CN105025418A - Active noise reduction controller - Google Patents
Active noise reduction controller Download PDFInfo
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- CN105025418A CN105025418A CN201410155861.7A CN201410155861A CN105025418A CN 105025418 A CN105025418 A CN 105025418A CN 201410155861 A CN201410155861 A CN 201410155861A CN 105025418 A CN105025418 A CN 105025418A
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Abstract
The invention discloses an active noise reduction controller which comprises a substrate, a silicon microphone, an ASIC chip integrated through an ASIC technology, and a shell. The silicon microphone and the ASIC chip are fixed to the substrate and disposed in a closed space formed by the shell and the substrate, the silicon microphone and the ASIC chip are connected in a pressure welding manner through a first group of gold wires, and the ASIC chip and the substrate are connected in a pressure welding manner through a second group of gold wires. The substrate or the shell is provided with a sound hole in a position corresponding to the silicon microphone. The substrate is further provided with a lead bonding pad comprising an earphone unit positive end bonding pad, an earphone unit negative end bonding pad, a power input end bonding pad, an audio input end bonding pad and a common grounding end bonding pad, and the lead bonding pad is connected with the second group of gold wires through a printed circuit on the substrate.
Description
Technical field
The present invention relates to earphone noise reduction field, in particular to a kind of active noise reduction controller.
Background technology
In today that electronic product is universal, earphone becomes requisite commodity in people's life.The kind of earphone is a lot, and In-Ear, wear-type is colourful, of all shapes and colors, but how effectively to reduce the common issue that outside noise impact is the impression of lifting earphone audition.The common headphones to external world obstruct of noise relies on earphone material behavior to decay to the acoustic wave energy transmitted in air, but this mode can play reasonable shielding action to the noise of several thousand more than Hz usually, still not ideal enough to the barriering effect of the low frequency noise of below hundreds of Hz.The principle of active noise reduction earphone uses headphone unit to produce and have same amplitude with extraneous noise but the contrary sound wave of phase place, disappears mutually each other, noise energy is minimized in duct with extraneous noise.In order to realize active noise reduction, need on earphone, to arrange microphone for detecting ambient noise, the position of microphone can be (detect residual noise at phonation unit towards the side of ear, corresponding to feedback-type active noise reduction), also can be in close earphone outside (testing environment noise, corresponding to feed-forward type active noise reduction).Active noise reduction earphone is when opening active noise reduction function, no matter whether there is sound to play, headphone unit is all in running order to send noise reduction sound wave, required drive singal is produced by circuit, be obtained through the process of active noise reduction circuit signal by microphone signal, and this part circuit need power supply to supply.The active noise reduction earphone of ear-shield type is at the battery of casing built with circuit board and power supply.
The phonation unit front of In-Ear Headphones (or built-in earplug) is equipped with a bit of conduit, and on conduit, cover has colloid chock plug, and during use, chock plug is filled in duct mouth and fits with duct, and the seal of earphone is improved.This profile and structural design not only compact volume and convenience, and improve the obstructing capacity to external noise, become the first-selection of miniaturized active noise reduction earphone.In-Ear active noise reduction earphone, on the basis of common In-Ear Headphones, adds the microphone detecting noise in external noise or duct.Because In-Ear Headphones volume is little, the cavity volume inserted in the later earphone of microphone is less, the signal processing circuit board that space active noise reduction cannot be provided to need and to the battery of circuit supply, so In-Ear active noise reduction earphone on the market also has a wire-controlled apparatus on earphone cord, this wire-controlled apparatus contains active noise reduction circuit and battery.The ear noise-reducing headphone of current main flow, adopts Dolby circuit to be arranged in the mode of earphone external body.The general 3.5mm stereo audio input plug of this structure compatible, relax the volume requirement of Dolby circuit, but cost is higher, reduces portability, and have passed through longer line from earphone body to Dolby circuit due to microphone, make microphone signal easily be interfered and produce noise.
As, China Patent Publication No. is the utility model patent of CN201947421U, provide a kind of ear noise-reducing headphone, this earphone is built-in with a housing at ear casing, housing has been installed the transducer (i.e. microphone) of earphone phonation unit and testing environment noise.Such module assembling mode simplifies the design of earphone, but housing wherein and transducer still occupy space more in earphone body, and operatic tunes volume reduces.The more important thing is, the control circuit of active noise reduction still needs external.
For another example, China Patent Publication No. is earphone and the drive circuit thereof of a kind of stress release treatment of patent of invention of CN102137319A, disclose a kind of use SOC(System On a Chip, system single chip) the active noise reduction earphone drive circuit of technology, by active noise reduction function i ntegration in one chip, simplify wiring and active noise reduction circuit can be placed in ear casing.But this chip pin is more, need to be welded together with peripheral cell on circuit boards, this circuit board certainly will need to occupy considerable part space in ear casing.Because in ear casing, residual volume is very little after laying microphone, under the condition not affecting earphone outward appearance, be difficult to the circuit described in holding, and this SOC is realized by analog form, setting parameter relies on peripheral cell to be connected adjustment with pin, and debug process is loaded down with trivial details.In the realization of this scheme, three assemblings of part in small size casing of microphone, circuit board and headphone unit are complicated, take the low frequency characteristic that too much cavity volume also affects playback.
Summary of the invention
The invention provides a kind of active noise reduction controller, for In-Ear Headphones to realize the active noise reduction of low cost, and do not need the contour structures changing earphone, easy to use.
For achieving the above object, the invention provides a kind of active noise reduction controller, comprise substrate, silicon microphone, by ASIC(Application Specific Integrated Circuit, application-specific integrated circuit (ASIC)) asic chip of Integration ofTechnology and shell, wherein:
Described substrate is provided with printed circuit; Described silicon microphone and described asic chip are fixed on the substrate and are positioned at the enclosure space that described shell and described substrate formed, and connected by first group of gold thread pressure welding between described silicon microphone and described asic chip, described asic chip is connected by second group of gold thread pressure welding with described substrate;
On described substrate or described shell, the position relative with described silicon microphone is provided with acoustic aperture, to be gathered and convert analog electrical signal to make ambient noise by described acoustic aperture by described silicon microphone;
Described substrate is also provided with lead pad, described lead pad comprises headphone unit anode pad, headphone unit negative terminal pad, power input pad, audio input end pad and common ground end pad, described headphone unit anode pad, described headphone unit negative terminal pad, described audio input end pad, described power input pad and described common ground end pad respectively by the printed circuit on described substrate and described second group of gold thread be connected to described asic chip earphone drive positive pin, earphone drives negative pin, audio frequency input pin, power input pin and publicly pin.
Wherein, described asic chip is integrated with the preamplifier circuit for microphone connected successively, A/D change-over circuit, digital signal processing circuit, D/A change-over circuit, audio signal hybrid circuit, differential drive circuit, first analog switch and the second analog switch, wherein, described preamplifier circuit for microphone receives the analog electrical signal of described silicon microphone output and carries out amplification process to this analog electrical signal, and pass to described A/D change-over circuit by through the analog electrical signal amplified after process, described A/D change-over circuit converts the analog electrical signal of reception to digital electric signal and is passed to described digital signal processing circuit, described digital signal processing circuit sends into described D/A change-over circuit after described digital electric signal is carried out filtering process, digital electric signal after filtering process is reduced into analog electrical signal by described D/A change-over circuit, analog electrical signal through described D/A change-over circuit reduction enters described audio signal hybrid circuit, described audio signal hybrid circuit exports described differential drive circuit to after it being superposed with the audio signal come by the transmission of audio frequency input pin, mixed signal after superposition is transformed into differential signal and Buffer output by described differential drive circuit, the anode of described differential signal connects the first analog switch, the negative terminal of described differential signal connects described second analog switch.
Wherein said digital signal processing circuit comprises the combination of 5 ~ 10 single orders or second order IIR filter, the coefficient of the iir filter described in 3 ~ 6 wherein passes through register configuration, thus the frequency response of whole digital signal processing circuit is regulated by register, to coordinate, there is the earphone system of different frequency response characteristic, realize sound wave that digital electric signal finally changes sound wave and the ambient noise exported by described headphone unit into and meet equal and opposite in direction, relation that phase place is contrary.
Wherein, described first analog switch and described second analog switch Dou Wei No. bis-selector switch, and described first analog switch and described second analog switch synchronism switching, two road inputs of described first analog switch connect the anode of described differential signal and described audio frequency input pin respectively, the output of described first analog switch connects described earphone and drives positive pin, realize the switching that described earphone drives positive pin to be connected with anode or the described audio signal input end of described differential signal, two road inputs of described second analog switch connect the negative terminal of described differential signal and described pin publicly respectively, the output of described second analog switch connects described earphone and drives negative pin, realize the switching that described earphone drives negative pin to link with negative terminal or the described common ground end of described differential signal, when the anode that described first analog switch switches to described differential signal drives positive pin to be connected with described earphone, described second analog switch synchronism switching drives negative pin to be connected to the negative terminal of described differential signal with described earphone, described differential signal drives headphone unit, described active noise reduction controller produces the de-noising signal of offsetting ambient noise, be operated in active noise reduction pattern, when described first analog switch switch to described audio signal input end drive positive pin to be connected with described earphone time, described second analog switch synchronism switching to described pin publicly and described earphone drives negative pin to be connected, now, the described preamplifier circuit for microphone of described asic chip, described A/D change-over circuit, described digital signal processing circuit, described D/A change-over circuit, described audio signal hybrid circuit and described differential drive circuit are closed, the audio signal Direct driver headphone unit come by the transmission of described audio frequency input pin, described earphone active noise reduction controller does not produce the de-noising signal of offsetting ambient noise, be operated in direct mode operation.
Wherein, described asic chip is also integrated with power supply monitoring module and system management module, described power supply monitoring module is for monitoring the voltage of described power input, described system management module comprises programmable storage, described programmable storage stores the default value of described register, and when system electrification, described default value is loaded described register, when described power supply monitoring module monitors to the voltage of described power input lower than the voltage threshold of between the 1.6V ~ 2.1V preset time, described first analog switch is switched to described audio signal input end and drives positive pin to be connected with described earphone by described system management module, negative pin is driven to be connected on described second analog switch synchronism switching to described pin publicly and described earphone, by input audio signal Direct driver headphone unit, simultaneously, described preamplifier circuit for microphone, A/D change-over circuit, digital signal processing circuit, D/A change-over circuit, audio signal hybrid circuit, differential drive circuit is all in closed condition, described active noise reduction controller is operated in described direct mode operation, when described power supply monitoring module monitors to the voltage of described power input higher than this voltage threshold time, the anode that described first analog switch is switched to described differential signal by described system management module drives positive pin to be connected with described earphone, described second analog switch synchronism switching to negative terminal and the described earphone of described differential signal is driven and bears pin and be connected, described differential signal drives headphone unit, described active noise reduction controller is operated in described active noise reduction pattern, and all circuit function modules on described asic chip normally work.
Compared with prior art, beneficial effect of the present invention is embodied in:
Active noise reduction controller of the present invention, adopt silicon microphone and pass through the integrated asic chip of asic technology, volume is less, can directly implant existing earphone and not need to change earphone contour structures, easy-to-use; Adopt digital processing circuit to change the phase place of signal and amplitude, more accurately, debug more convenient, and utilize the combination of multiple single order or second order IIR filter, can environmentally with noise reduction demand flexible design, very convenient; Pin is less, simple and practical; Control selectable two kinds of mode of operations by supply voltage mutually to switch, implement active noise reduction when needs noise reduction, by input signal Direct driver earphone when not needing noise reduction, Dolby circuit is closed and controller is in extremely low power dissipation state.
Accompanying drawing explanation
Fig. 1 is the structural representation of the active noise reduction controller of one embodiment of the invention;
Fig. 2 is the structural representation of the asic chip of the active noise reduction controller of one embodiment of the invention;
Fig. 3 is the schematic diagram that the active noise reduction controller of one embodiment of the invention is applied in In-Ear Headphones.
Description of reference numerals: 101-substrate; 102-acoustic aperture; 103-lead pad; 104 silicon microphones; 105-ASIC chip; 106-shell; 107-first group of gold thread; 108-second group of gold thread; 201-preamplifier circuit for microphone; 202-A/D change-over circuit; 203-digital signal processing circuit; 204-D/A change-over circuit; 205-audio signal hybrid circuit; 206-differential drive circuit; 207-first analog switch; 208-second analog switch; 301-earphone case; 302-earphone silica gel sheath; 303-headphone unit; 304-active noise reduction controller; 305-earphone Air Filter; 306-earphone cord; 307-first connecting line; 308-second connecting line.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, Fig. 1 is the structural representation of the active noise reduction controller of one embodiment of the invention.As shown in Figure 1, a kind of active noise reduction controller provided by the invention, comprise substrate 101, silicon microphone 104, by the integrated asic chip 105 of asic technology and shell 106.Wherein, substrate 101 is printed circuit board (PCB).During enforcement; silicon microphone 104 and asic chip 105 are fixed on the substrate 101; shell 106 and substrate 101 form closed cavity; silicon microphone 104 and asic chip 105 are closed to protect it to damage from the external world by this closed cavity; simultaneously; substrate 101 has an opening and acoustic aperture 102 with silicon microphone 104 correspondence position, is gathered by silicon microphone 104 by acoustic aperture 102 to make ambient noise.During enforcement, acoustic aperture 102 can also be arranged on position corresponding with silicon microphone 104 on shell 106.Connected by first group of gold thread 107 between silicon microphone 104 and asic chip 105, wherein first group of gold thread 107 comprises microphone signal, microphone bias voltage and microphone ground, is changed in order to transmit silicon microphone 104 analog electrical signal come by ambient noise.Be connected by second group of gold thread 108 between asic chip 105 with substrate 101, second group of gold thread 108 at least comprises power supply input, audio signal input, publicly, earphone is just driving and earphone drives negative.Part outside the enclosure space that substrate 101 is formed with shell 106 is provided with lead pad 103, and the part pin of asic chip 105 causes lead pad 103 by the printed circuit in second group of gold thread 108 and substrate 101.In one embodiment of the invention, lead pad 103 comprises headphone unit anode pad SPK+, headphone unit negative terminal pad SPK-, power input pad VDD, audio input end pad AIN and common ground end pad GND.
Refer to Fig. 2, Fig. 2 is the structural representation of the asic chip of the active noise reduction controller of one embodiment of the invention.As shown in Figure 2, in the asic chip of active noise reduction controller of the present invention, be integrated with the preamplifier circuit for microphone 201, A/D change-over circuit 202, digital signal processing circuit 203, D/A change-over circuit 204, audio signal hybrid circuit 205, differential drive circuit 206, first analog switch 207 and the second analog switch 208 that connect successively.The microphone signal (analog electrical signal) that preamplifier circuit for microphone 201 exports for receiving silicon microphone 104, and carry out amplification process; A/D change-over circuit 202 converts digital electric signal to for the analog electrical signal after being amplified by preamplifier circuit for microphone 201; Digital signal processing circuit 203, for the treatment of digital electric signal, comprises adjusting amplitude and phase place; D/A change-over circuit 204 is for again converting the digital signal after frequency equilibrium to analog electrical signal for noise reduction; Audio signal hybrid circuit 205 superposes with the analog electrical signal being used for noise reduction for the audio signal inputted by audio frequency apparatus; Differential drive circuit 206 drives the differential signal of headphone unit for being become by mixed analog electrical signal, and is connected to headphone unit respectively through the first analog switch 207, second analog switch 208.
During concrete enforcement, noise signal enters active noise reduction controller by acoustic aperture 102, received by silicon microphone 104, noise sound wave is converted to analog electrical signal and is connected to asic chip 105 by first group of gold thread 107 by silicon microphone 104, the preamplifier circuit for microphone 201 of asic chip 105 receives this analog electrical signal and carries out passing to A/D change-over circuit 202 after amplification processes, A/D change-over circuit 202 converts this analog electrical signal to digital electric signal and passes to digital signal processing circuit 203, digital signal processing circuit 203 regulates amplitude and the phase place of this digital signal, it is made to be transformed into digital electric signal for offset noise, D/A change-over circuit 204 receives the digital electric signal the analog electrical signal converted to for offset noise that are used for offset noise, is passed to audio signal hybrid circuit 205, audio signal hybrid circuit 205 also obtains the audio signal of audio frequency apparatus input while obtaining the analog electrical signal being used for offset noise, two kinds of analog signals superpose by audio signal hybrid circuit 205, and by the analog signal transmission after superposition to differential drive circuit 206, differential drive circuit 206, by the analog electrical signal buffering after superposition, becomes and drives the differential signal of headphone unit, and drives headphone unit to export sound wave by the control connection of the first analog switch 207, second analog switch 208.The sound wave that headphone unit exports meets with noise sound wave and automatically superposes, and comprises equal with noise sound wave amplitude, that phase place is contrary sound wave, can disappear mutually, reach the effect of noise reduction thus with noise sound wave after meeting because of in the sound wave that headphone unit exports.
During concrete enforcement, digital signal processing circuit 203 is the keys obtaining de-noising signal, in the present embodiment, digital signal processing circuit 203 comprises the combination of 5 ~ 10 single orders or second order IIR filter, in order to carry out filtering process to described digital electric signal, regulate amplitude and the phase place of digital electric signal, the frequency response of 3 ~ 6 iir filters is wherein changed by register, use to coordinate the earphone system with different frequency response characteristic, the sound wave exported by described headphone unit that this digital electric signal is finally converted into and the sound wave of ambient noise have equal and opposite in direction, the relation that phase place is contrary.During concrete enforcement, the combination of 5 ~ 10 single orders or second order IIR filter draws by calculating in a large number and testing, and then can not meet noise reduction requirement lower than 5, higher than 10 then to noise reduction not larger lifting.During specific design, the number of single order or second order IIR filter adjusts according to actual noise reduction demand, and General Second Order iir filter has abundanter frequency response characteristic, but is not easy to regulate.3 ~ 6 are had to adopt variable coefficient in the combination of 5 ~ 10 single orders or second order IIR filter, this coefficient is changed by register, all the other adopt fixed coefficient, both ensure that in design process and ensured that as far as possible few iir filter regulated number, and can meet again by regulating the coefficient of these iir filters thus meeting the noise reduction demand of different frequency characteristic earphone.Wherein, the design consideration signal path of iir filter need the amplitude of carrying out different frequency and phase compensation determine, in actual design, audio detection device is needed to carry out determination and analysis to the frequency response of earphone and earphone to the attenuation characteristic of ambient noise, according to the best value of the coefficient of the iir filter of variable coefficient in Analysis result calculation digital filter, be defined as preset value or design load, be default value.
During concrete enforcement, asic chip 105 is also integrated with power supply monitoring module and system management module, described power supply monitoring module is for monitoring the voltage of active noise reduction controller, described system management module comprises programmable storage, the default value of the register storing iir filter coefficient preserved by described programmable storage, and when system electrification, described default value is loaded corresponding registers, there is a voltage threshold asic chip inside, this voltage threshold is a fixed value of 1.6V ~ 2.1V, when described power supply monitoring module monitors to the voltage of active noise reduction controller lower than this voltage threshold time, described earphone active noise reduction controller is operated in described direct mode operation, when described power supply monitoring module monitors to the voltage of active noise reduction controller higher than this voltage threshold time, described earphone active noise reduction controller is operated in described active noise reduction pattern.
During concrete enforcement, the direct mode operation of active noise reduction controller and active noise reduction pattern are realized by the first analog switch 207 and the second analog switch 208.As shown in Figure 2, first analog switch 207 and second analog switch 208 Dou Wei No. bis-selector switch, and the first analog switch 207 and the second analog switch 208 synchronism switching are selected, two road inputs of the first analog switch 207 connect the anode of described differential signal and described audio frequency input pin respectively, the output of described first analog switch connects described earphone and drives positive pin, realize switching between the anode of the differential signal that described earphone drives positive pin and differential drive circuit 206 to export and audio signal input end, two road inputs of the second analog switch 208 connect the negative terminal of described differential signal and described pin publicly respectively, the output of described second analog switch connects described earphone and drives negative pin, realize switching between the negative terminal of the differential signal that described earphone drives negative pin and differential drive circuit 206 to export and common ground end, when described power supply monitoring module monitors to active noise reduction controller voltage higher than setting voltage threshold time, the anode that first analog switch 207 switches to the differential signal that differential drive circuit 206 exports drives positive pin to be connected with described earphone, negative terminal and the described earphone of the differential signal that the second analog switch 208 synchronism switching exports to differential drive circuit 206 drive negative pin to be connected, active noise reduction controller produces the de-noising signal of offsetting ambient noise, be operated in active noise reduction pattern, when described power supply monitoring module monitors to the voltage of active noise reduction controller lower than this voltage threshold time, first analog switch 207 switches to audio signal input end and drives positive pin to be connected with described earphone, described second analog switch 208 synchronism switching to common ground end and described earphone drives negative pin to be connected, now, the preamplifier circuit for microphone 201 of asic chip 105, A/D change-over circuit 202, digital signal processing circuit 203, D/A change-over circuit 204, audio signal hybrid circuit 205 and differential drive circuit 206 are closed, described earphone active noise reduction controller does not produce the de-noising signal of offsetting ambient noise, be operated in direct mode operation.
Refer to Fig. 3, Fig. 3 is the schematic diagram that the active noise reduction controller of one embodiment of the invention is applied in In-Ear Headphones.As shown in Figure 3, active noise reduction controller 304 of the present invention is installed in the cavity in earphone case 301 after headphone unit 303 in In-Ear Headphones, only occupy the space being far smaller than headphone unit 303, lead pad 103 number of pads of active noise reduction controller 304 is few, and wiring is also very easy.Earphone cord 306 comprises three wires: power positive end line, audio signal input line and common ground, and three wires i.e. the second connecting line 308 is power input pad VDD, the audio input end pad AIN of connecting lead wire pad 103 and described common ground end pad GND respectively.The headphone unit anode pad SPK+ of lead pad 103 and headphone unit negative terminal pad SPK-are connected with the anode of headphone unit, negative terminal respectively by the first connecting line 307.
During concrete enforcement, earphone silica gel sheath 302 puts into user's ear, noise sound wave enters in active noise reduction controller 304 by earphone Air Filter 305, noise sound wave is through the process of active noise reduction controller 304, and export difference drive singal after it being mixed with the audio signal inputted by the second connecting line 308, and transfer to headphone unit 303 by the first connecting line 307, this differential driving signal is transformed into voice signal and exports by headphone unit 303, the sound wave of the voice signal exported superposes mutually with noise sound wave, the sound wave that the audio signal only having audio frequency apparatus to transmit after balancing out noise section converts to enters the ear of user, thus realize noise reduction.
One of ordinary skill in the art will appreciate that: the module in the device in embodiment can describe according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (6)
1. an active noise reduction controller, is characterized in that, comprise substrate, silicon microphone, by the integrated asic chip of asic technology and shell, wherein:
Described silicon microphone and described asic chip are fixed on the substrate and are positioned at the enclosure space that described shell and described substrate formed, and connected by first group of gold thread pressure welding between described silicon microphone and described asic chip, described asic chip is connected by second group of gold thread pressure welding with described substrate;
On described substrate or described shell, the position relative with described silicon microphone is provided with acoustic aperture, to be gathered and convert analog electrical signal to make ambient noise by described acoustic aperture by described silicon microphone;
Described substrate is also provided with lead pad, described lead pad comprises headphone unit anode pad, headphone unit negative terminal pad, power input pad, audio input end pad and common ground end pad, described headphone unit anode pad, described headphone unit negative terminal pad, described audio input end pad, the earphone that described power input pad and described common ground end pad are connected to described asic chip respectively by the printed wire in described substrate and described second group of gold thread drives positive pin, earphone drives negative pin, audio frequency input pin, power input pin and publicly pin.
2. active noise reduction controller according to claim 1, it is characterized in that, described asic chip is integrated with the preamplifier circuit for microphone connected successively, A/D change-over circuit, digital signal processing circuit, D/A change-over circuit, audio signal hybrid circuit, differential drive circuit, wherein, described preamplifier circuit for microphone receives the analog electrical signal from described silicon microphone and carries out amplification process to this analog electrical signal, and pass to described A/D change-over circuit by through the analog electrical signal amplified after process, described A/D change-over circuit converts analog electrical signal to digital electric signal and is passed to described digital signal processing circuit, described digital signal processing circuit sends into described D/A change-over circuit after described digital electric signal is carried out filtering process, digital electric signal after filtering process is reduced into analog electrical signal by described D/A change-over circuit, analog electrical signal through described D/A change-over circuit reduction enters described audio signal hybrid circuit, described audio signal hybrid circuit exports described differential drive circuit to after it being superposed with the audio signal come by the transmission of described audio frequency input pin, described differential drive circuit by superposition after mixed signal be transformed into differential signal and Buffer output to drive headphone unit.
3. active noise reduction controller according to claim 2, it is characterized in that, described digital signal processing circuit comprises the combination of 5 ~ 10 single orders or second order IIR filter, the coefficient of the iir filter described in 3 ~ 6 wherein passes through register configuration, thus the frequency response of whole digital signal processing circuit is regulated by register, to coordinate, there is the earphone system of different frequency response characteristic, realize sound wave that digital electric signal finally changes sound wave and the ambient noise exported by described headphone unit into and meet equal and opposite in direction, relation that phase place is contrary.
4. active noise reduction controller according to claim 2, it is characterized in that, described asic chip is also provided with the first analog switch and the second analog switch, described first analog switch and described second analog switch Dou Wei No. bis-selector switch, and described first analog switch and described second analog switch synchronism switching are selected, two road inputs of described first analog switch connect the anode of described differential signal and described audio frequency input pin respectively, the output of described first analog switch connects described earphone and drives positive pin, realize the switching that described earphone drives positive pin to be connected with anode or the described audio signal input end of described differential signal, two road inputs of described second analog switch connect the negative terminal of described differential signal and described pin publicly respectively, the output of described second analog switch connects described earphone and drives negative pin, realize the switching that described earphone drives negative pin to be connected with negative terminal or the described pin publicly of described differential signal, when the anode that described first analog switch switches to described differential signal drives positive pin to be connected with described earphone, described second analog switch synchronism switching drives negative pin to be connected to the negative terminal of described differential signal with described earphone, described differential signal drives headphone unit, the de-noising signal of described active noise reduction controller output offset ambient noise, be operated in active noise reduction pattern, when described first analog switch switch to described audio signal input end drive positive pin to be connected with described earphone time, described second analog switch synchronism switching to described pin publicly and described earphone drives negative pin to be connected, the audio signal Direct driver headphone unit come by the transmission of described audio frequency input pin, described active noise reduction controller is operated in direct mode operation.
5. active noise reduction controller according to claim 4, it is characterized in that, described asic chip is also integrated with power supply monitoring module and system management module, described power supply monitoring module is for monitoring the voltage of described power input, when described power supply monitoring module monitors to the voltage of described power input lower than the voltage threshold of between the 1.6V ~ 2.1V preset time, described first analog switch is switched to described audio signal input end and drives positive pin to be connected with described earphone by described system management module, negative pin is driven to be connected on described second analog switch synchronism switching to described pin publicly and described earphone, and by described preamplifier circuit for microphone, described A/D change-over circuit, described digital signal processing circuit, described D/A change-over circuit, described audio signal hybrid circuit and described differential drive circuit are closed, the audio signal Direct driver headphone unit that the transmission of described audio frequency input pin comes, described active noise reduction controller is operated in described direct mode operation, when described power supply monitoring module monitors to the voltage of described power input higher than this voltage threshold time, described system management module is by described preamplifier circuit for microphone, described A/D change-over circuit, described digital signal processing circuit, described D/A change-over circuit, described audio signal hybrid circuit and described differential drive circuit are opened, the anode described first analog switch being switched to described differential signal drives positive pin to be connected with described earphone, described second analog switch synchronism switching to negative terminal and the described earphone of described differential signal is driven and bears pin and be connected, described differential signal drives headphone unit, described active noise reduction controller is operated in described active noise reduction pattern.
6. the active noise reduction controller according to claim 3 and 5, it is characterized in that, described system management module comprises programmable storage, and described programmable storage stores the default value that described register is preset, and when system electrification, described default value is loaded described register.
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Cited By (6)
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| CN106028204A (en) * | 2016-07-19 | 2016-10-12 | 华峰君 | Intelligent noise reduction earphone |
| CN106839386A (en) * | 2017-01-22 | 2017-06-13 | 会听声学科技（北京）有限公司 | A kind of active noise reduction system and method for tower air cleaner |
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