CN105025418B - A kind of active noise reduction controller - Google Patents
A kind of active noise reduction controller Download PDFInfo
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- CN105025418B CN105025418B CN201410155861.7A CN201410155861A CN105025418B CN 105025418 B CN105025418 B CN 105025418B CN 201410155861 A CN201410155861 A CN 201410155861A CN 105025418 B CN105025418 B CN 105025418B
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Abstract
The present invention discloses a kind of active noise reduction controller, including substrate, silicon microphone, the asic chip and shell integrated by asic technology, wherein：The silicon microphone and the asic chip are fixed on the substrate and in the enclosure space that the shell is formed with the substrate, and connected by first group of gold thread pressure welding between the silicon microphone and the asic chip, the asic chip is connect with the substrate by second group of gold thread pressure welding；The position opposite with the silicon microphone is equipped with acoustic aperture on the substrate or the shell, it is additionally provided with lead pad on the substrate, the lead pad includes headphone unit anode pad, headphone unit negative terminal pad, power input pad, audio input end pad and common ground end pad, and the lead pad is connect by the printed circuit on the substrate with second group of gold thread.
Description
Technical field
The present invention relates to earphone noise reduction fields, in particular to a kind of active noise reduction controller.
Background technology
In today that electronic product is popularized, earphone is at essential daily necessities in for people's lives.The type of earphone is very
More, In-Ear, wear-type is colourful, of all shapes and colors, but how effectively to reduce outside noise influence is to promote earphone to listen tone sense
The common issue received.Common headphones are to the sound wave that the barrier of ambient noise is by earphone material property to being transmitted in air
Energy is decayed, but this mode usually can play the noise of thousands of Hz or more relatively good shielding action, to hundreds of
The barriering effect of Hz low frequency noises below is still not ideal enough.The principle of active noise reduction earphone be borrow headphone unit generate with
Extraneous noise has the sound wave of same amplitude but opposite in phase, is cancelled one another out with extraneous noise in duct, noise energy is made to obtain
To reduce.In order to realize active noise reduction, need to be arranged on earphone microphone for detecting ambient noise, the position of microphone can
To be the side in phonation unit towards ear（Residual noise is detected, feedback-type active noise reduction is corresponded to）, can also be by
Outside nearly earphone（Environmental noise is detected, feed-forward type active noise reduction is corresponded to）.Active noise reduction earphone is opening active noise reduction function
When, no matter being played either with or without sound, headphone unit is all in working condition to send out noise reduction sound wave, and required drive signal is by circuit
It generates, is to be handled to obtain through active noise reduction circuit signal by microphone signal, and this partial circuit needs power supply to supply.Earmuff
The active noise reduction earphone of formula is equipped with the battery of circuit board and power supply in casing.
In-Ear Headphones（Or built-in earplug）Phonation unit in front of be equipped with a bit of conduit, colloid plug is cased on conduit
Head, chock plug is filled in duct mouth and is bonded with duct when use, and the seal of earphone is made to improve.This shape and structure design are not only
Compact volume and convenience, and the obstructing capacity to external noise is improved, become the first choice of miniaturization active noise reduction earphone.In-Ear master
Dynamic noise cancelling headphone increases the microphone of noise in detection external noise or duct on the basis of common In-Ear Headphones.Cause
Small for In-Ear Headphones, the cavity volume smaller after merging microphone in earphone can not provide space and actively drop
Make an uproar needs signal processing circuit board and the battery powered to circuit, so In-Ear active noise reduction earphone on the market is in ear
There are one wire-controlled apparatus, the wire-controlled apparatus to contain active noise reduction circuit and battery on machine line.The In-Ear drop of mainstream at present
It makes an uproar earphone, in such a way that Dolby circuit is arranged in ear engine body exterior.The general 3.5mm stereo audios of this structure compatible
Input plug relaxes the volume requirement of Dolby circuit, but cost is higher, reduces portability, and since microphone is from earphone
Body have passed through longer line to Dolby circuit, and microphone signal is made to be easy to be interfered and generate noise.
Such as, China Patent Publication No. is the utility model patent of CN201947421U, provides a kind of In-Ear noise reduction ear
Machine, this earphone are built-in with a shell in ear casing, and earphone phonation unit is mounted on shell and detects the sensing of ambient noise
Device (i.e. microphone).Such module assembling mode simplifies the design of earphone, but shell therein and sensor still occupy
More space in earphone body, operatic tunes volume reduce.Importantly, the control circuit of active noise reduction still need it is external.
For another example, a kind of earphone that eliminating noise of patent of invention and its driving that China Patent Publication No. is CN102137319A
Circuit, disclose it is a kind of use SOC（System On a Chip, systemonchip）The active noise reduction earphone driving electricity of technology
Active noise reduction function is integrated into one chip by road, simplifies wiring and active noise reduction circuit is allow to be placed to ear casing
It is interior.But this chip pin is more, needs to be welded together with peripheral cell on circuit boards, this circuit board certainly will need to account for
According to considerable part space in ear casing.Because residual volume very little in ear casing, is not influencing ear after placing microphone
It is difficult to accommodate the circuit, also, this SOC chip is realized by analog form under conditions of machine appearance, parameter is set
Surely adjustment is connected with pin by peripheral cell, debugging process is cumbersome.In the realization of this scheme, microphone, circuit board and ear
Assembly of the machine unit three parts in small size casing is complicated, occupies the low frequency characteristic that excessive cavity volume has an effect on playback.
Invention content
The present invention provides a kind of active noise reduction controller, for In-Ear Headphones to realize the active noise reduction of low cost, and
The contour structures of earphone are varied without, it is easy to use.
In order to achieve the above objectives, the present invention provides a kind of active noise reduction controller, including substrate, silicon microphone, pass through
ASIC（Application Specific Integrated Circuit, application-specific integrated circuit）The asic chip of Integration ofTechnology
And shell, wherein：
The substrate is equipped with printed circuit；The silicon microphone and the asic chip fix on the substrate simultaneously position
In in the enclosure space that the shell and the substrate are formed, and pass through first between the silicon microphone and the asic chip
Group gold thread pressure welding connection, the asic chip are connect with the substrate by second group of gold thread pressure welding；
The position opposite with the silicon microphone is equipped with acoustic aperture on the substrate or the shell, so that ambient noise passes through
The acoustic aperture is acquired by the silicon microphone and is converted into analog electrical signal；
It is additionally provided with lead pad on the substrate, the lead pad includes that headphone unit anode pad, headphone unit are negative
Hold pad, power input pad, audio input end pad and common ground end pad, the headphone unit anode pad, institute
State headphone unit negative terminal pad, the audio input end pad, the power input pad and common ground end pad
The earphone driving of the asic chip is being connected to just by printed circuit on the substrate and second group of gold thread respectively
Pin, audio input pin, power input pin and publicly pin are born in pin, earphone driving.
Wherein, the asic chip is integrated with sequentially connected preamplifier circuit for microphone, A/D conversion circuits, number
Signal processing circuit, D/A conversion circuits, audio signal hybrid circuit, differential drive circuit, the first analog switch and the second simulation
Switch, wherein the preamplifier circuit for microphone receives the analog electrical signal of the silicon microphone output and to simulation electricity
Signal is amplified processing, and the analog electrical signal after enhanced processing is passed to the A/D conversion circuits, and the A/D turns
It changes circuit the analog electrical signal of reception is converted into digital electric signal and is transferred to the digital signal processing circuit, the number
Signal processing circuit is sent into the D/A conversion circuits, the D/A conversion circuits after being filtered the digital electric signal
Digital electric signal after being filtered is reduced into analog electrical signal, through the D/A conversion circuits reduction analog electrical signal into
Enter the audio signal hybrid circuit, it is transmitted the audio come letter by the audio signal hybrid circuit with by audio input pin
To the differential drive circuit, the mixed signal after superposition is transformed into difference by the differential drive circuit to be believed for output after number superposition
Number and Buffer output, the anode of the differential signal connect the first analog switch, the negative terminal connection of the differential signal described the
Two analog switches.
The wherein described digital signal processing circuit includes the combination of 5~10 single orders or second order IIR filter, and therein 3
The coefficient of iir filter described in~6 is by register configuration, to make the frequency response of entire digital signal processing circuit
It is adjusted by register, to coordinate the earphone system with different frequency response characteristic, realizes that digital electric signal is finally changed into
The sound wave of the sound wave and ambient noise that are exported by the headphone unit meets equal in magnitude, opposite in phase relationship.
Wherein, first analog switch and the bis- tunnel selecting switch of the second analog switch Dou Wei, and first mould
Quasi- switch and the second analog switch synchronism switching, two road input terminals of first analog switch are separately connected the difference
The anode of signal and the audio input pin, the output end of first analog switch connect the earphone and drive positive pin,
Realize the switching that the earphone drives positive pin to be connect with the anode of the differential signal or the audio signal input end, it is described
Two road input terminals of the second analog switch are separately connected the negative terminal of the differential signal and the publicly pin, second mould
The output end of quasi- switch connects the earphone driving and bears pin, realizes that the negative of pin and the differential signal is born in the earphone driving
The switching of end or common ground end link, when first analog switch switch to the anode of the differential signal with it is described
When earphone drives positive pin connection, negative terminal and the earphone of the second analog switch synchronism switching to the differential signal drive
Dynamic negative pin connection, the differential signal drive headphone unit, the active noise reduction controller to generate the drop for offsetting ambient noise
Noise cancellation signal is operated in active noise reduction pattern；When first analog switch switches to the audio signal input end and the ear
When machine drives positive pin connection, the second analog switch synchronism switching to the publicly pin is born with earphone driving to be drawn
Foot connects, at this point, the preamplifier circuit for microphone of the asic chip, the A/D conversion circuits, the digital signal
Processing circuit, the D/A conversion circuits, the audio signal hybrid circuit and the differential drive circuit are closed, by the sound
Frequency input pin transmits the audio signal come and directly drives headphone unit, and it is outer that the earphone active noise reduction controller does not generate counteracting
The de-noising signal of boundary's noise, is operated in direct mode operation.
Wherein, the asic chip is also integrated with power supply monitoring module and system management module, the power supply monitoring module
Voltage for monitoring the power input, the system management module include programmable storage, the programmable storage
Device stores the default value of the register, and the default value is packed into the register in system electrification, when the power supply
The voltage of monitoring module monitors to the power input is less than a voltage threshold between preset 1.6V~2.1V
When, first analog switch is switched to the audio signal input end and is driven just with the earphone by the system management module
Pin connects, and drives negative pin to connect with the earphone the second analog switch synchronism switching to the publicly pin,
Headphone unit is directly driven by input audio signal, meanwhile, the preamplifier circuit for microphone, A/D conversion circuits, number letter
Number processing circuit, D/A conversion circuits, audio signal hybrid circuit, differential drive circuit are in closed state, the active drop
Controller of making an uproar is operated in the direct mode operation；It is somebody's turn to do when the voltage of the power supply monitoring module monitors to the power input is higher than
When voltage threshold, first analog switch is switched to the anode of the differential signal and the ear by the system management module
Machine drives positive pin connection, and the negative terminal of the second analog switch synchronism switching to the differential signal and the earphone are driven
Negative pin connection, the differential signal drive headphone unit, the active noise reduction controller to be operated in the active noise reduction pattern,
All circuit function modules normal work on the asic chip.
Compared with prior art, beneficial effects of the present invention are embodied in：
The active noise reduction controller of the present invention, using silicon microphone and the asic chip integrated by asic technology, volume
Smaller, can be implanted directly into existing earphone without change earphone contour structures, it is easy-to-use；Changed using digital processing circuit
The phase and amplitude of signal, more accurately, debugging are more convenient, and using the combination of multiple single orders or second order IIR filter, can root
It is very convenient according to environment and noise reduction demand flexible design；Pin is less, simple and practical；It is controlled by supply voltage selectable
Two kinds of operating modes mutually switch, and implement active noise reduction when needing noise reduction, are directly driven by input signal when not needing noise reduction
Earphone, Dolby circuit is closed and controller is in extremely low power dissipation state.
Description of the drawings
Fig. 1 is the structural schematic diagram of the active noise reduction controller of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the asic chip of the active noise reduction controller of one embodiment of the invention；
Fig. 3 is the schematic diagram of the active noise reduction controller application in In-Ear Headphones of one embodiment of the invention.
Reference sign：101- substrates；102- acoustic aperture；103- lead pad；104 silicon microphones；105-ASIC chips；
106- shells；First group of gold thread of 107-；Second group of gold thread of 108-；201- preamplifier circuit for microphone；202-A/D conversion electricity
Road；203- digital signal processing circuits；204-D/A conversion circuits；205- audio signal hybrid circuits；206- differential driving electricity
Road；The first analog switches of 207-；The second analog switches of 208-；301- earphone cases；302- earphone silica gel sheaths；303- earphone lists
Member；304- active noise reduction controllers；305- earphone Air Filters；306- earphone cables；The first connecting lines of 307-；The connections of 308- second
Line.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of not making the creative labor
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of the active noise reduction controller of one embodiment of the invention.Such as Fig. 1 institutes
Show, a kind of active noise reduction controller provided by the invention, including substrate 101, silicon microphone 104, by asic technology integrate
Asic chip 105 and shell 106.Wherein, substrate 101 is printed circuit board.When implementation, silicon microphone 104 and asic chip 105
Fixed shell 106 and substrate 101 form closed cavity on the substrate 101, and the closed cavity is by silicon microphone 104 and ASIC cores
Piece 105 is closed to protected from extraneous damage, meanwhile, have one to open with 104 corresponding position of silicon microphone on substrate 101
Mouth is acoustic aperture 102, so that ambient noise is acquired by acoustic aperture 102 by silicon microphone 104.When implementation, acoustic aperture 102 can also be arranged
The position corresponding with silicon microphone 104 on shell 106.Pass through first group of gold thread between silicon microphone 104 and asic chip 105
107 connections, wherein first group of gold thread 107 is including microphone signal, microphone bias voltage and microphone, to transmit silicon wheat
Gram wind 104 by ambient noise conversion Lai analog electrical signal.Pass through second group of gold thread 108 between asic chip 105 and substrate 101
Connection, second group of gold thread 108 include at least power input, audio signal input, publicly, earphone driving just and earphone driving
It is negative.Part except the enclosure space formed with shell 106 on substrate 101 is equipped with lead pad 103, the portion of asic chip 105
It separates foot and lead pad 103 is led to by the printed circuit in second group of gold thread 108 and substrate 101.In the reality of the present invention
It applies in example, lead pad 103 includes headphone unit anode pad SPK+, headphone unit negative terminal pad SPK-, power input weldering
Disk VDD, audio input end pad AIN and common ground end pad GND.
Referring to Fig. 2, Fig. 2 is the structural schematic diagram of the asic chip of the active noise reduction controller of one embodiment of the invention.
As shown in Fig. 2, in the asic chip of the active noise reduction controller of the present invention, it is integrated with the preposition amplification electricity of sequentially connected microphone
Road 201, A/D conversion circuits 202, digital signal processing circuit 203, D/A conversion circuits 204, audio signal hybrid circuit 205,
Differential drive circuit 206, the first analog switch 207 and the second analog switch 208.Preamplifier circuit for microphone 201 is for connecing
Receive the microphone signal that silicon microphone 104 exports（Analog electrical signal）, and carry out enhanced processing；A/D conversion circuits 202 are used for will
201 amplified analog electrical signal of preamplifier circuit for microphone is converted into digital electric signal；Digital signal processing circuit 203 is used
In processing digital electric signal, including adjusting amplitude and phase；D/A conversion circuits 204 are used for the digital signal after frequency equilibrium
Analog electrical signal is re-converted into for noise reduction；The audio that audio signal hybrid circuit 205 is used to input audio frequency apparatus is believed
It number is overlapped with for the analog electrical signal of noise reduction；Differential drive circuit 206 is for becoming mixed analog electrical signal
The differential signal of headphone unit is driven, and is connected to earphone list by the first analog switch 207, the second analog switch 208 respectively
Member.
When it is implemented, noise signal enters active noise reduction controller by acoustic aperture 102, received by silicon microphone 104, silicon
Noise sound wave is converted into analog electrical signal and is connected to asic chip 105, ASIC cores by first group of gold thread 107 by microphone 104
The preamplifier circuit for microphone 201 of piece 105 receives the analog electrical signal and passes to A/D conversion circuits after carrying out enhanced processing
The analog electrical signal is converted into digital electric signal and passes to digital signal processing circuit 203 by 202, A/D conversion circuits 202, number
Word signal processing circuit 203 adjusts the amplitude and phase of the digital signal, it is made to be transformed into the digital telecommunication for offset noise
Number；D/A conversion circuits 204 receive the digital electric signal for offset noise and are converted into the analog telecommunications for offset noise
Number, it is transferred to audio signal hybrid circuit 205；Audio signal hybrid circuit 205 obtains the analog electrical signal for offset noise
While also obtain the audio signal of audio frequency apparatus input, two kinds of analog signals be superimposeds by audio signal hybrid circuit 205, and general
Analog signal transmission after superposition is to differential drive circuit 206；Differential drive circuit 206 delays the analog electrical signal after superposition
Punching becomes the differential signal for driving headphone unit, and is connected by the control of the first analog switch 207, the second analog switch 208
And headphone unit is driven to export sound wave.Sound wave and the noise sound wave of headphone unit output meet it is automatic be superimposed, because headphone unit is defeated
In the sound wave gone out include sound wave equal with noise sound wave amplitude, opposite in phase, after meeting with noise sound wave can cancellation, thus reach
To the effect of noise reduction.
When it is implemented, digital signal processing circuit 203 is the key that obtain de-noising signal, and in the present embodiment, number letter
Number processing circuit 203 includes the combination of 5~10 single orders or second order IIR filter, to be filtered to the digital electric signal
Wave processing, adjusts the amplitude and phase of digital electric signal, the frequency response of 3~6 iir filters therein is changed by register
Become, to coordinate the earphone system with different frequency response characteristic to use, makes what the digital electric signal was finally converted into pass through institute
The sound wave of the sound wave and ambient noise of stating headphone unit output has equal in magnitude, opposite in phase relationship.When it is implemented, 5
The combination of~10 single orders or second order IIR filter is obtained by largely calculating and testing, and cannot then meet drop less than 5
It makes an uproar requirement, then there is no bigger promotion to noise reduction higher than 10.When specific design, the number of single order or second order IIR filter
It is adjusted according to practical noise reduction demand, General Second Order iir filter has more rich frequency response characteristic, but is not easy to adjust.5~
There are 3~6 variable coefficient, the coefficient is used to change by register in the combination of 10 single orders or second order IIR filter, remaining
Using fixed coefficient, it not only ensure that and ensured that iir filter few as possible adjusts number in design process, but also can meet and pass through adjusting
The coefficient of these iir filters is to meet the noise reduction demand of different frequency characteristic earphone.Wherein, the design root of iir filter
It is determined according to the amplitude and phase compensation that need to carry out different frequency on signal path, in actual design, audio detection is needed to fill
It sets frequency response and earphone to earphone and analysis is measured to the attenuation characteristic of ambient noise, according to Analysis result calculation number
The best value of the coefficient of the iir filter of variable coefficient, is determined as preset value or design value, as default value in filter.
When it is implemented, asic chip 105 is also integrated with power supply monitoring module and system management module, the power supply monitoring
Module is used to monitor the voltage of active noise reduction controller, and the system management module includes programmable storage, described programmable
Memory preserves the default value of the register of storage iir filter coefficient, and is packed into the default value in system electrification
Corresponding registers have a voltage threshold inside asic chip, which is a fixed value of 1.6V~2.1V, when described
When the voltage of power supply monitoring module monitors to active noise reduction controller is less than the voltage threshold, the earphone active noise reduction controller
It is operated in the direct mode operation, when the voltage of the power supply monitoring module monitors to active noise reduction controller is higher than the voltage threshold
When, the earphone active noise reduction controller is operated in the active noise reduction pattern.
When it is implemented, the direct mode operation of active noise reduction controller and active noise reduction pattern are by the first analog switch
207 and second analog switch 208 realize.As shown in Fig. 2, bis- tunnel of the first analog switch 207 and 208 Dou Wei of the second analog switch
Selecting switch, and the first analog switch 207 and the selection of 208 synchronism switching of the second analog switch, two tunnels of the first analog switch 207
Input terminal is separately connected the anode of the differential signal and the audio input pin, and the output end of first analog switch connects
It connects the earphone and drives positive pin, realize the differential signal that the earphone drives positive pin to be exported with differential drive circuit 206
Switch between anode and audio signal input end, two road input terminals of the second analog switch 208 are separately connected the differential signal
Negative terminal and the publicly pin, the output end of second analog switch connect the earphone driving and bear pin, realize institute
It states earphone driving and bears and switch between pin and the negative terminal and common ground end of the differential signal of the output of differential drive circuit 206, when
When the voltage of the power supply monitoring module monitors to active noise reduction controller is higher than the voltage threshold of setting, the first analog switch
207 anodes for switching to the differential signal of the output of differential drive circuit 206 drive positive pin to connect with the earphone, the second simulation
The negative terminal for the differential signal that 208 synchronism switching of switch is exported to differential drive circuit 206 drives negative pin to connect with the earphone,
Active noise reduction controller generates the de-noising signal for offsetting ambient noise, is operated in active noise reduction pattern；When the power supply monitoring mould
When block monitors that the voltage of active noise reduction controller is less than the voltage threshold, it is defeated that the first analog switch 207 switches to audio signal
Enter end drives positive pin to connect with the earphone, 208 synchronism switching of the second analog switch to common ground end and the ear
Pin connection is born in machine driving, at this point, the preamplifier circuit for microphone 201 of asic chip 105, A/D conversion circuits 202, number
Signal processing circuit 203, D/A conversion circuits 204, audio signal hybrid circuit 205 and differential drive circuit 206 are closed, institute
It states earphone active noise reduction controller and does not generate the de-noising signal for offsetting ambient noise, be operated in direct mode operation.
Referring to Fig. 3, Fig. 3 is the signal of the active noise reduction controller application in In-Ear Headphones of one embodiment of the invention
Figure.As shown in figure 3, the active noise reduction controller 304 of the present invention is installed on earphone list in earphone case 301 in In-Ear Headphones
In first 303 subsequent cavitys, the space of far smaller than headphone unit 303, the lead weldering of active noise reduction controller 304 are only occupied
103 number of pads of disk is few, and wiring is also very easy.Earphone cable 306 includes three conducting wires：Power positive end line, audio signal input
Line and common ground, three conducting wires i.e. the second connecting line 308 are separately connected power input pad VDD, the sound of lead pad 103
The frequency input terminal pad AIN and common ground end pad GND.The headphone unit anode pad SPK+ and ear of lead pad 103
Machine unit negative terminal pad SPK- is connected with the anode of headphone unit, negative terminal respectively by the first connecting line 307.
When it is implemented, earphone silica gel sheath 302 is put into user's ear, noise sound wave by earphone Air Filter 305 into
Enter in active noise reduction controller 304, noise sound wave passes through the processing of active noise reduction controller 304, and it is connect with by second
Output difference drive signal after the audio signal mixing that line 308 inputs, and headphone unit is transmitted to by the first connecting line 307
303, which is transformed into voice signal and exported by headphone unit 303, the sound wave and noise of the voice signal of output
Sound wave is overlapped mutually, and is balanced out the sound wave that the audio signal that only audio frequency apparatus transmits after noise section is converted into and is entered user
Ear, to realize noise reduction.
One of ordinary skill in the art will appreciate that：The module in device in embodiment can describe to divide according to embodiment
It is distributed in the device of embodiment, respective change can also be carried out and be located in one or more devices different from the present embodiment.On
The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment or equivalent replacement of some of the technical features；And
These modifications or replacements, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (4)
1. a kind of active noise reduction controller, which is characterized in that including substrate, silicon microphone, the ASIC integrated by asic technology
Chip and shell, wherein：
The silicon microphone and the asic chip are fixed on the substrate and positioned at the shell and substrate formation
In enclosure space, and connected by first group of gold thread pressure welding between the silicon microphone and the asic chip, the ASIC cores
Piece is connect with the substrate by second group of gold thread pressure welding；
The position opposite with the silicon microphone is equipped with acoustic aperture on the substrate or the shell, so that ambient noise is described in
Acoustic aperture is acquired by the silicon microphone and is converted into analog electrical signal；
Lead pad is additionally provided on the substrate, the lead pad includes headphone unit anode pad, the weldering of headphone unit negative terminal
Disk, power input pad, audio input end pad and common ground end pad, the headphone unit anode pad, the ear
Machine unit negative terminal pad, the audio input end pad, the power input pad and common ground end pad difference
The earphone that the asic chip is connected to by printed wire in the substrate and second group of gold thread drives positive pin, ear
Pin, audio input pin, power input pin and publicly pin are born in machine driving；
The asic chip is integrated with sequentially connected preamplifier circuit for microphone, A/D conversion circuits, Digital Signal Processing electricity
Road, D/A conversion circuits, audio signal hybrid circuit, differential drive circuit, wherein the preamplifier circuit for microphone receives
Analog electrical signal from the silicon microphone and processing is amplified to the analog electrical signal, and by the mould after enhanced processing
Quasi- electric signal passes to the A/D conversion circuits, and analog electrical signal is converted into digital electric signal and passed by the A/D conversion circuits
It is handed to the digital signal processing circuit, the digital signal processing circuit is sent after being filtered the digital electric signal
Enter the D/A conversion circuits, the digital electric signal after being filtered is reduced into analog electrical signal by the D/A conversion circuits, warp
The analog electrical signal of the D/A conversion circuits reduction enters the audio signal hybrid circuit, the audio signal hybrid circuit
It is exported to the differential drive circuit, the difference with being transmitted after the audio signal come is superimposed by the audio input pin
Mixed signal after superposition is transformed into differential signal with driving circuit and Buffer output is to drive headphone unit,
The digital signal processing circuit includes the combination of 5~10 single orders or second order IIR filter, described in 3~6 therein
Iir filter coefficient by register configuration, to make the frequency response of entire digital signal processing circuit pass through deposit
Device is adjusted, and to coordinate the earphone system with different frequency response characteristic, realizes that digital electric signal is finally changed by described
The sound wave of headphone unit output and the sound wave of ambient noise meet equal in magnitude, opposite in phase relationship.
2. active noise reduction controller according to claim 1, which is characterized in that be additionally provided with the first mould on the asic chip
Quasi- switch and the second analog switch, first analog switch and the bis- tunnel selecting switch of the second analog switch Dou Wei, and institute
State the first analog switch and the second analog switch synchronism switching selection, two road input terminal difference of first analog switch
The anode of the differential signal and the audio input pin are connected, the output end of first analog switch connects the earphone
Positive pin is driven, realizes that the earphone drives positive pin to be connect with the anode of the differential signal or the audio signal input end
Switching, two road input terminals of second analog switch are separately connected the negative terminal of the differential signal and described publicly draw
Foot, the output end of second analog switch connect the earphone driving and bear pin, realize that pin and institute are born in the earphone driving
The negative terminal of differential signal or the switching of publicly pin connection are stated, when first analog switch switches to the difference letter
Number anode and the earphone when positive pin being driven connect, the second analog switch synchronism switching to the differential signal is born
End drives negative pin to connect with the earphone, and the differential signal drives headphone unit, the active noise reduction controller output to support
Disappear the de-noising signal of ambient noise, is operated in active noise reduction pattern；When first analog switch switches to the audio signal
When input terminal drives positive pin to connect with the earphone, the second analog switch synchronism switching to the publicly pin and institute
State earphone driving bear pin connection, by the audio input pin transmit Lai audio signal directly drive headphone unit, it is described
Active noise reduction controller is operated in direct mode operation.
3. active noise reduction controller according to claim 2, which is characterized in that the asic chip is also integrated with power supply prison
Module and system management module are surveyed, the power supply monitoring module is used to monitor the voltage of the power input, when the power supply
The voltage of monitoring module monitors to the power input is less than a voltage threshold between preset 1.6V~2.1V
When, first analog switch is switched to the audio signal input end and is driven just with the earphone by the system management module
Pin connects, and drives negative pin to connect with the earphone the second analog switch synchronism switching to the publicly pin,
And the preamplifier circuit for microphone, the A/D conversion circuits, the digital signal processing circuit, the D/A are converted into electricity
Road, the audio signal hybrid circuit and the differential drive circuit are closed, and the audio input pin transmits the audio letter come
Number headphone unit is directly driven, the active noise reduction controller is operated in the direct mode operation；When the power supply monitoring module is supervised
When measuring the voltage of the power input and being higher than the voltage threshold, the system management module is by the preposition amplification of the microphone
Circuit, the A/D conversion circuits, the digital signal processing circuit, the D/A conversion circuits, audio signal mixing electricity
Road and the differential drive circuit are opened, and first analog switch is switched to the anode of the differential signal and the earphone
It drives positive pin to connect, the negative terminal of the second analog switch synchronism switching to the differential signal and the earphone is driven negative
Pin connects, and the differential signal drives headphone unit, the active noise reduction controller to be operated in the active noise reduction pattern.
4. active noise reduction controller according to claim 1 or 3, which is characterized in that the system management module includes can
Programmable memory, the programmable storage store the preset default value of register, and will be described silent in system electrification
Recognize value and is packed into the register.
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| CN106028204B (en) * | 2016-07-19 | 2021-11-30 | 郑期壮 | Intelligent noise reduction earphone |
| CN106839386B (en) * | 2017-01-22 | 2020-07-03 | 会听声学科技（北京）有限公司 | Active noise reduction system and method for tower type air purifier |
| CN116741138A (en) * | 2017-03-30 | 2023-09-12 | 伯斯有限公司 | Compensation and automatic gain control in active noise reduction devices |
| CN109309895A (en) * | 2017-07-26 | 2019-02-05 | 天津大学 | An audio data stream controller system structure applied to intelligent hearing aid equipment |
| CN110876098B (en) * | 2018-08-31 | 2022-01-11 | Oppo广东移动通信有限公司 | Audio processing method and electronic equipment |
| CN110278519A (en) * | 2019-08-01 | 2019-09-24 | 华景科技无锡有限公司 | a silicon microphone |
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