CN203708489U - Audio frequency processing circuit reducing loss and vehicle mounted electronic device - Google Patents
Audio frequency processing circuit reducing loss and vehicle mounted electronic device Download PDFInfo
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- CN203708489U CN203708489U CN201320880490.XU CN201320880490U CN203708489U CN 203708489 U CN203708489 U CN 203708489U CN 201320880490 U CN201320880490 U CN 201320880490U CN 203708489 U CN203708489 U CN 203708489U
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- audio frequency
- amplifier
- processing circuit
- power amplifier
- frequency processing
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Abstract
The utility model relates to an audio frequency processing circuit reducing loss and a vehicle mounted electronic device; the audio frequency processing circuit reducing loss comprises a microprocessor, an audio frequency processor, a precision operational-amplifier, a power amplifier and a loudspeaker; the microprocessor is connected with the audio frequency processor through an I2C interface; the audio frequency processor is connected with the precision operational-amplifier; the precision operational-amplifier is connected with the power amplifier; a general input/output pin of the audio frequency processor is connected with a mute/standby pin of the power amplifier; the power amplifier is connected with the loudspeaker; the beneficial effects are that the audio frequency processor can detect whether an input signal exists or not; if no input signal is spotted, the audio frequency process can control the power amplifier to be in a mute/standby mode, thereby reducing loss.
Description
Technical field
The utility model relates to power amplifier, relates in particular to a kind of audio frequency processing circuit reducing the wastage and vehicle electronic device.
Background technology
Power amplifier is called for short power amplifier, be commonly called as " sound amplifier ", equipment the most basic in sound system, its task is that power amplifier is usually used in vehicle audio amplifying to drive loud speaker to sound from the ultra-weak electronic signal of signal source (being from sound console in professional sound system).
Along with vehicle electronic device is more and more, the power problems of power amplifier becomes and is on the rise.For example, if the quiescent current of audio-frequency power amplifier reaches 200 mA, while adopting 12 V power supply, quiescent dissipation is just up to 2.4 W.The power consumption of vehicle electronic device is too large, will shorten the useful life of battery, increases cost.
Summary of the invention
In order to solve the problems of the prior art, the utility model provides a kind of audio frequency processing circuit reducing the wastage and vehicle electronic device.
The utility model provides a kind of audio frequency processing circuit reducing the wastage, comprise microcontroller, audio process, precision operational-amplifier, power amplifier and loud speaker, wherein, described microcontroller is connected with described audio process by I2C interface, described audio process is connected with described precision operational-amplifier, described precision operational-amplifier is connected with described power amplifier, universal input/the output pin of described audio process and described power amplifier quiet/standby pin is connected, described power amplifier is connected with described loud speaker.
As further improvement of the utility model, described audio process is ADAU1401 audio process.
As further improvement of the utility model, described precision operational-amplifier is ADA4075-2 precision operational-amplifier.
As further improvement of the utility model, between described audio process and described precision operational-amplifier, be connected with capacitor C 1.
As further improvement of the utility model, between described precision operational-amplifier and described power amplifier, be connected with capacitor C 2.
As further improvement of the utility model, described loud speaker has two at least.
As further improvement of the utility model, described loud speaker has four.
The utility model also provides a kind of vehicle electronic device, comprises the audio frequency processing circuit reducing the wastage described in above-mentioned middle any one.
As further improvement of the utility model, described vehicle electronic device is vehicle audio.
The beneficial effects of the utility model are: by such scheme, can detect whether there is input signal by audio process, in the time there is no input signal, can be placed in quiet/standby mode by audio process power ratio control amplifier, to reduce the wastage.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of a kind of audio frequency processing circuit reducing the wastage of the utility model.
Embodiment
Below in conjunction with accompanying drawing explanation and embodiment, the utility model is further illustrated.
Drawing reference numeral in Fig. 1 is: microcontroller 1; Audio process 2; Precision operational-amplifier 3; Power amplifier 4; Loud speaker 5.
As shown in Figure 1, a kind of audio frequency processing circuit reducing the wastage, comprise microcontroller 1, audio process 2, precision operational-amplifier 3, power amplifier 4 and loud speaker 5, wherein, described microcontroller 1 is connected with described audio process 2 by I2C interface, described audio process 2 is connected with described precision operational-amplifier 3, described precision operational-amplifier 3 is connected with described power amplifier 4, universal input/the output pin (being GPIO1 pin) of described audio process 2 and described power amplifier 4 quiet/standby pin (being MUTE STANDBY pin) is connected, described power amplifier 4 is connected with described loud speaker 5, can detect whether there is input signal by audio process 2, in the time there is no input signal, can be placed in quiet/standby mode by quiet/standby pin power ratio control amplifier 4 by audio process 2, to reduce the wastage.
As shown in Figure 1, described audio process 2 is preferably ADAU1401 audio process, can utilize the root mean square of ADAU1401 audio process to detect and GPIO control function reduces the power amplifier loss of system.
As shown in Figure 1, ADAU1401 is a complete single-chip audio system, comprises completely programmable 28/56 audio frequency DSP(digital signal processor), the control interface of analog to digital converter (ADC), digital to analog converter (DAC) and similar microcontroller.Signal processing comprises that equilibrium, bass enhancing, multiband dynamic process, delay compensation, loud speaker compensate and stereo sound field is widened.This treatment technology can compare favourably with the effect of high-end studio apparatus, can make up the caused distortion of physical constraints due to loud speaker, power amplifier and acoustic surrounding, thereby obviously improves the power consumption of tonequality and reduction system.
As shown in Figure 1, described precision operational-amplifier 3 is preferably ADA4075-2 precision operational-amplifier.
As shown in Figure 1, between described audio process 2 and described precision operational-amplifier 3, be connected with capacitor C 1, wherein capacitor C 1 is preferably 10UF.
As shown in Figure 1, between described precision operational-amplifier 2 and described power amplifier 3, be connected with capacitor C 2, wherein capacitor C 2 is preferably 10UF.
As shown in Figure 1, described loud speaker 5 has two at least.
As shown in Figure 1, described loud speaker 5 preferably has four.
The utility model also provides a kind of vehicle electronic device, comprises the audio frequency processing circuit reducing the wastage described in above-mentioned middle any one.
Described vehicle electronic device is vehicle audio.
A kind of audio frequency processing circuit reducing the wastage and vehicle electronic device that the utility model provides, ADAU1401 audio process is as audio post-processor, except sampling, conversion, audio signal digit are processed and generate extra loudspeaker channel, ADAU1401 audio process also has universal input/output (GPIO) pin and can be used for external control, microcontroller 1(MCU) communicate by I2C interface and ADAU1401 audio process, simulation output drives a low pass filter/buffer level that adopts ADA4075-2 precision operational-amplifier.Holding wire control power amplifier 4 between ADAU1401 audio process and power amplifier 4 quiet/standby pin.Under normal acquiescence mode of operation, opener GPIO1 pin is set to high level by 10 k Ω pull-up resistors.ADAU1401 audio process has root-mean-squared measuring ability, can determine whether to exist input signal.In the time there is no input signal, GPIO1 pin becomes low level, and power amplifier 4 is placed in quiet/standby mode, thereby loud speaker 5 do not have noise output, and the stand-by power consumption of power amplifier 4 is also very low simultaneously.When detecting higher than predetermined threshold (Li as – 45 dB) input signal time, GPIO1 pin becomes high level, power amplifier 4 is normally worked.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.
Claims (9)
1. the audio frequency processing circuit reducing the wastage, it is characterized in that: comprise microcontroller, audio process, precision operational-amplifier, power amplifier and loud speaker, wherein, described microcontroller is connected with described audio process by I2C interface, described audio process is connected with described precision operational-amplifier, described precision operational-amplifier is connected with described power amplifier, universal input/the output pin of described audio process and described power amplifier quiet/standby pin is connected, described power amplifier is connected with described loud speaker.
2. the audio frequency processing circuit reducing the wastage according to claim 1, is characterized in that: described audio process is ADAU1401 audio process.
3. the audio frequency processing circuit reducing the wastage according to claim 1, is characterized in that: described precision operational-amplifier is ADA4075-2 precision operational-amplifier.
4. the audio frequency processing circuit reducing the wastage according to claim 1, is characterized in that: between described audio process and described precision operational-amplifier, be connected with capacitor C 1.
5. the audio frequency processing circuit reducing the wastage according to claim 1, is characterized in that: between described precision operational-amplifier and described power amplifier, be connected with capacitor C 2.
6. the audio frequency processing circuit reducing the wastage according to claim 1, is characterized in that: described loud speaker has two at least.
7. the audio frequency processing circuit reducing the wastage according to claim 1, is characterized in that: described loud speaker has four.
8. a vehicle electronic device, is characterized in that: comprise the audio frequency processing circuit reducing the wastage described in any one in claim 1 to 7.
9. vehicle electronic device according to claim 8, is characterized in that: described vehicle electronic device is vehicle audio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880490.XU CN203708489U (en) | 2013-12-30 | 2013-12-30 | Audio frequency processing circuit reducing loss and vehicle mounted electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880490.XU CN203708489U (en) | 2013-12-30 | 2013-12-30 | Audio frequency processing circuit reducing loss and vehicle mounted electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203708489U true CN203708489U (en) | 2014-07-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320880490.XU Expired - Fee Related CN203708489U (en) | 2013-12-30 | 2013-12-30 | Audio frequency processing circuit reducing loss and vehicle mounted electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203708489U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677778A (en) * | 2019-10-10 | 2020-01-10 | 深圳市九洲电器有限公司 | Audio mute control circuit and electronic equipment |
-
2013
- 2013-12-30 CN CN201320880490.XU patent/CN203708489U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677778A (en) * | 2019-10-10 | 2020-01-10 | 深圳市九洲电器有限公司 | Audio mute control circuit and electronic equipment |
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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: 20140709 Termination date: 20171230 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |