CN208300007U - A kind of automobile audio circuit - Google Patents
A kind of automobile audio circuit Download PDFInfo
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- CN208300007U CN208300007U CN201821066508.1U CN201821066508U CN208300007U CN 208300007 U CN208300007 U CN 208300007U CN 201821066508 U CN201821066508 U CN 201821066508U CN 208300007 U CN208300007 U CN 208300007U
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- Prior art keywords
- automobile audio
- dsp processor
- audio circuit
- decoder
- automobile
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Abstract
The utility model relates to a kind of automobile audio circuits, comprising: MOST bus interface seat, MOST decoder, microprocessor, dsp processor, DAC converter, wherein MOST bus interface seat is connected by MOST bus with former Main Engine；MOST decoder, input terminal are connected with MOST bus interface seat, and output end is connected with dsp processor, and control terminal is connected with microprocessor.This automobile audio circuit provided by the utility model, due to having the MOST bus interface seat that the light digital signal that former Main Engine exports can be converted to electric digital signal, and to the MOST decoder that electric digital signal is decoded, so not having to dismantle former vehicle power amplifier, as long as finding the MOST bus delivery outlet of former vehicle, this automobile audio circuit provided by the utility model is directly plugged, the repacking of acoustics circuit can be completed.Not only repacking is convenient, but also since repacking circuit structure is simple, line layout is few, can effectively contain audio signal loss, promote the musical qualities of automobile audio, user experience is high.
Description
Technical field
The utility model relates to automobile audio technical fields, and in particular to a kind of automobile audio circuit.
Background technique
With the development of the automobile industry, sound system is installed on automobile is a very common thing, automobile audio system
The also increasingly diversification of the function of system, and requirement of the people to automobile audio function is also higher and higher.
MOST bus is Bayerische Motorne Werke Aktiengeellschaft, Daimler Chrysler (DaimlerChrysler) company, Harman/Becker
Combine the standard of formulation between company (sound system manufacturer) and Oasis Silicon Systems company, dedicated for full
Foot requires stringent vehicle environment, has the advantage for mitigating weight and reducing electromagnetic interference (EMI).
Referring to Fig. 1, the acoustics circuit structure of existing superior automobile is: MOST decoder passes through MOST bus and former Main Engine
It is connected, MOST decoder output digit signals are sent to dsp processor, and digital signal that dsp processor export that treated is to counting
Mode converter carries out digital-to-analogue conversion, and the analog signal of operational amplifier logarithm mode converter output amplifies, after output amplification
Analog signal to drive loudspeaker.
Since the musical qualities of sound system shown in FIG. 1 output can not meet people's needs, especially music
There is a collection of modified audio industry in this case in the demand of enthusiast.Since the former Main Engine of luxury car uses
MOST bus is as audio transmission, and general power amplifier can not parse the audio signal of MOST bus transfer currently on the market, then
Produce method of modifying as shown in Figure 2.
This method needs to dismantle former vehicle power amplifier, then finds out corresponding data line, is welded by electric iron, signal is connect
Corresponding dsp processor or operational amplifier, are finally output to loudspeaker.That is general method of modifying currently on the market
All be to be reequiped by coming out from former vehicle power amplifier lead, the shortcomings that such method of modifying is: modification difficulty is big, route
Complexity, route are lack of standardization, can introduce bigger noise, automobile power consumption greatly, these are not ideal method of modifying.
Utility model content
In view of this, a kind of automobile audio circuit is provided the purpose of the utility model is to overcome the deficiencies in the prior art,
Solve the problems, such as that the repacking of MOST automobile audio circuit is complicated in the prior art, audio signal loss is serious.
In order to achieve the above object, the utility model adopts the following technical solution:
A kind of automobile audio circuit, comprising: MOST bus interface seat, MOST decoder, microprocessor, dsp processor,
DAC converter, wherein
The MOST bus interface seat is connected by MOST bus with former Main Engine, the light for exporting former Main Engine
Digital signal is converted to electric digital signal；
The MOST decoder, input terminal are connected with the MOST bus interface seat, output end and the dsp processor phase
Even, control terminal is connected with the microprocessor, for the electric digital signal to be decoded, exports decoded electricity number letter
Number；
The dsp processor, control terminal are connected with the microprocessor, to decoded electric digital signal
Reason, output at least digital audio and video signals all the way；
The DAC converter is connected with the dsp processor, for carrying out digital-to-analogue conversion to the digital audio and video signals,
Export analog audio signal.
Preferably, the automobile audio circuit, further includes: S/PDIF interface block, the dsp processor output at least two-way
Digital audio and video signals, wherein digital audio and video signals connect the input terminal of the DAC converter, another way digital audio and video signals all the way
Connect the S/PDIF interface block.
Preferably, the automobile audio circuit, further includes: IIS interface block, the dsp processor export at least three numbers
Word audio signal, wherein digital audio and video signals connect the input terminal of the DAC converter all the way, the second railway digital audio signal connects
The S/PDIF interface block is connect, third railway digital audio signal connects the IIS interface block.
Preferably, the automobile audio circuit, further includes: RCA interface block, the RCA interface block and the DAC converter
Output end be connected.
Preferably, the automobile audio circuit, further includes: the 12V DC electricity of power module, the power module and former vehicle
Output end connection, for the 12V DC electricity to be respectively converted into the MOST bus interface seat, MOST decoder, micro process
Device, dsp processor, DAC converter operating voltage.
Preferably, the power module, comprising: decompression conversion module；The decompression conversion module is used for the 12V
Direct current is converted to 5V direct current, powers for the DAC converter.
Preferably, the power module, further includes: voltage-stablizer；The voltage-stablizer, for being converted to the 5V direct current
3.3V and 2.5V direct current is powered for the MOST decoder；It is also used to the 5V direct current being converted to 3.3V and 1.1V is straight
Galvanic electricity is powered for the dsp processor；It is also used to the 5V direct current being converted to 3.3V direct current, is the MOST bus
Interface block and microprocessor power supply.
Preferably, the external operational amplifier with analog interface of the RCA interface block.
Preferably, the external operational amplifier with S/PDIF interface of the S/PDIF interface block.
Preferably, the external operational amplifier with IIS interface of the IIS interface block.
Preferably, the MOST decoder model OS81050, the dsp processor model ADSP21489, it is described
Microprocessor is STM32F103 series monolithic；DAC converter model AD1938.
The utility model use above technical scheme, at least have it is following the utility model has the advantages that
This automobile audio circuit provided by the utility model can believe the light number that former Main Engine exports due to having
The MOST bus interface seat of electric digital signal number is converted to, and to the MOST decoder that electric digital signal is decoded, so not
With former vehicle power amplifier is dismantled, as long as finding the MOST bus delivery outlet of former vehicle, this automobile provided by the utility model is directly plugged
The repacking of acoustics circuit can be completed in acoustics circuit.Not only repacking is convenient, but also since repacking circuit structure is simple, route cloth
Line is few, can effectively contain audio signal loss, promotes the musical qualities of automobile audio, and user experience is high.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic block diagram for the automobile audio circuit that the former logo that the utility model background technique provides is matched；
Fig. 2 is the schematic block diagram for the improved automobile audio circuit of the prior art that the utility model background technique provides；
Fig. 3 is a kind of schematic block diagram for automobile audio circuit that an embodiment of the present invention provides；
Fig. 4 is a kind of schematic block diagram for automobile audio circuit that another embodiment of the utility model provides；
Fig. 5 is the schematic block diagram for the power module that another embodiment of the utility model provides.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, below by the technology to the utility model
Scheme is described in detail.Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not before making creative work
Obtained all other embodiment is put, the range that the utility model is protected is belonged to.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Referring to Fig. 3, a kind of automobile audio circuit of an embodiment of the present invention offer, comprising: MOST bus interface seat
1, MOST decoder 2, microprocessor 3, dsp processor 4, DAC converter 5, wherein
The MOST bus interface seat 1 is connected by MOST bus with former Main Engine, the light for exporting former Main Engine
Digital signal is converted to electric digital signal；
The MOST decoder 2, input terminal are connected with the MOST bus interface seat 1, output end and the dsp processor
4 are connected, and control terminal is connected with the microprocessor 3, for the electric digital signal to be decoded, export decoded electric number
Word signal；
The dsp processor 4, control terminal are connected with the microprocessor 3, for carrying out to decoded electric digital signal
Processing, output at least digital audio and video signals all the way；
The DAC converter 5 is connected with the dsp processor 4, turns for carrying out digital-to-analogue to the digital audio and video signals
It changes, exports analog audio signal.
This automobile audio circuit provided by the utility model can believe the light number that former Main Engine exports due to having
The MOST bus interface seat of electric digital signal number is converted to, and to the MOST decoder that electric digital signal is decoded, so not
With former vehicle power amplifier is dismantled, as long as finding the MOST bus delivery outlet of former vehicle, this automobile provided by the utility model is directly plugged
The repacking of acoustics circuit can be completed in acoustics circuit.Not only repacking is convenient, but also since repacking circuit structure is simple, route cloth
Line is few, can effectively contain audio signal loss, promotes the musical qualities of automobile audio, and user experience is high.
Referring to fig. 4, it is preferable that the automobile audio circuit, further includes: S/PDIF interface block 6, the dsp processor 4 are defeated
At least two-way digital audio and video signals out, wherein digital audio and video signals connect the input terminal of the DAC converter 5, another way all the way
Digital audio and video signals connect the S/PDIF interface block 6.
Preferably, the automobile audio circuit, further includes: IIS interface block 7, the dsp processor 4 export at least three tunnels
Digital audio and video signals, wherein digital audio and video signals connect the input terminal of the DAC converter 5, the second railway digital audio letter all the way
Number connection S/PDIF interface block 6, third railway digital audio signal connect the IIS interface block 7.
It is understood that the understanding of MOST technology, DSP processing technique, DAC switch technology, automotive communication protocol technology
And utilization, these technologies are all mature technologies, technical solution provided by the utility model is substantially to the reasonable of these technologies
Application combination, design a kind of product of novel practical.Microprocessor MOST decoder and dsp processor are managed and
Control；MOST decoder receives original MOST data and is decoded, DSP is conveyed to after decoding according to the control of microprocessor
Processor；Dsp processor is handled audio according to the control of microprocessor, and (including volume is adjusted, EQ is adjusted, front and back
Balance adjustment, left-right balance adjusting etc.), point three kinds of formats outputs after processing；The first via is by DAC converter output simulation letter
Number；Second tunnel exports S/PDIF audio signal；Third road exports IIS audio signal.This automobile sound provided by the utility model
Circuit is rung, the audio signal output interface of different size can be provided, can be with the speaker of external different model, user's selection is more,
Experience Degree is high.
Preferably, the automobile audio circuit, further includes: the 12V DC electricity of power module, the power module and former vehicle
Output end connection, for the 12V DC electricity to be respectively converted into the MOST bus interface seat, MOST decoder, micro process
Device, dsp processor, DAC converter operating voltage.
Preferably, the automobile audio circuit, further includes: RCA interface block 8, the RCA interface block 8 and DAC are converted
The output end of device 5 is connected.
Preferably, the power module, comprising: decompression conversion module 9；The decompression conversion module 9, being used for will be described
12V DC electricity is converted to 5V direct current, powers for the DAC converter 5.
Referring to Fig. 5, it is preferable that the power module, further includes: voltage-stablizer 10；The voltage-stablizer 10 is used for the 5V
Direct current is converted to 3.3V and 2.5V direct current, powers for the MOST decoder 2；It is also used to be converted in the 5V direct current
3.3V and 1.1V direct current is powered for the dsp processor 4；It is also used to the 5V direct current being converted to 3.3V direct current, is
The MOST bus interface seat 1 and microprocessor 3 are powered.
Preferably, the decompression conversion module is Switching Power Supply MP1584, and the voltage-stablizer is linear power supply AMS1117 system
Column.The advantages of Switching Power Supply be it is high-efficient, calorific value is small, electric current is big；The characteristics of linear power supply is Wen Bo little.It is got from former vehicle
After 12V DC electricity, used by supplying each module after MP1584 and AMS1117 transformation.Power module provided by the utility model,
Powered stable, highly-safe, user experience is high.
Preferably, the external operational amplifier with analog interface of the RCA interface block 8.
Preferably, the external operational amplifier with S/PDIF interface of the S/PDIF interface block 6.
Preferably, the IIS interface block external 7 has the operational amplifier of IIS interface.
Preferably, the model OS81050 of the MOST decoder 2, the model of the dsp processor 4
ADSP21489, the microprocessor 3 are STM32F103 series monolithic；The model AD1938 of DAC converter 5.
It is understood that microprocessor uses the STM32F103 series monolithic of ST company, which integrates IIC
And UART.IIC is used for and the communication of MOST decoder, controls MOST decoder；UART is used for and dsp processor communication,
Dsp processor is controlled；The crystal oscillator of single-chip microcontroller is 8MHz.
For dsp processor using the ADSP21489 of the SHARC series of ADI company, which is high-end automobile sound
Ring processing chip；Dsp processor integrates IIS bus, spi bus, UART serial ports, S/PDIF bus and carries out at various audio algorithms
Reason, such as volume plus-minus, anterior-posterior balance, left-right balance, EQ are adjusted.
MOST decoder uses the optical fiber decoding chip OS81050 of U.S. Wei Xin company；DAC converter is using ADI's
AD1938, the chip can export 8 road DAC signals.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replacement, it should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be with the power
Subject to the protection scope that benefit requires.Term " first ", " second " are used for description purposes only, and are not understood to indicate or imply phase
To importance.Term " multiple " refers to two or more, unless otherwise restricted clearly.
Claims (10)
1. a kind of automobile audio circuit characterized by comprising MOST bus interface seat, MOST decoder, microprocessor, DSP
Processor, DAC converter, wherein
The MOST bus interface seat is connected by MOST bus with former Main Engine, the light number for exporting former Main Engine
Signal is converted to electric digital signal；
The MOST decoder, input terminal are connected with the MOST bus interface seat, and output end is connected with the dsp processor,
Control terminal is connected with the microprocessor, for the electric digital signal to be decoded, exports decoded electric digital signal；
The dsp processor, control terminal are connected with the microprocessor, for handling decoded electric digital signal,
Output at least digital audio and video signals all the way；
The DAC converter is connected with the dsp processor, for carrying out digital-to-analogue conversion, output to the digital audio and video signals
Analog audio signal.
2. automobile audio circuit according to claim 1, which is characterized in that further include: S/PDIF interface block, the DSP
Processor output at least two-way digital audio and video signals, wherein digital audio and video signals connect the input terminal of the DAC converter all the way,
Another way digital audio and video signals connect the S/PDIF interface block.
3. automobile audio circuit according to claim 2, which is characterized in that further include: IIS interface block, the DSP processing
Device exports at least three railway digital audio signals, wherein digital audio and video signals connect the input terminal of the DAC converter all the way, second
Railway digital audio signal connects the S/PDIF interface block, and third railway digital audio signal connects the IIS interface block.
4. automobile audio circuit according to claim 1, which is characterized in that further include: RCA interface block, the RCA interface
Seat is connected with the output end of the DAC converter.
5. automobile audio circuit according to claim 1, which is characterized in that further include: power module, the power module
Connect with the 12V DC electricity output end of former vehicle, for by the 12V DC electricity be respectively converted into the MOST bus interface seat,
MOST decoder, microprocessor, dsp processor, DAC converter operating voltage.
6. automobile audio circuit according to claim 5, which is characterized in that the power module, comprising: decompression modulus of conversion
Block；The decompression conversion module is powered for the 12V DC electricity to be converted to 5V direct current for the DAC converter.
7. automobile audio circuit according to claim 6, which is characterized in that the power module, further includes: voltage-stablizer；
The voltage-stablizer is powered for the 5V direct current to be converted to 3.3V and 2.5V direct current for the MOST decoder；Also use
In the 5V direct current is converted to 3.3V and 1.1V direct current, power for the dsp processor；It is also used to the 5V direct current
Electricity is converted to 3.3V direct current, is the MOST bus interface seat and microprocessor power supply.
8. automobile audio circuit according to claim 4, which is characterized in that the RCA interface block is external, and there is simulation to connect
The operational amplifier of mouth.
9. automobile audio circuit according to claim 2, which is characterized in that the S/PDIF interface block is external to have S/
The operational amplifier of PDIF interface.
10. automobile audio circuit according to claim 3, which is characterized in that the IIS interface block is external to be connect with IIS
The operational amplifier of mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821066508.1U CN208300007U (en) | 2018-07-05 | 2018-07-05 | A kind of automobile audio circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821066508.1U CN208300007U (en) | 2018-07-05 | 2018-07-05 | A kind of automobile audio circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208300007U true CN208300007U (en) | 2018-12-28 |
Family
ID=64700983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821066508.1U Expired - Fee Related CN208300007U (en) | 2018-07-05 | 2018-07-05 | A kind of automobile audio circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208300007U (en) |
-
2018
- 2018-07-05 CN CN201821066508.1U patent/CN208300007U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181228 Termination date: 20210705 |
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| CF01 | Termination of patent right due to non-payment of annual fee |