circuit 11 may be configured as an audio output control device independent of the vehicle navigation device.

The block diagram of the navigation apparatus for vehicles which shows the 1st Embodiment of this invention. Electrical block diagram of incoming mute control circuit Arrangement of speakers, microphones, etc. in the passenger compartment Flowchart showing incoming mute processing and ringtone registration processing FIG. 2 equivalent view showing the second embodiment of the present invention

Explanation of symbols

  1 is a vehicle navigation device, 6 is an external memory (storage means), 10, 10a to 10d are microphones (audio input units), 11 and 33 are incoming mute control circuits (audio output control devices), and 15 is an audio device (audio). Output device), 19 a mobile phone (telephone), 20 a memory (storage means), 21 an in-car sound input circuit (in-car sound input means), 22 an interface circuit (registered sound input means, registration means), 23, 23a , 23b is an audio signal input circuit (background sound input means), 24 is a subtraction circuit (background sound removal means), 25 is a comparison circuit (determination means), 26 is a volume control circuit (volume control means), 29, 29a, 29b Is a delay circuit, 31 is a filter circuit (high-pass filter), 32 is a level adjustment circuit (level adjustment means), and 34 is a voice recognition circuit (voice recognition means).

Claims (9)

In-vehicle sound input means for inputting sound in the vehicle interior and generating the sound data;
Registered sound input means for inputting voice data of a ring tone pre-registered for the telephone;
Background sound input means for inputting sound data of sound output from the sound output device installed in the vehicle interior;
Based on the voice data input by the vehicle interior sound input means and the voice data input by the background sound input means, the difference voice obtained by removing the voice output from the voice output device from the voice in the vehicle interior. Background sound removal means for generating sound data;
Determining means for determining whether or not the two sound data match based on the sound data of the differential sound output from the background sound removing means and the sound data of the ringtone input by the registered sound input means;
A sound output control device comprising: a sound volume control means for controlling the sound output state of the sound output device to a mute state or a sound volume reduction state when the determination means determines that they match. The voice data is voice waveform data,
The background sound removing means generates the audio data of the differential audio by subtracting the waveform component of the audio output by the audio output device from the waveform component of the audio in the vehicle interior,
2. The voice output control apparatus according to claim 1, wherein the determination unit determines whether voice data matches by comparing the voice waveform of the differential voice with the voice waveform of the registered ringtone.   The background sound removing means includes a high-pass filter having a cutoff frequency higher than a main frequency component of in-vehicle noise accompanying traveling of the vehicle, and outputs the audio data of the differential sound through the high-pass filter. Item 3. The audio output control device according to Item 2.   The determination means includes level adjustment means for adjusting the average waveform level of the audio data output from the background sound removal means and the average waveform level of the audio data input from the registered sound input means, and the level adjustment 4. The audio output control apparatus according to claim 2, wherein the comparison process is performed on the audio data level-adjusted by the means. Voice recognition means for recognizing language information included in the differential voice output from the background sound removal means,
The registered sound input means inputs voice data representing language information included in the ringtone,
2. The determination unit according to claim 1, wherein the language information recognized by the voice recognition unit and the language information included in the ringtone are compared to determine whether or not the two voice data match. Voice output control device.   6. The audio output control apparatus according to claim 1, wherein the background sound input means inputs the audio data via a delay circuit. The vehicle interior sound input means is composed of a plurality of audio input units installed at different positions in the vehicle interior,
The volume control means is configured to mute the sound output from the vicinity of the installation position of the voice input unit that has input the voice data of the registered ringtone at the earliest and highest level among the plurality of voice input units, or The sound output control device according to claim 1, wherein the sound output control device controls the sound volume to be reduced.   8. The apparatus according to claim 1, further comprising registration means for registering voice data input from the in-vehicle sound input means in a predetermined storage means as voice data of the ringing tone of the telephone. Voice output control device.   A vehicle navigation apparatus comprising the audio output control apparatus according to any one of claims 1 to 8.

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