CN201430684Y - Microphone integrated with noise-decreasing function - Google Patents
Microphone integrated with noise-decreasing function Download PDFInfo
- Publication number
- CN201430684Y CN201430684Y CN2009201312560U CN200920131256U CN201430684Y CN 201430684 Y CN201430684 Y CN 201430684Y CN 2009201312560 U CN2009201312560 U CN 2009201312560U CN 200920131256 U CN200920131256 U CN 200920131256U CN 201430684 Y CN201430684 Y CN 201430684Y
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- circuit
- signal
- microphone
- module
- noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/005—Electrostatic transducers using semiconductor materials
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
- H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
- H04R2410/03—Reduction of intrinsic noise in microphones
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model relates to a microphone, which provides a microphone integrated with a noise-decreasing function. The microphone comprises internal components and an outer casing for encapsulating the internal components; the internal components include a microphone device and a first chip electrically connected with the microphone device. The microphone is characterized in that the first chip consists of driving modules and noise eliminating modules, the driving modules and the noise eliminating modules are mutually integrated on one chip and electrically connected. By integrating the driving modules and the noise eliminating modules of a driving chip and a noise eliminating device on one chip, the microphone integrated with the noise-decreasing function occupies less total volume and reduces technical complexity when compared with a separated driving chip and a noise-decreasing device in the prior art, thereby achieving the purpose.
Description
Technical field
The utility model relates to a kind of microphone, relates more specifically to a kind of microphone of integrated decrease of noise functions.
Background technology
Microphone is a kind of device that audio signal is converted to the signal of telecommunication.Fig. 1 is the structural representation of the microphone of prior art.As shown in Figure 1, general microphone comprises intraware 100 and 300 two parts of shell that are used to encapsulate and protect described intraware 100.Described intraware 100 comprises two separate microphone arrangements 101 and chip for driving 102 again.In the communications field, it is modal a kind of exchange way that sound exchanges, so microphone is applied in the communications field widely.In application process, the residing environment of microphone is various, and a lot of environment can influence the voice quality of communication.So, in order to improve voice quality, can adopt usually one independently 400 pairs of common microphone output signals of noise elimination apparatus carry out reprocessing, form microphone system, to reduce The noise to greatest extent.102 of microphone arrangement 101 and chip for driving are passed through wiring 200 and are electrically connected, and described noise elimination apparatus 400 also is electrically connected by wiring 200 with 102 of chip for driving.Existing microphone system has increased the volume and the technical complexity of microphone system owing to having increased noise elimination apparatus 400, has increased cost, and trend also ultra-thin day by day with electronic device, extra smallization fails to agree.
The utility model content
In view of foregoing description, the technical problem that the utility model mainly solves is:
Have now in the microphone system because the volume that external denoising device caused is big, the problem of technical sophistication.
The technical scheme that the utility model adopted:
A kind of microphone of integrated decrease of noise functions, comprise intraware and the shell that is used to encapsulate intraware, described intraware comprises electret microphone device, first chip that is electrically connected with the electret microphone device, wherein, described first chip comprises driver module and the noise cancellation module that is integrated in mutually on the same chip and is electrically connected.
The utility model also provides a kind of microphone of integrated decrease of noise functions, comprise intraware and the shell that is used to encapsulate intraware, described intraware comprises MEMS microphone module, the driver module that is electrically connected with the MEMS microphone module and the noise cancellation module that is electrically connected with driver module, integrated formation first chip of two modules of described intraware, remaining module forms independently second device.
The utility model also provides a kind of microphone of integrated decrease of noise functions, comprise intraware and the shell that is used to encapsulate intraware, described intraware comprises first chip, wherein, described first chip comprises MEMS microphone module, driver module and the noise cancellation module that is integrated in same chip, described MEMS microphone module is electrically connected with driver module, and described driver module is electrically connected with noise cancellation module.
The beneficial effect of the technical scheme that the utility model adopted:
Intraware of the present utility model comprises microphone module, driver module and noise cancellation module, does not need the wiring that passes shell of the prior art, so reduced the technical sophistication degree.The utility model is integrated in two modules in the intraware on the chip at least, and the chip that independently forms with respect to each module in the prior art or to install shared volume summation little has reached the purpose that the present utility model is created.
Description of drawings
Fig. 1 microphone structure schematic diagram of the prior art;
The microphone structure schematic diagram of Fig. 2 the utility model first embodiment;
The microphone structure schematic diagram of Fig. 3 the utility model second embodiment;
The numeral output microphone chip schematic diagram of Fig. 4 the utility model first embodiment;
The simulation output microphone chip schematic diagram of Fig. 5 the utility model first embodiment;
The numeral output microphone chip schematic diagram of Fig. 6 the utility model second embodiment;
The simulation output microphone chip schematic diagram of Fig. 7 the utility model second embodiment;
The structural representation of the preamplifier of Fig. 8 the utility model embodiment;
The noise cancellation module structural representation of Fig. 9 the utility model embodiment.
Embodiment
In order to further specify content of the present utility model, the utility model is done a detailed description below in conjunction with embodiment.
Above-mentioned " microphone system " is meant the microphone with the function of abating the noise, and is called the microphone of integrated decrease of noise functions below.All electronic components relevant with noise removing and annexation thereof are called noise cancellation module in the noise elimination apparatus.Realize in the chip for driving that the relevant electronic component and the annexation thereof that drive function become driver module.In like manner, associated electronic components in the microphone arrangement and annexation thereof become microphone module.
First embodiment is integrated into an example on the chip with noise elimination apparatus and chip for driving, and two embodiments of first embodiment will be shown successively; Second embodiment is integrated into an example on the chip with microphone arrangement, noise elimination apparatus and chip for driving, and two embodiments of second embodiment will be shown successively.
Embodiment 1
Fig. 2 is the microphone structure schematic diagram of the utility model first embodiment.Fig. 4 is the numeral output microphone chip schematic diagram of the utility model first embodiment.Fig. 5 is the simulation output microphone chip schematic diagram of the utility model first embodiment.According to first embodiment, as shown in Figure 2, a kind of microphone of integrated decrease of noise functions comprises intraware 100 and is used to encapsulate the shell 300 of this intraware 100, described intraware 100 comprises microphone arrangement 101 and first chip 102 that is electrically connected with sensor device 101 by wiring 200, wherein, described first chip 102 is integrated with driver module and noise cancellation module.The utility model embodiment is integrated into the function that the chip for driving that is separated from each other and noise elimination apparatus are had in first chip 102, just reduces the step of chip of encapsulation or device in the application of microphone.Present embodiment separates two scripts independently that driver module and noise cancellation module are encapsulated on the same chip, and is inevitable, realized the main purpose of the invention with respect to the technical scheme of prior art present embodiment.Certainly, the utility model embodiment is encapsulated into housings with noise cancellation module from the enclosure of microphone, has reduced the technical sophistication degree of encapsulation.Because the sealing property of the shell of microphone must be good, could guarantee that like this intraware of microphone has stronger anti-electromagnetic interference environment and such air-tightness that also could guarantee intraware environment of living in.Must increase microphone in the technology input aspect sealing and the anti-electromagnetic interference so introduce a wiring from enclosure.
Certainly, the microphone arrangement in the present embodiment can be the electret microphone microphone arrangement.
Certainly, the microphone arrangement in the present embodiment can also be MEMS (Micro-Electro-MechanicalSystems, a MEMS (micro electro mechanical system)) microphone.At this moment, first chip can comprise any two in MEMS microphone module, noise cancellation module, the driver module, a remaining module formation one is second device independently, but the electrical connection between three modules satisfies: noise cancellation module is electrically connected with driver module, and driver module is electrically connected with microphone module.The utlity model has among the embodiment of MEMS microphone module and can also comprise ∑-Δ ADC modulator, described ∑-Δ ADC modulator is electrically connected with noise cancellation module.
Numeral output microphone chip shown in Figure 4 is a kind of embodiment of the utility model first embodiment.A kind of microphone with decrease of noise functions, comprise the intraware that is encapsulated in the shell, described intraware comprises the electret microphone device 100 and first chip 200, and described first chip 200 comprises low noise amplifier 201, noise cancellation module 202 and ∑-Δ ADC modulator 203.Low noise amplifier 201 and ∑-Δ ADC modulator 203 belongs to driver module.One end of described electret microphone device 100 is connected an input and the ground connection of the low noise amplifier 201 of first chip 200 by wiring, the other end is connected another input of the low noise amplifier 201 of first chip 200 by wiring, the output of low noise amplifier 201 is connected the input of noise cancellation module 202, the output of noise cancellation module 202 is connected the input of ∑-Δ ADC modulator 203, and the output of ∑-Δ ADC modulator 203 is exported digital signal.Certainly, low noise amplifier 201, noise cancellation module 202 and ∑-Δ ADC modulator 203 threes' position relation can change, the order of connection of not excessive ∑-Δ ADC modulator 203 when preceding, module thereafter or amplifier all must be can processing digital signal device.The operation principle of the numeral output microphone of present embodiment: when the electret microphone device receives voice signal, can produce signal of telecommunication output, this signal of telecommunication amplifies through low noise amplifier 201, process noise cancellation module 202 abating the noise then, be digital signal output by ∑-Δ ADC modulator 203 with analog signal conversion at last, finish the function of microphone.
Numeral output microphone chip shown in Figure 5 is a kind of embodiment of the utility model first embodiment.A kind of microphone with decrease of noise functions, comprise the intraware that is encapsulated in the shell, described intraware comprises the MEMS microphone arrangement 100 and first chip 200, the two ends of described MEMS microphone arrangement 100 are connected with the preamplifier 205 of first chip 200 by wiring respectively, during MEMS microphone arrangement 100 received audio signals, will produce a signal of telecommunication, preamplifier 205 is sent into the noise cancellation module 202 that is attached thereto after this signal of telecommunication is amplified, noise cancellation module 202 will be finished the function of microphone except that the output of the signal of telecommunication after making an uproar.
Embodiment 2
Fig. 3 is the microphone structure schematic diagram of the utility model second embodiment.Fig. 6 is the numeral output microphone chip schematic diagram of the utility model second embodiment.Fig. 7 is the simulation output microphone chip schematic diagram of the utility model second embodiment.According to second embodiment, as shown in Figure 3, a kind of microphone of integrated decrease of noise functions comprises first chip 100 and is used to encapsulate the shell 300 of this chip that wherein, described first chip 100 is integrated with MEMS microphone module, driver module and noise cancellation module.In enforcement of the present utility model, because present embodiment have only one first chip, three chips than before or the quantity of device will be lacked, and have reduced the processing step in the encapsulation process.And the microphone of present embodiment do not need to exist the gap between the chip, so than prior art, reduced the shared volume of chip.Certainly, present embodiment has also reduced the technical sophistication degree.The shared volume of the microphone of present embodiment also will lack than first embodiment.
Numeral output microphone chip shown in Figure 6 is a kind of embodiment of the utility model second embodiment.A kind of microphone with decrease of noise functions, comprise first chip 200 that is encapsulated in the shell, described first chip 200 comprises MEMS microphone module 100, preamplifier 205, noise cancellation module 202 and ∑-Δ ADC modulator 203, the two ends of described MEMS microphone module 100 are electrically connected with preamplifier 205 respectively, during MEMS microphone module 100 received audio signals, will produce a signal of telecommunication, preamplifier 205 is sent into the noise cancellation module 202 that is attached thereto after this signal of telecommunication is amplified, noise cancellation module 202 will output to ∑-Δ ADC modulator 203 except that the signal of telecommunication after making an uproar, ∑-Δ ADC modulator 203 is finished the function of microphone with digital signal output.Certainly, preamplifier 205 can connect ∑-Δ ADC modulator 203 earlier, and ∑-Δ ADC modulator 203 connects noise cancellation module 202 again, and digital signal is from noise cancellation module 202 outputs.
Simulation output microphone chip shown in Figure 7 is a kind of embodiment of the utility model second embodiment.A kind of microphone with decrease of noise functions, comprise first chip 200 that is encapsulated in the shell, described first chip 200 comprises MEMS microphone module 100, preamplifier 205, noise cancellation module 202, and the annexation of each module and function do not repeat them here as described in the embodiment 1.
In order to make the technical solution of the utility model clearer, in conjunction with a kind of embodiment of the utility model second embodiment the utility model is further described below with reference to Fig. 7, Fig. 8, Fig. 9.
With reference to Fig. 8, the preamplifier 205 of present embodiment is described in conjunction with Fig. 7.Described preamplifier 205 comprises the low noise amplifier 2021 that is connected with mems microphone module 100 1 ends, and described low noise amplifier 2021 outputs to noise cancellation module 202 after with signal of telecommunication processing and amplifying.Described low noise amplifier 2021 is an activated amplifier, its source termination pedestal generator 2022, another output of pedestal generator 2022 is connected with voltage-multiplying circuit 2023, and voltage-multiplying circuit 2023 provides constant electric charge to mems microphone module 100 under the control of clock generator 2024.Low noise amplifier 2021, voltage-multiplying circuit 2023, pedestal generator 2023 and clock generator 2024 do not repeat them here for well known to a person skilled in the art device.
With reference to Fig. 9, the noise cancellation module 202 of present embodiment is described in conjunction with Fig. 7, Fig. 8.The noise cancellation module 202 of this enforcement can be that known described noise cancellation module can also be the noise cancellation module of the utility model original creation.Known noise cancellation module does not repeat them here.Introduce the noise cancellation module of the utility model original creation below, be called for short noise cancellation module below.As shown in Figure 9, noise cancellation module 202 comprises the audio collection circuit 2031 of reception from the signal of telecommunication of low noise amplifier 2021, the signal of telecommunication part that audio collection circuit 2031 is gathered is extracted circuit 2034 through control signal, another part is through controlled attenuator circuit 2032, described controlled attenuator circuit 2032 carries out the audio signal decay under the control signal control that control signal extraction circuit 2034 sends, be aggregated into de-noising amplifying circuit 2033 at last, the signal output after the control signal control that de-noising amplifying circuit 2033 control signals extraction circuit 2034 sends is handled down and will be handled.
Described audio collection circuit 2031 comprises bleeder circuit, first electric capacity and the first anti-phase follower, and described first electric capacity, one end is electrically connected on the first anti-phase follower, and the other end is connected with bleeder circuit.
Controlled attenuator circuit 2032 comprises first control switch that first transport and placing device is attached thereto.The control signal of described first control switch is extracted circuit 2034 from control signal;
De-noising amplifying circuit 2033 comprises the controllable inverter 3a that is electrically connected with the first anti-phase follower and control signal extraction circuit 2034, be electrically connected the second anti-phase follower 3b with the first anti-phase follower, the 3rd anti-phase follower 3c that is electrically connected with controllable inverter 3a receives the 4th anti-phase adder 3d of the signal that the 3rd anti-phase follower 3c, the second anti-phase follower 3b send and receives the low pass filter 3e of the signal after the 4th anti-phase adder 3d handles.Described low pass filter 3e comprises the resistance and the electric capacity of mutual electrical connection.Described low pass filter 3e carries out exporting after the filtering to received signal.
Control signal is extracted circuit 2034 and is comprised that the first comparison circuit 4b and effective value RMS that attenuation control signal is provided detect treatment circuit.The described first comparison circuit 4b will compare and the output attenuatoin control signal with reference to a voltage of threshold voltage and the output of effective value RMS detection treatment circuit respectively.Described effective value RMS detects the pre-amplifying circuit 4a of signal that treatment circuit comprises the bleeder circuit output signal that receives audio collection circuit 2031, the 4th comparison circuit 4c of the output signal of the pre-amplifying circuit 4a of received signal, the 5th comparison circuit 4d of another output signal of the pre-amplifying circuit 4a of received signal, receive the 4th comparison circuit 4c, the signal of the 5th comparison circuit 4d also carries out the Logical processing unit 4e of logical process to it, described Logical processing unit 4e generates effective value RMS test section triggering signal through logical process, the logical signal of Logical processing unit 4e and output logic processing section 4q output is carried out the input logic treatment circuit 4f of logical process, the selection circuit 4g that is connected with the pre-amplifying circuit 4a of signal with input logic treatment circuit 4f, described selection circuit 4g outputs to effective value RMS testing circuit 4h with the signal that chooses, described effective value RMS testing circuit 4h first end is connected with the first comparison circuit 4b, second end and the second comparison circuit 4i, the 3rd end the 3rd comparison circuit 4k, the signal of described the 3rd comparison circuit 4k output is a secondary signal, the signal that control signal compensating circuit 4j exports the second comparison circuit 4i compensates the back and is input among the 4q of output logic processing section as first signal, and output logic processing section 4q is respectively to first signal, secondary signal is carried out logical process and is obtained first output signal.Described first output signal control controllable inverter 3a operates.
The noise cancellation module 202 of present embodiment decays by control signal extraction circuit 2034 controlled attenuator circuits 2032 of control and de-noising amplifying circuit 2033 and amplifies, and has reached the purpose of eliminating ambient noise, has realized the purpose that the present utility model is created.
The above is preferred embodiment of the present utility model only, is not to be used to limit protection range of the present utility model.All any modifications of within spirit of the present utility model and principle, being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1, a kind of microphone of integrated decrease of noise functions, comprise intraware and the shell that is used to encapsulate intraware, described intraware comprises electret microphone device, first chip that is electrically connected with the electret microphone device, it is characterized in that described first chip comprises driver module and the noise cancellation module that is integrated in mutually on the same chip and is electrically connected.
According to the microphone of the described integrated decrease of noise functions of claim 1, it is characterized in that 2, described driver module has the ∑-Δ ADC modulator that is electrically connected with noise cancellation module.
According to the microphone of claim 1 or 2 described integrated decrease of noise functions, it is characterized in that 3, described noise cancellation module comprises the audio collection circuit of the signal that receives driver module output, controlled attenuator circuit, de-noising amplifying circuit; Described audio collection circuit is exported two signals, and a signal is transferred to control signal and extracts circuit, and another signal transmits controlled attenuator circuit; Described control signal is extracted circuit and is handled also controlled signal to the received signal; Described controlled attenuator circuit is decayed to the signal that receives under the control of the control signal that control signal extraction circuit sends and is outputed to the de-noising amplifying circuit; The signal output of described de-noising amplifying circuit after the signal that under the another control signal control that control signal extraction circuit sends controlled attenuator circuit is sent carries out processing and amplifying and will handle.
4, a kind of microphone of integrated decrease of noise functions, comprise intraware and the shell that is used to encapsulate intraware, it is characterized in that, described intraware comprises MEMS microphone module, the driver module that is electrically connected with the MEMS microphone module and the noise cancellation module that is electrically connected with driver module, integrated formation first chip of two modules of described intraware, remaining module forms independently second device.
According to the microphone of the described integrated decrease of noise functions of claim 4, it is characterized in that 5, described first chip comprises driver module and noise cancellation module.
According to the microphone of the described integrated decrease of noise functions of claim 4, it is characterized in that 6, described driver module has the ∑-Δ ADC modulator that is electrically connected with noise cancellation module.
According to the microphone of claim 4 or 5 or 6 described integrated decrease of noise functions, it is characterized in that 7, described noise cancellation module comprises the audio collection circuit of the signal that receives driver module output, controlled attenuator circuit, de-noising amplifying circuit; Described audio collection circuit is exported two signals, and a signal is transferred to control signal and extracts circuit, and another signal transmits controlled attenuator circuit; Described control signal is extracted circuit and is handled also controlled signal to the received signal; Described controlled attenuator circuit is decayed to the signal that receives under the control of the control signal that control signal extraction circuit sends and is outputed to the de-noising amplifying circuit; The signal output of described de-noising amplifying circuit after the signal that under the another control signal control that control signal extraction circuit sends controlled attenuator circuit is sent carries out processing and amplifying and will handle.
8, a kind of microphone of integrated decrease of noise functions, comprise intraware and the shell that is used to encapsulate intraware, described intraware comprises first chip, it is characterized in that, described first chip comprises MEMS microphone module, driver module and the noise cancellation module that is integrated in same chip, described MEMS microphone module is electrically connected with driver module, and described driver module is electrically connected with noise cancellation module.
9, the microphone of described integrated decrease of noise functions according to Claim 8 is characterized in that described driver module has the ∑-Δ ADC modulator that is electrically connected with noise cancellation module.
10, according to Claim 8 or the microphone of 9 described integrated decrease of noise functions, it is characterized in that described noise cancellation module comprises the audio collection circuit of the signal that receives driver module output, controlled attenuator circuit, de-noising amplifying circuit; Described audio collection circuit is exported two signals, and a signal is transferred to control signal and extracts circuit, and another signal transmits controlled attenuator circuit; Described control signal is extracted circuit and is handled also controlled signal to the received signal; Described controlled attenuator circuit is decayed to the signal that receives under the control of the control signal that control signal extraction circuit sends and is outputed to the de-noising amplifying circuit; The signal output of described de-noising amplifying circuit after the signal that under the another control signal control that control signal extraction circuit sends controlled attenuator circuit is sent carries out processing and amplifying and will handle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201312560U CN201430684Y (en) | 2009-04-30 | 2009-04-30 | Microphone integrated with noise-decreasing function |
| PCT/CN2010/071861 WO2010124561A1 (en) | 2009-04-30 | 2010-04-17 | Microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201312560U CN201430684Y (en) | 2009-04-30 | 2009-04-30 | Microphone integrated with noise-decreasing function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201430684Y true CN201430684Y (en) | 2010-03-24 |
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ID=42034423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201312560U Expired - Fee Related CN201430684Y (en) | 2009-04-30 | 2009-04-30 | Microphone integrated with noise-decreasing function |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN201430684Y (en) |
| WO (1) | WO2010124561A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124561A1 (en) * | 2009-04-30 | 2010-11-04 | Byd Company Limited | Microphone |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69939976D1 (en) * | 1999-05-28 | 2009-01-08 | Texas Instruments Inc | Digital speaker |
| JP3861006B2 (en) * | 2000-04-26 | 2006-12-20 | ホシデン株式会社 | Semiconductor electret condenser microphone |
| CN201430684Y (en) * | 2009-04-30 | 2010-03-24 | 比亚迪股份有限公司 | Microphone integrated with noise-decreasing function |
-
2009
- 2009-04-30 CN CN2009201312560U patent/CN201430684Y/en not_active Expired - Fee Related
-
2010
- 2010-04-17 WO PCT/CN2010/071861 patent/WO2010124561A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124561A1 (en) * | 2009-04-30 | 2010-11-04 | Byd Company Limited | Microphone |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010124561A1 (en) | 2010-11-04 |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100324 Termination date: 20160430 |