JP2019001313A - In-vehicle call device, in-vehicle call system, and control method for in-vehicle call - Google Patents

Abstract

To allow a voice of a speaking person outside a vehicle to be discriminated easily in an in-vehicle call system for outputting a voice of a speaking person in the vehicle and the voice of the speaking person outside the vehicle with a loudspeaker provided in the vehicle.SOLUTION: An in-vehicle call device that is connected to a microphone and a loudspeaker provided in a vehicle includes: a first control part for controlling an in-vehicle call for causing a voice in the vehicle acquired with the microphone to be output from the loudspeaker, a second control part for causing a voice outside the vehicle acquired outside the vehicle to be output from the loudspeaker, and a change part for executing change processing for changing quality of the voice outside the vehicle output from the loudspeaker to quality different from that of the voice in the vehicle when the in-vehicle call is executed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-car call device, an in-car call system, and an in-car call control method.

  For example, in a vehicle with a large number of seats, such as a minivan, noise during traveling may be added to the conversation between passengers with separated seats, and it may be difficult to transmit each other's voice. In order to compensate for this, it is possible to easily communicate between passengers by acquiring sound in the vehicle with a microphone provided in the vehicle and outputting the acquired sound in the vehicle with a speaker provided in the vehicle. An in-car call system has been put into practical use.

  For example, a vehicle call device that enables conversation between a front seat person and a back seat person such as a vehicle, or an outside person and an inside person using a vehicle-mounted telephone is known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2003-125068

  As described above, in an in-car call in which the sound acquired by the microphone provided in the vehicle is output by the speaker provided in the vehicle, the voice of each speaker is output through the speaker. It may be difficult to identify who the speaker is.

  In particular, when voice communication is started with a communication terminal outside the vehicle during an in-car call and the voice of a speaker outside the vehicle is added, whether the speaker of the voice output from the speaker is a speaker inside the car, It may not be possible to identify the speaker, and the conversation may be confused.

  An embodiment of the present invention has been made in view of the above-described problems, and outputs a voice of a speaker inside a vehicle and a voice of a speaker outside the vehicle with a speaker provided in the vehicle. In a call system, the voice of a speaker outside the vehicle can be easily identified.

  In order to solve the above-described problem, an in-car call device according to an embodiment of the present invention is an in-car call device connected to a microphone and a speaker provided in a vehicle, and the in-vehicle call device obtained by the microphone A first control unit that controls in-car calls for outputting sound from the speaker, a second control unit for outputting sound outside the vehicle acquired outside the vehicle from the speaker, and the in-car call is performed. And a changing unit that executes a changing process for changing the sound quality of the sound outside the vehicle to be output from the speaker to a sound quality different from the sound inside the vehicle.

  According to an embodiment of the present invention, in an in-car call system that outputs a voice of a speaker inside a vehicle and a voice of a speaker outside the vehicle with a speaker provided in the vehicle, the voice of a speaker outside the vehicle can be easily obtained. Can be discriminated.

It is a figure which shows the example of a structure of the in-vehicle call system which concerns on 1st Embodiment. It is a figure which shows another structural example of the in-vehicle call apparatus which concerns on 1st Embodiment. It is FIG. (1) which shows the image of a process of the in-vehicle call system which concerns on 1st Embodiment. It is FIG. (2) which shows the image of a process of the in-vehicle call system which concerns on 1st Embodiment. It is a figure which shows the structural example of the sound quality change part which concerns on 1st Embodiment. It is a figure which shows the example of the attenuation coefficient (alpha) which concerns on 1st Embodiment. It is a figure which shows the image of the audio | voice compression which concerns on 1st Embodiment. It is a flowchart which shows the example of the change process of the sound quality which concerns on 1st Embodiment. It is a figure which shows the image of the display screen which concerns on 1st Embodiment. It is FIG. (3) which shows the image of a process of the in-vehicle call system which concerns on 1st Embodiment. It is a figure which shows the example of a structure of the in-vehicle call system which concerns on 2nd Embodiment. It is a flowchart which shows the example of the change process of the sound quality which concerns on 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

[First Embodiment]
<Configuration of in-car call system>
FIG. 1 is a diagram illustrating an example of a configuration of an in-car call system according to the first embodiment. The in-car call system 100 includes one or more speakers 102-1, 102-2,..., One or more microphones 103-1, 103-2,. And an in-car communication device 110. In the following description, “speaker 102” is used to indicate an arbitrary speaker among the one or more speakers 102-1, 102-2,. Similarly, when an arbitrary microphone is shown among the one or more microphones 103-1, 103-2,..., “Microphone 103” is used.

  The in-car call system 100 includes, for example, a display input unit 104 that displays an operation screen or the like and accepts an occupant's operation, and an audio amplifying unit 105 that amplifies an audio signal output from the speaker 102.

  The in-car call device 110 includes an in-car call control unit 120 and a hands-free call control unit 130, and is connected to a microphone 103 and a speaker 102 provided in the vehicle 101.

  The in-car call control unit (first control unit) 120 makes an in-car call that facilitates conversation between passengers in the vehicle 101 by causing the speaker 102 to output the sound in the vehicle 101 acquired by the microphone 103. Control. For example, the in-car call control unit 120 outputs the voice acquired by the microphone 103 provided in the front seat of the vehicle 101 from the speaker 102 provided in the rear seat, thereby uttering the speech of the passenger in the front seat. Control so that passengers can easily hear. Similarly, the in-car call control unit 120 outputs the voice acquired by the microphone 103 provided in the rear seat of the vehicle 101 from the speaker 102 provided in the front seat, thereby uttering the utterance of the passenger in the rear seat. It can also be controlled so that a passenger in the seat can easily hear.

  In addition, the in-car call control unit 120 according to the present embodiment causes the speaker 102 to output the received voice 112 of voice communication output from the hands-free call control unit 130.

  The in-car call control unit 120 is realized by, for example, a program executed by a microcomputer (microcomputer) included in the in-car call control unit 120, an echo canceller 121, and the like.

  The echo canceller 121 is realized by, for example, a DSP (Digital Signal Processor) or the like, and executes signal processing such as echo cancellation processing that removes or suppresses acoustic echo that circulates from the speaker 102 to the microphone 103.

  The hands-free call control unit (second control unit) 130 uses the communication terminal 106 in the vehicle 101 to communicate with the communication terminal 108 outside the vehicle 101 via the communication terminal 106 and the communication network 107. Make a (hands-free call). Also, the hands-free call control unit 130 outputs the received voice 112 to the speaker 102 by outputting the received voice 112 of the voice communication to the in-car call control unit 120. The received voice 112 is an example of voice outside the vehicle 101 acquired outside the vehicle 101.

  The hands-free call control unit 130 is realized by, for example, a program executed by a microcomputer included in the hands-free call control unit 130, a noise canceller 131, a communication I / F unit 132, and the like.

  The noise canceller 131 removes noise components from the transmitted voice 111 output from the echo canceller 121. The noise canceller 131 is realized by, for example, a DSP or a dedicated integrated circuit.

  The communication I / F unit 132 is connected to a communication terminal 106 such as a smartphone or a mobile phone in the vehicle 101 by short-range wireless communication (or wired communication), and the vehicle is connected via the communication terminal 106 and the communication network 107. Voice communication is performed with a communication terminal (communication device) 108 outside 101. For example, the communication I / F unit 132 controls transmission and reception of voice communication with the communication terminal 108 outside the vehicle 101 according to a predetermined communication procedure. The communication I / F unit 132 transmits the transmission voice output from the noise canceller 131 to the communication terminal 108, and outputs the reception voice 112 transmitted from the communication terminal 108 to the in-car call control unit 120.

  In the example of FIG. 1, the echo canceller 121 includes a sound quality changing unit 140. When the in-car call is performed by the in-car call control unit 120, the sound quality changing unit (change unit) 140 is used to obtain the sound quality of the received voice 112 output from the hands-free call control unit 130 in the vehicle 101. A change process for changing to a sound quality different from that of the voice is executed.

  In the example of FIG. 1, the sound quality changing unit 140 is realized by the echo canceller 121 of the in-car call control unit 120. Note that the sound quality changing unit 140 may be realized outside the echo canceller 121.

  FIG. 2 is a diagram illustrating another configuration example of the in-vehicle communication device according to the first embodiment. For example, as illustrated in FIG. 2A, the sound quality changing unit 140 may be realized separately from the echo canceller 121 by, for example, a DSP that implements the echo canceller 121.

  For example, as shown in FIG. 2B, the sound quality changing unit 140 may be realized by a DSP provided in the hands-free call control unit 130, a dedicated integrated circuit, or the like. Here, as shown in FIG. 1, the following explanation will be given assuming that the sound quality changing unit 140 is realized by the echo canceller 121.

<Image of processing>
3 and 4 are diagrams illustrating an image of processing in the in-car call system according to the first embodiment. For example, as shown in FIG. 3, a passenger 301 is in the front seat A of the vehicle 101, a passenger 302 is in the front seat B, a passenger 303 is in the rear seat C, and a passenger 304 is in the rear seat D. To do.

  Further, as an example, when the in-car call is set to be valid (on), the in-car call control unit 120 acquires the voice uttered by the occupant 301 with the microphone 103-1, and from the speakers 102-1 and 102-2. It shall be output. Similarly, the in-car call control unit 120 acquires the voice spoken by the occupant 302 with the microphone 103-2 and outputs the voice from the speakers 102-1 and 102-2.

  As a result, the occupant 303 in the rear seat C and the occupant 304 in the rear seat D are uttered by the occupant 301 in the front seat A and the occupant in the front seat B. The utterance 302 can be heard clearly.

  In this state, for example, the hands-free call control unit 130 receives voice communication from the communication terminal 108 outside the vehicle, and the hands-free call is started. In this case, for example, as shown in FIG. 4, the in-car call device 110 outputs the incoming voice of hands-free call from the speakers 102-1 and 102-2.

  In this case, for example, the occupant 303 riding in the rear seat C determines whether the sound output from the speaker 102-1 is the sound uttered by the occupant 301, the sound uttered by the occupant 302, It is difficult to determine whether the sound is from the communication terminal 108.

  Therefore, the sound quality changing unit 140 according to the present embodiment converts the sound quality of the sound from the communication terminal 108 outside the vehicle (the sound outside the vehicle) into the microphone 103 in the vehicle when the in-car call is performed by the in-car call control unit 120. The sound quality is changed to a sound quality different from the sound acquired in step (the sound in the vehicle).

<Sound quality change processing>
FIG. 5 is a diagram illustrating a configuration example of the sound quality changing unit according to the first embodiment.

  The sound quality changing unit 140 is realized by, for example, a DSP DSP filter 500 that implements the echo canceller 121. Further, the DSP filter 500 of the sound quality changing unit 140 includes filters (processes) such as a far attenuation 501, an audio compression 502, and an echo addition / removal 503, for example.

(Far attenuation)
The far attenuation 501 executes, for example, a process of adding an attenuation effect corresponding to a sound arriving from a sound source farther from the vehicle 101 to sound outside the vehicle output from the speaker 102.

  For example, in FIG. 4, the distance attenuation 501 includes a predetermined distance D (for example, 10 m) that is sufficiently longer than the distance d between the passengers with respect to the sound 401 outside the vehicle 101 output from the speaker 102-1. ) Is attenuated by the attenuation amount of the sound propagating.

  Although there are various calculation methods for the attenuation of sound from a distance, here, as an example, the ISO standard (ISO 9613-2 “Acoustics-Attenuation of sound during propagation outdoors-Part 2: General method of calculation” .)) Will be described.

According to ISO 9613-2, the sound attenuation amount A (dB) from the point sound source to the sound receiving point is expressed by the following equation (1).
A = Adiv + Aatm + Aground + Ascreen + Amisc (1)
Here, Adiv represents attenuation due to geometric diffusion, Aatm represents attenuation due to atmospheric absorption, Aground represents attenuation due to the influence of the ground surface, Asscreen represents attenuation due to the shielding wall, and Amisc represents attenuation due to other factors.

In the present embodiment, for example, attenuation Aatm due to atmospheric absorption is applied, and the attenuation of sound arriving from a sound source far from the range of the vehicle 101 is calculated. According to ISO 9613-2, the amount of attenuation Aatm (dB) due to atmospheric absorption while propagating a distance d (m) is expressed by the following equation (2).
Aatm = αd / 1000 (2)
Here, α is an attenuation coefficient due to atmospheric absorption per kilometer. For example, Table 600 shown in FIG. 6 (Source: ISO 9613-2 “Acoustics-Attenuation of sound during propagation outdoors-Part 2: General method of calculation. ", Page 5, Table 2).

  As shown in FIG. 6, in ISO 9613-2, the voice band is divided into a plurality of frequency bands, and an attenuation coefficient α (dB / km) due to atmospheric absorption is determined for each frequency band. As shown in FIG. 6, the attenuation coefficient α for each frequency band is determined so that the attenuation amount increases as the frequency of the frequency band increases. Using this table 600 and Expression (2), the sound quality changing unit 140 adds an attenuation effect corresponding to the sound arriving from a sound source farther from the vehicle 101 to the sound outside the vehicle 101 output from the speaker 102. To do.

  In FIG. 6, the temperature and relative humidity values may be calculated as fixed values (for example, 15 ° C., 20%, etc.). It may be what you do.

  In addition, the attenuation coefficient α due to atmospheric absorption shown in FIG. 6 is an example, and the attenuation coefficient α is set in advance, for example, in an experiment so that the sound quality of the sound outside the vehicle 101 is different from the sound inside the vehicle 101. A predetermined value may be used.

(Audio compression)
The audio compression 502 is, for example, an audio compression process that suppresses the amplitude of the signal waveform with respect to the sound outside the vehicle 101 output from the speaker 102 and changes the sound to a suppressed sound by reducing the difference in the magnitude of the sound. Run.

  FIG. 7 is a diagram illustrating an image of audio compression according to the first embodiment. As shown in FIG. 7, the audio compression generates a signal waveform 702 in which the amplitude A of the portion exceeding the threshold value of the original signal waveform 701 is compressed to an amplitude B smaller than the amplitude A.

  Thereby, the sound quality changing unit 140 can change the sound outside the vehicle 101 output from the speaker 102 to a sound quality different from the sound inside the vehicle 101. Note that the audio compression 502 can be applied in combination with the far attenuation 501.

(Resonance sound addition / removal)
The reverberation sound addition / removal 503 executes, for example, processing for adding reverberation sound different from the acoustic characteristics in the vehicle 101 to the sound outside the vehicle 101 output from the speaker 102. Alternatively, the echo sound addition / removal 503 is, for example, an echo corresponding to the acoustic characteristics in the vehicle 101 from the sound outside the vehicle 101 that the hands-free call control unit 130 outputs from the speaker 102 via the in-car call control unit 120. A process for removing sound is executed.

  Thereby, the sound quality changing unit 140 can change the sound outside the vehicle 101 output from the speaker 102 to a sound quality different from the sound inside the vehicle 101. Note that the audio compression 502 can be applied in combination with the far attenuation 501 and the audio compression 502.

(Other)
As another example, the sound quality changing unit 140 limits, for example, the frequency range of audio outside the vehicle 101 that the hands-free call control unit 130 outputs from the speaker 102 via the in-car call control unit 120 to a narrower frequency range. It may be what you do.

  Thereby, the sound quality changing unit 140 may change the sound outside the vehicle 101 to be output from the speaker 102 to a sound quality like an analog telephone, for example, and generate a sound different from the sound inside the vehicle 101. .

  In this way, the sound quality changing unit 140 changes the sound quality of the sound outside the vehicle 101 output from the speaker 102 to a sound quality different from the sound quality of the sound inside the vehicle 101 when the in-car call is performed. If it is good.

<Process flow>
Next, an example of the in-car call control method according to the present embodiment will be described.

  FIG. 8 is a flowchart illustrating an example of a sound quality changing process according to the first embodiment. This process shows an example of a sound quality changing process by the sound quality changing unit 140 of the in-car communication device 110.

  In step S801, the sound quality changing unit 140 of the in-car call device 110 determines whether voice communication (hands-free call) by the hands-free call control unit 130 has been detected, and when voice communication is detected, step S802 and subsequent steps. The sound quality change process starts.

  For example, the sound quality changing unit 140 determines that voice communication is being performed when the received voice 112 is output from the hands-free call control unit 130, and voice communication is not performed when the received voice 112 is not output. It can be determined that the process has ended.

  In step S802, the sound quality changing unit 140 of the in-car call device 110 determines whether the in-car call by the in-car call control unit 120 is being performed.

  For example, the occupant of the vehicle 101 uses the “in-car call” setting button 901 displayed on the display screen 900 shown in FIG. 9A displayed on the display input unit 104 of the car navigation device or the like. Can be set to valid / invalid (on / off).

  In the example of FIG. 9A, the “in-car call” setting button 901 displayed on the display screen 900 indicates that the in-car call is off (invalid). In this state, when the occupant of the vehicle 101 selects the “in-car call” setting button 901, for example, the display screen 900 shown in FIG. 9B is displayed, and the in-car call is set to be valid.

  In the example of FIG. 9B, the “in-car call” setting button 901 displayed on the display screen 900 indicates that the in-car call is on (valid). When the occupant of the vehicle 101 selects the “in-car call” setting button 901 in this state, for example, a display screen 900 as shown in FIG. 9A is displayed, and the in-car call is set to be invalid.

  For example, the sound quality changing unit 140 can determine whether or not the in-car call is being performed by confirming the setting state of the “in-car call” setting button 901. Alternatively, the sound quality changing unit 140 may be a unit that determines whether or not an in-car call is being performed by acquiring an operation state of the in-car call control unit 120.

  When the in-car call is not performed, the sound quality changing unit 140 causes the process to proceed to step S804. On the other hand, when the in-car call is being performed, the sound quality changing unit 140 shifts the process to step S803.

  In step S803, the sound quality changing unit 140 of the in-car call device 110 adds or removes the above-described far-field attenuation 501, the voice compression 502, or the echo sound with respect to the received voice 112 output from the hands-free call control unit 130. Change processing such as 503 is executed. As a result, the sound outside the vehicle 101 (received voice 112 for voice communication) output from the speaker 102 is changed to a sound quality different from the sound inside the vehicle 101 output from the speaker 102.

  In step S804, the sound quality changing unit 140 of the in-car call device 110 outputs the sound outside the vehicle 101 output from the speaker 102 to the speaker 102 via the sound amplifying unit 105.

  In step S805, the sound quality changing unit 140 of the in-car call device 110 determines whether or not the voice communication is finished.

  If the voice communication has not ended, the sound quality changing unit 140 returns the process to step S802 and repeatedly executes the same process. On the other hand, when the voice communication ends, the sound quality changing unit 140 ends the sound quality changing process.

  With the above processing, the sound quality changing unit 140 of the in-car call device 110 starts the sound quality changing process shown in steps S802 to S805 of FIG. 8 when voice communication is detected. When the sound quality changing process is started, the sound quality changing unit 140, when an in-car call is performed, outputs the sound outside the vehicle 101 output from the speaker 102 and the sound inside the vehicle 101 output from the speaker 102. Change to a different sound quality.

(Supplement)
The image of the processing of the in-car call system 100 described in FIG. 4 is an example. The in-car call system 100 can execute the same processing for passengers (for example, passengers 301 and 302) who are in other seats (for example, front seats A and B) in the vehicle 101.

  FIG. 10 is a diagram (3) illustrating an image of processing of the in-car call system according to the first embodiment. 10 includes, for example, speakers 102-3 and 102-4 and microphones 103-3 and 103-4 in addition to the configuration of the in-car call system 100 shown in FIG.

  In addition, in-car call device 110, for example, in addition to (or instead of) the processing described with reference to FIG. And output from the speakers 102-3 and 102-4. Similarly, the in-car communication device 110 acquires the voice spoken by the passenger 304 with the microphone 103-4 and outputs the voice from the speakers 102-3 and 102-4.

  As a result, the occupant 301 riding in the front seat A and the occupant 302 riding in the front seat B are uttered by the occupant 303 riding in the rear seat C and the occupant riding in the rear seat D. It becomes possible to hear the utterance 304 clearly.

  In this state, for example, when the hands-free call control unit 130 receives voice communication from the communication terminal 108 outside the vehicle and the hands-free call is started, the in-car call device 110 also receives, for example, an incoming voice of the hands-free call. Output from the speakers 102-3 and 102-4.

  At this time, the sound quality changing unit 140 determines the sound quality of the sound outside the vehicle 101 output from the speakers 102-3 and 102-4 when the in-car call is performed by the in-car call control unit 120. Change to a sound quality different from the sound quality.

  As described above, the in-car communication device 110 can execute the same processing for each seat in the vehicle 101.

[Second Embodiment]
In the first embodiment, the description has been given assuming that the voice outside the vehicle 101 is the received voice 112 of voice communication by the hands-free call control unit 130. As another example, the sound outside the vehicle 101 may be a sound outside the vehicle 101 acquired by an external microphone.

<Configuration of in-car call system>
FIG. 11 is a diagram illustrating an example of a configuration of an in-car call system according to the second embodiment. The in-car call system 100 according to the second embodiment includes an external microphone 1101 and an outside voice acquisition unit 1102 in addition to the configuration of the in-car call system 100 according to the first embodiment shown in FIG.

  The external microphone 1101 is provided outside the vehicle 101, for example, and acquires sound around the vehicle 101 (sound outside the vehicle 101).

  The outside-vehicle sound acquisition unit 1102 causes the speaker 102 to output the outside-vehicle sound 1103 acquired by the external microphone 1101. The outside-vehicle sound acquisition unit 1102 is another example of a second control unit that outputs the sound outside the vehicle 101 acquired outside the vehicle 101 from the speaker 102.

  When the in-car call is performed by the in-car call control unit 120, the sound quality changing unit 140 determines the sound quality of the voice outside the vehicle 101 (the voice received by the voice communication 112 or the voice 1103 acquired by the external microphone 1101). The sound quality is changed to a sound quality different from the sound in 101.

  Thereby, in the in-car call system 100 according to the present embodiment, for example, a voice spoken from outside the vehicle at a gas station, drive-through, or the like can be output with a sound quality different from that in the vehicle 101. It becomes like this.

  Preferably, the sound quality changing unit 140 executes different changing processes on the received voice 112 of voice communication and the voice 1103 acquired by the external microphone 1101.

<Process flow>
FIG. 12 is a flowchart illustrating an example of a sound quality changing process according to the second embodiment. This process shows an example of a sound quality changing process by the sound quality changing unit 140 of the in-car communication device 110 according to the second embodiment.

  In step S <b> 1201, the sound quality changing unit 140 of the in-car call device 110 determines whether or not a voice outside the vehicle 101 (a voice communication voice 112 or a voice 1103 acquired by the external microphone 1101) has been detected. Moreover, the sound quality change part 140 performs the sound quality change process after step S1202, when the sound outside the vehicle 101 is detected.

  In step S1202, the sound quality changing unit 140 of the in-car call device 110 determines whether the in-car call by the in-car call control unit 120 is being performed. Note that a method for determining whether an in-car call is being performed may be the same as in the first embodiment.

  When the in-car call is not performed, the sound quality changing unit 140 shifts the process to step S1204. On the other hand, when the in-car call is being performed, the sound quality changing unit 140 shifts the process to step S1203.

  In step S1203, the sound quality changing unit 140 of the in-car communication device 110 performs the above-described far attenuation 501, sound compression 502, or reverberation with respect to the detected sound outside the vehicle 101 (the reception sound 112 or the sound 1103). Change processing such as sound addition / removal 503 is executed. Thereby, the detected sound outside the vehicle 101 is changed to a sound quality different from the sound inside the vehicle 101.

  In step S 1204, the sound quality changing unit 140 of the in-car call device 110 outputs the sound outside the vehicle 101 to the speaker 102 via the sound amplifying unit 105.

  When the sound outside the vehicle 101 is detected by the above processing, the sound quality changing unit 140 of the in-car call device 110 executes the sound quality changing process shown in steps S1202 to S1204 of FIG.

  As described above, according to each of the embodiments described above, in the in-car call system 100 that outputs the voice of the speaker in the vehicle and the voice of the speaker outside the vehicle with the speaker provided in the vehicle, the speaker outside the vehicle. Can be easily discriminated.

DESCRIPTION OF SYMBOLS 100 In-car call system 101 Vehicle 102, 102-1, 102-2 Speaker 103, 103-1, 103-2 Microphone 108 Communication terminal (communication device outside the vehicle)
110 In-car call device 120 In-car call control unit (first control unit)
130 Hands-free call control unit (second control unit)
140 Sound quality change part (change part)
1102 Outside-vehicle audio acquisition unit (another example of the second control unit)

Claims (10)

An in-car communication device connected to a microphone and a speaker provided in the vehicle,
A first control unit for controlling in-vehicle calls for outputting the in-vehicle sound acquired by the microphone from the speaker;
A second control unit for outputting the sound outside the vehicle acquired outside the vehicle from the speaker;
When the in-car call is being performed, a changing unit that executes a changing process for changing the sound quality of the sound outside the vehicle to be output from the speaker to a sound quality different from the sound inside the vehicle;
An in-car communication device. The voice outside the vehicle is a received voice by voice communication with a communication device outside the vehicle,
The in-vehicle call device according to claim 1, wherein the changing unit executes the changing process when the voice communication is detected.   The said change process includes the process of adding the attenuation effect equivalent to the sound which reaches | attains from the sound source far from the said inside with respect to the sound outside the said vehicle output from the said speaker, The Claim 1 or 2 In-car communication device.   The in-vehicle communication device according to claim 3, wherein the attenuation effect includes a process of attenuating the sound outside the vehicle output from the speaker by an attenuation amount due to atmospheric absorption of sound propagating a predetermined distance. The changing process includes a process of dividing a voice band into a plurality of frequency bands and attenuating the sound outside the vehicle to be output from the speaker by a predetermined attenuation amount for each frequency band,
The in-vehicle communication device according to claim 1 or 2, wherein the predetermined attenuation amount is determined such that the attenuation amount increases as the frequency of the frequency band increases.   The in-vehicle communication device according to any one of claims 1 to 5, wherein the change process includes a process of compressing an amplitude of sound outside the vehicle to be output from the speaker.   The interior of the vehicle according to any one of claims 1 to 6, wherein the changing process includes a process of limiting a frequency range of sound outside the vehicle to be output from the speaker to a predetermined frequency range narrower than the frequency range. Telephone device.   The changing process is a process of adding a reverberant sound different from a reverberant sound in the vehicle to a sound outside the vehicle output from the speaker, or a reverberant sound in the vehicle from a sound outside the vehicle output from the speaker. The in-vehicle communication device according to any one of claims 1 to 7, further comprising: An in-car call system connected to a microphone and a speaker provided in the vehicle,
A first control unit for controlling in-vehicle calls for outputting the in-vehicle sound acquired by the microphone from the speaker;
A second control unit for outputting the sound outside the vehicle acquired outside the vehicle from the speaker;
When the in-car call is being performed, a changing unit that executes a changing process for changing the sound quality of the sound outside the vehicle to be output from the speaker to a sound quality different from the sound inside the vehicle;
An in-car call system. An in-car call control method by an in-car call system connected to a microphone and a speaker provided in the vehicle,
The in-car call system is
Controlling the in-vehicle call for outputting the sound in the vehicle acquired by the microphone from the speaker;
The sound outside the vehicle acquired outside the vehicle is output from the speaker,
A control method for in-car call, wherein, when the in-car call is being performed, the sound quality of the sound outside the vehicle to be output from the speaker is changed to a sound quality different from the sound in the vehicle.

Images