CN208891057U - Apparatus for processing audio, chip and system - Google Patents
Apparatus for processing audio, chip and system Download PDFInfo
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- CN208891057U CN208891057U CN201821822293.1U CN201821822293U CN208891057U CN 208891057 U CN208891057 U CN 208891057U CN 201821822293 U CN201821822293 U CN 201821822293U CN 208891057 U CN208891057 U CN 208891057U
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Abstract
The utility model relates to a kind of apparatus for processing audio, chip and system, which includes biasing and differential conversion module, filtering adjustment module and differential amplification module；By biasing and differential conversion module according to bias supply etc. to the ambient noise signal of sound pick up equipment, generate symmetrical common mode noise signal, and the Frequency Response by improving filtering adjustment module, make it possible to reach improvement filtering adjustment module to the filter effect of audio signal with the smaller capacitor of capacitance, the characteristics of inhibiting common-mode signal using differential amplification module amplification difference mode signal, inhibit common mode noise signal, improves the quality of the audio signal of sound pick up equipment output.
Description
Technical field
The utility model relates to audio signal processing technique fields, more particularly to apparatus for processing audio, chip and system.
Background technique
Fig. 1 is the structural schematic diagram of the audio frequency processing circuit of traditional technology, and traditional audio frequency processing circuit often uses list
Hold amplifying circuit 10, and by between microphone MIC and single-ended amplifying circuit 10 serial coupling capacitor C0 with improve audio letter
Number quality, wherein analog-to-digital conversion module ADC is for acquiring by 10 treated audio signal of single-ended amplifying circuit processing.So
And single-ended amplifying circuit 10 is poor to the rejection ability of common-mode noise, the biggish coupled capacitor C0 of the capacitance that need to connect is to improve to audio
The low frequency Frequency Response of signal, but coupled capacitor C0 capacitance is bigger, and volume is bigger, and the cost of audio frequency processing circuit is bigger.Due to
The larger reason of volume, biasing resistor Ra and coupled capacitor C0 in the audio frequency processing circuit of traditional technology are difficult to integrate in audio
It handles inside chip 20.According to the coupled capacitor C0 compared with low-capacitance, then the effect of good Frequency Response is not achieved.
Utility model content
Based on this, it is necessary to which the technical problem for inhibiting noise difference for audio frequency processing circuit provides apparatus for processing audio, core
Piece and system.
In a first aspect, the utility model embodiment provides a kind of apparatus for processing audio, including biasing and differential conversion module,
Filter adjustment module and differential amplification module；Wherein, filtering adjustment module includes equal the of impedance amplifying unit, capacitance
One capacitor cell and the second capacitor cell；
Biasing is used to connect the first end of sound pick up equipment and first capacitor unit with the first end of differential conversion module, to connect
The first audio signal of mixer output is tidied up, and exports the first audio signal and the first noise signal to first capacitor unit；
Biasing connect the first end of the second capacitor cell with the second end of differential conversion module, for exporting second to the second capacitor cell
Noise signal；Wherein, the first noise signal and the second noise signal are the first common mode noise signal；
The first capacitor unit be used for the first input end of the differential amplification module export the second audio signal and
Third noise signal, second capacitor cell export the 4th noise signal to the second input terminal of the differential amplification module,
Wherein, the third noise signal and the 4th noise signal are the second common mode noise signal；
The second end of the first end connection first capacitor unit of impedance amplifying unit, the second end connection of impedance amplifying unit
The second end of second capacitor cell, for amplifying between the second end of first capacitor unit and the second end of the second capacitor cell
Impedance；
The first end of the first input end connection impedance amplifying unit of differential amplification module, the second of differential amplification module are defeated
Entering the second end of end connection impedance amplifying unit, differential amplification module is used to inhibit third noise signal and the 4th noise signal,
And export third audio signal.
Impedance amplifying unit includes that the first impedance adjustment unit and the second impedance adjust list in one of the embodiments,
Member；
The second end of the first end connection first capacitor unit of first impedance adjustment unit, the of the first impedance adjustment unit
Two ends connect the second end of the second impedance adjustment unit, and the first end of the second impedance adjustment unit connects the of the second capacitor cell
Two ends；
First impedance adjustment unit is used to adjust the second end and the second of the second impedance adjustment unit of first capacitor unit
Impedance between end；
Second impedance adjustment unit is used to adjust the second end and the second of the first impedance adjustment unit of the second capacitor cell
Impedance between end.
The first impedance adjustment unit includes first switch subelement and first resistor unit in one of the embodiments,
Second impedance adjustment unit includes second switch subelement and second resistance unit；
The second end of the first end connection first capacitor unit of first resistor unit, the second end connection of first resistor unit
The first end of first switch subelement, the second end of the second end connection second switch subelement of first switch subelement, second
The second end of the first end connection second resistance unit of subelement is switched, the first end of second resistance unit connects the second capacitor list
The second end of member.
The first impedance adjustment unit further includes third switch subelement in one of the embodiments, and third switch is single
The first end of the first end connection first resistor unit of member, third switch the second end connection second switch subelement of subelement
Second end；
Second impedance adjustment unit further includes and the 4th switch subelement, the first end of the 4th switch subelement connect second
The first end of resistance unit, the second end of the second end connection second switch subelement of the 4th switch subelement.
In one of the embodiments, biasing with differential conversion module include 3rd resistor unit, the 4th resistance unit and
5th resistance unit；
The first end of 3rd resistor unit is for connecting bias supply, and the second end of 3rd resistor unit is for connecting pickup
Transposition, wherein the second end of 3rd resistor unit is the first end of biasing with differential conversion module；
The first end of 4th resistance unit connects the 5th resistance for connecting bias supply, the second end of the 4th resistance unit
The first end of unit, the second end ground connection of the 5th resistance unit, wherein the second end of the 4th resistance unit is that biasing turns with difference
Change the mold the second end of block.
It in one of the embodiments, further include gain regulation module；
Gain regulation module connects the first output end and second output terminal of differential amplification module, for adjusting differential amplification
The gain factor of module.
It in one of the embodiments, further include low-pass filtering module；
First output end of differential amplification module connects the second output terminal of differential amplification module by low-pass filtering module.
It in one of the embodiments, further include the first analog-to-digital conversion module；
The first end of first input end the connection biasing and differential conversion module of first analog-to-digital conversion module, for acquiring partially
Set the voltage-to-ground value with the first end of differential conversion module；
The second end of the second input terminal the connection biasing and differential conversion module of first analog-to-digital conversion module, for acquiring partially
Set the voltage-to-ground value with the second end of differential conversion module.
It in one of the embodiments, further include the second analog-to-digital conversion module；
First output end of the first input end connection differential amplification module of the second analog-to-digital conversion module, for acquiring difference
The voltage value of first output end of amplification module；
The second output terminal of the second input terminal connection differential amplification module of second analog-to-digital conversion module, for acquiring difference
The voltage value of the second output terminal of amplification module.
Second aspect, the utility model embodiment provide a kind of audio processing chip, at the audio including such as first aspect
Manage device.
The third aspect, the utility model embodiment provide a kind of audio processing system, at the audio including such as second aspect
Manage chip and sound pick up equipment；
The first end of sound pick up equipment connection biasing and differential conversion module, sound pick up equipment are used for biasing and differential conversion mould
Block exports the first audio signal.
Utility model apparatus for processing audio provided by the above embodiment, chip and system pass through biasing and differential conversion mould
Root tuber, to the ambient noise signal of sound pick up equipment, generates symmetrical common mode noise signal according to bias supply etc., and by changing
The Frequency Response of kind filtering adjustment module, makes it possible to reach improvement filtering adjustment module to audio with the smaller capacitor of capacitance
The filter effect of signal amplifies the characteristics of difference mode signal inhibits common-mode signal using differential amplification module, inhibits common-mode noise letter
Number, improve the quality of the audio signal of sound pick up equipment output, and then realize and apparatus for processing audio is integrated in chip interior.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the audio frequency processing circuit of traditional technology；
Fig. 2 is a kind of first structure diagram of apparatus for processing audio provided by the embodiment of the utility model；
Fig. 3 is a kind of circuit diagram of apparatus for processing audio provided by the embodiment of the utility model；
Fig. 4 is a kind of the second structural schematic diagram of apparatus for processing audio provided by the embodiment of the utility model.
Specific embodiment
The utility model will be described more fully below for the ease of understanding the utility model,.But this is practical
It is novel to realize in many different forms, however it is not limited to embodiment described herein.On the contrary, providing these implementations
The purpose of example is to make the understanding of the disclosure of the utility model more thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.
Fig. 2 is a kind of first structure diagram of apparatus for processing audio provided by the embodiment of the utility model, such as Fig. 1 institute
Show, which includes biasing and differential conversion module 110, filtering adjustment module 120 and differential amplification module
130；Wherein, the filtering adjustment module 120 first capacitor unit 121 and second equal including impedance amplifying unit 123, capacitance
Capacitor cell 122.
Biasing and the first end of differential conversion module 110 are used to connect the of sound pick up equipment 140 and first capacitor unit 121
One end to receive the first audio signal of the output of sound pick up equipment 140, and exports the first audio signal to first capacitor unit 121
With the first noise signal；Biasing connect the first end of the second capacitor cell 122 with the second end of differential conversion module 110, is used for
The second noise signal is exported to the second capacitor cell 122；Wherein, the first noise signal and the second noise signal are common-mode noise letter
Number；
The second end of the first end connection first capacitor unit 121 of impedance amplifying unit 123, impedance amplifying unit 123
Second end connects the second end of the second capacitor cell 122, for amplifying the second end and the second capacitor list of first capacitor unit 121
Impedance between the second end of member 122；The first of the first input end connection impedance amplifying unit 123 of differential amplification module 130
End, the second end of the second input terminal connection impedance amplifying unit 123 of differential amplification module 130, differential amplification module 130 are used for
Inhibit third noise signal and the 4th noise signal, and exports the second audio signal.
Specifically, sound pick up equipment 140 is the equipment of output audio signal, such as microphone, speaker, voice changer.First sound
Frequency signal is the audio signal that sound pick up equipment 140 exports.Biasing connect bias supply Vbias with differential conversion module 110, passes through
It adjusts biasing and makes sound pick up equipment 140 work in normal operating conditions with differential conversion module 110, optionally, sound pick up equipment 140
Best operating point is worked in, differential amplification module is in quiescent point, and prevent circuit from generating non-linear distortion, and make audio
Signal noise is minimum, has preferable amplification effect.
The first end of biasing and differential conversion module 110 is the output end of sound pick up equipment 140.When sound pick up equipment 140 works,
Noise signal caused by the environment such as bias supply Vbias can interfere the audio signal noise of output.Biasing and differential conversion
The first voltage signal for the first noise signal that the first end of module generates is Va1.In order to symmetrically inhibit the first noise to believe
Number, apply second voltage signal Vb1 in biasing and the second end of differential conversion module 110, i.e. the second noise signal, first end
The difference of voltage value Va1 and the voltage value Vb1 of second end are in preset threshold range, to form it into common-mode signal.Wherein, partially
Setting with the second end of differential conversion module 110 is to result from the connecting pin of the identical voltage magnitude of first end, the first noise signal and
Second noise signal is the first common mode noise signal.Preferably, the voltage value of first end is equal to the voltage value of second end, i.e. Va1
=Vb1, in order to which the noise signal to sound pick up equipment 140 is effectively inhibited.It should be noted that should be in apparatus for processing audio
When not having input audio signal, the voltage value Vb1 for adjusting second end makes the difference of the voltage value Va1 of itself and first end be in default threshold
It is worth in range.
Filtering adjustment module 120 is the module with filter function, and filtering adjustment module 120 includes high-pass filter, low
One or more filters such as bandpass filter, bandpass filter and bandstop filter, by elements such as a variety of capacitors and resistance units
Composition is connected by the modes such as in parallel or series.Optionally, the capacitance or electricity of capacitor in adjustment module 120 are filtered by changing
The impedance of resistance can improve each filter response in filtering adjustment module.In embodiment, biasing and differential conversion module
First audio signal of 110 first ends output exports after filtering adjustment module 120 is filtered to differential amplification module
130 first input end.
Specifically, the filtering adjustment module 120 in embodiment includes the first RC filter symmetrically connected and the 2nd RC filter
Wave device.First RC filter includes impedance amplifying unit 123 and first capacitor unit 121, and the 2nd RC filter includes that impedance is put
Big unit 123 and the second capacitor cell 122.First RC filter is used to filter out the first end of biasing Yu differential conversion module 110
The audio signal of output.Since the first RC filter itself can bring noise, in order to symmetrically inhibit the first RC filter bring
Noise connect the 2nd RC filter with the second end of differential conversion module 110 in biasing to generate identical noise in embodiment
Signal, to form common-mode signal.Preferably, pair of the first RC filter and the 2nd RC filter in adjustment module 120 is filtered
Title property is better, and differential amplification module is stronger to the rejection ability of common-mode signal.
The impedance for amplifying impedance amplifying unit 123, the frequency response that can improve the first RC filter and the 2nd RC filter are special
Property.It, can be by the impedance of amplification impedance amplifying unit 123, so that meeting makes under identical Frequency Response in embodiment
Under the premise of with the first capacitor unit 121 and the second capacitor cell 122 compared with low-capacitance, identical Frequency Response is obtained.Due to
The capacitance of first capacitor unit 121 and the second capacitor cell 122 becomes smaller, and volume is also smaller, can be by first capacitor unit 121
It is integrated in inside audio processing chip with the second capacitor cell 122, optimizes the function of audio processing chip, while reducing cost.
Apparatus for processing audio in embodiment is handled audio signal and its noise signal using differential amplification module,
Differential amplification module carry out signal processing have the characteristics that it is symmetrical, i.e., first capacitor unit and the second capacitor cell be capacitance phase
Deng capacitor cell.First capacitor unit and the second capacitor cell may include one or more capacity cells.Since impedance is amplified
Unit amplifies the input impedance of differential amplification module, so capacitor can be used in first capacitor unit and the second capacitor cell
It is worth lesser unit to realize filtering processing, optionally, capacitance 5p-100p.First capacitor unit 121 believes the first audio
Number and the first noise signal be filtered, export the second audio signal and third noise signal, the second capacitor cell 122 is to second
Noise signal is filtered, and exports the 4th noise signal, third noise signal and the 4th noise signal as the second common-mode noise letter
Number；Wherein, the second audio signal is the audio signal that the first audio signal passes through that first capacitor unit 121 is filtered.
First capacitor unit 121 and the second capacitor cell 122 are the equal capacitor cells of capacitance, therefore in embodiment, first capacitor list
Member is 121 identical with the filter capacity of the second capacitor cell 122, and the third noise signal of output and the 4th noise signal are the
Two common mode noise signals；Wherein, third noise signal includes the first noise signal after being filtered；4th noise signal packet
Include the second noise signal after being filtered.
Specifically, symmetry and negative feedback of the differential amplification module 130 using circuit parameter, effectively stable static state
Operating point, amplification difference mode signal inhibit common-mode signal.In embodiment, differential amplification module 130 is to third noise signal and
Four noise signals carry out inhibition processing, so that the effect of inhibition is cancelled out each other and realized to third noise signal and the 4th noise signal
Fruit.In order to which the audio signal exported to sound pick up equipment 140 is removed noise processed, point of sound pick up equipment is adjusted in embodiment
Pressure, so that the work of differential amplification module 130 is exported in quiescent point, and by the audio signal that sound pick up equipment exports to difference
The first input end of amplification module 130.Differential amplification module 130 includes operational amplifier OP1 and operational amplifier OP2.
It should be noted that differential amplification module 130 includes first input end, the first output end, the second input terminal and the
Two output ends.Wherein, first input end includes the first non-inverting input terminal and the first reverse input end, and the second input terminal includes second
Non-inverting input terminal and the second reverse input end.In the present embodiment, the first end of impedance amplifying unit 123 connects differential amplification module
130 the first non-inverting input terminal, the second homophase input of the second end connection differential amplification module 130 of impedance amplifying unit 123
End.
The course of work of apparatus for processing audio provided in this embodiment can be with are as follows: the audio signal that sound pick up equipment 140 exports
The first input end exported with the first end of differential conversion module 110 to filtering adjustment module 120 is biased to be filtered
Afterwards, it exports via the first output end of filtering adjustment module 120 to the first non-inverting input terminal of differential amplification module 130, then by
First output end of differential amplification module 130 exports.The second end of biasing and differential conversion module 110 generates and first end, i.e.,
The symmetrical noise signal of the output end of sound pick up equipment 140, to form common mode noise signal, and then by the defeated of sound pick up equipment 140
The noise signal of outlet carries out counteracting inhibition through differential amplification module 130, to achieve the effect that improve audio signal.Due to inclined
It sets and does not connect sound pick up equipment 140 with the second end of differential conversion module 110, there is no the transmission of audio signal, so difference
The difference of voltage signal between the first non-inverting input terminal and the second non-inverting input terminal of amplification module, i.e. difference mode signal are audio
Signal amplifies the characteristics of difference mode signal inhibits common-mode signal using differential amplification module 130, realizes the sound exported to sound pick up equipment
The improvement of frequency signal quality inhibits noise signal.
Apparatus for processing audio provided in this embodiment is made an uproar with differential conversion module according to environment such as bias supplies by biasing
Acoustical signal exports the first noise signal and the second noise signal, wherein the first noise signal and the second noise signal are common-mode noise
Signal is adjusted the Frequency Response that the adjustment filtering of impedance amplifying unit adjusts mould, improves filter effect, put using differential amplification module
The characteristics of big difference mode signal inhibits common-mode signal, amplifies audio signal, and inhibition biases first exported with differential conversion module and makes an uproar
Acoustical signal and the second noise signal make it possible to reach the noise processed for improving apparatus for processing audio with the smaller capacitor of capacitance
Effect inhibits noise signal, improves the quality of audio signal.
Impedance amplifying unit 123 includes that the first impedance adjustment unit and the second impedance are adjusted in one of the embodiments,
Unit；The second end of the first end connection first capacitor unit of first impedance adjustment unit, the second of the first impedance adjustment unit
The second end of the second impedance adjustment unit of end connection, the first end of the second impedance adjustment unit connect the second of the second capacitor cell
End；First impedance adjustment unit is for adjusting between the second end of first capacitor unit and the second end of the second impedance adjustment unit
Impedance；Second impedance adjustment unit is for adjusting the second end of the second capacitor cell and the second end of the first impedance adjustment unit
Between impedance.
Specifically, changing the equivalent resistance of the first impedance adjustment unit, to adjust the output end and the of first capacitor unit
Impedance between the second end of two impedance adjustment units changes the equivalent resistance of the second impedance adjustment unit, to adjust the second electricity
Hold the impedance between the output end of unit and the second end of the first impedance adjustment unit.In embodiment, first capacitor unit it is defeated
Outlet is the first input end of differential amplification module, and the output end of the second capacitor cell is the second input of differential amplification module
End changes the equivalent resistance of the first impedance adjustment unit and the second impedance adjustment unit, to change the input of differential amplification module
Impedance.
The first impedance adjustment unit includes first switch subelement and first resistor unit in one of the embodiments,
Second impedance adjustment unit includes second switch subelement and second resistance unit；The first end connection first of first resistor unit
The second end of capacitor cell, the first end of the second end connection first switch subelement of first resistor unit, first switch are single
The second end of the second end connection second switch subelement of member, the first end connection second resistance unit of second switch subelement
Second end, the first end of second resistance unit connect the second end of the second capacitor cell.
Wherein, first switch subelement and second switch subelement are at least two state of a controls such as opening or closing
Electronic component, with circuit pathways, such as switch, relay where being switched on or switched off etc..First switch subelement and second is opened
Climax unit may include one or more electronic components with opening and closing function.First switch in one of the embodiments,
Unit and second switch subelement are switch.
It, can be with by the opening and closing frequency and duty ratio of control first switch subelement and second switch subelement in embodiment
It adjusts between the first input end of differential amplification module and the second end of the second impedance adjustment unit and differential amplification module
Impedance between second input terminal and the second end of the first impedance adjustment unit.Fig. 3 is provided by the embodiment of the utility model one
The circuit diagram of kind apparatus for processing audio, as shown in figure 3, in embodiment, first switch subelement is switch K1, second opens
Climax unit is switch K2, first resistor unit is resistance R1 and second resistance unit is resistance R2.In the present embodiment, such as Fig. 3
Shown, first capacitor unit is capacitor C1, and the second capacitor cell is capacitor C2.Since impedance amplifying unit is to differential amplification module
Input impedance amplify, so the lesser unit of capacitance can be used to realize for first capacitor unit and the second capacitor cell
Filtering processing, optionally, capacitance 5pF-100pF.Similarly, the first resistor unit and second resistance in impedance amplifying unit
Unit is the equal resistance unit of resistance value, and optionally, resistance value is 1M Ω.
Specifically, the input impedance of differential operational amplifier OP1 and OP2 are infinitely great when switch K1 and switch K2 is disconnected.
When switch K1 closure, the input impedance of differential operational amplifier OP1 is equal to the resistance value of first resistor unit；When switch K2 is closed
When, the input impedance of differential operational amplifier OP2 is equal to the resistance value of second resistance unit.At the signal of differential amplification module
The symmetry of reason, the resistance value of first resistor unit and the resistance value of second resistance unit are equal, and therefore, switch K1 and switch K2's opens
Closing frequency and duty ratio should be set as identical.In embodiment, the opening and closing frequency of switch K1 and switch K2 is analog-to-digital conversion module
Ten times of sample frequency, duty ratio can according to the actual situation required for first resistor unit and second resistance unit it is equivalent
Resistance value is set.For example, the opening and closing frequency of configuration switch K1 and switch K2 are 1MHz, duty ratio 1%, then first resistor unit
Equivalent resistance be R1/ (1%)=100*R1, the equivalent resistance of second resistance unit is R2/ (1%)=100*R2, thus real
The multiplication of existing differential operational amplifier OP1 and operational amplifier OP2 input impedance.By adjusting the size of duty ratio, realization pair
The adjustment of differential operational amplifier input impedance, so as to adjust be made of first capacitor unit and first resistor unit
The 2nd RC filter response that one RC filter and the second capacitor cell and second resistance unit are constituted, wherein the
One RC filter and the 2nd RC filter are high-pass filter.
The first impedance adjustment unit further includes third switch subelement in one of the embodiments, and third switch is single
The first end of the first end connection first resistor unit of member, third switch the second end connection second switch subelement of subelement
Second end；Second impedance adjustment unit further includes the 4th switch subelement, the second electricity of first end connection of the 4th switch subelement
Hinder the first end of unit, the second end of the second end connection second switch subelement of the 4th switch subelement.
First impedance adjustment unit and the second impedance adjustment unit are symmetrical, the first impedance adjustment unit and the second impedance
The voltage for adjusting the points of common connection of unit is common-mode voltage VCM.With continued reference to Fig. 3, in embodiment, third switch subelement is
Switch K3, the 4th switch subelement is switch K4, closure switch K3 and switch K4, so that the first of differential amplification module 130 is defeated
The 4th voltage VIP of the tertiary voltage VIN and the second input terminal that enter end are charged to the first impedance adjustment unit and the second impedance tune in advance
Save the voltage VCM of the points of common connection of unit.
In one of the embodiments, biasing with differential conversion module include 3rd resistor unit, the 4th resistance unit and
5th resistance unit；The first end of 3rd resistor unit is for connecting bias supply, and the second end of 3rd resistor unit is for connecting
Connect sound pick up equipment, wherein the second end of 3rd resistor unit is the first end of biasing with differential conversion module；4th resistance unit
First end for connecting bias supply, the second end of the 4th resistance unit connects the first end of the 5th resistance unit, the 5th electricity
Hinder the second end ground connection of unit, wherein the second end of the 4th resistance unit is the second end of biasing with differential conversion module.
Wherein, 3rd resistor unit, the 4th resistance unit and the 5th resistance unit are adjustable resistance unit, it may include one
Or multiple adjustable resistance units.It can be by control units such as controllers to 3rd resistor unit, the 4th resistance unit and the 5th electricity
The resistance value of resistance unit is adjusted.With continued reference to Fig. 3, in embodiment, 3rd resistor unit is adjustable resistance R3, the 4th resistance list
Member is adjustable resistance R4, the 5th resistance unit is adjustable resistance R5, and sound pick up equipment is microphone M1.Adjustable resistance R3 and microphone
M1 connection changes the output end of the adjustable microphone M1 of adjustable resistance R3 resistance value, that is, biases first with differential conversion module
Hold voltage, i.e. first voltage Va1, so that microphone M1 works in normal working point.First voltage Va1 is microphone M1 phase
For the potential value on ground, i.e. Va1=RM1*Vbias/(R3+RM1), wherein RM1For the resistance built in microphone M1, VbiasFor biasing
The voltage of power supply.Adjustable resistance R4 and adjustable resistance R5 are connected on bias supply VbiasBetween ground, wherein adjustable resistance R4 and
The voltage of the points of common connection of adjustable resistance R5 is the voltage of biasing with the second end of differential conversion module, i.e. second voltage Vb1,
Wherein second voltage Vb1=R5*Vbias/(R4+R5).The resistance value of the 4th resistance unit and the 5th resistance unit is adjusted, so that biasing
It is in the voltage value of the second end of differential conversion module with biasing and the difference of the voltage value of the first end of differential conversion module
In preset threshold range, preset threshold range can be set according to actual conditions.Preferably, Va1 is equal with Vb1, at this point, biased electrical
On the Vbias of source noise partial pressure it is equal be added on Va1 and Vb1, at this time on Va1 and Vb1 noise partial pressure constitute the first common mode
Noise signal, convenient for inhibiting first common mode noise signal in subsequent differential amplification module.
Fig. 4 is a kind of the second structural schematic diagram of apparatus for processing audio provided by the embodiment of the utility model, such as Fig. 4 institute
Show, apparatus for processing audio further includes gain regulation module 150 in one of the embodiments,；Gain regulation module 150 connects difference
The first output end and second output terminal for dividing amplification module 130, for adjusting the gain factor of differential amplification module 130.
Gain regulation module 150 is to adjust the module of voltage gain amplification factor, and gain factor is equal to operational amplifier electricity
Press output amplitude divided by the voltage input amplitude of operational amplifier.As shown in figure 3, differential amplification module includes fortune in embodiment
Amplifier OP1 and OP2 are calculated, the output end of operational amplifier OP1 passes through the 6th resistance unit, the 7th resistance unit that are sequentially connected in series
The output end of operational amplifier OP2, the public company of the 6th resistance unit and the 7th resistance unit are connected to the 8th resistance unit
Contact connects the reverse input end of operational amplifier OP1, the points of common connection connection of the 7th resistance unit and the 8th resistance unit
The reverse input end of operational amplifier OP2, wherein the reverse input end of operational amplifier OP1 is the first of differential amplification module
Reverse input end, the reverse input end of operational amplifier OP2 are the second reverse input end of differential amplification module.In embodiment,
By adjusting the adjustable differential amplification of value relatable between the 6th resistance unit, the 7th resistance unit and the 8th resistance unit
The gain factor of the output signal of module.6th resistance unit, the 7th resistance unit and the 8th resistance unit may include one or
Multiple resistive elements, with continued reference to Fig. 3, the 6th resistance unit is resistance R6, and the 7th resistance unit is resistance R7, the 8th resistance list
Member is resistance R8.
With reference to Fig. 4, apparatus for processing audio further includes low-pass filtering module 160 in one of the embodiments,；Differential amplification
First output end of module 130 connects the second output terminal of differential amplification module 130 by low-pass filtering module 160.
Low-pass filtering module 160 is that the signal lower than cutoff frequency is allowed to pass through for filtering out high frequency signal, but high
In the intransitable electronic filtering device of the signal of cutoff frequency.In embodiment, low-pass filtering module 160 includes the 9th resistance list
Member, the tenth resistance unit and third capacitor cell.First output of the first end connection differential amplification module of the 9th resistance unit
End, the first end of the second end connection third capacitor cell of the 9th resistance unit.The first end of tenth resistance unit connects difference
The second output terminal of amplification module, the second end of the second end connection third capacitor cell of the tenth resistance unit.9th resistance list
Member and the tenth resistance unit may include one or more resistive elements, and third capacitor cell may include one or more capacitor members
Part.In Fig. 3, the 9th resistance unit is resistance R9, and the tenth resistance unit is resistance R10 and third capacitor cell is capacitor C3.It is real
It applies in example, low-pass filter is used to carry out low-pass filtering to third audio signal, wherein third audio signal is through differential amplification
Module inhibits the second audio signal after common-mode noise.
With continued reference to Fig. 4, apparatus for processing audio further includes the first analog-to-digital conversion module 170 in one of the embodiments,；
The first end of first input end the connection biasing and differential conversion module 110 of first analog-to-digital conversion module 170, for acquiring biasing
With the voltage of the first end of differential conversion module 110；The second input terminal connection biasing of first analog-to-digital conversion module 170 and difference
The second end of conversion module 110, for acquiring the voltage of biasing with the second end of differential conversion module 110.
First analog-to-digital conversion module 170 is used to convert analog signals into the device of digital signal, optionally, in embodiment
In be analog-digital converter.First analog-to-digital conversion module 170 includes first input end, the second input terminal and output end.Specifically, ginseng
Fig. 3 is examined, the first analog-to-digital conversion module 170 is ADC1, and the first input end of ADC1 acquires and inputs biasing and differential conversion module
Second input terminal of the voltage of 110 first end, i.e. first voltage Va1, ADC1 acquires and inputs biasing and differential conversion module
The voltage of 110 second end, i.e. second voltage Vb1.First analog-to-digital conversion module 170 exports collected voltage Va1 and Vb1
To control module, control module is compared the size of voltage Va1 and Vb1, with obtain voltage Va1 and Vb1 difference whether
In preset threshold range.
With continued reference to Fig. 4, apparatus for processing audio further includes the second analog-to-digital conversion module 180 in one of the embodiments,；
First output end of the first input end connection differential amplification module 130 of the second analog-to-digital conversion module 180, puts for acquiring difference
The voltage of first output end of big module 150；Second input terminal of the second analog-to-digital conversion module 180 connects differential amplification module
130 second output terminal, the voltage of the second output terminal for acquiring differential amplification module 130.
Second analog-to-digital conversion module 180 is used to convert analog signals into the device of digital signal, optionally, in embodiment
In be analog-digital converter.Second analog-to-digital conversion module 180 includes first input end, the second input terminal and output end.Specifically, ginseng
Examine Fig. 3, the second analog-to-digital conversion module 180 is ADC2, in embodiment, the first input end acquisition of ADC2 and input difference amplifies mould
Second input terminal of the voltage of the first output end of block 130, i.e. tertiary voltage Va2, ADC2 acquires and input difference amplification module
The voltage of 130 second output terminal, i.e. the 4th voltage Vb2.The output of second analog-to-digital conversion module 180 is by filtering adjustment module
120 and treated the audio signal of differential amplification module 130.
The apparatus for processing audio further includes the 4th capacitor cell, the 5th capacitor cell, the 6th in one of the embodiments,
Capacitor cell and the 7th capacitor cell.Wherein, the first output end of the first end connection differential amplification module of the 4th capacitor cell,
The first input end of the second end connection differential amplification module of 4th capacitor cell.The first end of 7th capacitor cell connects difference
The second output terminal of amplification module, the second input terminal of the second end connection differential amplification module of the 7th capacitor cell.5th electricity
Hold the first input end of the first end connection differential amplification module of unit, the second end ground connection of the 5th capacitor cell.6th capacitor
The first input end of the first end connection differential amplification module of unit, the second end ground connection of the 6th capacitor cell.Wherein, difference is put
The first input end of big module includes the first non-inverting input terminal and the first reverse input end, the second input terminal of differential amplification module
Including the second non-inverting input terminal and the second reverse input end.Optionally, the second end of the 4th capacitor cell connects differential amplification mould
First reverse input end of block, the second reverse input end of the second end connection differential amplification module of the 7th capacitor cell.5th
First non-inverting input terminal of the first end connection differential amplification module of capacitor cell, the first end of the 6th capacitor cell connect difference
First non-inverting input terminal of amplification module.With reference to Fig. 3, the 4th capacitor cell is capacitor C4, the 5th capacitor cell is capacitor C5,
Six capacitor cells are capacitor C6 and the 7th capacitor cell is capacitor C7, and the first non-inverting input terminal of differential amplification module, first are instead
Phase input terminal and the first output end are respectively the non-inverting input terminal, inverting input terminal and output end of difference amplifier OP1, and difference is put
The second non-inverting input terminal of module, the second inverting input terminal are respectively the same mutually defeated of difference amplifier OP2 with second output terminal greatly
Enter end, reverse input end and output end.
With continued reference to Fig. 3, audio processing chip provided by the embodiment of the utility model, the sound including any of the above-described embodiment
Frequency processing device.Apparatus for processing audio is integrated in inside audio processing chip 30.Optionally, audio processing chip 30 can be specially
The chip of door processing audio signal, is also possible to other chips with audio processing function.Due to being referred in above-described embodiment
Apparatus for processing audio have the effect of good inhibition noise, and the capacitance of first capacitor unit and the second capacitor cell compared with
Small, small volume optimizes audio so that first capacitor unit and the second capacitor cell are integrated in inside audio processing chip
Handle the performance of chip.Each functional module in apparatus for processing audio is adjusted by the control unit of built-in chip type and
Control, to realize audio processing, improves the quality of audio signal.Audio processing chip provided in this embodiment includes above-mentioned any
The apparatus for processing audio that embodiment provides, has corresponding function and beneficial effect.
Audio processing system provided by the embodiment of the utility model, audio processing chip including any of the above-described embodiment and
Sound pick up equipment.Optionally, audio processing chip is integrated with the apparatus for processing audio in any of the above-described embodiment, sound pick up equipment setting
In chip exterior.In embodiment, the first end of sound pick up equipment connection biasing and differential conversion module, to biasing and differential conversion mould
The first end of block exports the first audio signal.Audio processing system provided in this embodiment includes what above-mentioned any embodiment provided
Apparatus for processing audio has corresponding function and beneficial effect.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (11)
1. a kind of apparatus for processing audio, which is characterized in that including biasing and differential conversion module, filtering adjustment module and difference
Amplification module；Wherein, the filtering adjustment module includes the equal first capacitor unit and second of impedance amplifying unit, capacitance
Capacitor cell；
The biasing is used to connect the first end of sound pick up equipment and the first capacitor unit with the first end of differential conversion module,
To receive the first audio signal of the sound pick up equipment output, and first audio signal is exported to the first capacitor unit
With the first noise signal；It is described to bias the first end that second capacitor cell is connect with the second end of differential conversion module, it uses
In to second capacitor cell export the second noise signal；Wherein, first noise signal and second noise signal
For the first common mode noise signal；
The first capacitor unit is used to export the second audio signal and third to the first input end of the differential amplification module
Noise signal, second capacitor cell export the 4th noise signal to the second input terminal of the differential amplification module, wherein
The third noise signal and the 4th noise signal are the second common mode noise signal；
The first end of the impedance amplifying unit connects the second end of the first capacitor unit, the second end of impedance amplifying unit
The second end for connecting second capacitor cell, for amplifying the second end and the second capacitor cell of the first capacitor unit
Impedance between second end；
The first input end of the differential amplification module connects the first end of the impedance amplifying unit, the differential amplification module
The second input terminal connect the second end of the impedance amplifying unit, the differential amplification module is for inhibiting the third noise
Signal and the 4th noise signal, and export third audio signal.
2. apparatus for processing audio according to claim 1, which is characterized in that the impedance amplifying unit includes the first impedance
Adjust unit and the second impedance adjustment unit；
The first end of first impedance adjustment unit connects the second end of the first capacitor unit, and first impedance is adjusted
The second end of unit connects the second end of second impedance adjustment unit, the first end connection of second impedance adjustment unit
The second end of second capacitor cell；
First impedance adjustment unit is used to adjust the second end of the first capacitor unit and second impedance adjusts list
Impedance between the second end of member；
Second impedance adjustment unit is used to adjust the second end of second capacitor cell and first impedance adjusts list
Impedance between the second end of member.
3. apparatus for processing audio according to claim 2, which is characterized in that first impedance adjustment unit includes first
It switchs subelement and first resistor unit, second impedance adjustment unit includes second switch subelement and second resistance list
Member；
The first end of the first resistor unit connects the second end of the first capacitor unit, and the of the first resistor unit
Two ends connect the first end of the first switch subelement, and the second end of the first switch subelement connects the second switch
The second end of subelement, the first end of the second switch subelement connect the second end of the second resistance unit, and described
The first end of two resistance units connects the second end of second capacitor cell.
4. apparatus for processing audio according to claim 3, which is characterized in that the first impedance adjustment unit further includes that third is opened
Climax unit, the first end of the third switch subelement connect the first end of the first resistor unit, the third switch
The second end of subelement connects the second end of the second switch subelement；
Second impedance adjustment unit further includes and the 4th switch subelement, the first end of the 4th switch subelement connect
The second end of the first end of the second resistance unit, the 4th switch subelement connects the of the second switch subelement
Two ends.
5. apparatus for processing audio according to claim 1, which is characterized in that the biasing includes the with differential conversion module
Three resistance units, the 4th resistance unit and the 5th resistance unit；
The first end of the 3rd resistor unit is for connecting bias supply, and the second end of the 3rd resistor unit is for connecting
Pickup transposition, wherein the second end of the 3rd resistor unit is the first end of the biasing and differential conversion module；
The first end of 4th resistance unit is for connecting the bias supply, the second end connection of the 4th resistance unit
The first end of 5th resistance unit, the second end ground connection of the 5th resistance unit, wherein the 4th resistance unit
Second end is the second end of the biasing and differential conversion module.
6. apparatus for processing audio according to claim 1, which is characterized in that further include gain regulation module；
The gain regulation module connects the first output end and second output terminal of the differential amplification module, described for adjusting
The gain factor of differential amplification module.
7. apparatus for processing audio according to claim 1, which is characterized in that further include low-pass filtering module；
First output end of the differential amplification module connects the of the differential amplification module by the low-pass filtering module
Two output ends.
8. apparatus for processing audio according to claim 1, which is characterized in that further include the first analog-to-digital conversion module；
The first input end of first analog-to-digital conversion module connects the first end of the biasing and differential conversion module, for adopting
Collect the voltage-to-ground value of the biasing and the first end of differential conversion module；
Second input terminal of first analog-to-digital conversion module connects the second end of the biasing and differential conversion module, for adopting
Collect the voltage-to-ground value of the biasing and the second end of differential conversion module.
9. apparatus for processing audio according to claim 1, which is characterized in that further include the second analog-to-digital conversion module；
The first input end of second analog-to-digital conversion module connects the first output end of the differential amplification module, for acquiring
The voltage value of first output end of the differential amplification module；
Second input terminal of second analog-to-digital conversion module connects the second output terminal of the differential amplification module, for acquiring
The voltage value of the second output terminal of the differential amplification module.
10. a kind of audio processing chip, which is characterized in that including such as described in any item apparatus for processing audio of claim 1-9.
11. a kind of audio processing system, which is characterized in that filled including audio processing chip described in any one of claim 10 and pickup
It sets；
The sound pick up equipment connects the first end of the biasing and differential conversion module, and the sound pick up equipment is used for the biasing
The first audio signal is exported with differential conversion module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821822293.1U CN208891057U (en) | 2018-11-06 | 2018-11-06 | Apparatus for processing audio, chip and system |
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| CN201821822293.1U CN208891057U (en) | 2018-11-06 | 2018-11-06 | Apparatus for processing audio, chip and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109275071A (en) * | 2018-11-06 | 2019-01-25 | 珠海市杰理科技股份有限公司 | Apparatus for processing audio, chip, system and method |
| CN114222232A (en) * | 2021-12-31 | 2022-03-22 | 杭州士兰微电子股份有限公司 | MEMS system and signal processing circuit |
-
2018
- 2018-11-06 CN CN201821822293.1U patent/CN208891057U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109275071A (en) * | 2018-11-06 | 2019-01-25 | 珠海市杰理科技股份有限公司 | Apparatus for processing audio, chip, system and method |
| CN109275071B (en) * | 2018-11-06 | 2022-03-04 | 珠海市杰理科技股份有限公司 | Audio processing device, chip, system and method |
| CN114222232A (en) * | 2021-12-31 | 2022-03-22 | 杭州士兰微电子股份有限公司 | MEMS system and signal processing circuit |
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