CN205725661U - A kind of automobile controls and power amplification circuit with DSP digital audio - Google Patents
A kind of automobile controls and power amplification circuit with DSP digital audio Download PDFInfo
- Publication number
- CN205725661U CN205725661U CN201620405465.XU CN201620405465U CN205725661U CN 205725661 U CN205725661 U CN 205725661U CN 201620405465 U CN201620405465 U CN 201620405465U CN 205725661 U CN205725661 U CN 205725661U
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- digital audio
- dsp digital
- circuit
- automobile
- power amplifier
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Abstract
This utility model is that a kind of automobile DSP digital audio controls and power amplification circuit, this circuit includes DSP digital audio control chip and power amplifier chip, described DSP digital audio control chip is connected to digital audio input port and analogue audio frequency input port, DSP digital audio control chip has been followed by power amplifier chip, and described DSP digital audio control chip and power amplifier chip are all connected to CPU.This utility model simple structure, it is easy to accomplish, stable and reliable for performance, and ensure that the audio-frequency information that output is good, there is good music effect.
Description
Technical field
This utility model relates to circuit, says accurately and is a kind of DSP digital audio for automobile and power is put
Big circuit.
Background technology
It is used in mixed way along with the function of auto navigation and amusing products is highly integrated and digital, analog circuit is intensive
Deng fast-developing, universal in particular with intelligent automobile navigation and amusing products, audio frequency is play as automobile
Navigation and the main contents of amusing products, become people and drive requisite part of going on a journey；But it is existing
Auto navigation and amusing products, all use the simulation sound effect fallen behind and the transmission of analogue audio frequency weak signal, amplify,
Make weak signal transmission and the distortion of amplification generation and noise relatively big (more than 1%), and make Signal separator degree and guarantor
True degree the lowest (less than 70dB).
Patent application 201220330695.6 discloses a kind of circuit improving acoustical signal dynamic property, including
Power amplifier and the single-chip microcomputer being connected with PA signal, also include process EQ
One DSP, the 2nd DSP to audio effect processing, optical fiber/coaxial processor, audio input circuit and
Audio output circuit, a described DSP and the 2nd DSP signal connect, described optical fiber/coaxially process
Device is connected with a DSP and the 2nd DSP signal respectively, and described difference processing circuit on one side connects optical fiber
/ coaxial processor, the other end connects single-chip microcomputer, and described audio input circuit is connected with single-chip microcomputer, described sound
Frequently output circuit and a DSP connect.Although this application can improve the dynamic range of audio frequency, strengthen mould
Intending audio frequency input audio electronics sound system performance, but structure is complicated, hardware cost is high.
To this end, in the urgent need to a kind of that there is good music effect, simple and practical, easy to make and cost
Cheap automobile digital audio and power amplification circuit.
Summary of the invention
For the problems referred to above, this utility model provides a kind of automobile DSP digital audio control and power is put
Big circuit, this circuit structure is simple, it is easy to accomplish, stable and reliable for performance, and ensure that output is good
Audio-frequency information, has good music effect.
Another mesh ground of the present utility model is to provide a kind of automobile DSP digital audio to control and power is put
Big circuit, this circuit can decrease distortion and noise, improves Signal separator degree and fidelity, reduces vapour
The cost of car Audio Processing.
For reaching above-mentioned mesh ground, this utility model is achieved through the following technical solutions.
A kind of automobile controls and power amplification circuit with DSP digital audio, it is characterised in that this circuit includes
DSP digital audio control chip and power amplifier chip, described DSP digital audio control chip is connected to number
Word audio input port and analogue audio frequency input port, DSP digital audio control chip has been followed by power amplification
Chip, and described DSP digital audio control chip and power amplifier chip be all connected to CPU.
Described DSP digital audio control chip is AK7757, is connected to power amplification core by I2C bus
Sheet.
Described power amplifier chip is TDA7802.
Described power amplifier chip is to be integrated with DAC (Digital to analog converter in TDA7802
Digital analog converter).
Further, described AK7757 and TDA7802 is respectively controlled by the I2C bus of CPU；
AK7757 output I2S signal enters TDA7802,
Further, described I2S signal has two groups.2 groups of I2S signal packet of transmission are containing 4 channel audio letters
Number, inside TDA7802, carry out DAC and power amplification, to reduce distortion and noise, improve signal and divide
From degree and fidelity.
This utility model can make to stop disturbed may and saving in simulated audio signal transmitting procedure simultaneously
Operational amplifier, makes simple circuit；Simple structure, it is easy to accomplish, stable and reliable for performance, and ensure that
Export good audio-frequency information, there is good music effect.
This circuit can decrease distortion and noise, improves Signal separator degree and fidelity, reduces automobile sound
The cost that frequency processes.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams that this utility model is implemented.
Fig. 2 is the circuit diagram that this practical information is embodied as.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And embodiment, this utility model is further elaborated.Should be appreciated that described herein specifically
Embodiment, only in order to explain this utility model, is not used to limit this utility model.
Shown in Fig. 1, the circuit theory diagrams implemented for utility model, in figure, this circuit includes DSP numeral sound
Effect control chip AK7757 and power amplifier chip TDA7802, and by the I2C of ARM CPU respectively
It is controlled；This circuit and high frequency ARM CPU, multiple power sources circuit, 2G/3G/4G telecommunications radio circuit,
WIFI/ bluetooth 2.4G radio circuit etc. is intensive to be blended in same PCB, and can well avoid mutually
Interference.
Wherein, power amplifier chip TDA7802 is integrated with DAC.
AK7757 is entered and the control of TDA7802 row by CPU by I2C bus.
AK7757 output I2S signal is directly entered TDA7802, has stopped simulated audio signal transmitting procedure
In disturbed and operational amplifier may be saved, make simple circuit；Be conducive to highly the densest being blended in same
More multi-functional circuit in PCB, and can well avoid interfering.
4 channel audio signals are included, in TDA7802 in 2 groups of I2S signals of AK7757 output
Portion carries out DAC and power amplification, and this circuit is only divided by the distortion factor of TDA7802 itself, noise, signal
The distortion factor of integral product, noise, Signal separator degree and fidelity is affected from degree and fidelity, due to
The audio performance that TDA7802 itself is outstanding, the distortion factor of this circuit, noise, Signal separator degree and fidelity
It is superior to the circuit of analogue signal transmission.
In conjunction with shown in Fig. 2, the circuit diagram implemented for this utility model.In figure, AK7757 has
I2S/PCM audio input circuit and analog audio input circuit, connect the I2S/PCM audio signal in the external world respectively
Source and simulated audio signal source；Then by audio signal transmission to audio frequency DSP1 and audio frequency DSP2 at
Reason, produces 2 groups of I2S signals and exports.
2 groups of I2S signals are directly entered the I2S audio input circuit of TDA7802, are then transferred to audio frequency DAC
Carry out digital-to-analogue conversion, then export through audio power amplifying circuit.Audio amplifier circuit generally uses 4
The power amplifier of × 25W, exports FR, FL, RR and RL tetra-tunnel audio signal respectively.
Therefore, by foregoing circuit, this utility model can make to stop simulated audio signal transmitting procedure simultaneously
In disturbed and operational amplifier may be saved, make simple circuit；Simple structure, it is easy to accomplish, performance
Reliable and stable, and ensure that the audio-frequency information that output is good, there is good music effect.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model,
All any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, all should
Within being included in protection domain of the present utility model.
Claims (6)
1. an automobile controls and power amplification circuit with DSP digital audio, it is characterized in that this circuit includes DSP digital audio control chip and power amplifier chip, described DSP digital audio control chip is connected to digital audio input port and analogue audio frequency input port, DSP digital audio control chip has been followed by power amplifier chip, and described DSP digital audio control chip and power amplifier chip are all connected to CPU.
2. automobile as claimed in claim 1 controls and power amplification circuit with DSP digital audio；It is characterized in that described DSP digital audio control chip is AK7757, be connected to power amplifier chip by I2C bus.
3. automobile as claimed in claim 2 controls and power amplification circuit with DSP digital audio；It is characterized in that described power amplifier chip is TDA7802.
4. automobile as claimed in claim 3 controls and power amplification circuit with DSP digital audio；It is characterized in that described power amplifier chip is to be integrated with DAC in TDA7802.
5. automobile as claimed in claim 3 controls and power amplification circuit with DSP digital audio；It is characterized in that described AK7757 and TDA7802 is respectively controlled by the I2C bus of CPU；AK7757 output I2S signal enters TDA7802.
6. automobile as claimed in claim 5 controls and power amplification circuit with DSP digital audio；It is characterized in that described I2S signal has two groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620405465.XU CN205725661U (en) | 2016-05-05 | 2016-05-05 | A kind of automobile controls and power amplification circuit with DSP digital audio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620405465.XU CN205725661U (en) | 2016-05-05 | 2016-05-05 | A kind of automobile controls and power amplification circuit with DSP digital audio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205725661U true CN205725661U (en) | 2016-11-23 |
Family
ID=57304961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620405465.XU Expired - Fee Related CN205725661U (en) | 2016-05-05 | 2016-05-05 | A kind of automobile controls and power amplification circuit with DSP digital audio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205725661U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110782919A (en) * | 2019-11-02 | 2020-02-11 | 朝阳聚声泰（信丰）科技有限公司 | Automobile sound system intelligently matched with sound effect style and implementation method thereof |
-
2016
- 2016-05-05 CN CN201620405465.XU patent/CN205725661U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110782919A (en) * | 2019-11-02 | 2020-02-11 | 朝阳聚声泰（信丰）科技有限公司 | Automobile sound system intelligently matched with sound effect style and implementation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |