CN103813237B - Extensible pick-up with mute function and implementing method thereof - Google Patents
Extensible pick-up with mute function and implementing method thereof Download PDFInfo
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- CN103813237B CN103813237B CN201410054369.0A CN201410054369A CN103813237B CN 103813237 B CN103813237 B CN 103813237B CN 201410054369 A CN201410054369 A CN 201410054369A CN 103813237 B CN103813237 B CN 103813237B
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Abstract
The invention discloses an extensible pick-up with a mute function. A microphone is connected with an audio amplification filter circuit, the audio amplification filter circuit is connected with a single-end to difference circuit, the single-end to difference circuit is connected with a difference to single-end circuit through an analog difference signal line, the difference to single-end circuit is connected with an analog-digital conversion circuit, and the analog-digital conversion circuit is connected with a main control chip; a mute press button is connected with a second microprogrammed control unit (MCU), the second MCU is connected with a second digital signal producing circuit, the second digital signal producing circuit is connected with a first digital signal receiving circuit through the analog difference signal line, the first digital signal receiving circuit is connected with a first MCU, and the first MCU is connected with the main control chip; the first MCU is connected with a first digital signal producing circuit, the first digital signal producing circuit is connected with a second digital signal receiving circuit through the analog difference signal line, and the second digital signal receiving circuit is connected with the second MCU; thereby, digital control signal communication is reliable, and audio signal transmission anti-interference is high.
Description
Technical field
The present invention relates to a kind of extension pick up with mute function and its implementation.
Background technology
In prior art, the implementation for extending pick up mute function is generally：Believed by audio frequency on audio transmission line
The change of number direct current biasing is representing mute signal and extension wheat（Extension pick up）Plugged/unplugged status.Specially：Work as expansion
Exhibition wheat is connected to main frame（Main frame includes but are not limited to conference telephone）When upper, the direct current that main frame can detect audio signal is inclined
Put；When wheat disconnection and the connection of main frame is extended, without direct current biasing；When extension wheat is connected with main frame, press on extension wheat
Mute button, direct current biasing are directly moved to low level by button, send a low level pulse to main frame equivalent to extension wheat
Signal is representing quiet.
However, the defect that the implementation of pick up mute function is extended in prior art is：One, when user's long-time
When pinning the mute key of extension wheat, direct current biasing can be always maintained at low level, and now main frame can think that extension wheat is disconnected connection；
Two, it is insecure to transmit by single pulse signal, main frame may the missing inspection extension pulse signal that sends of wheat, and then
Occur that user presses mute key, quiet display lamp is bright on extension wheat, and main frame does not but have quiet situation.
The content of the invention
It is an object of the invention to provide a kind of extension pick up with mute function and its implementation, solve length and press
Mute key and main frame think that extension wheat disconnects, and missing inspection pulse signal, press mute key, quiet display lamp on extension wheat
It is bright, and main frame does not have quiet technical problem.
To reach above-mentioned purpose, the solution of the present invention is：
A kind of extension pick up with mute function, is made up of extension wheat and main frame, extension wheat by power line,
A piece ground wire and two analog difference signal lines are connected with main frame；Wherein, main frame includes that main control chip, a MCU, modulus turn
Change, differential-to-single-ended circuit, the first digital signal produce circuit and the first digital signal receiving circuit；Extension wheat includes Mike
Wind, audio frequency filtering and amplifying circuit, single-ended transfer difference circuit, the second digital signal produce circuit, the second digital signal receiving circuit,
2nd MCU and mute button；Mike is connected with audio frequency filtering and amplifying circuit, and audio frequency filtering and amplifying circuit is electric with single-ended transfer difference
Road connects, and single-ended transfer difference circuit is connected with differential-to-single-ended circuit by analog difference signal line, differential-to-single-ended circuit and
Analog digital conversion connects, and analog digital conversion is connected with main control chip；Mute button is connected with the 2nd MCU, the numeral letters of the 2nd MCU and second
Number circuit connection is produced, the second digital signal produces circuit by analog difference signal line and the first digital signal receiving circuit company
Connect, the first digital signal receiving circuit is connected with a MCU, a MCU is connected with main control chip；First MCU is digital with first
Signal generating circuit connects, and the first digital signal produces circuit and passes through analog difference signal line and the second digital signal receiving circuit
Connection, the second digital signal receiving circuit are connected with the 2nd MCU；
Filtering is amplified by audio frequency filtering and amplifying circuit after mike pickup audio signal, single-ended transfer difference circuit will
After single-ended audio signal is converted into differential analog signal, transmitted to differential-to-single-ended circuit by analog difference signal line, after
Main control chip is transferred to through analog digital conversion；
Mute button, the 2nd MCU detection mute buttons are pressed, and produces pulse signal, pulse signal is digital by second
Signal generating circuit produces audio frequency differential signal, and is transferred to the first digital signal receiving circuit by analog difference signal line,
Direct current biasing is obtained, DC bias signal is transferred to into a MCU, the pulsewidth of MCU detection direct current biasings is simultaneously transferred to master
Control chip；
First MCU produces pulse signal, produces circuit by the first digital signal and produces audio frequency differential signal, and passes through mould
Intend differential signal line and be transferred to the second digital signal receiving circuit, and detect the arteries and veins comprising direct current biasing in audio frequency differential signal
It is wide.
Further, first digital signal produces circuit includes two NPN triodes and a resistance R1, two NPN triodes
Base stage parallel connection after connect with resistance R1, resistance R1 is connected with a MCU, and the emitter stage of two NPN triodes is grounded respectively, and two
The colelctor electrode of NPN triode connects analog difference signal line respectively.
Further, first digital signal receiving circuit includes the resistance R2 and resistance R3 of two equivalences；Resistance R2 and electricity
Resistance R3 parallel connection the first MCU of latter termination, the other end connect analog difference signal line respectively.
Further, second digital signal produces circuit includes two NPN triodes and a resistance R4, two NPN triodes
Base stage parallel connection after connect with resistance R4, resistance R4 is connected with the 2nd MCU, and the emitter stage of two NPN triodes is grounded respectively, and two
The colelctor electrode of NPN triode connects analog difference signal line respectively.
Further, second digital signal receiving circuit includes the resistance R5 and resistance R6 of two equivalences；Resistance R5 and electricity
Resistance R6 parallel connection the 2nd MCU of latter termination, the other end connect analog difference signal line respectively.
A kind of quiet implementation method of extension pick up with mute function, comprises the following steps：
Step one, extension wheat are quiet：Under the talking state of main frame, the mute button of extension wheat is pressed, and the 2nd MCU is produced
Pulse signal of the pulsewidth for W1, Host Detection to the pulse signal then carry out mute operation, and return a pulsewidth be W2 really
Recognizing pulse signal, wheat harvest only being extended to the confirmation pulse signal, whole quiet process just terminates；When main frame missing inspection extension wheat sends out
The quiet pulse signal for going out, when extension wheat does not receive the confirmation pulse signal in the given time, wheat will send again for extension
Quiet pulse signal of the pulsewidth for W1, until main frame is returned confirms pulse signal；
Step 2, DE-mute：The mute button of extension wheat is pressed, the 2nd MCU produces pulse signal of the pulsewidth for W3, main
Machine examination measures the pulse signal and then carries out DE-mute operation, and returns the confirmation pulse signal that a pulsewidth is W2, only expands
Wheat harvest is opened up to the confirmation pulse signal, whole DE-mute process just terminates；When main frame missing inspection extends the DE-mute that wheat sends
Pulse signal, when extension wheat does not receive the confirmation pulse signal in the given time, extension wheat will send pulsewidth again for W3
DE-mute pulse signal, until main frame return confirm pulse signal；
Step 3, extension wheat are inserted and extract detecting step：When Host Detection direct current biasing then extends wheat in slotting for high
Enter state；When Host Detection to direct current biasing keeps maximum of the low level time more than W1, W2 and W3, then extend wheat and pull out
Go out.
After such scheme, the present invention solves the long main frame by mute key and thinks that extension wheat disconnects, and leakage
Inspection pulse signal, presses mute key, and on extension wheat, quiet display lamp is bright, and main frame does not have quiet technical problem；Make total
Word control signal reliable communications and real-time is good, and realize the differential transfer of simulated audio signal, strong antijamming capability.
Description of the drawings
Fig. 1 is present configuration block diagram；
Fig. 2 is circuit diagram of the present invention；
Fig. 3 is that the present invention takes out direct current biasing schematic diagram from difference audio signal；
Fig. 4 is present invention extension wheat mute operation flow chart；
Fig. 5 is that present invention extension wheat cancels mute operation flow chart；
It is audio signal oscillogram that Fig. 6 is main frame missing inspection mute signal of the present invention；
Fig. 7 is that main frame of the present invention and extension wheat obtain direct current biasing oscillogram.
Label declaration
Extension 1 mike 11 of wheat
12 single-ended transfer difference circuit 13 of audio frequency filtering and amplifying circuit
Second digital signal produces 14 second digital signal receiving circuit 15 of circuit
17 main frame 2 of 2nd MCU16 and mute button
The MCU22 of main control chip 21
23 differential-to-single-ended circuit 24 of analog digital conversion
First digital signal produces 25 first digital signal receiving circuit 26 of circuit.
Specific embodiment
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
Refering to shown in Fig. 1 to Fig. 7, a kind of extension pick up with mute function that the present invention is disclosed, by extension wheat 1 and
Main frame 2 is constituted, as shown in figure 1, main frame includes but are not limited to conference telephone, extension wheat 1 passes through power line, a ground wire
And two analog difference signal lines are connected with main frame 2, as shown in figure 1, wherein, main frame 2 include main control chip 21, a MCU22,
Analog digital conversion 23, differential-to-single-ended circuit 24, the first digital signal produce circuit 25 and the first digital signal receiving circuit 26；Expand
Exhibition wheat 1 include mike 11, audio frequency filtering and amplifying circuit 12, single-ended transfer difference circuit 13, the second digital signal produce circuit 14,
Second digital signal receiving circuit 15, the 2nd MCU16 and mute button 17.
Mike 11 is connected with audio frequency filtering and amplifying circuit 12, audio frequency filtering and amplifying circuit 12 and single-ended transfer difference circuit 13
Connection, single-ended transfer difference circuit 13 are connected with differential-to-single-ended circuit 24 by analog difference signal line, differential-to-single-ended circuit
24 are connected with analog digital conversion 23, and analog digital conversion 23 is connected with main control chip 21.
Filtering, single-ended transfer difference electricity are amplified by audio frequency filtering and amplifying circuit 12 after the pickup audio signal of mike 11
Road 13 is converted into single-ended audio signal after differential analog signal, is transmitted to difference by analog difference signal line and turns single-ended electricity
Road 24, after be transferred to main control chip 21 through analog digital conversion 23.
Mute button 17 is connected with the 2nd MCU16, and the 2nd MCU16 produces circuit 14 with the second digital signal and is connected, and second
Digital signal is produced circuit 14 and is connected with the first digital signal receiving circuit 26 by analog difference signal line, the first digital signal
Receiving circuit 26 is connected with a MCU22, and a MCU22 is connected with main control chip 21.
Mute button 17, the 2nd MCU16 detection mute buttons are pressed, and produces pulse signal, pulse signal passes through second
Digital signal produces circuit 14 and produces audio frequency differential signal, and is transferred to the first digital signal reception by analog difference signal line
Circuit 26, obtains direct current biasing, and DC bias signal is transferred to a MCU22, and a MCU22 detects the pulsewidth of direct current biasing
And main control chip 21 is transferred to, as shown in figure 4, direct current biasing oscillogram is taken out from difference audio signal.
First MCU22 produces circuit 25 with the first digital signal and is connected, and the first digital signal produces circuit 25 by simulation
Differential signal line is connected with the second digital signal receiving circuit 15, and the second digital signal receiving circuit 15 is connected with the 2nd MCU16.
First MCU22 produces pulse signal, produces circuit 25 by the first digital signal and produces audio frequency differential signal, and leads to
Cross analog difference signal line and be transferred to the second digital signal receiving circuit 25, and direct current biasing is included in detecting audio frequency differential signal
Pulsewidth.
In the present embodiment, as shown in Fig. 2 first digital signal produce circuit 25 include two NPN triode Q1s, Q2 and
One resistance R1, is connected with resistance R1 after two NPN triode Q1s, the base stage parallel connection of Q2, and resistance R1 is connected with a MCU22, two NPN
The emitter stage of audion Q1, Q2 is grounded respectively, and the colelctor electrode of two NPN triode Q1s, Q2 connects analog difference signal line respectively.Institute
State the first digital signal and produce that 25 structure of circuit is relatively simple, cost-effective, certainly, the first digital signal produces circuit 25 can be with
For other structures.
In the present embodiment, as shown in Fig. 2 first digital signal receiving circuit 26 includes the resistance R2 and electricity of two equivalences
Resistance R3；Resistance R2 the first MCU22 of latter termination in parallel with resistance R3, the other end connect analog difference signal line respectively.Described first
26 structure of digital signal receiving circuit is relatively simple, cost-effective, and certainly, the first digital signal receiving circuit 26 can be other
Structure.
In the present embodiment, as shown in Fig. 2 second digital signal produce circuit 14 include two NPN triodes Q3, Q4 and
One resistance R4, is connected with resistance R4 after the base stage parallel connection of two NPN triodes, and resistance R4 is connected with the 2nd MCU16, two NPN, tri- poles
The emitter stage of pipe Q3, Q4 is grounded respectively, and the colelctor electrode of two NPN triodes Q3, Q4 connects analog difference signal line respectively.Described
Two digital signal generation 14 structure of circuit is relatively simple, cost-effective, and certainly, it can be which that the second digital signal produces circuit 14
Its structure.
In the present embodiment, as shown in Fig. 2 second digital signal receiving circuit 15 includes the resistance R5 and electricity of two equivalences
Resistance R6；Resistance R5 the 2nd MCU16 of latter termination in parallel with resistance R6, the other end connect analog difference signal line respectively.Described second
15 structure of digital signal receiving circuit is relatively simple, cost-effective, and certainly, the second digital signal receiving circuit 15 can be other
Structure.
Invention additionally discloses a kind of quiet implementation method of extension pick up with mute function, comprises the following steps：
Step one, as shown in figure 4, extension wheat is quiet：Under the talking state of main frame 2, the mute button of extension wheat 1 is pressed
17, the 2nd MCU16 produce pulse signal of the pulsewidth for W1, and main frame 2 detects the pulse signal and then carries out mute operation, and returns
Confirmation pulse signal of one pulsewidth for W2, only extends wheat 1 and receives the confirmation pulse signal, and whole quiet process just terminates,
Obtain direct current biasing oscillogram as shown in Figure 7；When 2 missing inspection of main frame extends the quiet pulse signal that wheat 1 sends, extension wheat 1 is pre-
Fix time it is interior extend wheat 1 and sent the quiet pulse signal that pulsewidth is W1 again when not receiving the confirmation pulse signal, until
Main frame 2 is returned and confirms pulse signal, and 2 missing inspection mute signal of main frame is that audio signal oscillogram is as shown in Figure 6.
Step 2, as shown in figure 5, DE-mute：The mute button 17 of extension wheat 1 is pressed, the 2nd MCU16 produces pulsewidth and is
The pulse signal of W3, main frame 2 detect the pulse signal and then carry out DE-mute operation, and return the confirmation that a pulsewidth is W2
Pulse signal, only extends wheat 1 and receives the confirmation pulse signal, and whole DE-mute process just terminates；When 2 missing inspection of main frame extends
The DE-mute pulse signal that wheat 1 sends, when extension wheat 1 does not receive the confirmation pulse signal in the given time, extends wheat 1
The DE-mute pulse signal that pulsewidth is W3 is sent again, until main frame 2 is returned confirms pulse signal.
Step 3, extension wheat are inserted and extract detecting step：When Host Detection direct current biasing then extends wheat in slotting for high
Enter state；When Host Detection to direct current biasing keeps maximum of the low level time more than W1, W2 and W3, then extend wheat and pull out
Go out.
The present invention solves the long main frame 2 by mute key 17 and thinks that extension wheat 1 disconnects, and missing inspection pulse signal,
Mute key 17 is pressed, quiet display lamp is bright on extension wheat 1, and main frame 2 does not have quiet technical problem；Simultaneously so that numeral
Control signal reliable communications and real-time is good, and realize the differential transfer of simulated audio signal, strong antijamming capability.
Presently preferred embodiments of the present invention is the foregoing is only, not the restriction to this case design, all designs according to this case are closed
The equivalent variations done by key, each fall within the protection domain of this case.
Claims (6)
1. a kind of extension pick up with mute function, it is characterised in that：It is made up of extension wheat and main frame, extension wheat passes through one
Root power line, a ground wire and two analog difference signal lines are connected with main frame；Wherein, main frame include main control chip, first
MCU, analog digital conversion, differential-to-single-ended circuit, the first digital signal produce circuit and the first digital signal receiving circuit；Extension wheat
Circuit, the second digital signal are produced including mike, audio frequency filtering and amplifying circuit, single-ended transfer difference circuit, the second digital signal
Receiving circuit, the 2nd MCU and mute button；Mike is connected with audio frequency filtering and amplifying circuit, audio frequency filtering and amplifying circuit and list
End slip parallel circuit connection, single-ended transfer difference circuit are connected with differential-to-single-ended circuit by analog difference signal line, and difference turns
Single-end circuit is connected with analog digital conversion, and analog digital conversion is connected with main control chip；Mute button is connected with the 2nd MCU, the 2nd MCU with
Second digital signal produces circuit connection, and the second digital signal produces circuit and passes through analog difference signal line and the first digital signal
Receiving circuit connects, and the first digital signal receiving circuit is connected with a MCU, and a MCU is connected with main control chip；First MCU
Circuit is produced with the first digital signal to be connected, the first digital signal produces circuit and passes through analog difference signal line and the second numeral letter
The connection of number receiving circuit, the second digital signal receiving circuit are connected with the 2nd MCU；
Filtering is amplified by audio frequency filtering and amplifying circuit after mike pickup audio signal, single-ended transfer difference circuit will be single-ended
Audio signal be converted into differential analog signal after, transmitted to differential-to-single-ended circuit by analog difference signal line, after through
Analog digital conversion is transferred to main control chip；
Mute button, the 2nd MCU detection mute buttons are pressed, and produces pulse signal, pulse signal passes through the second digital signal
Produce circuit and produce audio frequency differential signal, and the first digital signal receiving circuit is transferred to by analog difference signal line, obtain
DC bias signal is transferred to a MCU by direct current biasing, and the pulsewidth of MCU detection direct current biasings is simultaneously transferred to master control core
Piece；
First MCU produces pulse signal, produces circuit by the first digital signal and produces audio frequency differential signal, and passes through analogue difference
Sub-signal line is transferred to the second digital signal receiving circuit, and detects the pulsewidth comprising direct current biasing in audio frequency differential signal.
2. a kind of extension pick up with mute function as claimed in claim 1, it is characterised in that：The first numeral letter
Number producing circuit includes two NPN triodes and a resistance R1, connects with resistance R1 after the base stage parallel connection of two NPN triodes, resistance
R1 is connected with a MCU, and the emitter stage of two NPN triodes is grounded respectively, and the colelctor electrode of two NPN triodes connects analogue difference respectively
Sub-signal line.
3. a kind of extension pick up with mute function as claimed in claim 1, it is characterised in that：The first numeral letter
Number receiving circuit includes the resistance R2 and resistance R3 of two equivalences；Resistance R2 the first MCU of latter termination in parallel with resistance R3, the other end
Analog difference signal line is connect respectively.
4. a kind of extension pick up with mute function as claimed in claim 1, it is characterised in that：The second numeral letter
Number producing circuit includes two NPN triodes and a resistance R4, connects with resistance R4 after the base stage parallel connection of two NPN triodes, resistance
R4 is connected with the 2nd MCU, and the emitter stage of two NPN triodes is grounded respectively, and the colelctor electrode of two NPN triodes connects analogue difference respectively
Sub-signal line.
5. a kind of extension pick up with mute function as claimed in claim 1, it is characterised in that：The second numeral letter
Number receiving circuit includes the resistance R5 and resistance R6 of two equivalences；Resistance R5 the 2nd MCU of latter termination in parallel with resistance R6, the other end
Analog difference signal line is connect respectively.
6. a kind of quiet implementation method of extension pick up with mute function, it is characterised in that：Comprise the following steps：
Step one, extension wheat are quiet：Under the talking state of main frame, the mute button of extension wheat is pressed, and the 2nd MCU produces pulsewidth
For the pulse signal of W1, Host Detection to the pulse signal then carries out mute operation, and returns the confirmation arteries and veins that a pulsewidth is W2
Signal being rushed, wheat harvest only being extended to the confirmation pulse signal, whole quiet process just terminates；When main frame missing inspection extends what wheat sent
Quiet pulse signal, when extension wheat does not receive the confirmation pulse signal in the given time, extension wheat will send pulsewidth again
For the quiet pulse signal of W1, return up to main frame and confirm pulse signal；
Step 2, DE-mute：The mute button of extension wheat is pressed, the 2nd MCU produces pulse signal of the pulsewidth for W3, main frame inspection
Measuring the pulse signal then carries out DE-mute operation, and returns the confirmation pulse signal that a pulsewidth is W2, only extends wheat
The confirmation pulse signal is received, whole DE-mute process just terminates；When main frame missing inspection extends the DE-mute pulse that wheat sends
Signal, when extension wheat does not receive the confirmation pulse signal in the given time, extends wheat and is sent pulsewidth again for the quiet of W3
Sound cancels pulse signal, until main frame is returned confirms pulse signal；
Step 3, extension wheat are inserted and extract detecting step：When Host Detection direct current biasing then extends wheat in insertion shape for high
State；When Host Detection to direct current biasing keeps maximum of the low level time more than W1, W2 and W3, then extend wheat and extract.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410054369.0A CN103813237B (en) | 2014-02-18 | 2014-02-18 | Extensible pick-up with mute function and implementing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410054369.0A CN103813237B (en) | 2014-02-18 | 2014-02-18 | Extensible pick-up with mute function and implementing method thereof |
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| Publication Number | Publication Date |
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| CN103813237A CN103813237A (en) | 2014-05-21 |
| CN103813237B true CN103813237B (en) | 2017-05-03 |
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ID=50709352
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| CN201410054369.0A Active CN103813237B (en) | 2014-02-18 | 2014-02-18 | Extensible pick-up with mute function and implementing method thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FI126923B (en) * | 2014-09-26 | 2017-08-15 | Genelec Oy | Method and apparatus for detecting a digital audio signal |
| CN113050039B (en) * | 2021-03-10 | 2023-03-07 | 杭州瑞利超声科技有限公司 | Acoustic fluctuation positioning system used in tunnel |
| CN113473296B (en) * | 2021-07-01 | 2024-03-01 | 广东朝阳电子科技股份有限公司 | Control circuit and method for key expansion type wired earphone |
| CN113965853B (en) * | 2021-10-19 | 2024-01-05 | 深圳市广和通无线股份有限公司 | Module device, audio processing method and related device |
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| CN2266851Y (en) * | 1995-09-05 | 1997-11-05 | 声宝股份有限公司 | Wired and multiplex wireless microphone expanding device for audio-video compact disk machine |
| CN1617630A (en) * | 2003-11-13 | 2005-05-18 | 株式会社Suntech电子 | Radio microphone transceiver with voice code control voice silencing function |
| CN203104586U (en) * | 2013-03-14 | 2013-07-31 | 浪潮乐金数字移动通信有限公司 | Mobile communication terminal for realizing induction mute function |
| CN203747982U (en) * | 2014-02-18 | 2014-07-30 | 厦门亿联网络技术股份有限公司 | Expansion pick-up device with mute function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4820434B2 (en) * | 2009-06-08 | 2011-11-24 | レノボ・シンガポール・プライベート・リミテッド | Microphone mute control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2266851Y (en) * | 1995-09-05 | 1997-11-05 | 声宝股份有限公司 | Wired and multiplex wireless microphone expanding device for audio-video compact disk machine |
| CN1617630A (en) * | 2003-11-13 | 2005-05-18 | 株式会社Suntech电子 | Radio microphone transceiver with voice code control voice silencing function |
| CN203104586U (en) * | 2013-03-14 | 2013-07-31 | 浪潮乐金数字移动通信有限公司 | Mobile communication terminal for realizing induction mute function |
| CN203747982U (en) * | 2014-02-18 | 2014-07-30 | 厦门亿联网络技术股份有限公司 | Expansion pick-up device with mute function |
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| CN103813237A (en) | 2014-05-21 |
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