CN203840513U - Active noise reduction controller - Google Patents
Active noise reduction controller Download PDFInfo
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- CN203840513U CN203840513U CN201420188342.6U CN201420188342U CN203840513U CN 203840513 U CN203840513 U CN 203840513U CN 201420188342 U CN201420188342 U CN 201420188342U CN 203840513 U CN203840513 U CN 203840513U
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Abstract
The utility model provides an active noise reduction controller, which comprises a substrate, a silicon microphone, an ASIC (Application Specific Integrated Circuit) chip integrated through an ASIC technology and a shell, wherein the silicon microphone and the ASIC chip are fixed on the substrate and located 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; and the substrate or the shell is provided with a sound hole at a position corresponding to the silicon microphone, the substrate is further provided with a lead bonding pad, the lead bonding pad comprises 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 utility model relates to earphone noise reduction field, in particular to a kind of active noise reduction controller.
Background technology
In electronic product universal today, 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, is a common issue that promotes the impression of earphone audition but how effectively to reduce outside noise impact.The common headphones to external world obstruct of noise is to rely on earphone material behavior to decay to the acoustic wave energy transmitting in air, but this mode can play reasonable shielding action to noises more than several thousand Hz conventionally, still not ideal enough to the barriering effect of the low frequency noise below hundreds of Hz.The principle of active noise reduction earphone is to use headphone unit generation to have same amplitude but the sound wave of single spin-echo with extraneous noise, in duct, disappears mutually each other with external noise, and noise energy is minimized.In order to realize active noise reduction, need to microphone be set on earphone for detection of ambient noise, the position of microphone can be (to detect residual noise at phonation unit towards a 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 in the time opening active noise reduction function, no matter whether having sound plays, headphone unit is all in running order to send noise reduction sound wave, required driving signal is produced by circuit, be to process and obtain through active noise reduction circuit signal by microphone signal, and this part circuit need power supply to supply with.The active noise reduction earphone of ear-shield type is equipped with the battery of circuit board and power supply use in casing.
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 when use, chock plug is filled in duct mouth and fits with duct, and the seal of earphone is improved.Not only compact volume and convenience of this profile and structural design, and improved the obstructing capacity to external noise, become the first-selection of miniaturization active noise reduction earphone.In-Ear active noise reduction earphone, on the basis of common In-Ear Headphones, has increased the microphone that detects noise in external noise or duct.Because In-Ear Headphones volume is little, insert after microphone the cavity volume in earphone less, cannot provide space to hold the signal processing circuit board of active noise reduction needs and the battery to 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 has comprised active noise reduction circuit and battery.The ear noise-reducing headphone of main flow at present, adopts Dolby circuit to be arranged in the mode of earphone external body.This structure compatible general 3.5mm stereo audio input plug, relaxed the volume requirement of Dolby circuit, but cost is higher, has reduced portability, and because microphone has passed through longer line from earphone body to Dolby circuit, make microphone signal easily be interfered and produce noise.
As, China Patent Publication No. is the utility model patent of CN201947421U, a kind of ear noise-reducing headphone is provided, and this earphone is built-in with a housing at ear casing, and the transducer (being microphone) of earphone phonation unit and testing environment noise has been installed on housing.Such module assembling mode has been simplified the design of earphone, but housing wherein and transducer have still occupied more space 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 a kind of earphone and drive circuit thereof of eliminating noise of the utility model patent of CN102137319A, a kind of use SOC(System On a Chip is disclosed, system single chip) the active noise reduction earphone drive circuit of technology, active noise reduction function is integrated in one chip, has simplified wiring 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 board, this circuit board certainly will need to occupy considerable part space in ear casing.Because the interior residual volume of ear casing is very little after laying microphone, under the condition that does not affect earphone outward appearance, be difficult to hold described circuit, and this SOC chip 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, microphone, circuit board and the assembling complexity of headphone unit three parts in small size casing, taking too much cavity volume also affects the low frequency characteristic of playback.
Utility model content
The utility model provides a kind of active noise reduction controller, to realize active noise reduction cheaply, and does not need to change the contour structures of earphone for In-Ear Headphones, easy to use.
For achieving the above object, the utility model provides a kind of active noise reduction controller, comprise substrate, silicon microphone, pass through ASIC(Application Specific Integrated Circuit, application-specific integrated circuit (ASIC)) integrated asic chip and the shell of technology, wherein:
Described substrate is provided with printed circuit; Described silicon microphone and described asic chip are fixed on described substrate and are positioned at described shell and the enclosure space of described substrate formation, and between described silicon microphone and described asic chip, connect by first group of gold thread pressure welding, 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 sound hole, so that ambient noise is gathered and convert to analog electrical signal by described sound hole by described silicon microphone;
On described substrate, be 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 supply input pin and publicly pin.
Wherein, described asic chip is integrated with the preamplifier circuit for microphone connecting successively, A/D change-over circuit, digital signal processing circuit, D/A change-over circuit, audio signal hybrid circuit, differential drive circuit, the 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 this analog electrical signal is amplified to processing, and will pass to described A/D change-over circuit through amplifying analog electrical signal after treatment, described A/D change-over circuit converts the analog electrical signal of reception digital electric signal to and is passed to described digital signal processing circuit, described digital signal processing circuit carries out described digital electric signal to send into described D/A change-over circuit after filtering processing, digital electric signal after treatment filtering 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 itself and the audio signal of being come by the transmission of audio frequency input pin are superposeed, the mixed signal after stack is transformed into differential signal 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 the second analog switch.
Wherein, 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 wherein 3～6 leaves in programmable storage, thereby the parameter of whole digital signal processing circuit can be preset for the earphone system with different frequency response, realize sound wave that digital electric signal finally changes the sound wave exported by described headphone unit and ambient noise into and meet the relation of equal and opposite in direction, single spin-echo.
Wherein, described the first analog switch and described second analog switch Dou Wei No. bis-selector switches, and described the first analog switch and described the second analog switch synchronously switch, described the first analog switch Er road input connects respectively anode and the described audio frequency input pin of described differential signal, the output of described the 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, described the second analog switch Er road input connects respectively negative terminal and the described pin publicly of described differential signal, the output of described the second analog switch connects described earphone and drives negative pin, realize the switching that described earphone drives negative pin and negative terminal or the described common ground end of described differential signal to link, when the anode that switches to described differential signal when described the first analog switch drives positive pin to be connected with described earphone, the negative terminal that described the second analog switch synchronously switches to described differential signal drives negative pin to be connected 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, in the time that described the first analog switch switches to described audio signal input end and drives positive pin to be connected with described earphone, described in described the second analog switch synchronously switches to, pin drives negative pin to be connected with described earphone publicly, the audio signal of being come by the transmission of described audio frequency input pin directly drives headphone unit, described earphone active noise reduction controller does not produce the de-noising signal of offsetting ambient noise, is operated in direct mode operation.
Wherein, on described asic chip, also comprise mode control circuit, described mode control circuit comprises a voltage comparator, the logic level output of this voltage comparator is as the output of described mode control circuit, this voltage comparator compares the voltage of described power input and threshold voltage, when the voltage of described power input is during higher than described threshold voltage, described mode control circuit output logic high level, when the voltage of described power input is during lower than described threshold voltage, described mode control circuit output logic low level, be used for controlling described the first analog switch, the switching of the second analog switch is selected, and described preamplifier circuit for microphone, described A/D change-over circuit, described digital signal processing circuit, described D/A change-over circuit, the open and close of described audio signal hybrid circuit and described differential drive circuit, in the time of described mode control circuit output logic high level, 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 that described the first analog switch switches to described differential signal drives positive pin to be connected with described earphone, the negative terminal that described the second analog switch synchronously switches to described differential signal drives negative pin to be connected with described earphone, described active noise reduction controller is operated in described active noise reduction pattern, in the time of mode control circuit output logic low level, described the first analog switch switches to described audio signal input end and drives positive pin to be connected with described earphone, described in described the second analog switch synchronously switches to, pin drives negative pin to be connected with described earphone publicly, 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, and described active noise reduction controller is operated in described direct mode operation.Wherein, threshold voltage is a reference voltage between 1.6V～2.1V.
Compared with prior art, the beneficial effects of the utility model are embodied in:
Active noise reduction controller of the present utility model, adopts silicon microphone and by the integrated asic chip of asic technology, volume is less, can directly implant existing earphone and does not need to change earphone contour structures, easy-to-use; Adopt digital processing circuit to change phase place and the amplitude of signal, more accurate, debug more conveniently, and utilize the combination of multiple single orders or second order iir filter, can be according to environment and noise reduction demand flexible design, very convenient; Pin is less, simple and practical; Two kinds of mode of operations are switched mutually, in the time of needs noise reduction, implement active noise reduction, while not needing noise reduction, directly drive earphone by input signal, Dolby circuit close and controller in extremely low power dissipation state.
Brief description of the drawings
Fig. 1 is the structural representation of the active noise reduction controller of the utility model one embodiment;
Fig. 2 is the structural representation of the asic chip of the active noise reduction controller of the utility model one embodiment;
Fig. 3 is the schematic diagram that the active noise reduction controller of the utility model one embodiment is applied in In-Ear Headphones.
Description of reference numerals: 101-substrate; 102-sound hole; 103-lead pad; 104 silicon microphones; 105-ASIC chip; 106-shell; First group of gold thread of 107-; Second group of gold thread of 108-; 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-the first analog switch; 208-the 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-the first connecting line; 308-the second connecting line.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not paying the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, Fig. 1 is the structural representation of the active noise reduction controller of an embodiment of the utility model.As shown in Figure 1, a kind of active noise reduction controller that the utility model provides, comprises substrate 101, silicon microphone 104, passes through integrated asic chip 105 and the shell 106 of asic technology.Wherein, substrate 101 is printed circuit board (PCB).When enforcement; silicon microphone 104 and asic chip 105 are fixed on substrate 101; shell 106 and substrate 101 form closed cavity; this closed cavity is closed to protect it to avoid extraneous damage silicon microphone 104 and asic chip 105; simultaneously; on substrate 101, having an opening with silicon microphone 104 correspondence positions is sound hole 102, so that ambient noise is gathered by silicon microphone 104 by sound hole 102.When enforcement, sound hole 102 can also be arranged on position corresponding with silicon microphone 104 on shell 106.Between silicon microphone 104 and asic chip 105, connect by first group of gold thread 107, wherein first group of gold thread 107 comprises microphone signal, microphone bias voltage and microphone ground, changed in order to transmit silicon microphone 104 analog electrical signal coming by ambient noise.Between asic chip 105 and substrate 101, be connected by second group of gold thread 108, second group of gold thread 108 at least comprise power supply input, audio signal input, publicly, earphone is just driving and earphone drives negative.Part outside the enclosure space forming with shell 106 on substrate 101 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 an embodiment of the present utility model, 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 the utility model one embodiment.As shown in Figure 2, in the asic chip of active noise reduction controller of the present utility model, 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, the 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 is exported for receiving silicon microphone 104, and amplify processing; A/D change-over circuit 202 converts digital electric signal to for the analog electrical signal after preamplifier circuit for microphone 201 is amplified; 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 for by the audio signal of audio frequency apparatus input with superpose for the analog electrical signal of noise reduction; Differential drive circuit 206 drives the differential signal of headphone unit for mixed analog electrical signal is become, and is connected to headphone unit through the first analog switch 207, the second analog switch 208 respectively.
When concrete enforcement, noise signal enters active noise reduction controller by sound hole 102, received by silicon microphone 104, silicon microphone 104 converts noise sound wave to analog electrical signal and is connected to asic chip 105 by first group of gold thread 107, the preamplifier circuit for microphone 201 of asic chip 105 passes to A/D change-over circuit 202 after receiving this analog electrical signal and amplifying processing, 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, make it be transformed into the digital electric signal for offset noise, D/A change-over circuit 204 receives for the digital electric signal of offset noise and converts the analog electrical signal for offset noise to, is passed to audio signal hybrid circuit 205, audio signal hybrid circuit 205 also obtains the audio signal of audio frequency apparatus input when obtaining for the analog electrical signal of offset noise, audio signal hybrid circuit 205 superposes two kinds of analog signals, and by stack after analog signal transmission to differential drive circuit 206, differential drive circuit 206, by the analog electrical signal buffering after stack, becomes the differential signal that drives headphone unit, and control connection by the first analog switch 207, the second analog switch 208 drive headphone unit output sound wave.The stack automatically of meeting of the sound wave of headphone unit output and noise sound wave, in the sound wave of exporting because of headphone unit, comprise with noise sound wave amplitude equate, the sound wave of single spin-echo, after meeting with noise sound wave, can disappear mutually, reach thus the effect of noise reduction.
When concrete enforcement, digital signal processing circuit 203 is the keys that obtain de-noising signal, in the present embodiment, the combination that digital signal processing circuit 203 comprises 5～10 single orders or second order iir filter, in order to described digital electric signal is carried out to filtering processing, regulate amplitude and the phase place of digital electric signal, the coefficient of the iir filter described in wherein 3～6 leaves in programmable storage, thereby the parameter of whole digital signal processing circuit can be preset for the earphone system with different frequency response, passing through of making that this digital electric signal the is finally converted into sound wave that described headphone unit exports and the sound wave of ambient noise have equal and opposite in direction, the relation of single spin-echo.When concrete enforcement, the combination of 5～10 single orders or second order iir filter draws by a large amount of calculating and experiment, can not meet noise reduction requirement lower than 5, higher than 10 to not larger lifting of noise reduction.When specific design, the number of single order or second order iir filter is adjusted according to actual noise reduction demand, and General Second Order iir filter has abundanter frequency response characteristic, but is not easy to regulate.In the combination of 5～10 single orders or second order iir filter, there are 3～6 and adopt variable coefficients, this coefficient changes by programmable storage, all the other adopt fixed coefficient, both ensured to ensure that the iir filter of trying one's best few regulates number in design process, thereby can meet again coefficient by regulating these iir filters and meet the noise reduction demand of different frequency characteristic earphone.Wherein, on the design consideration signal path of iir filter, need amplitude and phase compensation that different frequency is carried out to determine, in actual design, need frequency response and the earphone of audio detection device to earphone to carry out determination and analysis 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.
When concrete enforcement, on asic chip 105, be also integrated with mode control circuit, described mode control circuit comprises a voltage comparator, the logic level output of this voltage comparator is as the output of described mode control circuit, for the voltage of power input and threshold voltage are compared, this threshold voltage is the reference voltage between predefined 1.6V～2.1V, when the voltage of power input is during higher than threshold voltage, mode control circuit output logic high level, described active noise reduction controller is operated in described active noise reduction pattern; When the voltage of power input is during lower than threshold voltage, mode control circuit output logic low level, described active noise reduction controller is operated in direct mode operation.
When concrete enforcement, the direct mode operation of active noise reduction controller and active noise reduction pattern realize by the first analog switch 207 and the second analog switch 208.As shown in Figure 2, the first analog switch 207 and second analog switch 208 Dou Wei No. bis-selector switches, and the first analog switch 207 and synchronous switching of the second analog switch 208 are selected, the first analog switch 207 bis-road inputs connect respectively anode and the described audio frequency input pin of described differential signal, the output of described the first analog switch connects described earphone and drives positive pin, realizing described earphone drives between the anode of the differential signal that positive pin and differential drive circuit 206 export and audio signal input end and switches, the second analog switch 208 bis-road inputs connect respectively negative terminal and the described pin publicly of described differential signal, the output of described the second analog switch connects described earphone and drives negative pin, realizing described earphone drives between the negative terminal of the differential signal that negative pin and differential drive circuit 206 export and common ground end and switches, in the time of described mode control circuit output logic high level, the anode that the first analog switch 207 switches to the differential signal that differential drive circuit 206 exports drives positive pin to be connected with described earphone, the negative terminal that the second analog switch 208 synchronously switches to the differential signal that differential drive circuit 206 exports drives negative pin to be connected with described earphone, active noise reduction controller produces the de-noising signal of offsetting ambient noise, be operated in active noise reduction pattern, in the time of described mode control circuit output logic low level, the first analog switch 207 switches to audio signal input end and drives positive pin to be connected with described earphone, described the second analog switch 208 synchronously switches to common ground end and drives negative pin to be connected with described earphone, simultaneously, 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 the utility model one embodiment is applied in In-Ear Headphones.As shown in Figure 3, active noise reduction controller 304 of the present utility model is installed in headphone unit in earphone case 301 303 cavity below in In-Ear Headphones, only occupy the space that is far smaller than headphone unit 303, lead pad 103 number of pads of active noise reduction controller 304 are few, and wiring is also very easy.Earphone cord 306 comprises three wires: power positive end line, audio signal input line and common ground, three i.e. the second connecting line 308 power input pad VDD, audio input end pad AIN and described common ground end pad GND of connecting lead wire pad 103 respectively of wire.The headphone unit anode pad SPK+ of lead pad 103 is connected with anode, the negative terminal of headphone unit respectively by the first connecting line 307 with headphone unit negative terminal pad SPK-.
When concrete enforcement, earphone silica gel sheath 302 is put 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 processing of active noise reduction controller 304, and output differential driving signal after it is mixed with the audio signal of being 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 output by headphone unit 303, sound wave and the noise sound wave of the voice signal of output superpose mutually, balance out and only have after noise section the sound wave that audio signal that audio frequency apparatus transmits converts to enter user's ear, thereby realize noise reduction.
One of ordinary skill in the art will appreciate that: the module in the device in embodiment can be described and be distributed in the device of embodiment according to embodiment, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into multiple submodules.
Finally it should be noted that: above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the utility model embodiment technical scheme.
Claims (6)
1. an active noise reduction controller, is characterized in that, comprise substrate, silicon microphone, pass through integrated asic chip and the shell of asic technology, wherein:
Described silicon microphone and described asic chip are fixed on described substrate and are positioned at described shell and the enclosure space of described substrate formation, and between described silicon microphone and described asic chip, connect by first group of gold thread pressure welding, 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 sound hole, so that ambient noise is gathered and convert to analog electrical signal by described sound hole by described silicon microphone;
On described substrate, be 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 by the printed wire in described substrate and described second group of gold thread respectively drives positive pin, earphone drives negative pin, audio frequency input pin, power supply 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 connecting 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 and amplifies processing from the analog electrical signal of described silicon microphone and to this analog electrical signal, and will pass to described A/D change-over circuit through amplifying analog electrical signal after treatment, described A/D change-over circuit converts analog electrical signal digital electric signal to and is passed to described digital signal processing circuit, described digital signal processing circuit carries out described digital electric signal to send into described D/A change-over circuit after filtering processing, digital electric signal after treatment filtering 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 itself and the audio signal of being come by the transmission of described audio frequency input pin are superposeed, described differential drive circuit is transformed into differential signal Buffer output to drive headphone unit by the mixed signal after stack.
3. active noise reduction controller according to claim 2, is characterized in that, described digital signal processing circuit comprises the combination of 5～10 single orders or second order iir filter.
4. active noise reduction controller according to claim 2, it is characterized in that, on described asic chip, be also provided with the first analog switch and the second analog switch, described the first analog switch and described second analog switch Dou Wei No. bis-selector switches, and described the first analog switch and described the second analog switch synchronously switch selection, described the first analog switch Er road input connects respectively anode and the described audio frequency input pin of described differential signal, the output of described the 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, described the second analog switch Er road input connects respectively negative terminal and the described pin publicly of described differential signal, the output of described the 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 switches to described differential signal when described the first analog switch drives positive pin to be connected with described earphone, the negative terminal that described the second analog switch synchronously switches to described differential signal drives negative pin to be connected 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, in the time that described the first analog switch switches to described audio signal input end and drives positive pin to be connected with described earphone, described in described the second analog switch synchronously switches to, pin drives negative pin to be connected with described earphone publicly, the audio signal of being come by the transmission of described audio frequency input pin directly drives headphone unit, and 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 also comprises mode control circuit, described mode control circuit comprises a voltage comparator, the logic level output of this voltage comparator is as the output of described mode control circuit, this voltage comparator compares the voltage of described power input and threshold voltage, when the voltage of described power input is during higher than described threshold voltage, described mode control circuit output logic high level, when the voltage of described power input is during lower than described threshold voltage, described mode control circuit output logic low level, be used for controlling described the first analog switch, the switching of the second analog switch is selected, and described preamplifier circuit for microphone, described A/D change-over circuit, described digital signal processing circuit, described D/A change-over circuit, the open and close of described audio signal hybrid circuit and described differential drive circuit, in the time of described mode control circuit output logic high level, 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 that described the first analog switch switches to described differential signal drives positive pin to be connected with described earphone, the negative terminal that described the second analog switch synchronously switches to described differential signal drives negative pin to be connected with described earphone, described active noise reduction controller is operated in described active noise reduction pattern, in the time of mode control circuit output logic low level, described the first analog switch switches to described audio signal input end and drives positive pin to be connected with described earphone, described in described the second analog switch synchronously switches to, pin drives negative pin to be connected with described earphone publicly, 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, and described active noise reduction controller is operated in described direct mode operation.
6. active noise reduction controller according to claim 5, is characterized in that, described threshold voltage is a reference voltage between 1.6V～2.1V.
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| CN201420188342.6U CN203840513U (en) | 2014-04-17 | 2014-04-17 | Active noise reduction controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420188342.6U CN203840513U (en) | 2014-04-17 | 2014-04-17 | Active noise reduction controller |
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| CN203840513U true CN203840513U (en) | 2014-09-17 |
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| CN104754436A (en) * | 2015-03-13 | 2015-07-01 | 钰太芯微电子科技（上海）有限公司 | Active noise reducing method and noise reducing earphone |
| CN105025418A (en) * | 2014-04-17 | 2015-11-04 | 北京卓锐微技术有限公司 | Active noise reduction controller |
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| CN105025418A (en) * | 2014-04-17 | 2015-11-04 | 北京卓锐微技术有限公司 | Active noise reduction controller |
| CN105025418B (en) * | 2014-04-17 | 2018-10-09 | 山东共达电声股份有限公司 | A kind of active noise reduction controller |
| TWI549525B (en) * | 2015-02-11 | 2016-09-11 | With three-dimensional effect and to enhance the noise reduction of the environment noise loudspeakers active noise reduction headphones | |
| CN104754436A (en) * | 2015-03-13 | 2015-07-01 | 钰太芯微电子科技（上海）有限公司 | Active noise reducing method and noise reducing earphone |
| CN104754436B (en) * | 2015-03-13 | 2024-01-16 | 钰太芯微电子科技（上海）有限公司 | Active noise reduction method and noise reduction earphone |
| JP2022084794A (en) * | 2018-04-26 | 2022-06-07 | 深▲セン▼市韶音科技有限公司 | Vibration removal device and method for dual microphone earphone |
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