JP4466010B2 - In-vehicle 5-channel audio device - Google Patents

Description

  The present invention relates to an on-vehicle 5-channel audio device, in particular, a front left (FL) channel, a rear left (RL) channel, a front front (FR) channel, a rear right (RR) channel, and The present invention relates to an on-vehicle 5-channel audio device that reproduces audio of a 5-channel audio signal including a center (C: Center) channel on a corresponding speaker.

  The driving style of mounting an audio device in a car and driving while enjoying music or the like with the audio device has become widespread, and it is becoming a culture. And the in-vehicle audio apparatus has been improved in performance and tends to be multi-channel. Currently, four-channel audio devices are widely used as multi-channel in-vehicle audio devices. FIG. 2 is a plan view showing the arrangement of speakers in each channel when a seat in the vehicle and a 4-channel audio device are installed. As shown in FIG. 2, the left front (FL) channel and the left rear (RL) channel are shown. In addition, speakers corresponding to four channels in combination of the right front (FR) channel and the right rear (RR) channel are arranged, and sound is reproduced by the speakers.

By the way, various automobiles are equipped with a car navigation device, and the output sound of the car navigation device (hereinafter referred to as “car navigation sound” for convenience) is also reproduced using the multi-channel audio device. It is in. In addition, various types of alarms that give warnings by voice are appearing (see Japanese Patent Laid-Open Nos. 09-073588 and 09-066783), but the warning sound is also a multi-channel audio device. Attempts have been made to replay using the.
Furthermore, when talking on a mobile phone, in order to prevent the driver's attention to driving operation from being lost due to the call, the received voice from the other party of the call is reproduced using the in-vehicle audio device. The ones that have been made are also increasing.

These car navigation sounds, warning sounds, and received voices can be said to be sub-voices that are different from music playback voices produced by various music sources in the audio device.
Conventionally, as shown in FIG. 3, the audio signal of the sub-audio is added to each of the audio signals of all the four channels and is reproduced by all the speakers of the four channels. . RLA, FLA, FRA, and RRA are amplification units provided corresponding to the respective channels, and the four amplification units RLA, FLA, FRA, and RRA constitute a 4-channel audio amplifier. An adder is provided in the preceding stage of each of the amplification units RLA, FLA, FRA, and RRA, and the audio signal of the channel and the sub audio signal are input to each adder.

  By the way, the applicant company of the present application has developed a 5-channel audio device in which the in-vehicle audio device has been made more multi-channel. As shown in FIG. 4, the in-vehicle 5-channel audio device includes a 4-channel speaker, that is, a speaker RLSP, FLSP, FRSP, RRSP, and a center (center) speaker SPA provided rearward on the front face. In addition, audio signals of each channel are sent to the five speakers, and a signal obtained by adding the left signal L and the right signal R is applied to the center speaker CSP.

In the 5-channel in-vehicle audio apparatus, the sub-audio signal is added to all the channels, that is, each of the 5-channel audio signals in the same manner as the 4-channel in-vehicle audio apparatus, and the sub-audio signal is added to all the 5-channel speakers. It was studied to make audio playback.
JP 09-073588 A Japanese Patent Laid-Open No. 09-066783

However, the sub-audio is originally required for the driver to listen to the car navigation sound, warning sound, and received sound, but for other passengers, mainly those who sit in the back seat. It is a sound that gets in the way of appreciating the original music. In particular, there are many cases in which it is not desirable for the person who sits in the back seat (hereinafter referred to as “rear seat passenger”) to listen to the received voice in a phone call.
Therefore, it can be said that it is not preferable to reproduce the sound from all the speakers of the five channels.

The present invention has been made to solve such a problem. In the in-vehicle 5-channel audio device, the auxiliary sound is easy to hear only by the driver, and is difficult to hear by people of other seats. The purpose is to.

The in-vehicle five-channel audio apparatus of the present invention includes a left front channel, a left rear channel, a right front channel, a right rear channel, and a center channel of the left front side and the right front side in combination with five channels of audio output signals. An in-vehicle 5-channel audio device that supplies sound to a 5-channel speaker provided at a position corresponding to each channel and reproduces sound, the 5-channel speaker being indirectly connected, and the entire in-vehicle 5-channel audio device Under the control of the control unit for controlling the sound, the sound data from the tuner to be reproduced by the 5-channel speaker , the sound data from the car navigation device, the sound data from the mobile phone, and the sound related to various warning sounds of the vehicle from the sensor Data, images from the car navigation device And a system bus for transmitting data relating, which is connected between the system bus and the 5-channel speakers, by the voice data from the tuner generates an audio output signal to be reproduced on the 5-channel speakers, the It is connected to the audio output signal and the audio signal generating circuit for supplying to the 5-channel speakers, between the position of the speaker which corresponds to the center channel and the system bus, the audio data from the car navigation device, the mobile phone generating an output audio, sub audio signal is a voice signal received audio or car various warning sounds of the cellular phone from the car navigation apparatus by the audio data relating to audio data, or various warning sound of the automobile from the secondary audio The signal at the position corresponding to the central channel. Includes a sub-audio signal generating circuit for supplying to the speaker, and supplies the audio output signal of the 5 channels by the audio signal generating circuit to the 5-channel speakers, a sub-audio signal by the sub-audio signal generation circuit the It is added to the audio output signal of the central channel and supplied to only the speaker at the position corresponding to the central channel.

According to the in-vehicle 5-channel audio device of the present invention, the secondary sound is reproduced by only the central one channel which is close to the driver and distant from the back seat occupant. It is possible to prevent obstruction, and it is possible to prevent a call by a mobile phone from being clearly intercepted by a rear seat person.
Further, since the sub sound is reproduced only by the central channel speaker, the circuit can be simplified as compared with the case where the sub sound is reproduced by the speakers of all the channels.

  The present invention basically reproduces an auxiliary audio signal (for example, an output sound of a car navigation device, a reception sound of a mobile phone or various warning sounds of an automobile) by the above-mentioned central one channel in an in-vehicle 5-channel audio device. In addition to the audio output signal to be supplied to the speaker corresponding to the channel, an adder circuit is provided in the preceding stage of the amplifier for amplifying the audio signal of the central channel among the amplifiers for amplifying the audio signal. In the preferred embodiment, the center channel audio signal is input to one of the input terminals, and the sub audio signal is input to the other input terminal.

Hereinafter, the present invention will be described in detail according to illustrated embodiments.
FIG. 1 is a circuit block diagram showing a first embodiment of a vehicle-mounted 5-channel audio apparatus according to the present invention. 2 is a system bus, and 4 is a control unit, which includes a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Rondom Access Memory), etc., and executes a program stored in the ROM. Controls the entire on-vehicle 5-channel audio device, 6 is a television and radio tuner, 8 is an interface for processing a video signal output from the tuner 6, and 10 outputs an audio signal output from the tuner 6. An interface 12 is an image synthesizing circuit that processes data related to an image and generates an image signal to be displayed on the display 14.

The display 14 is formed integrally with the car navigation device 16 and can reproduce a television image and an image of the car navigation device 16. The output image signal of the car navigation device 16 is reproduced by the display 14, and the output audio signal is reproduced by the vehicle-mounted 5-channel audio device as a sub audio signal.
18 is a map information recording medium that is mounted on the car navigation device 16 and provides map information for car navigation, 20 is a switch for various operations provided at the bottom of the display 14, and 22 is a switch from the switch 20 by its operation. It is an interface that processes the output signal.

Reference numeral 24 is a GPS (Global Pointing System) and traffic jam information receiver, 26 is an interface for processing the output signal of the receiver 24, 28 is various players, and 30 is an interface for processing the output signal of the player 28. Reference numeral 32 denotes a mobile phone, and the received voice signal is reproduced by the in-vehicle 5-channel audio device as a sub-audio signal during a call, and is detachably attached to the in-vehicle 5-channel audio device.
Reference numeral 34 denotes various sensors of the automobile, and 36 denotes a sensor output analysis circuit that analyzes the output signals of the sensors 34 and generates an output corresponding to a preset warning type according to the analysis result. The warning sound signal generated from the circuit 36 is reproduced as a sub-audio signal by a vehicle-mounted 5-channel audio device.

Reference numeral 38 denotes an audio signal generation circuit which generates an audio signal to be reproduced by a 5-channel speaker described later based on audio data from the tuner 6 or various players 28.
Reference numeral 40 denotes a 5-channel audio amplifier, which is provided in front of the amplification units RLA, FLA, CA, FRA, RRA provided corresponding to the 5-channel audio signal and the amplification unit CA provided corresponding to the central channel. And an adder 42. RLSP, FLSP, CSP, FRSP, and RRSP are speakers, speaker RLSP is a rear left speaker, speaker FLSP is a front left speaker, speaker CSP is a center front side, speaker FRSP is a front right speaker, and speaker RRSP is a rear right speaker. is there.

A sub audio signal generation circuit 44 generates a sub audio signal based on audio data from the car navigation device 16, the audio interface of the tuner 10, the mobile phone 32 and / or the sensor output analysis circuit 36. The sub audio signal output from the audio signal generation circuit 44 is input to the adder 42.
The adder 42 receives the central channel audio signal from the audio signal generation circuit 38 at one input terminal and the sub audio signal from the sub audio signal generation circuit 44 at the other input terminal. The output audio signal of the channel and the sub audio signal are added and sent to the amplifier CA.
In addition, since arrangement | positioning in the vehicle of each speaker RLSP, FLSP, CSP, FRSP, and RRSP is the same as the arrangement | positioning shown in FIG. 4, the illustration is abbreviate | omitted.

According to such an on-vehicle 5-channel audio device, the sub-sound is reproduced by the central one-channel speaker CSP that is close to the driver and far from the back seat occupant, so that the back seat occupant can enjoy the original music and the like. It can be prevented from being obstructed by the secondary voice, and a call by the mobile phone 32 can be prevented from being clearly intercepted by the rear seat person.
Further, since the sub-audio is reproduced only by the center channel speaker CA, the circuit can be simplified as compared with the case where the sub-audio is reproduced by the speakers RLSP, FLSP, CSP, FRSP and RRSP of all channels.

  The present invention can be used in general for in-vehicle 5-channel audio devices.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit block diagram showing a first embodiment of a vehicle-mounted 5-channel audio device according to the present invention. It is an in-vehicle top view which shows arrangement | positioning of the speaker of each channel at the time of installing the seat in a vehicle and a 4-channel audio apparatus. It is a circuit diagram which shows the built-in amplifier of the 4-channel audio apparatus which is background art. It is an in-vehicle top view which shows arrangement | positioning of the speaker of each channel at the time of installing the vehicle seat and the vehicle-mounted 5-channel audio apparatus.

Explanation of symbols

40 ... 5-channel audio amplifier, 42 ... adder, 44 ... sub audio signal generation circuit, RLSP, FLSP, CSP, FRSP, RRSP ... speaker, CSP ... sub audio reproduction Center channel speaker.

Claims (1)

The left front channel, the left rear channel, the right front channel, the right rear channel, and the center channel of the left front side and the right front side are provided in a position corresponding to each channel. An in-vehicle five-channel audio device for supplying sound to a channel speaker and reproducing the sound,
The 5-channel speaker is indirectly connected , and audio data from the tuner to be reproduced by the 5-channel speaker and audio from the car navigation device are controlled by a control unit that controls the entire in-vehicle 5-channel audio device. A system bus for transmitting data, audio data from a mobile phone, audio data relating to various warning sounds of an automobile from a sensor, and data relating to an image from the car navigation device ;
Connected between the system bus and the 5-channel speaker , generates an audio output signal to be reproduced by the 5-channel speaker based on audio data from the tuner , and sends the audio output signal to the 5-channel speaker. an audio signal generating circuit for supplying,
Connected between the system bus and a speaker at a position corresponding to the central channel, and car navigation is performed by voice data from the car navigation device, voice data from the mobile phone, or voice data related to various warning sounds of the automobile. output sound from the device, generates a sub-audio signal is the speech signal of the received audio or car various warning sounds of the cellular phone, the sub-audio signal to supply the auxiliary audio signal to the position of the speaker corresponding to the center channel generated Circuit,
With
The audio signal generation circuit supplies the 5-channel audio output signal to the 5-channel speaker, and the sub-audio signal generation circuit adds the sub-audio signal to the audio output signal of the central channel. A vehicle-mounted 5-channel audio apparatus characterized by being supplied only to a speaker at a position corresponding to the above.

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