JPH0623342U - Automotive sound system - Google Patents

Abstract

(57) [Abstract] [Purpose] By connecting the on-vehicle audio equipment and the wireless communication device into a system, the functions of the on-vehicle audio equipment and the mobile phone are expanded, and at the same time, the operation is simplified to drive the vehicle. To ensure the safety of. [Configuration] An external mixing input terminal 10 for connecting the in-vehicle audio device 1 and the wireless communication device 20 by interfacing with each other through a communication line 30, and connecting a reception signal of the wireless communication device 20 to the in-vehicle audio device 1 and a volume. A mute circuit 6 for controlling the level and a mixing circuit 7 are provided so that the reproduction signal of the vehicle-mounted audio device 1 is muted to listen to the reception signal of the mobile phone 20. A reception signal switching unit 27 is provided to enable hands-free operation of the mobile phone 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle-mounted audio system in which a vehicle-mounted audio device and a wireless communication device are connected, and more particularly to a vehicle-mounted audio system suitable for expanding the use function of the vehicle-mounted device and improving operability. .

[0002]

[Prior art]

 Conventionally, a car stereo, which is an on-vehicle audio device, has been effectively used by connecting to a plurality of source devices. For example, playback signals from FM / AM radio receivers, cassette tape players, CD players, in-vehicle TVs, etc., which are the above-mentioned multiple source devices, are connected to the car stereo, and the multiple in-vehicle speakers installed inside the vehicle It was playing stereo.

On the other hand, a vehicle-mounted wireless communication device, such as a mobile phone or a personal wireless device having a mobile communication function, has been used separately from the vehicle-mounted audio device. Many of the in-vehicle audio devices and mobile phones shown in FIGS. 3 and 4 were provided.

FIG. 3 is a block diagram of a car stereo, and FIG. 4 is a block diagram of a mobile phone having a mobile communication function. In FIG. 3, reference numeral 2 is an AM / FM tuner, 3 is a cassette / CD player, and the reproduction signal of the AM / FM tuner 2 or cassette / CD player 3 that is the source device is selected by the switch 4 and output. It is output to the speaker 9 via the amplifier 8.

Reference numeral 12 denotes a control unit capable of controlling the source device, the switching device 4 and the like, and a micro computer (hereinafter simply referred to as a microcomputer) or the like is generally used. The microcomputer of the control unit 12 operates according to the instruction data from the operation keys 13, and the data signal-processed by the control unit 12 is displayed on the display unit 14.

On the other hand, in the mobile phone of FIG. 4, reference numeral 21 denotes a transmitter circuit of the telephone and 24 denotes a receiver circuit. The microphone 26a of the handset 26 is connected to the transmitter circuit 21, and the receiver circuit 24 has a handset. 26 speakers 26b are connected. A control unit 25 controls the transmission circuit 21 and the reception circuit 24. The control unit 25 is composed of a microcomputer as described above, and a dial key 28 of a telephone is connected to the control unit 25.

In the mobile phone configured as described above, the voice signal from the microphone 26a of the handset 26 is modulated by the transmission circuit 21 to be a wireless communication signal and transmitted from the antenna, while the reception signal received by the antenna is The demodulated voice signal is demodulated by the receiving circuit 24 and output from the speaker 26b of the handset 26.

That is, a user who is driving a vehicle listens to a favorite music from a CD player or the like on a car stereo, and operates the dial keys 28 on the mobile phone as needed to use the phone.

[0009]

[Problems to be solved by the device]

 However, the use of the above-described conventional mobile phone 20 while driving the vehicle is performed by operating the dial key 28 while driving the vehicle and further reducing the volume level of the speaker output of the car stereo during a telephone call. There is a drawback that it is necessary to operate the controller to create an environment where telephone calls can be made.Because the above operation is performed while the vehicle is driving, cautions for driving the vehicle are lacking, and safety of driving the vehicle cannot be ensured. There was a problem.

In addition, since the in-vehicle mobile phone is used in a vehicle interior noise, for example, vehicle road noise, engine combustion noise, mission gear noise, exhaust noise, wind noise, etc., the speaker of the handset 26 is used. There was a problem that the call sound from 26b could not be heard.

The present invention has been made in view of the above points, and an object thereof is to solve the drawbacks of the conventional example and connect a wireless communication device to an in-vehicle audio device to provide a system having an operational function. We are providing an in-vehicle acoustic system that realizes the realization of the new technology and expands the functions while simplifying the operation and ensuring the safety of vehicle operation.

[0012]

[Means for Solving the Problems]

 The in-vehicle audio system of the present invention is configured by connecting an in-vehicle audio device that selects reproduction signals from a plurality of source devices and outputs a sound from a plurality of speakers to a wireless communication device having a mobile communication function. An audio system for a vehicle, wherein the control unit for controlling the operation of the in-vehicle audio device and the control unit for controlling the operation of the wireless communication device are provided with a communication line, and the in-vehicle audio device is provided. An external mixing input terminal is provided on the and the receiving signal received by the wireless communication device is connected to the external mixing input terminal.

Further, a mute circuit for detecting the input received signal to mute the reproduced signal to a predetermined volume level, and a mixing circuit for mixing the reproduced signal and the received signal are provided. It is installed in the on-vehicle audio equipment.

Further, in the in-vehicle audio equipment, a switching device may be provided for switching the reproduction signal so as to output to the speaker without passing through the mute circuit and the mixing circuit.

In addition, a mute control terminal may be provided in the in-vehicle audio device, and the mute circuit may control the volume level by a mute control signal supplied to the mute control terminal.

Further, the wireless communication device is a mobile phone, and a transmission signal switching unit provided on the mobile phone for switching and setting a transmission signal, an external microphone for transmission connected to the transmission signal switching unit, A reception signal switching unit that switches and sets the reception signal of the mobile phone is provided. Meanwhile, a voice output switching unit is provided after the speaker output amplifier of the above-described vehicle-mounted audio equipment, and the output signal switched by the voice output switching unit is set. Is supplied to the transmission signal switching section of the mobile phone, and a reproduction / recording switching section is provided after the external mixing input terminal of the in-vehicle audio device, and the reception signal of the mobile phone is provided in the reproduction / recording switching section. May be supplied.

[0017]

[Action]

 According to this invention, a vehicle-mounted audio device that selects reproduction signals from a plurality of source devices and outputs a sound from a plurality of speakers, such as a car stereo and a wireless communication device having a mobile communication function, such as a mobile phone, The control unit that controls the operation of the car stereo and the control unit that controls the operation of the mobile phone are interfaced and connected by a serial input / output (SIO) communication line. An external mixing input terminal is provided on the car stereo, and the external mixing input terminal is connected so as to supply the reception signal of the mobile phone, while the car stereo is provided with a muting circuit and a mixing circuit. Is.

When the reception signal received by the mobile phone is input to the external mixing input terminal, the control section detects the input reception signal and supplies it to the mute circuit. The reproduced signal is muted to a predetermined volume level and supplied to the mixing circuit. On the other hand, in the above mixing circuit, the muted reproduced signal and the received signal of the mobile phone can be mixed and output to the speaker, and the received signal of the mobile phone can be simultaneously heard while listening to the reproduced signal. Can be listened to automatically.

Further, the car stereo is provided with a switcher for switching the reproduction signal so as to output to the speaker without passing through the mute circuit and the mixing circuit, and the mixing function is eliminated by switching and setting the switcher. The car stereo and the mobile phone can be returned to their respective usage states independently.

In addition, the mute control terminal is provided in the car stereo, and the mute control of the mute circuit is performed by the DC voltage supplied to the mute control terminal to control the volume level of the reproduction signal to an arbitrary volume level. You can

Further, a transmission signal switching unit for switching and setting transmission signals provided in the mobile phone, an external microphone for transmission connected to the transmission signal switching unit, and a reception signal for switching and setting reception signals of the mobile phone. By providing the switching unit, the transmission signal switching unit and the reception signal switching unit are controlled and switched by the control unit to enable the hand-free communication of the mobile phone, and also the handset can be operated.

On the other hand, an audio output switching unit is provided after the speaker output amplifier of the car stereo, and the output unit of the audio signal can be output from an arbitrary speaker by switching setting by the control unit of the audio output switching unit. Also, by supplying the signal to the transmission signal switching unit of the mobile phone, when the mobile phone is on hold, the melody can be transmitted to the other party when the call is on hold.

Furthermore, a reproducing / recording switching section is provided after the external mixing input terminal of the car stereo, and a reception signal of the mobile phone is supplied to the reproducing / recording switching section for switching control by the control section. As a result, it is possible to transmit a response message of the answering machine function of the mobile phone from the cassette player in which the prerecorded data is recorded, and record the received signal from the other party at the time of the answering machine to the cassette player.

In this way, by connecting the car stereo and the mobile phone 20 by interfacing, many operation functions can be executed, and the user operating the vehicle can operate each car stereo and the mobile phone. Therefore, as a systematic in-vehicle audio system, hands-free telephone calls can be made with simple operations, which simplifies operations and ensures the safety of vehicle driving.

[0025]

【Example】

 An embodiment of a vehicle-mounted acoustic system according to the present invention will be described with reference to FIGS. 1 and 2. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a block diagram of a vehicle-mounted audio system that is systematized by connecting a vehicle-mounted audio device and a wireless communication device, and FIG. 2 is another implementation that is systemized by connecting the vehicle-mounted audio device and a mobile phone. It is an example block diagram.

In FIG. 1, reference numeral 1 is an on-vehicle audio device, 5 is a switcher for switching the reproduction signals selected from the source devices 2 and 3, and the switching operation of the switcher 5 is controlled by a controller 12. Controlled. Reference numeral 6 is a mute circuit, and 7 is a mixing circuit. The operations of the muting circuit 6 and the mixing circuit 7 are controlled by the control unit 12.

Reference numeral 10 is an external mixing input terminal, the input signal applied to the external mixing input terminal 10 is supplied to the mixing circuit 7, and 11 is a mute control terminal for controlling the mute operation of the mute circuit 6. The input signal applied to the mute control terminal 11 is supplied to the control unit 12. Reference numeral 15 is a serial input / output interface circuit (SIO) that connects the control unit 12 and the control unit 25 of the wireless communication device with a communication line 30.

Reference numeral 20 is a wireless communication device having a mobile communication function, and 23 is an external microphone. A voice signal input from the external microphone 23 is transmitted from an antenna via a transmission circuit 21 and received by the antenna. The received signal is supplied to the above-mentioned external mixing input terminal 10 of the on-vehicle audio equipment 1 via the receiving circuit 24.

The reproduction signal from the AM / FM tuner 2 or the cassette / CD player 3 which is a source device in which the on-vehicle audio device 1, for example, the car stereo 1 is built in, such as a music signal, is switched by the switch 4. Selected. The switching control of the switching unit 4 is controlled by the control unit 12 by a key input on the operation unit 13, and the user can select and set the source device of his or her preference.

The selected music signal is supplied to the switching unit 5 which turns ON / OFF the mixing function. When the switching unit 5 is turned OFF, the music signal is supplied to the output amplifier 8 and the mixing function is turned OFF. It can be set to a state, and the switching control of the switching device 5 can be controlled by the control unit 12 in response to an instruction from the operation unit 13 as described above. On the other hand, when the switch 5 is turned on, the music signal is supplied to the mute circuit 6 and the volume level of the music signal can be controlled.

In the operation of the mute circuit 6, the control unit 12 recognizes the moment of input of the voice signal supplied to the external mixing input terminal 10, and the control unit 12 controls the mute circuit 6 so that the music signal The volume level can be muted to a predetermined level, and this mute-controlled music signal is output to the mixing circuit 7.

The audio signal input to the external mixing input terminal 10, that is, the received signal of the wireless communication device 20 is directly supplied to the mixing circuit 7 and mixed with the muted music signal. The mixed music signal and the voice signal received by the wireless communication device 20 are output from the speaker 9 via the output amplifier 8, and the user receives the music signal at the low volume level of the car stereo 1 and the wireless communication device 20. It can be heard in the state of being mixed with the audio signal at the same time.

At the same time, the control unit 12 can send necessary data to the display unit 14 and display it. For example, the operation and control information of the car stereo 1 can be displayed, and at the same time, the received signal information of the wireless communication device 20 supplied to the external mixing input terminal 10 can be displayed. The received signal information of the wireless communication device 20 can be displayed by sending data sent from the control unit 25 of the wireless communication device 20 to the control unit 12 through the interface of the SIO 15 via the communication line 30.

Although it has been described that the mute control level of the mute circuit 6 is controlled by the controller 12 at a predetermined level, the mute control terminal 11 is provided to the mute control terminal 11 as shown in FIG. The volume level of the music signal can be controlled to an arbitrary mute control level by an externally applied DC voltage.

In this manner, the car stereo 1 is provided with the external mixing input terminal 10 for external expansion, and the interface of the SIO 15 of the control unit 12 enables systematization with the wireless communication device 20 and the reproduction signal of the car stereo 1. The (muted volume level) and the received signal of the wireless communication device 20 can be mixed to operate the wireless communication device 20, improving the operability when the wireless communication device 20 is used and at the same time the car stereo 1 The volume volume adjustment is not required, which simplifies the operation and ensures the safety of vehicle operation.

Further, since the ON / OFF operation of the mixing function can be performed by the switch 5, it is possible to easily return to the conventional independent use state of the car stereo 1 and the wireless communication device 20.

FIG. 2 shows another embodiment systematized by the car stereo 1 and a mobile phone having a mobile communication function. In FIG. 2, the same parts as those of FIG. 1 or the conventional example are designated by the same reference numerals. The description is omitted.

Reference numeral 16 denotes a reproduction / recording switching section provided on the signal line of the external mixing input terminal 10. The output of the reproduction / recording switching section 16 is supplied to the mixing circuit 7 and the cassette / CD player 3. A switching device that switches the output signal according to the control unit 12.

Reference numeral 17 denotes an audio output switching unit provided in the latter stage of the output amplifier 8. The audio output switching unit 17 switches the output of the audio signal to a plurality of speakers 9 and outputs the audio signal, and the control unit 12 Output to any speaker 9 depending on the state of the audio signal output, such as a mixed sound of the music signal and the reception signal of the mobile phone 20, or only the music signal, or only the reception voice signal of the mobile phone 20. You can control what you do.

In particular, in the case of in-vehicle use, which speaker 9 is to be used for output is determined depending on the number of passengers in the vehicle, such as 2-seater, 3-seater, 4-seater. It is also possible to output only from a specific speaker in consideration of the private idea of a telephone, such as when it is unacceptable to be heard by all passengers like the received signal of a telephone call.

Further, as described above, it is possible to switch the audio signal output to the speaker 9 and the music signal to the transmitter circuit 21 of the mobile phone at the same time. Reference numeral 18 is an external memory unit connected to the control unit 12, and this external memory unit 18 can store data such as supplementary functions controlled by the car stereo 1.

Reference numeral 40 denotes a power supply terminal of the mobile phone 20, to which a vehicle battery (ACC) and a rechargeable spare battery (Batt) can be switched and connected to the power supply terminal 40 via a power switch 41. The vehicle battery (ACC) is used as a power source in the general usage state of the in-vehicle audio system, and the mobile phone 20 is in standby mode for the answering machine or when the engine of the vehicle is not replenishing the generator battery. It can be set by switching to the battery (Batt) to prevent exhaustion of the vehicle battery (ACC).

On the other hand, in the mobile phone 20 having the mobile communication function, 22 is a transmission signal switching unit provided on the input side of the transmission circuit 21, and the transmission signal switching unit 22 constitutes a switching circuit with three contacts. As shown in the figure, the contact 22a is connected to the external microphone 23, the contact 22b is connected to the output of the audio output switching section 17 of the car stereo 1, and the contact 22c is connected to the microphone of the handset. Reference numeral 26 is a handset, and the handset 26 is composed of a microphone 26a and a speaker 26b.

Reference numeral 27 is a reception signal switching unit provided on the output side of the reception circuit 24. The reception signal switching unit 27 is composed of a switching circuit with two contacts, and as shown in the figure, the contact 27a is provided outside the car stereo 1. It is connected to the mixing input terminal 10 and the contact 27b is connected to the speaker 26b of the handset 26.

In the vehicle-mounted acoustic system thus configured, the control unit 12 of the car stereo 1 and the control unit 25 of the mobile phone 20 are interfaced with the serial input / output SIO 15 via the communication line 30 as described above. By using the serial communication of this communication method, for example, the communication method such as RS-232C, RS-422, etc., long-distance communication within the range of serial communication is possible.

Further, the reception signal received by the reception circuit 24 of the mobile phone 20 is supplied to the external mixing input terminal 10 of the car stereo 1 via the reception signal switching section 27, so that the car stereo is similar to FIG. The mute circuit 6 of No. 1 can mix with the reproduced music signal whose volume level has been adjusted to be reduced and output the speaker 9.

In this way, while listening to the reproduced signal from the source device such as the cassette / CD player 3 of the car stereo 1, the user who is driving the vehicle turns off the handset 26 of the mobile phone 20 as necessary. By operating the dial keys 28, the other party can be called and transmitted / received like a general telephone. During transmission of this mobile phone 20, the mixing circuit 7 is stopped by the control of the control unit 12 of the car stereo 1, and only the mute circuit 6 is activated to reduce the output of the speaker 9 of the reproduced music currently being listened to. .

The transmission state of the mobile phone 20 during driving of the vehicle can be transmitted in various states as described below. (1) When sending and receiving hands-free while driving the vehicle. When the car audio system is set to the telephone transmission state by the mobile phone 20 by operating the operation unit 13 of the car stereo 1, the control unit 12 of the car stereo 1 puts the reproduced music signal from the source device into the muting state, and at the same time. The control unit 12 switches and sets the transmission signal switching unit 22 of the mobile phone 20 to the contact 22a and the reception signal switching unit 27 to the contact 27a via the communication line 30.

That is, the transmission signal of the mobile phone 20 becomes an audio signal input from the external microphone 23, and the audio signal from the external microphone 23 is transmitted via the transmission circuit 21, so that the user who is driving the vehicle is You can send a phone call in a free state. On the other hand, the reception signal of the mobile phone 20 is supplied to the external mixing input terminal 10 of the car stereo 1 by the reception signal switching section 27 via the reception circuit 24, and is mixed with the reproduced music signal as described above to switch the audio output. It is output from the speaker 9 via the unit 17.

The output of the speaker 9 is controlled to be switched by the audio output switching unit 17, and which speaker 9 is to be output can be determined in advance and the received audio can be output. That is, the received sound of the mobile phone 20 is output only from the speaker 9 near the user who is driving the vehicle, the user who is driving the vehicle can clearly hear the received signal in the vicinity, and the music signal is output from the other speakers 9. can do.

As described above, the transmission of the mobile phone 20 is transmitted from the external microphone 23 installed in the mouth of the user who is driving the vehicle, and the received sound is output from the speaker 9 near the user who is driving the vehicle and is completely transmitted. The mobile phone 20 can be used in an extremely hands-free state.

When the hands-free mobile phone 20 is used, as an auxiliary function of the operation unit 13 and the external memory unit 18 of the car stereo 1, the dial memory input / output at the time of transmission is controlled by the control unit 12 to record the memory. And memory calls can also be made.

(2) When transmitting and receiving with the handset 26 while the vehicle is driving. When the handset 26 of the mobile phone 20 is lifted and hooked up, the control unit 25 of the mobile phone 20 switches the transmission signal switching unit 22 to the contact 22c and the reception signal switching unit 27 to the contact 27b. Therefore, the mobile phone 20 becomes a telephone response using the handset 26, and the user who is driving the vehicle can use the handset 26 as a general phone, while the speaker 9 output of the car stereo 1 is music. Output only.

The music output from the speaker 9 during a call of the handset 26 is muted by the control of the control unit 12 by the mute circuit 6 to reduce the volume level, and is passed through the mixing circuit 7 controlled by the control unit 12. The voice signal when the mobile phone 20 is talking can be made clear.

Further, in the circuit configuration of FIG. 1 or FIG. 2, a mute circuit 6 is arranged after the switching device 4, and a switching device 5 for switching the mixing circuit 7 is arranged at the subsequent stage of the mute circuit 6. It can be configured so that only the audio signal level of the speaker 9 output can be reduced and output without using the mixing circuit 7 as when the handset 26 is used.

(3) When the mobile phone 20 is put on hold. During a call by the mobile phone 20, if the mobile phone 20 is desired to be put on hold, it can be put on hold by operating the dial key 28. It is also possible to control the control unit 25 of the mobile phone 20 via the control unit 12 by operating the operation unit 13 of the car stereo 1 to put it in the hold state as well.

In the hold state, the control unit 25 switches the contact point of the transmission signal switching unit 22 to the contact point 22b and the contact point of the reception signal switching unit 27 to the contact point 27a when the hand is free. Switch to contact 27b during operation.

That is, the transmission of the mobile phone 20 becomes a hold tone melody transmission state, and the music signal of the castelleo 1 can be output to the receiving circuit 24 of the mobile phone 20 via the voice output switching unit 17. In this case, the control unit 12 of the car stereo 1 can release the mute operation of the mute circuit 6 and send a general output music signal.

(4) When setting the mobile phone 20 to the state of the answering machine function. When the power switch 41 connected to the power terminal 40 of the mobile phone 20 is switched from the vehicle battery (ACC) to the spare battery (Batt), the control unit 25 recognizes the switching operation of the power switch 41 and switches the transmission signal. The part 22 is switched to the contact 22b, and the reception signal switching part 27 is switched to the contact 27a.

A control signal from the control unit 25 is sent to the control unit 12 via the communication line 30, and the control unit 12 controls the reproduction / recording switching unit 16 of the external mixing input terminal 10 to make the mobile phone 20. At the time of transmission, the pre-recorded answering machine message from the cassette player 3 can be reproduced and output and supplied to the transmission circuit 21 via the reception signal switching section 27 to be transmitted. The tape reproduction of the player 3 is canceled to bring the mobile phone 20 into the receiving state.

When the mobile phone 20 enters the reception state, the reproduction / recording switching unit 16 is switched to the recording state, and the reception signal received by the reception circuit 24 is supplied to the reproduction / recording switching unit 16 via the reception signal switching unit 27. The received signal can be sent to the cassette player 3 and recorded.

In this way, when the mobile phone 20 transmits the message from the cassette player 3 as an answering machine and records the received sound of the mobile phone 20 to the cassette player 3, the mobile phone 20 and the mobile phone 20 are completed. The car stereo 1 is automatically turned off. Even in this auto off state, the mobile phone 20 is backed up by the spare battery (Batt) to maintain the function of the answering machine, and the power switch 41 is used for the vehicle battery ( The answering machine of the telephone can continue until it is switched to ACC).

The embodiment of the in-vehicle sound system in which the car stereo 1 and the mobile phone 20 are connected to each other has been described above. An external mixing input terminal 10, a mute circuit 6 and a mixing circuit 7 can be provided in the wireless communication device 20 having a mobile communication function, and not only the mobile phone 20 but also a vehicle-mounted personal wireless device. It can also be applied to machines and amateur radios.

Furthermore, the present invention is applicable not only to in-vehicle devices but also to home electronic devices such as home audio devices, CD radio cassette recorders, home color TVs, video devices, and BS tuners for outputting reproduced audio signals. You can also

[0065]

[Effect of device]

 As described above, the vehicle-mounted acoustic system according to the present invention has been described with reference to the use example in which the car stereo 1 and the wireless communication device 20 having a mobile communication function, for example, the mobile phone 20 are connected. The digital communication with the mobile phone 20 via the communication line 30 by the serial communication function (RS-232C or RS-422 etc.) makes it strong against many noises inside the vehicle (inside the vehicle), and the car stereo 1 There is an effect that the sound quality of the audio signal of the mobile phone 20 can be improved and the sound can be heard.

Further, when using the mobile phone 20 while listening to the music of the car stereo 1, it is possible to arbitrarily determine and execute the hand-free operation and the output of the speaker 9 of the received signal, and the operation does not have a manual operation part. As a result, the operation is simplified and the safety of driving the vehicle can be ensured even when the mobile phone 20 is used.

Further, by sharing the common portion between the car-mounted car stereo 1 and the car-mounted mobile phone 20, it is possible to collectively configure the functions installed in each device, and There is also an effect that the cost can be reduced.

Moreover, it has excellent features such as a simple structure and easy implementation because the vehicle-mounted acoustic system can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an in-vehicle audio system according to the present invention and systematically connecting an in-vehicle audio device and a wireless communication device.

FIG. 2 is a block diagram showing another embodiment in which an in-vehicle audio device and a mobile phone are connected to form a system.

FIG. 3 is a block diagram showing a conventional on-vehicle audio device.

FIG. 4 is a block diagram showing a conventional in-vehicle mobile phone.

[Explanation of symbols]

 1 In-vehicle audio equipment 2 AM / FM tuner 3 Cassette / CD player 4 Switcher for playback signal of source device 5 Switcher for switching mixing function 6 Mute circuit 7 Mixing circuit 8 Output amplifier 9 Speaker 10 External mixing input terminal 11 Mute control Terminal 12 In-vehicle audio equipment control section 13 Operation section 14 Display 15 Serial input / output (SIO) interface 16 Playback / recording switching section 17 Audio output switching section 18 External memory section 20 Wireless communication device (cell phone) 21 Transmitting circuit 22 Transmitting signal switching unit 23 External microphone 24 Receiving circuit 25 Mobile phone control unit 26 Handset 27 Reception signal switching unit 28 Dial key 30 Communication line 40 Power supply terminal 41 Power supply switching unit ACC Vehicle battery (ACC) Batt Spare battery (Batt) )

Claims (4)

[Scope of utility model registration request] 1. A vehicle-mounted audio system configured by connecting a vehicle-mounted audio device that selects reproduction signals from a plurality of source devices and acoustically outputs from a plurality of speakers, and a wireless communication device having a mobile communication function. A communication line connecting an interface between the control unit for controlling the operation of the vehicle-mounted audio device and the control unit for controlling the operation of the wireless communication device is provided, and an external mixing input is provided to the vehicle-mounted audio device. Provide terminals,
A mute circuit configured to connect the received signal received by the wireless communication device to the external mixing input terminal, detect the input received signal, and mute the reproduced signal to a predetermined volume level, An in-vehicle audio system, wherein the in-vehicle audio device is provided with a mixing circuit for mixing the reproduced signal and the received signal. 2. The on-vehicle audio equipment according to claim 1, further comprising a switcher for switching the reproduction signal to output to a speaker without going through the mute circuit and the mixing circuit. Sound system. 3. The on-vehicle audio equipment is provided with a mute control terminal, and the mute control signal supplied to the mute control terminal is used to control the volume level by the mute circuit. The in-vehicle acoustic system described. 4. The wireless communication device is a mobile phone,
A transmission signal switching unit for switching and setting transmission signals provided in the mobile phone, an external microphone for transmission connected to the transmission signal switching unit, and a reception signal switching unit for switching and setting reception signals of the mobile phone are provided. On the other hand, on the other hand, an audio output switching unit is provided in the latter stage of the speaker output amplifier of the in-vehicle audio device, and the output signal switched and set by the audio output switching unit is supplied to the transmission signal switching unit of the mobile phone, and 4. A reproduction / recording switching unit is provided after the external mixing input terminal of the audio equipment, and a reception signal of the mobile phone is supplied to the reproduction / recording switching unit. The in-vehicle acoustic system described.