CN210536929U

CN210536929U - Audio processing circuit with AUX input function of automobile sound equipment for reproducing four-channel effect

Info

Publication number: CN210536929U
Application number: CN201921430471.0U
Authority: CN
Inventors: 周铁; 杨海声; 邱全民
Original assignee: Shenzhen Shilixin Electronic Co Ltd
Current assignee: Shenzhen Shilixin Electronic Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-05-15
Anticipated expiration: 2029-08-30

Abstract

The utility model provides an audio processing circuit of car stereo AUX input function reappearing four-channel effect, including discrete device amplitude adjustment function module, analog switch, audio processing chip and audio power amplifier, discrete device amplitude adjustment function module links to each other with analog switch, discrete device amplitude adjustment function module carries out the audio mixing input to analog switch with the audio frequency of the left sound channel and the right sound channel of AUX input; the analog switch distributes input audio to obtain four paths of single-ended output audio; the analog switch is connected with the audio processing chip, the four paths of single-ended output audio are input to the audio processing chip through the analog switch, the front left audio, the front right audio, the rear left audio and the rear right audio are transmitted to the audio power amplifier through the audio processing chip, and the four loudspeaker audio are restored after being amplified by the audio power amplifier. The utility model has the advantages that: the utility model relates to an audio processing circuit that commonality and reliability are high has obtained very good technological effect.

Description

Audio processing circuit with AUX input function of automobile sound equipment for reproducing four-channel effect

Technical Field

The utility model relates to the field of electronic technology, especially, relate to an audio processing circuit that car stereo AUX input function reappears four-channel effect.

Background

Car audio systems are typically provided with one pair of loudspeakers, two pairs of loudspeakers, or more loudspeakers, for the purpose of implementing stereo or surround sound. The layout of the automobile horn is usually a pair of midrange horns (a pair of tweeters are added) at the front door and a pair of midrange horns at the rear door. In order to achieve different tone quality effects, the sound system may employ active frequency division, and may individually adjust and process the sound effect of each speaker, and in order to save cost and simplify the installation process, passive frequency division is generally used. With the continuous development of multimedia, the car audio system has been developed from the early standard radio function to the cassette player, CD player, DVD player in order to enrich and meet the demands of different users. The number of input interfaces for external music is increasing, and there are multimedia interfaces such as bluetooth music, USB interface, SD card, TF card, IPOD interface, and AUX interface.

Although the vehicle navigation sound system on the market at present has an AUX audio input interface, the sound input by the AUX only supports that two front speakers have sound and two rear speakers do not have sound, so the sound effect is not ideal and troubles are brought to users.

SUMMERY OF THE UTILITY MODEL

In order to solve the sound of AUX input among the prior art, two loudspeaker of back door do not have the problem of sound, the utility model provides an audio processing circuit.

The utility model provides an audio processing circuit that car stereo AUX input function reappears four sound channel effect, including discrete device amplitude modulation functional module, analog switch, audio frequency processing chip and audio power amplifier, discrete device amplitude modulation functional module is used for carrying out amplitude modulation with the single-ended audio frequency of the left sound channel of AUX input and right sound channel, discrete device amplitude modulation functional module with analog switch links to each other, discrete device amplitude modulation functional module carries out the audio mixing input with the audio frequency of the left sound channel of AUX input and right sound channel to analog switch; the analog switch distributes input audio to obtain four paths of single-ended output audio; the analog switch is connected with the audio processing chip, the analog switch inputs four paths of single-ended output audio into the audio processing chip, and the audio processing chip processes the four paths of single-ended output audio to obtain four sound channels, namely a front left sound channel, a front right sound channel, a rear left sound channel and a rear right sound channel; the audio processing chip is connected with the audio power amplifier, the audio processing chip transmits four audio frequencies of front left, front right, back left and back right to the audio power amplifier, and the four audio frequencies of the loudspeakers are restored after the four audio frequencies are amplified by the audio power amplifier.

As a further improvement of the present invention, the analog switch is a CD4052 multi-channel analog switch chip.

As the utility model discloses a further improvement, the audio frequency of the left channel of AUX input and right channel carries out the audio mixing and inputs input to CD4052 multichannel analog switch chip's input X0 and Y0, distributes the input audio frequency through CD4052 multichannel analog switch chip, obtains ADC0, ADC1, ADC2, ADC3 four ways single-ended output audio frequency.

As a further improvement of the utility model, the audio processing chip comprises an analog audio switch input interface, a stereo analog-to-digital conversion module, an audio processor and a stereo digital-to-analog conversion module which are connected in sequence, the ADC0, the ADC1, the ADC2 and the ADC3 are input into the input interface of the analog audio switch in a four-way single-ended mode, the stereo analog-to-digital conversion module converts the input analog audio into digital audio, the digital audio of four channels is processed separately through the audio processor, accurately distributing single-ended audio according to the relative positions of the loudspeakers of the automobile sound system, defining four audio frequencies of front left, front right, back left and back right to obtain four loudspeaker sounds of front left, front right, back left and back right, and outputting the four loudspeaker sounds to the stereo digital-to-analog conversion module, the stereo digital-to-analog conversion module respectively outputs single-ended four-path analog audio to the input end of the power amplifier.

As the utility model discloses a further improvement, audio power amplifier is the special high-power AB class power amplifier chip of car audio system, and single-ended four ways audio frequency is enlargied through the power amplifier respectively, promotes four loudspeaker phonations.

The utility model has the advantages that: the utility model relates to an audio processing circuit that commonality and reliability are high can two loudspeaker stereo effects of perfect reproduction back door, has gained very good technological effect.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a circuit diagram of the discrete device amplitude adjustment function module of the present invention;

fig. 3 is a circuit diagram of an analog switch of the present invention;

FIG. 4 is a schematic block diagram of an audio processing chip according to the present invention;

fig. 5 is a circuit diagram of the audio power amplifier of the present invention.

Detailed Description

As shown in fig. 1, the utility model discloses an audio processing circuit of four channel effect is reappeared to car stereo AUX input function, including consecutive discrete device amplitude modulation functional module 10, analog switch 20, audio processing chip 30 and audio power amplifier 40.

Fig. 2 is a circuit diagram of the discrete device amplitude adjustment function module 10, and the discrete device amplitude adjustment function module 10 is configured to amplitude-adjust single-ended audio of the left channel and the right channel of the AUX input, and respectively mix and input the single-ended audio to the analog switch 20 in parallel.

Fig. 3 is a circuit diagram of the analog switch 20 of the present invention, and the analog switch 20 employs a CD4052 multi-channel analog switch chip, for example, fig. 4 is a logic truth table of the CD4052 multi-channel analog switch chip. The single-ended left channel audio and the single-ended right channel audio are mixed before being input into the analog switch 20, are respectively input into the input ends X0 and Y0 of the CD4052 multi-channel analog switch chip, and are distributed through the CD4052 multi-channel analog switch chip, so that four paths of single-ended output audio of the ADC0, the ADC1, the ADC2 and the ADC3 are obtained. Although 4 channels of audio are obtained, the audio can only be divided into a left channel and a right channel, that is, the left channel has two single-ended outputs, and the right channel has two single-ended outputs, and the front left, the rear left, the front right and the rear right of the automobile horn cannot be distinguished.

		SWA	SWB
				O	4CH	O	O
1	NC	1	O
				2	NC	O	1
3	NC	1	1

The table is a logic truth table of a CD4052 multi-channel analog switch chip

As shown in fig. 4, the audio processing chip 30 includes an analog audio switch input interface 31, a stereo analog-to-digital conversion module 32, an audio processor 33, and a stereo digital-to-analog conversion module 34, which are connected in sequence, four single-ended outputs of the ADC0, the ADC1, the ADC2, and the ADC3 are input to the analog audio switch input interface 31 of the audio processing chip 30, the stereo analog-to-digital conversion module 32 converts the input analog audio into digital audio, the digital audio of the four channels is processed separately by the audio processor 33, the single-ended outputs are precisely distributed according to the relative positions of speakers of the car audio system, four front left, front right, rear left, and rear right audio are defined, four front left, front right, rear left, and rear right speaker sounds are obtained, and a user can process and adjust each channel separately by the car audio system. The front left, front right, back left and back right audio are output to the stereo digital-to-analog conversion module 34, and the stereo digital-to-analog conversion module 34 outputs the single-ended four analog audio to the input end of the power amplifier 40.

As shown in fig. 5, the audio power amplifier 40 selects a special high-power class AB power amplifier chip for an automobile audio system, and single-ended four-way audio is amplified by a power amplifier to output 4x 28W/4 Ω @ 14.4V,1kHz, 10%, and push four speakers to sound.

The utility model relates to an audio processing circuit that commonality and reliability are high can two loudspeaker stereo effects of perfect reproduction back door, has gained very good technological effect.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. An audio processing circuit for reproducing four-channel effect by an AUX input function of an automobile sound is characterized in that: the device comprises a discrete device amplitude adjusting function module, an analog switch, an audio processing chip and an audio power amplifier, wherein the discrete device amplitude adjusting function module is used for adjusting the amplitude of single-ended audio of a left channel and a right channel input by AUX, the discrete device amplitude adjusting function module is connected with the analog switch, and the discrete device amplitude adjusting function module is used for mixing the audio of the left channel and the audio of the right channel input by AUX and inputting the audio into the analog switch; the analog switch distributes input audio to obtain four paths of single-ended output audio; the analog switch is connected with the audio processing chip, the analog switch inputs four paths of single-ended output audio into the audio processing chip, and the audio processing chip processes the four paths of single-ended output audio to obtain four sound channels, namely a front left sound channel, a front right sound channel, a rear left sound channel and a rear right sound channel; the audio processing chip is connected with the audio power amplifier, the audio processing chip transmits four audio frequencies of front left, front right, back left and back right to the audio power amplifier, and the four audio frequencies of the loudspeakers are restored after the four audio frequencies are amplified by the audio power amplifier.

2. The audio processing circuit of claim 1, wherein: the analog switch is a CD4052 multi-channel analog switch chip.

3. The audio processing circuit of claim 2, wherein: and audio of the left channel and the audio of the right channel input by AUX are mixed and input to input ends X0 and Y0 of a CD4052 multi-channel analog switch chip, and the input audio is distributed by the CD4052 multi-channel analog switch chip to obtain four paths of single-ended output audio of ADC0, ADC1, ADC2 and ADC 3.

4. The audio processing circuit of claim 3, wherein: the audio processing chip comprises an analog audio switch input interface, a stereo analog-to-digital conversion module, an audio processor and a stereo digital-to-analog conversion module which are sequentially connected, wherein four paths of single-ended audio of ADC0, ADC1, ADC2 and ADC3 are input to the analog audio switch input interface, the stereo analog-to-digital conversion module converts the input analog audio into digital audio, the digital audio of the four channels is independently processed by the audio processor, the single-ended audio is accurately distributed according to the relative positions of loudspeakers of the automobile sound system, four paths of front left, front right, rear left and rear right audio are defined, four paths of front left, front right, rear left and rear right loudspeaker sounds are obtained and output to the stereo digital-to-analog conversion module, and the stereo digital-to-analog conversion module respectively outputs the four paths of single-ended analog audio to the input end of the power amplifier.

5. The audio processing circuit of claim 3, wherein: the audio power amplifier is a special high-power AB type power amplifier chip for an automobile sound system, and single-ended four-way audio is amplified through power amplifiers respectively to push four loudspeakers to produce sound.