JPH04176299A - On-vehicle acoustic reproducing device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of wiring work and the reduction of reliability while reducing the number of wirings connecting each part by performing the multiplex transmission of the output signal of acoustic signal source, the output signal of an acoustic signal processing part, and a control signal controlling the operation of the acoustic signal source, speaker part, and acoustic signal processing part. CONSTITUTION:Decoders separating the acoustic signal from the control signal and encoders synthesizing them are respectively provided with plural acoustic signal sources 2,3,4, plural speaker parts 6a to 6f, acoustic signal processing part 5, and operation control part 1. The input terminal of the encoder and the output terminal of the decoder are successively connected loop-shape, and the multiplex transmission of the output signal of the acoustic signal source, the output signal of the acoustic signal processing part 5, and the control signal controlling the operation of the plural acoustic signal sources, the plural speaker parts, and the acoustic signal processing part 5 are performed via a transmission line 7. When the acoustic signal source selected by the operation control part outputs the acoustic signal to the transmission line, the acoustic signal is inputted to the acoustic signal processing part, outputted as the acoustic signal with plural channels after the signal processing directed by the operation control part. Each speaker part selects the signal of the corresponding channel to drive the speaker after amplification.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an in-vehicle sound reproducing device for reproducing sound signals in the cabin of an automobile.

(Prior Art) In recent years, development has been progressing on in-vehicle sound reproduction devices that select multiple acoustic signals in a vehicle interior, add reflected sound to the acoustic signals, and reproduce realistic sound using multiple speakers. There is.

A conventional in-vehicle sound reproduction device will be described below.

FIG. 12 is a block diagram showing the arrangement and configuration of this conventional vehicle-mounted sound reproducing device in a vehicle interior. In FIG. 12, 60 is an operation control unit that operates and controls the entire playback device, 61 is a cassette player unit, 62 is a tuner unit, and 63
64 is a compact disc (CD) changer unit, 64 is an audio signal processing unit, 65 is an amplifier unit, 66a is a left front speaker installed in the left front door, 66b is a left center speaker installed in the left rear door, 66c is a rear A left rear speaker provided on the left side of the tray, 66f a right front speaker provided on the right front door, 66e a right center speaker provided on the right rear door, and 66d a right rear speaker provided on the right side of the rear tray. . FIG. 13 is a block diagram showing the configuration of the operation control section 6o, in which 70 is a controller, 71 is an operation button 1, and 72 is a display. FIG. 14 shows the acoustic signal processing section 6
4, in which 81.83 is a selector, 82 is an A/D converter, 84 is a reflected sound adder, 85 is a sound quality adjuster, 86 is a D/A converter, and 87 is a volume adjuster. ,
88 is an acoustic signal processing unit 64 according to instructions from the operation control unit 60.
This is a controller that controls each part of the system. FIG. 15 shows the cassette player section 61. It is a block diagram showing the configuration of a tuner section 62 and a CD changer section 63, and 9o is a controller that controls each section in the cassette player section 61, tuner section 62, and CD changer section 63 according to instructions from the operation control section 60. , 91 is an audio signal reproducing unit that outputs an audio signal in response to a control signal from the controller 9o. The acoustic signal reproducing section 91 is a section that reproduces an acoustic signal unique to each of the cassette player, tuner, and CD changer, and operates according to an input control signal, and also sends information regarding reproduction to the controller 90.

The operation of the in-vehicle sound reproducing device configured as described above will be explained below.

First, the selection operation of the acoustic signal source will be explained.

In the operation control section 60, when the operation button 71 is operated, the controller 70 displays the operation content on the display 72, and also causes the cassette player section 61. A control signal is sent to the controller 90 in the tuner section 62 and CD changer section 63 to put the desired audio equipment into a playback state. Further, the controller 70 issues a signal source selection instruction to the controller 88 in the acoustic signal processing section 64. The controller 88 switches selectors 81 and 83 to select a desired signal source from among the cassette player section 61, tuner section 62, and CD changer section 63.

In this case, an analog audio signal from a cassette player or tuner is selected by a selector 81 and converted into a digital audio signal by an A/D converter 82. Also, since the CD changer section 63 outputs a digital audio signal, it is selected by the selector 83.

Next, the operation of acoustic signal processing will be explained. By operating the operation button 71 in the operation control unit 60, the controller 7o changes to the display 7.
2 displays the operation details, and the acoustic signal processing section 64
Instructs the controller 88 inside the controller 88 regarding signal processing details. Controller 8
8 sets the reflected sound adder 84 and the tone quality adjuster 85, which are configured with a digital signal processor, to the specified contents. The reflected sound adder 84 performs delay and addition processing on the 2-channel acoustic signals to generate 6-channel reflected sounds in order to create a sense of presence and spaciousness in the vehicle interior. The sound quality adjuster 85 corrects the acoustic characteristics of the passenger compartment and adjusts the sound quality to obtain desired acoustic characteristics. The acoustic signal processed as described above is converted into a 6-channel analog signal by the D/A converter 86, the playback volume is adjusted to a desired level by the volume controller 87, and amplified by the amplifier section 65. By driving each of the speakers 66a to 66f, it is possible to reproduce a desired sound signal in the vehicle interior with a desired sound quality and a sense of presence and spaciousness.

(Problem to be Solved by the Invention) However, in the above configuration, each audio device and the operation control unit, each audio device and the audio signal processing unit, and the amplifier unit and each speaker are individually connected, and When the devices are arranged separately, the wiring becomes very complicated, resulting in an increase in the weight of the wiring, deterioration of wiring workability, deterioration of reliability, and deterioration of the degree of freedom in the arrangement of each device.

The present invention solves the above-mentioned conventional problems, and aims to provide an in-vehicle sound reproducing device that requires fewer wirings for connecting each audio device, an operation control section, an audio signal processing section, an amplifier section, and each speaker. shall be.

(Means for Solving the Problems) In order to achieve this object, an in-vehicle audio device of a first invention includes a plurality of speaker sections including a plurality of acoustic signal sources and an amplifier, and an output signal of the acoustic signal source. an acoustic signal processing unit for processing, an operation control unit that centrally controls operations of the plurality of acoustic signal sources, the plurality of speaker units, and the acoustic signal processing unit, the plurality of acoustic signal sources, and the plurality of speakers. Department,
A decoder that separates the audio signal and the control signal included in each of the audio signal processing unit and the operation control unit, an encoder that combines the audio signal, and an input end of the encoder and an output end of the decoder are sequentially connected in a loop shape. It is equipped with a transmission line.

Further, the in-vehicle sound reproducing device of the second invention includes a plurality of acoustic signal sources, a plurality of speaker sections including an acoustic signal processing section and an amplifier that process output signals of the acoustic signal sources, and a plurality of speaker sections that process the output signals of the plurality of acoustic signal sources. an operation control unit that centrally controls operations of the plurality of audio signal sources, the plurality of speaker units, and the operation control unit, and separates acoustic signals and control signals included in each of the plurality of audio signal sources, the plurality of speaker units, and the operation control unit. The encoder includes a decoder for combining, an encoder for combining, and a transmission line that sequentially connects the input end of the encoder and the output end of the decoder in a loop.

(Function) The present invention has the above configuration, (1) output signal of the acoustic signal source, output signal of the acoustic signal processing section, and control signal related to operation control of the acoustic signal source, the speaker section, and the acoustic signal processing section. By multiplexing transmission of After that, it is output to the transmission line as a multi-channel acoustic signal, and input to multiple l − speaker sections. Each speaker section selects the signal of the corresponding channel, and after amplifying it, drives the speaker. All signals related to sound reproduction can be transmitted through the transmission line.

(2) By multiplexing the output signal of the acoustic signal source and the control signal related to the operation control of the acoustic signal source and speaker section, the acoustic signal source selected by the operation control section outputs the acoustic signal to the transmission line. Then, the acoustic signal is input to multiple speaker units, and the acoustic signal processing unit in each speaker unit performs signal processing instructed by the operation control unit, and after amplification, drives the speaker. All signals related to sound reproduction can be transmitted.

(Example) Examples of the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described.

FIG. 1 is a blower diagram showing the arrangement and configuration of an in-vehicle sound reproducing device in a vehicle interior according to a first embodiment of the present invention. In FIG. 1, 1 is an operation control unit that operates and controls the entire playback device, 2 is a cassette player unit, 3 is a tuner unit, 4 is a CD changer unit, 5 is an audio signal processing unit, and 6a is a left front door. 6b is a left center speaker section provided on the left rear door; 6C is a left rear speaker section provided on the left side of the rear tray; 6f is a right front speaker section provided on the right front door; 6e is a right center speaker section provided on the right rear door, 6d is a right rear speaker section provided on the right side of the rear tray, and each speaker section 6
A to 6f have built-in amplifiers. Reference numeral 7 denotes a transmission line that connects various parts and transmits signals. FIG. 2 is a block diagram showing the configuration of the operation control unit 1, in which 8a is a decoder that separates the acoustic signal and the control signal, 9a is the encoder that combines the acoustic signal and the control signal, 10 is the controller, and 11 is the operation button. , 12 is a display. FIG. 3 is a block diagram showing the configuration of the cassette player section 2, tuner section 3, and CD changer section 4, in which 8b is a decoder that separates the acoustic signal and the control signal, and 9
13 is a controller that controls the cassette player section 2, tuner section 3, and various parts of the CD changer section according to instructions from the operation control section 1; 14 is a controller that switches the acoustic signal; selector,
Reference numeral 15 denotes an audio signal reproducing section that outputs an audio signal in response to a control signal from the controller 13. FIG. 4 is a block diagram showing the configuration of the acoustic signal processing section 5, in which 8c is a decoder that separates the acoustic signal and the control signal, 9c is the encoder that combines the acoustic signal and the control signal, and 1G is an instruction from the operation control section 1. 17 is a reflected sound adder, and 18 is a sound quality adjuster. FIG. 5 is a block diagram of the speaker units 6a to 6f, in which 8d is a decoder that separates an acoustic signal and a control signal, 9d is an encoder that combines an acoustic signal and a control signal, L9 is a D/A converter, and 20
21 is an amplifier, 22 is a speaker, and 23 is a controller that controls the volume adjuster 20 according to instructions from the operation control section 1. FIG. 6 is a diagram showing the signal configuration of the output signal of the encoder, which is composed of a synchronization signal, a two-channel source audio signal, a six-channel reproduced audio signal, and a control signal.

The operation of the in-vehicle sound reproduction device configured as described above will be described below.

First, the operation of the operation control section 1 will be explained with reference to FIG. The decoder 8a separates the 2-channel source acoustic signal, the 6-channel reproduced acoustic signal, and the control signal from the signal on the transmission line 7, and sends the control signal to the controller 10, and the source acoustic signal and the reproduced acoustic signal to the encoder 9a. The source acoustic signal is an output signal of an acoustic signal source, and the reproduced acoustic signal is a signal to be reproduced by a speaker section. Controller 1
0 judges the received control signal and displays its contents on the display 12 if display is necessary. Further, the controller 10 displays the details of the operation on the display 12 in accordance with the operation of the operation button 11, and sends a control signal to the encoder 9a. The encoder 9a synthesizes this control signal, the source audio signal output from the decoder 8a, and the reproduced audio signal, and sends it to the transmission line 7 as a serial signal having a signal configuration as shown in FIG. In this manner, the operation control unit 1 changes the control -11= signal among the signals on the transmission line 7 in accordance with the operation of the operation button 11, and sends the acoustic signal to the transmission line 7 again without changing it.

Next, the operations of the cassette player section 2, tuner section 3, and CDD changer 4, which are audio signal sources, will be explained with reference to FIG. The decoder 8b separates the signal input from the transmission line 7 into a source audio signal and a reproduced audio signal.

The control signal is input to the controller 13, and the controller 13 outputs a signal to control the operation of the audio signal reproducing unit 15 according to the content of the control signal sent out by the operation control unit 1. The audio signal reproducing unit j5 is a part that reproduces audio signals unique to each of the cassette player, tuner, and CD changer, and operates according to the input control signal, and also sends information regarding reproduction to the controller 13. Also, the reproduced acoustic signal is sent to the selector 14. The acoustic signal here is a digital signal,
For tuners and cassette players, signals after A/D conversion are output. The selector 14 switches between the source audio signal from the decoder 8b and the source audio signal from the audio signal reproducing section 15 according to instructions from the controller 13, and outputs the signal to the encoder 9b. Selector 14 in encoder 9b
The source audio signal selected by the decoder 8b, the reproduced audio signal separated by the decoder 8b, and the control signal from the controller 13 are combined and sent to the transmission line 7 as a serial signal with a signal configuration as shown in FIG. . In this way, among the three audio signal sources, cassette player section 2, tuner section 3, and CDD changer 4, one audio signal source selected by the operation of the operation control section 1 receives the source audio signal separated by the decoder 8b. The acoustic output is sent to the encoder 9b in a replacing manner, and the source acoustic signals separated by the decoder 8b for other audio signal sources not selected are sent to the encoder 9b as they are without being replaced. Therefore, the output of one acoustic signal source selected as the source acoustic signal is transmitted to the transmission line 7.

Next, the operation of the acoustic signal processing section 5 will be explained with reference to FIG. The decoder 8c separates the signal input from the transmission line 7 into a source audio signal, a reproduced audio signal, and a control signal.

The separated control signal is a signal sent in response to an operation on the operation control device l.

The control signal is input to the controller 16, and the controller 16 sets the reflected sound adder 17 and the tone quality adjuster 18, which are constructed of a digital signal processor, to the specified contents according to the contents. The reflected sound adder 17 performs delay and addition processing on the two-channel source sound signal separated by the decoder 8c to generate six channels of reflected sound in order to obtain a sense of presence and spaciousness in the vehicle interior. The sound quality adjuster 18 corrects the acoustic characteristics of the passenger compartment and adjusts the sound quality to obtain desired acoustic characteristics. This 6-channel signal is the 6-channel signal inside the vehicle.
This is a unique signal corresponding to each speaker section placed at a location, and is input to the encoder 9c as a reproduced audio signal.

The encoder 9c synthesizes the source acoustic signal separated by the decoder 8c, the six-channel reproduced acoustic signal generated by the reflected sound adder and adjusted by the sound quality adjuster, and the control signal from the controller 16, as shown in FIG. It is sent to the transmission line 7 as a serial signal having the signal configuration as shown.

Next, the operation of the speaker sections 6a to 6f will be explained with reference to FIG. The decoder 8d separates the signal input from the transmission line 7 into a source audio signal, a reproduced audio signal, and a control signal. Of the six separated channels of reproduced audio signals, one channel of the reproduced audio signals to be reproduced by the corresponding speaker section is converted into an analog signal by a D/A converter 19,
The volume is adjusted by a volume controller 20, amplified by an amplifier 21, and a speaker 22 is driven. The control signal separated by the decoder 8d is input to the controller 23. The controller 23 controls the volume adjuster 20 and adjusts the volume according to the operation of the operation control unit l. The encoder 9d recombines the source audio signal, reproduced audio signal, and control signal separated by the decoder 8d, and sends the combined signal to the transmission line 7.

As described above, according to this embodiment, the source acoustic signal output from the acoustic signal source, the reproduced acoustic signal output from the acoustic signal processing section, and the operation control of the acoustic signal source, the speaker section, and the acoustic signal processing section are controlled. By multiplexing the control signals and the control signals, it is possible to transmit all the signals related to sound reproduction using a single transmission line, and when the equipment is placed in a vehicle with limited space. This simplifies wiring between devices, reduces the weight of wiring, improves wiring workability, improves reliability, and increases the degree of freedom in arranging each device, which is highly practical.

Next, a second embodiment of the present invention will be described.

FIG. 7 is a block diagram showing the arrangement and configuration of an in-vehicle sound reproduction device in a vehicle interior according to a second embodiment of the present invention. In FIG. 7, 30 is an operation control section that operates and controls the entire playback device, 31 is a cassette player section, 32 is a tuner section, 33 is a CD changer section, and 34a is a left front speaker section provided on the left front door. , 34b is a left center speaker section provided on the left rear door, 34c is a left rear speaker section provided on the left side of the rear tray, 34f is a right front speaker section provided on the right front door, and 34e is a right rear speaker section provided on the right rear door. 34d is a right rear speaker section provided on the right side of the rear tray, and 35 is a transmission line for connecting each section and transmitting signals. FIG. 8 is a block diagram showing the configuration of the operation control unit 30, in which 36a is a decoder that separates the acoustic signal and the control signal, 37a is the encoder that combines the acoustic signal and the control signal, 40 is the controller, and 41 is the operation button. , 42 is a display. FIG. 9 is a block diagram showing the configuration of the cassette player section 31, tuner section 32, and CD changer section 33, in which 36b is a decoder that separates the audio signal and the control signal, 37b is an encoder that combines the audio signal and the control signal, 43 is a controller that controls each part in the cassette player section 31, tuner section 32, and CD changer section 33 according to instructions from the operation control section 30; 44 is a selector that switches audio signals; and 45 is a control signal for the controller 43. This is an audio signal reproducing unit that outputs an audio signal in accordance with.

FIG. 1O is a block diagram showing the configuration of the speaker sections 34a to 34f, in which 36c is a decoder that separates an acoustic signal and a control signal, 37c is an encoder that combines an acoustic signal and a control signal, and 46 is an instruction from the operation control section 30. According to speaker 3
A controller for controlling each part in 4a to 34f, 47 a reflected sound adder, 48 a sound quality adjuster, 49 a D/A converter,
50 is a volume controller, 51 is an amplifier, and 52 is a speaker. FIG. 11 is a diagram showing the signal structure of the output signal of the encoder, which is composed of a synchronization signal, a two-channel source audio signal, and a control signal.

The operation of the in-vehicle sound reproduction device configured as described above will be described below. First, the operation of the operation control section 30 will be explained with reference to FIG. Decoder 3
6a separates the two-channel source acoustic signal and control signal from the signal on the transmission line 35, and sends the control signal to the controller 40;
The source audio signal is sent to encoder 37a. The source acoustic signal is the output signal of the acoustic signal source. The controller 40 judges the received control signal, and if it is necessary to display it, displays it on the display 42.
display its contents. Further, the controller 40 displays the details of the operation on the display 42 in accordance with the operation of the operation button 41, and sends a control signal to the encoder 37a. The encoder 37a combines this control signal with the source acoustic signal output from the decoder 8a and sends it to the transmission line 35 as a serial signal having a signal configuration as shown in FIG.

In this manner, the operation control unit 30 changes the control signal among the signals on the transmission line 35 in accordance with the operation of the operation button 41, and sends the signal to the transmission line 35 again without changing the acoustic signal.

Next, the operations of the cassette player section 31, tuner section 32, and CD changer section 33, which are audio signal sources, will be explained with reference to FIG. The decoder 36b is the transmission line 3
The signal input from 5 is separated into a source acoustic signal and a control signal. The control signal is input to the controller 43, and the controller 43 outputs a signal to control the operation of the audio signal reproducing unit 45 according to the content of the control signal sent out by the operation control unit 30. The acoustic signal reproducing section 45 is a section that reproduces an acoustic signal unique to each of the cassette player, tuner, and CD changer.
It operates in accordance with input control signals, and also sends information regarding reproduction to the controller 43 and reproduced audio signals to the selector 44. The audio signal here is a digital signal, and the tuner and cassette player output the signal after A/D conversion. The selector 44 is the controller 4
3, the source audio signal from the decoder 36b and the source audio signal from the audio signal reproducing section 45 are switched and output to the encoder 37b.

The encoder 37b combines the source acoustic signal selected by the selector 44 and the control signal from the controller 13, and generates the first signal.
The signal is sent to the transmission line 35 as a serial signal having a signal configuration as shown in FIG. In this way, among the three audio signal sources, cassette player section 31, tuner section 32, and CD changer section 33, one acoustic signal source selected by the operation of the operation control section 30 is the source acoustic signal separated by the decoder 36b. The audio outputs of other audio signal sources that are not selected are sent to the encoder 37b in a form that replaces them, and the source audio signals separated by the decoder 36b are sent to the encoder 37b without being replaced. Therefore, the output of one acoustic signal source selected as the source acoustic signal is transmitted to the transmission line 35.

Next, the operation of the speaker sections 34a to 34f will be explained with reference to FIG. 10. The decoder 36c separates the signal input from the transmission line 35 into a source acoustic signal and a control signal. The separated control signal is a signal sent out in response to an operation at the operation control unit 3o. The control signal is input to the controller 46, and the controller 46 sets the reflected sound adder 47 and the tone quality adjuster 48, which are constructed of a digital signal processor, to the specified contents according to the contents. Reflected sound adder 4
In step 7, in order to obtain a sense of presence and spaciousness in the vehicle interior, the decoder 36c performs delay and addition processing on the separated source sound signal to generate reflected sound. The sound quality adjuster 48 corrects the acoustic characteristics of the passenger compartment and adjusts the sound quality to obtain desired acoustic characteristics. This signal is converted into an analog signal by a D/A converter 49, the volume is adjusted by a volume controller 50, and amplified by an amplifier 51 to drive a speaker 52. The control signal separated by the decoder 36c is input to the controller 46. The controller 46 controls the volume adjuster 50 according to the operation of the operation control unit 30 to adjust the volume. The encoder 37c recombines the source acoustic signal and control signal separated by the decoder 36c and sends it to the transmission line 35.

As described above, according to this embodiment, the source acoustic signal output from the acoustic signal source and the control signal related to the operation control of the acoustic signal source and the speaker section are multiplexed and transmitted, so that the sound can be transmitted through one transmission line. All signals related to playback can be transmitted, making wiring between devices easier when placing and interconnecting devices in a vehicle with limited space, reducing wiring weight and improving wiring work efficiency. , reliability can be improved, and flexibility in the arrangement of each device can be improved, and its practicality is great. Also, compared to the first embodiment, the number of acoustic signals to be transmitted is 2
Since it is only the source audio signal of the channel, there is no need to increase the signal transmission speed, and for example, the digital audio interface standard defined by the Japan Electronics Industry Association can be applied. The actual configuration can be simplified. Also, compared to the first embodiment, there is no independent audio signal processing unit, and a large-scale digital signal processor is not required, and the audio signal processing performed in each speaker unit is configured with a small-scale digital signal processor. There are features that allow it.

Further, although both the first embodiment and the second embodiment use time division multiplexing as a multiplexing method, it is also possible to use frequency multiplexing by modulating the control signal or each acoustic signal and defining the frequency range. Furthermore, although both the first and second embodiments use conductive wires for transmitting electrical signals as transmission lines, optical-to-electrical converters and electrical-to-optical converters are added to the decoders and encoders, respectively. Therefore, an optical fiber can also be used as a transmission line.

(Effects of the Invention) As is clear from the above examples, the present invention has the following effects.

(1) A plurality of acoustic signal sources, a plurality of speaker sections including an amplifier, an acoustic signal processing section that processes an output signal of the acoustic signal sources, the plurality of acoustic signal sources, the plurality of speaker sections, and the acoustic an operation control section that centrally controls the operation of the signal processing section; and acoustic signals and control signals included in each of the plurality of acoustic signal sources, the plurality of speaker sections, the acoustic signal processing section, and the operation control section; The output signal of the acoustic signal source and the output signal of the acoustic signal processing unit are The output signal and the control signal related to the operation control of the acoustic signal source, speaker section, and acoustic signal processing section can be multiplexed and transmitted, and the acoustic signal source selected by the operation control section outputs the source acoustic signal to the transmission line. Then, the acoustic signal is input to the acoustic signal processing section, subjected to signal processing instructed by the operation control section, and then outputted to the transmission line as a multi-channel reproduced acoustic signal, inputted to the plural speaker sections, and transmitted to each speaker section. selects the reproduced sound signal of the corresponding channel, amplifies it, and then drives the speaker. All signals related to sound reproduction can be transmitted through a single transmission line, making it possible to fit into a vehicle with limited space. Wiring between devices when arranging and interconnecting devices becomes easier, reducing the weight of wiring, improving wiring workability, improving reliability, and increasing the degree of freedom in arranging each device. Sex is big.

(2) A plurality of speaker sections including a plurality of acoustic signal sources, an acoustic signal processing section and an amplifier that process output signals of the acoustic signal sources, and operations of the plurality of acoustic signal sources and the plurality of speaker sections. an operation control unit that performs centralized control; a decoder that separates the audio signal and the control signal included in each of the plurality of audio signal sources, the plurality of speaker units, and the operation control unit; and an encoder that combines the control signal; By providing a transmission line that sequentially connects the input end of the encoder and the output end of the decoder in a loop, the output signal of the acoustic signal source and
The acoustic signal source and the control signal related to the operation control of the speaker section can be multiplexed and transmitted, and when the acoustic signal source selected by the operation control section outputs the acoustic signal to the transmission line, the acoustic signal is input to the speaker section. The signal is processed as instructed by the operation control unit, and after being amplified, it drives the speaker, making it possible to transmit all the signals related to sound reproduction through a single transmission line, making it ideal for cars with limited space. Wiring between devices when placing and connecting them indoors becomes easier, reducing the weight of wiring, improving wiring workability, improving reliability, and increasing the degree of freedom in arranging each device. The practicality is great. Furthermore, since the acoustic signal to be transmitted is only the output of the acoustic signal source, there is no need to increase the transmission speed, and the actual configuration of the encoder and decoder can be simplified. Furthermore, since there is no independent audio signal processing section, a large-scale digital signal processor is not required, and the audio signal processing performed in each speaker section can be configured with a small-scale digital signal processor.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the in-vehicle sound reproduction device in the first embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the operation control section in the first embodiment, and FIG.
Cassette player section, tuner section in the embodiment of C
A block diagram showing the configuration of the D changer section, FIG.
5 is a block diagram showing the configuration of the acoustic signal processing section in the first embodiment, FIG. 5 is a block diagram showing the configuration of the speaker section in the first embodiment, and FIG. 6 is a serial signal configuration diagram output from the encoder to the transmission line. , FIG. 7 is a block diagram showing the configuration of an in-vehicle sound reproduction device in the second embodiment of the present invention, FIG. 8 is a block diagram showing the configuration of the operation control section in the second embodiment, and FIG. Cassette player section in the second embodiment. FIG. 10 is a block diagram showing the configuration of the tuner section and CD changer section, FIG. 10 is a block diagram showing the configuration of the speaker section in the second embodiment, and FIG. 11 is the output from the encoder to the transmission line in the second embodiment. Serial signal configuration diagram,
FIG. 12 is a block diagram showing a conventional example of an in-vehicle sound reproduction device, FIG. 13 is a block diagram showing the configuration of an operation control section in the conventional example, and FIG. 14 is a block diagram showing the configuration of audio signal processing in the conventional example. FIG. 15 is a block diagram showing the configuration of a cassette player section, a tuner section, and a CD changer section in a conventional example. 1, 30.60... operation control unit, 2, 3],
, 61...cassette player section, 3.32.6
2...Tuner section, 4.33.63...CD changer section, 5..Acoustic signal processing section, 6a-6
f, 34a ~ 34f, 6 [3a ~ 66 f...
Speaker section, 7, 35--transmission line, 8a-8
d, 368 to 36c = decoder, 9 a to 9 d
, 37a-37cm encoder, 10.13. +
6.23.4.0.43゜46, 70.88. '90
...Controller, 11.41.71...Operation button, 12
．． 42', 72...Display unit, 14°44, 83.
...Selector, 15.45.91...Acoustic signal reproducing section, 17.47.84...Reflected sound adder, 18.
48.85...Sound quality adjuster, 19°49, 46...
・D/A converter, 20.50.87...Volume adjuster, 21.51...Amplifier, 22.52...Speaker. Patent applicant Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] (1) A plurality of acoustic signal sources, a plurality of speaker sections including an amplifier, an acoustic signal processing section that processes an output signal of the acoustic signal source, the plurality of acoustic signal sources, the plurality of speaker sections, and the acoustic signal source. an operation control section that centrally controls the operation of the signal processing section; and acoustic signals and control signals included in each of the plurality of acoustic signal sources, the plurality of speaker sections, the acoustic signal processing section, and the operation control section; A decoder that separates the signals, an encoder that combines the signals, and an input end of the encoder and an output end of the decoder are sequentially connected in a loop, so that the output signal of the audio signal source, the output signal of the audio signal processing section, and the A vehicle-mounted sound reproducing device comprising: a plurality of acoustic signal sources; and a transmission line for multiplex transmission of control signals related to operation control of the plurality of speaker sections and the acoustic signal processing section. (2) A plurality of acoustic signal sources, a plurality of speaker sections including an acoustic signal processing section and an amplifier that process output signals of the acoustic signal sources, and operations of the plurality of acoustic signal sources and the plurality of speaker sections. an operation control unit that centrally controls; a decoder that separates the audio signal and the control signal included in each of the plurality of audio signal sources, the plurality of speaker units, and the operation control unit; and an encoder that combines the control signal; The input end of the encoder and the output end of the decoder are sequentially connected in a loop, and the output signal of the acoustic signal source and the control signal related to the operation control of the plurality of acoustic signal sources and the plurality of speaker sections are multiplexed and transmitted. An in-vehicle sound reproducing device characterized by comprising a transmission line.