CN110248287A - A kind of audio frequency processing circuit - Google Patents
A kind of audio frequency processing circuit Download PDFInfo
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- CN110248287A CN110248287A CN201910600008.4A CN201910600008A CN110248287A CN 110248287 A CN110248287 A CN 110248287A CN 201910600008 A CN201910600008 A CN 201910600008A CN 110248287 A CN110248287 A CN 110248287A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Acoustics & Sound (AREA)
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- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a kind of audio frequency processing circuits；Including Audio Input Modules, modulus digital analog converter, audio processing modules and audio output module；Audio Input Modules include the first analog signal output, are used for input audio signal；Modulus digital analog converter includes the first input end of analog signal, the first digital signal output end, the second digital signal input end and the second analog signal output, for the first analog signal to be converted into the first digital signal, and the second digital signal is converted into the second analog signal；Audio processing modules include the first digital signal input end and the second digital signal output end, are configured with cascade multiple first filter units, there are many filter patterns for the first filter unit；First filter unit is for being filtered the first digital signal to form the second digital signal；Audio output module includes the second input end of analog signal, for exporting second analog signal.The present invention can satisfy more harsh application environment, expand use scope.
Description
Technical field
The present embodiments relate to audio signal processing technique more particularly to a kind of audio frequency processing circuits.
Background technique
As the improvement of people's living standards, to output audio quality requirement it is also higher and higher, accordingly to audio at
The performance requirement for managing circuit is also higher and higher.
However the audio frequency processing circuit of the prior art can not carry out the processing of various modes, applied field to the audio of input
Scape is limited, the application demand being unable to satisfy under harsh environment.
Summary of the invention
The present invention provides a kind of audio frequency processing circuit, to meet the audio output demand under harsh environment.
In a first aspect, the audio frequency processing circuit includes: audio the embodiment of the invention provides a kind of audio frequency processing circuit
Input module, modulus digital analog converter, audio processing modules and audio output module；
The Audio Input Modules include the first analog signal output, and the Audio Input Modules are believed for input audio
Number；
The modulus digital analog converter includes the first input end of analog signal, the first digital signal output end, the second number
Signal input part and the second analog signal output, institute modulus digital analog converter are used to be inputted by the Audio Input Modules
First analog signal is converted into the first digital signal, and the second digital signal inputted by the audio processing modules is converted into
Second analog signal；
The audio processing modules include the first digital signal input end and the second digital signal output end, at the audio
It manages module and is configured with cascade multiple first filter units, there are many filter patterns for each first filter unit；It is described
First filter unit is for being filtered first digital signal to form second digital signal；
The audio output module includes the second input end of analog signal, and the audio output module is for exporting described the
Two analog signals.
Optionally, each first filter unit can be configured to parametric equalization filter, high-pass filter, low pass
Filter, overhead filter or lower frame filter.
Optionally, the audio processing modules include digital audio processor and controller；
The digital signal input end of the digital audio processor is electrically connected with first digital signal input end, described
The digital signal output end of digital audio processor is electrically connected with second digital signal output end, the digital audio processing
The control terminal of device is electrically connected with the controller；
The digital audio processor is used to be set to the digital audio according to the adjustment of the control signal of the controller
The filter patterns of first filter unit in processor.
It optionally, further include echo processor, the echo processor is electrically connected with the digital audio processor, described
Echo processor will be for that will be adjusted to mono echo, stereo echo from the received audio signal of the digital audio processor
Or left and right echo and export to the digital audio processor to form second digital signal.
It optionally, further include reverberation processor, the reverberation processor is electrically connected with the digital audio processor, described
Reverberation processor is used to adjust the reverberation effect from the received audio signal of the digital audio processor.
It optionally, further include optical fiber input module, the output end of the optical fiber input module and the digital audio processing
The fiber-optic signal input terminal of device is electrically connected, and the optical fiber input module is for exporting fiber-optic signal to the digital audio processing
Device.
Optionally, the Audio Input Modules include the first microphone input module, the second microphone input module, first music
Input module and the second music input module；
The output end of the first microphone input module and the second microphone input module turns with the modulus digital-to-analogue
Parallel operation electrical connection, the first microphone input module and the second microphone input module are used to for microphone signal being input to described
Modulus digital analog converter；
The output end of the first music input module and the second music input module turns with the modulus digital-to-analogue
Parallel operation electrical connection, the first music input module and the second music input module are used to for music signal being input to described
Modulus digital analog converter.
Optionally, the modulus digital analog converter uses AK4612 chip, and the digital audio processor uses
ADAU1452 chip.
Optionally, the audio output module includes eight audio output circuits, and the audio output circuit is used for institute
It is exported after stating the amplification of the second analog signal.
Optionally, the audio processing modules further include cascade multiple second filter units, second filter unit
For being filtered to signal of first digital signal after first filtering unit filters to form second number
Word signal；There are many filter patterns for each second filter unit.
The present invention is by using including Audio Input Modules, modulus digital analog converter, audio processing modules and audio output
The audio signal of input is enlarged into the first analog signal by the audio frequency processing circuit of module, Audio Input Modules, and modulus digital-to-analogue turns
First analog signal is converted to the first digital signal by parallel operation, and cascade first filter unit configured in audio processing modules will
First digital signal generates the second digital signal after being filtered, and the second digital signal is converted to by modulus digital analog converter
Two analog signals, audio output module will the second analog signal amplification after export, due to configured in audio processing modules first
Filter unit has a variety of filter patterns, can be realized the filtering more fine to the first digital signal, meets more applications
Scene expands the use scope of audio frequency processing circuit.
Detailed description of the invention
Fig. 1 is a kind of electrical block diagram of audio frequency processing circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of first filter unit provided in an embodiment of the present invention；
Fig. 3 is the electrical block diagram of another audio frequency processing circuit provided in an embodiment of the present invention；
Fig. 4 is the electrical block diagram of another audio frequency processing circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of electrical block diagram of Audio Input Modules provided in an embodiment of the present invention；
Fig. 6 is a kind of electrical block diagram of modulus digital analog converter provided in an embodiment of the present invention；
Fig. 7 is a kind of electrical block diagram of digital audio processor provided in an embodiment of the present invention；
Fig. 8 is a kind of electrical block diagram of controller provided in an embodiment of the present invention；
Fig. 9 is a kind of electrical block diagram of USB module provided in an embodiment of the present invention；
Figure 10 is the electrical block diagram of a kind of crystal oscillating circuit and reset circuit provided in an embodiment of the present invention；
Figure 11 is a kind of electrical block diagram of echo processor and reverberation processor provided in an embodiment of the present invention；
Figure 12 is a kind of electrical block diagram of audio output module provided in an embodiment of the present invention；
Figure 13 is a kind of electrical block diagram of power amplification circuit provided in an embodiment of the present invention；
Figure 14 is a kind of electrical block diagram of second filter unit provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of electrical block diagram of audio frequency processing circuit provided in an embodiment of the present invention, and Fig. 2 is that the present invention is real
The structural schematic diagram of the first filter unit of one kind of example offer is applied, with reference to Fig. 1 and Fig. 2, audio frequency processing circuit includes audio input
Module 11, modulus digital analog converter 12, audio processing modules 13 and audio output module 14；Audio Input Modules 11 include first
Analog signal output A1, Audio Input Modules 11 are used for input audio signal；Modulus digital analog converter 12 includes the first simulation
Signal input part A2, the first digital signal output end B1, the second digital signal input end C2 and the second analog signal output D1,
Modulus digital analog converter 12 is used to the first analog signal inputted by Audio Input Modules 11 being converted into the first digital signal, and
The second digital signal inputted by audio processing modules 13 is converted into the second analog signal；Audio processing modules 13 include first
Digital signal input end B2 and the second digital signal output end C1, audio processing modules 13 are configured with cascade multiple first filtering
It is single, 131, each first filter unit 131 all has a variety of filter patterns；First filter unit 131 is used to believe the first number
It number is filtered to form the second digital signal.
Specifically, audio signal is inputted by Audio Input Modules 11, and first is generated after the amplification of Audio Input Modules 11
Analog signal, and the first analog signal is sent to modulus digital analog converter 12；Modulus digital analog converter 12 is to the first analog signal
Analog-to-digital conversion is carried out, to be converted into the first digital signal, and the first digital signal is sent to audio processing modules 13；Audio processing
13 cascade first filter unit 131 in inside of module is filtered the first digital signal, to form the second digital signal, and will
Second digital signal is sent to modulus digital analog converter 12, can be right since there are many filter patterns for the configuration of the first filter unit 131
First digital signal carries out more fine and more various adjusting, and the second digital signal obtained accordingly also has difference
As a result, it is possible to meet the needs of plurality of application scenes；Modulus digital analog converter 12 carries out digital-to-analogue conversion to the second digital signal,
To be converted into the second analog signal and export to audio output module 14, audio output module 14 puts the second analog signal
Output after big；To make audio frequency processing circuit realization the audio signal of input is exported after being filtered, meet it is more harsh with
And more application scenarios.
The technical solution of the present embodiment, by using including Audio Input Modules, modulus digital analog converter, audio processing mould
The audio frequency processing circuit of block and audio output module, the audio signal of input is enlarged into the first simulation by Audio Input Modules to be believed
Number, the first analog signal is converted to the first digital signal by modulus digital analog converter, is configured in audio processing modules cascade
First digital signal is generated the second digital signal by the first filter unit after being filtered, and modulus digital analog converter is counted second
Word signal is converted to the second analog signal, and audio output module exports after amplifying the second analog signal, due to audio processing mould
The first filter unit configured in block has a variety of filter patterns, can be realized the filtering more fine to the first digital signal,
Meet more harsh and more application scenarios, expands the use scope of audio frequency processing circuit.
Optionally, each first filter unit can be configured to parametric equalization filter, high-pass filter, low-pass filtering
Device or lower frame filter.
Illustratively, 15 the first filter units can be cascaded, 15 center frequencies are set in 20Hz to 20KHz frequency range
Rate point, each first filter unit correspond to a center frequency points, i.e., each first filter unit is to corresponding centre frequency
The parameter of point is adjusted, such as adjustment Q value or gain；If Audio Input Modules 11 can acquire the sound of surrounding, such as voice,
General collected voice can have more noise, such as ambient noise, by adjusting the mode of the first filter unit 131
To remove noise；It, can also be by adjusting one or more first when being such as used for bright reading mode simultaneously for different application scenarios
The filter patterns of filter unit, the missing of Lai Gaishan voice increase the emotion read aloud, and enhance the usage experience of user.
Optionally, Fig. 3 is the electrical block diagram of another audio frequency processing circuit provided in an embodiment of the present invention, reference
Fig. 3, audio processing modules 13 include digital audio processor 132 and controller 133；The number letter of digital audio processor 132
Number input terminal B3 is electrically connected with the first digital signal input end B2, the digital signal output end C3 of digital audio processor 132 with
Second digital signal output end C1 electrical connection, the control terminal of digital audio processor 132 are electrically connected with controller 133；Digital sound
Frequency processor 132 is used for the first filtering being set in digital audio processor 132 according to the adjustment of the control signal of controller 133
The filter patterns of unit.
Specifically, controller 133 outputs control signals to digital audio processor 132,132 basis of digital audio processor
The filter patterns that signal adjusts the first filter unit are controlled, such as adjusting the first filter unit is high-pass filter, to filter out low
The noise of frequency；Controller 133 can be communicated with host computer, and human-computer interaction interface is formed on host computer, so that user is more
Intuitively the first filter unit in digital audio processor 132 is configured, promotes user experience.
Optionally, Fig. 4 is the electrical block diagram of another audio frequency processing circuit provided in an embodiment of the present invention, reference
Fig. 4 further includes echo processor 134, and echo processor 134 is electrically connected with digital audio processor 132, echo processor 134
For mono echo, stereo echo or left and right echo will to be adjusted to from the received audio signal of digital audio processor 132
And it exports to digital audio processor 132 to form the second digital signal.
Specifically, digital audio processor 132 is to the first digital signal for there is the application scenarios of echo processing demand
It, can also be according to the control signal of controller 132 will treated that audio signal is delivered to echo processor after being filtered
134；Echo processor 134 adjusts the echo mode of input signal, then again send the signal after adjustment echo mode to number
Audio processor 132, to form the second digital signal in digital audio processor 132；To through modulus digital analog converter 12
And the audio signal Echo after audio output module output is met the needs of users, further expansion audio processing electricity
The use scope on road.
It optionally, further include reverberation processor 135, reverberation processor 135 and digital audio processor with continued reference to Fig. 4
132 electrical connections, reverberation processor 135 are used to adjust the reverberation effect from the received audio signal of digital audio processor 132.
Specifically, digital audio processor 132 is to the first digital signal for there is the application scenarios of reverberation process demand
It, can also be according to the control signal of controller 132 will treated that audio signal is delivered to reverberation processor after being filtered
135；Reverberation processor 135 adjusts the reverberation pattern of input signal, then again send the signal after adjustment reverberation pattern to number
Audio processor 132, to form the second digital signal in digital audio processor 132；To through modulus digital analog converter 12
And the audio signal reverberation effect after audio output module output is met the needs of users, further expansion audio processing electricity
The use scope on road.
It optionally, further include optical fiber input module 136, the output end and number of optical fiber input module 136 with continued reference to Fig. 4
The fiber-optic signal input terminal of word audio processor 132 is electrically connected, and optical fiber input module 136 is for exporting fiber-optic signal to number
Audio processor.
Specifically, optical fiber input module 136 can directly send audio signal (fiber-optic signal) to digital audio processor 132
It is interior, since the audio signal of numeric type can be directly inputted, the analog-to-digital conversion through modulus digital analog converter 12 is not needed, thus greatly
The signal-to-noise ratio of audio signal is improved greatly, so that the audio signal quality of audio frequency processing circuit output is higher.
Optionally, Fig. 5 is a kind of electrical block diagram of Audio Input Modules provided in an embodiment of the present invention, with reference to figure
5, Audio Input Modules include the first microphone input module 110, the second microphone input module 111, first music input module 112
With the second music input module 113；The output end of first microphone input module 110 and the second microphone input module 111 is and mould
Number digital analog converter 12 is electrically connected, and the first microphone input module 110 and the second microphone input module 111 are for defeated by microphone signal
Enter to modulus digital analog converter 12；The output end of first music input module 112 and the second music input module 113 is and modulus
Digital analog converter 12 is electrically connected, and first music input module 112 and the second music input module 113 are for inputting music signal
To modulus digital analog converter 12.
Specifically, the first microphone input module 110 may include that such as capacitor, resistance and operational amplifier form with reference to Fig. 5
Multistage amplifier circuit, thus to input the first microphone input module 110 signal amplify so that the power of output signal
It can match with modulus digital analog converter；Second microphone input module 111 may include such as capacitor, resistance and operational amplifier
The multistage amplifier circuit of composition, so that the signal of the second microphone input module 111 of input is amplified, so that output signal
Power can match with modulus digital analog converter；First music input module 112 may include that such as capacitor, resistance and operation are put
The multistage amplifier circuit of big device composition, to be amplified to the signal of input first music input module 112, so that output is believed
Number power can match with modulus digital analog converter；Second music input module 113 may include such as capacitor, resistance and fortune
The multistage amplifier circuit of amplifier composition is calculated, to amplify to the signal of the second music input module 110 of input, so that defeated
The power of signal can match with modulus digital analog converter out.
Optionally, Fig. 6 is a kind of electrical block diagram of modulus digital analog converter provided in an embodiment of the present invention, Fig. 7
For a kind of electrical block diagram of digital audio processor provided in an embodiment of the present invention, with reference to Fig. 5 to Fig. 7, modulus digital-to-analogue
Converter uses AK4612 chip, the electrical connection corresponding with the port on Audio Input Modules of the port of modulus digital analog converter, mould
Number digital analog converter includes the DAC of 6 road ADC (Analog-to-Digital Converter, digital analog converter) and 8 tunnels
(Digital-to-Analog Converter, digital analog converter) can satisfy (the first microphone input of 4 road Audio Input Modules
Module, the second microphone input module, first music input module and the second music input module) output audio signal modulus
Conversion function；Digital audio processor uses ADAU1452 chip, the port of digital audio processor and modulus digital analog converter
On the corresponding electrical connection in port, cascade multiple first filter units are configured with inside digital audio processor, to input
Audio signal is filtered and then generates the second digital signal, so that modulus digital analog converter and audio output module are defeated
Out.
It should be noted that including the audio input circuit of multiple input modules for Audio Input Modules, such as comprising the
The audio input of one microphone input module, the second microphone input module, first music input module and the second music input module
Circuit, each input module can correspond to one group of cascade first filter unit, thus when multiple input modules have input,
It still can satisfy the demand to audio signal filtering.
Optionally, Fig. 8 is a kind of electrical block diagram of controller provided in an embodiment of the present invention, with reference to Fig. 5 to figure
8, STC15F2K can be used in controller, the port on controller it is corresponding with the port on digital audio processor electrical connection, with to
Digital audio processor provides control signal, to adjust the first filter unit in digital audio processor according to the demand of user
Filter patterns.
Optionally, Fig. 9 is a kind of electrical block diagram of USB module provided in an embodiment of the present invention, with reference to Fig. 8 and figure
9, the port electrical connection corresponding with the port on controller in USB module, so that controller can pass through USB port and other
Device (such as host computer) is communicated, and then human-computer interaction interface is formed on host computer, so that user is more intuitively
The first filter unit in digital audio processor is configured, user experience is promoted.
Optionally, Figure 10 is the circuit structure signal of a kind of crystal oscillating circuit and reset circuit provided in an embodiment of the present invention
Figure, with reference to Fig. 8 and Figure 10, port on crystal oscillating circuit 201 and reset circuit 202 is corresponding with the port on controller to be electrically connected
It connects, to provide crystal oscillation signal and reset signal for controller.
Optionally, Figure 11 is that the circuit structure of a kind of echo processor and reverberation processor provided in an embodiment of the present invention shows
It is intended to, with reference to Figure 11, reverberation processor and echo processor may each comprise BD3201 chip, may be configured in BD3201 chip
Cascade multistage digital filter, every section of digital filter may be configured as parametric equalization filter, high-pass filter, low pass filtered
Echo can be adjusted to stereo echo, monophonic by wave device, overhead filter or lower frame filter, echo processor 134
Echo or left and right echo, to imitate actual scene；Reverberation processor 135 reverberation effect can be adjusted to Rooms,
Halls, Reverses etc., to imitate actual scene.
Optionally, Figure 12 is a kind of electrical block diagram of audio output module provided in an embodiment of the present invention, reference
Figure 12, audio output module include eight audio output circuits (Figure 12 illustratively shows two audio output circuits), sound
Frequency output circuit is used to export after the amplification of the second analog signal.Figure 13 is a kind of power amplification electricity provided in an embodiment of the present invention
The electrical block diagram on road, with reference to Figure 12 and Figure 13, audio output circuit may include such as resistance, capacitor and operational amplifier group
At amplifying circuit, port electricity corresponding with the port on modulus digital analog converter and power amplification circuit on audio output circuit
Connection, power amplification circuit can be used for exporting to playback equipment the signal that audio output circuit exports after power amplification, with
Audio signal is played.
Optionally, Figure 14 is a kind of electrical block diagram of second filter unit provided in an embodiment of the present invention, reference
Figure 14, audio processing modules further include cascade multiple second filter units 301, and the second filter unit 301 is used for the first number
Signal of the word signal after the first filtering unit filters is filtered to form the second digital signal；Each second filter unit
301 all have a variety of filter patterns.
Specifically, each second filter unit can be configured to parametric equalization filter, high-pass filter, low-pass filter
Or lower frame filter；One group of cascade second filter unit may include 10 the second filter units, and the second filter unit can be number
Digital filter inside word audio processor；Digital audio processor to modulus digital analog converter export the second digital signal it
Before, it first passes through one group of cascade second filter unit and is filtered, music, microphone, echo, reverberation and other effects are transferred to most preferably
Position so that the output signal of audio frequency processing circuit meets more harsh application scenarios.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of audio frequency processing circuit, which is characterized in that the audio frequency processing circuit includes: Audio Input Modules, modulus digital-to-analogue
Converter, audio processing modules and audio output module；
The Audio Input Modules include the first analog signal output, and the Audio Input Modules are used for input audio signal；
The modulus digital analog converter includes the first input end of analog signal, the first digital signal output end, the second digital signal
Input terminal and the second analog signal output, institute's modulus digital analog converter be used for will be inputted by the Audio Input Modules first
Analog signal is converted into the first digital signal, and the second digital signal inputted by the audio processing modules is converted into second
Analog signal；
The audio processing modules include the first digital signal input end and the second digital signal output end, the audio processing mould
Block is configured with cascade multiple first filter units, and there are many filter patterns for each first filter unit；Described first
Filter unit is for being filtered first digital signal to form second digital signal；
The audio output module includes the second input end of analog signal, and the audio output module is for exporting second mould
Quasi- signal.
2. audio frequency processing circuit according to claim 1, which is characterized in that each first filter unit can be matched
It is set to parametric equalization filter, high-pass filter, low-pass filter, overhead filter or lower frame filter.
3. audio frequency processing circuit according to claim 1, which is characterized in that the audio processing modules include digital audio
Processor and controller；
The digital signal input end of the digital audio processor is electrically connected with first digital signal input end, the number
The digital signal output end of audio processor is electrically connected with second digital signal output end, the digital audio processor
Control terminal is electrically connected with the controller；
The digital audio processor is used to be set to the digital audio processing according to the adjustment of the control signal of the controller
The filter patterns of first filter unit in device.
4. audio frequency processing circuit according to claim 3, which is characterized in that further include echo processor, at the echo
Reason device is electrically connected with the digital audio processor, and the echo processor is used for will be received from the digital audio processor
Audio signal is adjusted to mono echo, stereo echo or left and right echo and exports to the digital audio processor to be formed
Second digital signal.
5. audio frequency processing circuit according to claim 3, which is characterized in that further include reverberation processor, at the reverberation
Reason device is electrically connected with the digital audio processor, and the reverberation processor is received for adjusting from the digital audio processor
Audio signal reverberation effect.
6. audio frequency processing circuit according to claim 3, which is characterized in that further include optical fiber input module, the optical fiber
The output end of input module is electrically connected with the fiber-optic signal input terminal of the digital audio processor, and the optical fiber input module is used
It exports in by fiber-optic signal to the digital audio processor.
7. audio frequency processing circuit according to claim 1, which is characterized in that the Audio Input Modules include the first microphone
Input module, the second microphone input module, first music input module and the second music input module；
The output end of the first microphone input module and the second microphone input module with the modulus digital analog converter
Electrical connection, the first microphone input module and the second microphone input module are used to microphone signal being input to the modulus
Digital analog converter；
The output end of the first music input module and the second music input module with the modulus digital analog converter
Electrical connection, the first music input module and the second music input module are used to music signal being input to the modulus
Digital analog converter.
8. audio frequency processing circuit according to claim 3, which is characterized in that the modulus digital analog converter uses AK4612
Chip, the digital audio processor use ADAU1452 chip.
9. audio frequency processing circuit according to claim 1, which is characterized in that the audio output module includes eight audios
Output circuit, the audio output circuit are used to export after second analog signal amplification.
10. audio frequency processing circuit according to claim 9, which is characterized in that the audio processing modules further include cascade
Multiple second filter units, second filter unit is for filtering first digital signal through first filter unit
Signal after wave is filtered to form second digital signal；There are many filter mould for each second filter unit
Formula.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114389732A (en) * | 2022-03-08 | 2022-04-22 | 深圳德威音响有限公司 | Digital sound console tuning system and method |
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