CN105872904A - Microphone circuit, system and headset - Google Patents
Microphone circuit, system and headset Download PDFInfo
- Publication number
- CN105872904A CN105872904A CN201610249272.4A CN201610249272A CN105872904A CN 105872904 A CN105872904 A CN 105872904A CN 201610249272 A CN201610249272 A CN 201610249272A CN 105872904 A CN105872904 A CN 105872904A
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- signal
- mic
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- mike
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The embodiment of the invention provides a microphone circuit, a system and a headset. The microphone circuit comprises a microphone chip and a signal conditioning circuit. The microphone chip is provided with a direct-current power input end, a first signal output end and a grounding end connected with the ground. The signal conditioning circuit is connected between the first signal output end and the ground to make an alternating-current signal access formed between the first signal output end and the ground, and is used for superposing a first analog audio signal output by the first signal output end to a direct-current power input signal of the direct-current power input end for output. According to the embodiment, the signal conditioning circuit capable of conducting alternating-current signals is arranged between the first signal output end of an original output analog audio signal and the ground, so that the analog signal output by the first signal output end is superposed to the direct-current power input signal of the direct-current power input end for output; as a result, output pins of the microphone circuit are reduced, and then operation space is provided for saving interface resources between microphone equipment and terminals.
Description
Technical field
The present embodiments relate to a kind of circuit and system, particularly relate to a kind of microphone circuit, be
System and earphone.
Background technology
External MIC is always the important peripheral hardware of the terminals such as computer, mobile phone, panel computer, along with shifting
Dynamic terminal universal, with the earphone of MIC relatively broad apply on mobile terminals.MIC's
Earphone has had broadcasting audio frequency (video, music, call voice export) and sound concurrently (during call
Voice) function that inputs.
As it is shown in figure 1, the structural representation of the MIC circuit being connected with mobile phone that it is prior art.
The MIC circuit of prior art needs three connecting lines to be attached with mobile phone terminal, is from MIC respectively
Earth terminal GND, MIC signal output part OUTPUT and DC supply input VDD of chip
Three connecting lines drawn.Along with the development of technology, between terminal with peripheral hardware, there is multiple connection
Interface, such as serial ports, parallel port, HDMI (High Definition Multimedia Interface, height
Definition multimedia interface), SATA (Serial Advanced Technology Attachment, string
Row Advanced Technology Attachment), USB (Universal Serial Bus, USB (universal serial bus)) TYPE-A,
The interface such as USB TYPE-B, USB TYPE-C.But, due to terminal itself and peripheral hardware
The trend of the complication of miniaturization and transmission information, interface resource is more and more nervous, therefore, as
What more efficiently saves the emphasis direction that interface resource is also research and development at present.
Summary of the invention
Embodiments provide a kind of microphone circuit, system and earphone, to reduce Mike
The connection pin of equipment, and then provide operation for saving the interface resource between Mike's equipment and terminal
Space.
Embodiments provide a kind of microphone circuit, including: Mike's chip and Signal Regulation
Circuit, described Mike's chip has DC supply input, the first signal output part and is connected to ground
Earth terminal,
Described circuit for signal conditioning is connected between described first signal output part and ground so that in institute
State composition AC signal path between the first signal output part and described ground, for by described first letter
First simulated audio signal of number outfan output is added to the unidirectional current of described DC supply input
Export in the input signal of source.
The embodiment of the present invention additionally provides a kind of earphone, including above-mentioned microphone circuit.
The embodiment of the present invention additionally provides a kind of microphone circuit system, including: terminal and above-mentioned
Microphone circuit.
The microphone circuit of the embodiment of the present invention, system and earphone, by original for defeated
Go out and the letter that can turn on AC signal is set between the first signal output part and the ground of simulated audio signal
Number regulation circuit, thus by defeated for the analogue signal DC source that is added to of the first signal output part output
Enter and export on the DC supply input signal of end, thus decrease the output of original Mac circuit
Pin, and then provide working place for saving the interface resource between Mike's equipment and terminal.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the present invention
Technological means, and can be practiced according to the content of description, and the present invention's be upper in order to allow
State and can become apparent with other objects, features and advantages, below especially exemplified by the concrete reality of the present invention
Execute mode.
Accompanying drawing explanation
Fig. 1 is the structural representation of the MIC circuit being connected with mobile phone of prior art.
Fig. 2 is one of structural representation of microphone circuit of the embodiment of the present invention one.
Fig. 3 is the two of the structural representation of the microphone circuit of the embodiment of the present invention one.
Fig. 4 is the equivalent circuit theory figure of the microphone circuit of the embodiment of the present invention one.
Fig. 5 is the structural representation of the microphone circuit of the embodiment of the present invention two.
Fig. 6 is the structural representation of the microphone circuit of the embodiment of the present invention three.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although it is attached
Figure shows the exemplary embodiment of the disclosure, it being understood, however, that can be with various shapes
Formula realizes the disclosure and should not limited by embodiments set forth here.On the contrary, it is provided that these
Embodiment is able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
Embodiment one
As in figure 2 it is shown, one of structural representation of microphone circuit that it is the embodiment of the present invention one,
This microphone circuit includes: Mike (MIC) chip 1 and circuit for signal conditioning 2, described Mike's core
Sheet 1 has DC supply input VDD, the first signal output part OUT1 and connecing of being connected to ground
Ground end GND.
Described circuit for signal conditioning is connected between described first signal output part and ground so that in institute
State composition AC signal path between the first signal output part and described ground, for by described first letter
First simulated audio signal of number outfan output is added to the unidirectional current of described DC supply input
Export in the input signal of source.Wherein, in embodiments of the present invention, described Mike's chip is preferred
Use MEMS (Micro Electro Mechanical System) type Mike's chip.
The present embodiment takes full advantage of the principle that the void of the operational amplifier in Mike's chip is short, passes through
Between the first signal output part OUT1 and ground, it is connected a signal allowing AC signal to pass through adjust
Economize on electricity road, thus between VDD, OUT1 and ground, define AC signal path so that originally
Can be added to vdd terminal from the simulated audio signal of the first signal output part OUT1 output, and lead to
Cross and export simulated audio signal to the circuit of MIC chip power supply, thus decrease original Mac circuit
Output pin, and then provide operation sky for saving the interface resource between Mike's equipment and terminal
Between.
Specifically, as it is shown on figure 3, the structure of the microphone circuit that it is the embodiment of the present invention one is shown
The two of intention, wherein, circuit for signal conditioning 2 can include filter circuit 21, this filter circuit 21
One end be connected with described first signal output part, other end ground connection, its bandpass range is sound audio
The scope of rate, i.e. can AC signal beyond filtering sound frequency, only make effective analogue audio frequency
Signal averaging exports on the circuit of described DC supply input VDD.
Further, this microphone circuit can also include the first resistance 3, one end of this first resistance
Connecting described DC supply input, the other end connects DC source, in described first resistance and institute
State and between DC supply input, be provided with secondary signal outfan OUT2, this secondary signal outfan
OUT2 folds with described DC supply input signal for outwards exporting described first simulated audio signal
The second simulated audio signal after adding, the Main Function of this first resistance is, defeated at DC source
Enter to hold to be formed on the circuit of VDD load such that it is able to export the second simulated audio signal.Need
Bright is, although the second current simulated audio signal and originally should be from the first signal output part
Simulated audio signal is different on signal value, but owing to DC supply input VDD inputs
Be a stable direct current signal, therefore for audio signal, its amplitude is overall
Changing, its spectral characteristic does not change, the phase between the amplitude of each sampled point in audio signal
Relation is not changed, therefore, still contains the characteristic of original sound signal.
Further, this circuit for signal conditioning can also include the second resistance 22, described second resistance
One end be connected with described first signal output part, other end ground connection, described second resistance is used for adjusting
Save the DC point of described second simulated audio signal.The Main Function increasing by the second resistance is,
DC point is drawn high from ground such that it is able to the DC supply input that is preferably added to signal is enterprising
Row output.Preferably, the resistance of described first resistance and described second resistance should meet make described
The amplitude fluctuations scope of the second simulated audio signal is in output voltage and the ground connection of described DC source
Condition between voltage, i.e. by the first resistance and the dividing potential drop of the second resistance, by the second analogue audio frequency
Signal DC point is stable a suitable position, thus reduces from DC supply input
The distortion of the signal of the circuit output of VDD.
The most again by the equivalent circuit theory figure shown in Fig. 4, further illustrate above-mentioned Mike
Wind-powered electricity generation road.In Fig. 4, by simple for the sensor element being used for collected sound signal in MIC chip
Being expressed as sensor 11, the ultimate principle of sensor 11 is the telecommunications being triggered by vibrating diaphragm and producing fluctuation
Number (figure illustrates with wave).In Fig. 4, sensor 11 exports by acoustical signal to Q point
The signal of telecommunication converted.Q point be by empty for the operational amplifier in MIC chip short after, VDD
It is equivalent to the most i.e. Q point, it can be seen that deposit between ground below Q point with OUT1
In Liang Ge branch, the most individual branch flows to the second resistance 22, and another branch flows to filter circuit 21.
In the drawings, it is divided into DC component and AC compounent to express the current signal flowing through each branch road,
Wherein, the branch at the first resistance place i.e. has AC compounent You Youzhi road component, in filtered electrical
In the branch on road 21, for AC compounent, impedance is the least, and therefore, AC compounent will be main
Flow to the branch at filter circuit 21 place, and DC component flows mostly to the second resistance 22 place
Branch.Therefore, the equivalent circuit diagram of Fig. 4 can draw following equation:
I1+ △ i1=I2+ △ i3 ... ... ... ... ... ... ... ... formula (1)
Understanding as being analyzed above, AC compounent flows mostly to the branch at filter circuit 21 place, and straight
Flow component flows mostly to the branch at the second resistance 22 place, it follows that conclusion: △ i1 ≈
△i3、I1≈I2.And what △ i1 or △ i3 was caused mainly due to the output of sensor 11, i.e.
The main source of one simulated audio signal (simulated audio signal that originally should export from OUT1)
Be exactly the output of sensor 11, i.e. △ i3 is exactly the first simulated audio signal, and I1 corresponds to unidirectional current
Source input signal.By above-mentioned computing formula, △ i1 ≈ △ i3, then reality is exactly by △ i1
Be added to the first resistance place road on, the namely circuit of DC supply input VDD
On, it is achieved thereby that superposed simulation audio signal exports on DC supply input signal.
Embodiment two
Embodiment one mainly introduces interlock circuit structure around MIC chip, and the present embodiment will enter
One step introduction interlock circuit structure under the scene that above-mentioned microphone circuit is connected with terminal.
As it is shown in figure 5, the structural representation of the microphone circuit that it is the embodiment of the present invention two, implementing
On the basis of the microphone circuit of example one, add interface module 4.Wherein, described secondary signal output
End OUT2 is positioned at end side, at the unidirectional current of described secondary signal outfan Yu described Mike's chip
Interface module 4 is set between the input of source.
Further, described end side is provided with Mike's modulus (ADC) processing module, described
Mike's modulus processing module includes MICBIAS signal output part and Mike's signal input part, described directly
Stream power supply is the MICBIAS signal of MICBIAS signal output part output, described first resistance
One end is connected with described MICBIAS signal output part, the other end by described interface module with described
The DC supply input of Mike's chip connects, described secondary signal outfan and described Mike's signal
Input connects.Additionally, earth terminal GND is also by Mike's modulus of interface module 4 with end side
(ADC) processing module earth terminal connects, so that Mike's chip and Mike's modulus of end side
(ADC) processing module is altogether.
In the present embodiment, be added to DC source by the analogue signal of the first signal output part output
Export on the DC supply input signal of input, thus decrease the defeated of original Mac circuit
Go out pin.Additionally, as in Fig. 5 it can be seen that secondary signal outfan is arranged at terminal side,
Thus also save the pin resource of the interface module between microphone circuit and terminal.
Embodiment three
As shown in Figure 6, it is the structural representation of microphone circuit of the embodiment of the present invention three.This
Embodiment is with the difference of embodiment two, and the interface module 4 in the present embodiment is suitable for having
Answer the interface module of positive and negative inserting structure.
Specifically, this interface module can have on position and have the first of positive anti-plug symmetrical relations
MIC/ ground connects pin and the 2nd MIC/ ground connects pin.MIC/ mentioned here ground connects pin
Being meant that, microphone chip is only connected with end side by both threads, and one is earth lead, separately
One is the transmission line of DC supply input signal for transmitting superposition the first simulated audio signal
(MIC signal transmssion line can be referred to as, output is the second simulated audio signal), but by
In the probability of positive anti-plug, this both threads is connected pin with a MIC/ ground and the 2nd MIC/ ground connects
The corresponding relation of pin there may be change, and the i.e. the oneth MIC/ ground connects pin and the 2nd MIC/ ground connects
Connect pin and the most likely meet the GND of microphone chip, it is also possible to connect MIC signal transmssion line.
Correspondingly, in described end side, described DC source is that Mike's modulus of end side processes mould
The MICBIAS signal of block output, it is defeated that described Mike's modulus processing module has MICBIAS signal
Go out end, MIC+ input, MIC-input, described first resistance and described secondary signal outfan
It is two,
Described MIC+ input is connected pin with a described MIC/ ground and described 2nd MIC/ ground connects
Connect pin one of them connect, described MIC-input with described oneth MIC/ be connected pin and
Described 2nd MIC/ ground connects another connection in pin,
One end of said two the first resistance is all connected, wherein with described MICBIAS signal output part
The other end of one the first resistance is connected pin and described 2nd MIC/ ground with a described MIC/ ground
One of them connects formation First Line section, the other end of another the first resistance and institute to connect pin
Another connect pin and described 2nd MIC/ with stating a MIC/ connected in pin connects shape
Become the second part of path,
Said two secondary signal outfan one of them be arranged on described First Line section, and with
Described MIC+ input connects, and another one secondary signal outfan is arranged on described second part of path
On, and be connected with described MIC-input；
In described Mike's chip side, described DC supply input is connected with a described MIC/ ground and draws
Foot and described 2nd MIC/ ground connect one of them connection of pin, described earth terminal and described first
MIC/ ground connects another connection in pin and described 2nd MIC/ ground connection pin.
Based on the circuit structure diagram shown in Fig. 6, it is provided with at difference in Mike's ADC processing module
Reason module, for the signal of MIC+ input and described MIC-input is carried out difference processing,
Obtain described second simulated audio signal.In the present embodiment, the processing mode of differential signal is used
Process the input signal of MIC+_INPUT and MIC-_INPUT, will MIC+_INPUT
Carry out difference processing with the input signal of MIC-_INPUT, thus obtain the of the output of MIC chip
Two simulated audio signals.Principle based on difference processing, no matter MIC+_INPUT and
Which port of MIC-_INPUT inputs the second simulated audio signal, which port input grounding signal,
All can obtain the second simulated audio signal.
The most preferably, above-mentioned interface module is TYPE-C interface, and the most described MIC/ ground is even
Connecing pin is SBU1 pin, and it is SBU2 pin that described 2nd MIC/ ground connects pin.TYPE-C
One of characteristic of interface can adapt to positive anti-plug exactly, and SBU1 and SBU2 can as with MIC
Chip carries out the pin of interface, SBU1 and SBU2 pin is at TYPE-C interface physically
State the distribution that is centrosymmetric.
Embodiment four
Microphone circuit in above-described embodiment can be arranged in earphone, as a part for earphone.
In the case of application TYPE-C interface, the audio signal of the left and right acoustic channels of earphone can be passed through
Two pins of DP and DN of TYPE-C interface carry out signal transmission.
Additionally, above-mentioned microphone circuit or above-mentioned earphone can constitute one together with terminal
Microphone circuit system, thus realize microphone signal and produce from MIC chip, then it is added to
In DC supply input signal, output is to end side, then is entered by Mike's modulus processing module of end side
Row extraction process, thus store in the terminal or play.
One of ordinary skill in the art will appreciate that: realize the whole of above-mentioned each method embodiment
Or part steps can be completed by the hardware that programmed instruction is relevant.Aforesaid program is permissible
It is stored in a computer read/write memory medium.This program upon execution, performs to include
State the step of each method embodiment；And aforesaid storage medium includes: ROM, RAM, magnetic
The various medium that can store program code such as dish or CD.
It is last it is noted that various embodiments above is only in order to illustrate technical scheme,
It is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments,
It will be understood by those within the art that: foregoing embodiments still can be remembered by it
The technical scheme carried is modified, or carries out the most some or all of technical characteristic
With replacing；And these amendments or replacement, do not make the essence of appropriate technical solution depart from this
Invent the scope of each embodiment technical scheme.
Claims (14)
1. a microphone circuit, it is characterised in that including: Mike's chip and circuit for signal conditioning, described Mike's chip has DC supply input, the first signal output part and the earth terminal being connected to ground,
Described circuit for signal conditioning is connected between described first signal output part and ground, make to constitute AC signal path between described first signal output part and described ground, export on the DC supply input signal of described DC supply input that the first simulated audio signal of described first signal output part output is added to.
Microphone circuit the most according to claim 1, it is characterised in that described circuit for signal conditioning includes filter circuit,
One end of described filter circuit is connected with described first signal output part, other end ground connection, and the bandpass range of described filter circuit is the scope of sound frequency.
Microphone circuit the most according to claim 2, it is characterised in that also include the first resistance,
One end of described first resistance connects described DC supply input, the other end connects DC source, it is provided with secondary signal outfan, the second simulated audio signal after outwards exporting described first simulated audio signal and described DC supply input Signal averaging between described first resistance and described DC supply input.
Microphone circuit the most according to claim 3, it is characterized in that, described circuit for signal conditioning also includes the second resistance, one end of described second resistance is connected with described first signal output part, other end ground connection, described second resistance is for regulating the DC point of described second simulated audio signal.
Microphone circuit the most according to claim 4, it is characterized in that, the resistance of described first resistance and described second resistance meets the condition making the amplitude fluctuations scope of described second simulated audio signal be between output voltage and the ground voltage of described DC source.
Microphone circuit the most according to claim 3, it is characterised in that be positioned at end side at described secondary signal outfan, arranges interface module between the DC supply input of described secondary signal outfan and described Mike's chip.
Microphone circuit the most according to claim 6, it is characterized in that, described end side is provided with Mike's modulus processing module, described Mike's modulus processing module includes MICBIAS signal output part and Mike's signal input part, described DC source is the MICBIAS signal of MICBIAS signal output part output, one end of described first resistance is connected with described MICBIAS signal output part, the other end is connected by the DC supply input of described interface module with described Mike's chip, and described secondary signal outfan is connected with described Mike's signal input part.
Microphone circuit the most according to claim 6, it is characterised in that described interface module is the interface module having and adapting to positive and negative inserting structure.
Microphone circuit the most according to claim 8, it is characterised in that described interface module have on position have positive anti-plug symmetrical relations a MIC/ connect pin with connecting pin and the 2nd MIC/,
In described end side, described DC source is the MICBIAS signal of Mike's modulus processing module output of end side, described Mike's modulus processing module has MICBIAS signal output part, MIC+ input, MIC-input, described first resistance and described secondary signal outfan and is two
Described MIC+ input and with being connected pin and described 2nd MIC/ one of them connection of connection pin of a described MIC/ ground, described MIC-input is connected another connection in pin and described 2nd MIC/ ground connection pin with a described MIC/ ground,
One end of said two the first resistance is all connected with described MICBIAS signal output part, the other end of one of them the first resistance is connected pin with a described MIC/ ground and described 2nd MIC/ ground connects one of them connection of pin and forms First Line section, another connection that the other end of another the first resistance is connected in pin and described 2nd MIC/ ground connection pin with a described MIC/ ground forms second part of path
Said two secondary signal outfan one of them be arranged on described First Line section, and be connected with described MIC+ input, another one secondary signal outfan is arranged on described second part of path, and is connected with described MIC-input；
In described Mike's chip side, described DC supply input and with being connected pin and described 2nd MIC/ one of them connection of connection pin of a described MIC/ ground, described earth terminal is connected another connection in pin and described 2nd MIC/ ground connection pin with a described MIC/ ground.
Microphone circuit the most according to claim 9, it is characterized in that, also include the differential processing module being arranged in Mike's modulus processing module, for the signal of MIC+ input and described MIC-input is carried out difference processing, obtain described second simulated audio signal.
11. microphone circuits according to claim 9, it is characterised in that described interface module is TYPE-C interface, it is SBU1 pin that a described MIC/ ground connects pin, and it is SBU2 pin that described 2nd MIC/ ground connects pin.
12. microphone circuits according to claim 1, it is characterised in that described Mike's chip is MEMS-type Mike's chip.
13. 1 kinds of earphones, it is characterised in that include, the microphone circuit as described in claim 1 to 11 is arbitrary.
14. 1 kinds of microphone circuit systems, it is characterised in that including: terminal and the microphone circuit as described in claim 1 to 11 is arbitrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610249272.4A CN105872904A (en) | 2016-04-20 | 2016-04-20 | Microphone circuit, system and headset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610249272.4A CN105872904A (en) | 2016-04-20 | 2016-04-20 | Microphone circuit, system and headset |
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| CN105872904A true CN105872904A (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610249272.4A Pending CN105872904A (en) | 2016-04-20 | 2016-04-20 | Microphone circuit, system and headset |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108268394A (en) * | 2016-12-30 | 2018-07-10 | 维沃移动通信有限公司 | The processing method and mobile terminal of a kind of access device |
| CN108268397A (en) * | 2016-12-30 | 2018-07-10 | 维沃移动通信有限公司 | The processing method and mobile terminal of a kind of access device |
| CN108268407A (en) * | 2016-12-30 | 2018-07-10 | 维沃移动通信有限公司 | The processing method and mobile terminal of a kind of access device |
| CN108268410A (en) * | 2016-12-30 | 2018-07-10 | 维沃移动通信有限公司 | A kind of method and mobile terminal of data communication |
| CN108268396A (en) * | 2016-12-30 | 2018-07-10 | 维沃移动通信有限公司 | The processing method and mobile terminal of a kind of access device |
| CN109918041A (en) * | 2019-03-15 | 2019-06-21 | 维沃移动通信有限公司 | A kind of voicefrequency circuit, relevant device and control method |
| CN110290447A (en) * | 2019-07-05 | 2019-09-27 | 深圳市中科蓝讯科技有限公司 | Direct current biasing unit, microphone works circuit and microphone control chip |
| CN110324770A (en) * | 2019-08-01 | 2019-10-11 | 迈感微电子(上海)有限公司 | A kind of microphone and its integrated circuit, electronic equipment |
| CN110783777A (en) * | 2018-07-12 | 2020-02-11 | 中兴通讯股份有限公司 | Anti-interference method, device and system |
| CN113784257A (en) * | 2021-09-08 | 2021-12-10 | 深圳市长丰影像器材有限公司 | Multifunctional microphone |
| WO2024088208A1 (en) * | 2022-10-27 | 2024-05-02 | 维沃移动通信有限公司 | Electronic device and electronic device assembly |
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| CN108268396B (en) * | 2016-12-30 | 2020-01-03 | 维沃移动通信有限公司 | Processing method of access equipment and mobile terminal |
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| EP3940525A4 (en) * | 2019-03-15 | 2022-05-04 | Vivo Mobile Communication Co., Ltd. | Audio circuit, related device and control method |
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| CN110324770A (en) * | 2019-08-01 | 2019-10-11 | 迈感微电子(上海)有限公司 | A kind of microphone and its integrated circuit, electronic equipment |
| CN110324770B (en) * | 2019-08-01 | 2024-04-26 | 迈感微电子(上海)有限公司 | Microphone, integrated circuit thereof and electronic equipment |
| CN113784257A (en) * | 2021-09-08 | 2021-12-10 | 深圳市长丰影像器材有限公司 | Multifunctional microphone |
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