CN207070253U - A kind of mobile terminal, ear-micro phone and its Electret condenser microphone circuit - Google Patents
A kind of mobile terminal, ear-micro phone and its Electret condenser microphone circuit Download PDFInfo
- Publication number
- CN207070253U CN207070253U CN201721050139.2U CN201721050139U CN207070253U CN 207070253 U CN207070253 U CN 207070253U CN 201721050139 U CN201721050139 U CN 201721050139U CN 207070253 U CN207070253 U CN 207070253U
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- CN
- China
- Prior art keywords
- condenser microphone
- electret condenser
- impedance matching
- microphone circuit
- resistor
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
The utility model provides a kind of mobile terminal, ear-micro phone and its Electret condenser microphone circuit, wherein, the Electret condenser microphone circuit includes FET, biasing resistor and impedance matching resistor, one end of the biasing resistor is used to connect power supply, the first end of the impedance matching resistor connects the output end of the FET, second end of the impedance matching resistor connects the other end of the biasing resistor, passes through the second end exports audio signal of the impedance matching resistor.By setting an impedance matching resistor to be matched with FET, pickup ability and the fidelity of Electret condenser microphone circuit are improved.
Description
Technical field
It the utility model is related to audio signal sample field, and in particular to a kind of mobile terminal, ear-micro phone and its electret
Microphone circuit.
Background technology
Because Electret condenser microphone small volume, structure are relatively easy, it is not necessary to increase external dc power supply, used in mobile device
In be widely applied when pickup transmitter.But the output impedance of electret vibrating membrane is up to thousands of K Ω, this just amplifies with audio
The impedance of circuit substantially mismatches, and easily produces the blowout prevention effect of Electret condenser microphone, have impact on the pickup ability of Electret condenser microphone
And fidelity.
Utility model content
The purpose of this utility model is to provide a kind of mobile terminal, ear-micro phone and its Electret condenser microphone circuit, to improve
The pickup ability of Electret condenser microphone and fidelity.
The utility model provides a kind of Electret condenser microphone circuit, including FET, biasing resistor and impedance matching resistor,
One end of the biasing resistor is used to connect power supply, and the first end of the impedance matching resistor connects the output of the FET
End, the second end of the impedance matching resistor connect the other end of the biasing resistor, pass through the of the impedance matching resistor
Two end exports audio signals.
Described Electret condenser microphone circuit, wherein, the resistance of the impedance matching resistor, which is chosen, is operated in FET
The resistance of linearity range.
Described Electret condenser microphone circuit, wherein, the resistance of impedance matching resistor is 1K Ω.
Described Electret condenser microphone circuit, wherein, Electret condenser microphone circuit also includes the first filter circuit, the first filtered electrical
The input on road connects the second end of the impedance matching resistor.
Described Electret condenser microphone circuit, wherein, first filter circuit includes electric capacity, described in one end connection of electric capacity
Second end of impedance matching resistor.
Described Electret condenser microphone circuit, wherein, Electret condenser microphone circuit also includes the second filter circuit, second filter
The input of wave circuit is used to connect power supply, one end of the output end connection biasing resistor of the second filter circuit.
Described Electret condenser microphone circuit, wherein, second filter circuit includes inductance, and one end of the inductance is used for
Connect power supply, one end of the other end connection biasing resistor of inductance.
A kind of ear-micro phone, including earphone and Electret condenser microphone circuit as described above.
A kind of mobile terminal, including body and Electret condenser microphone circuit as described above, the Electret condenser microphone circuit with
The body connection.
Described mobile terminal, wherein, the mobile terminal is mobile phone.
The beneficial effects of the utility model：By setting an impedance matching resistor to be matched with FET, improve and stay
The pickup ability of electret microphone circuit and fidelity.
Brief description of the drawings
Fig. 1 is the circuit diagram of the embodiment of Electret condenser microphone circuit one provided by the utility model；
Fig. 2 is the circuit diagram of another embodiment of Electret condenser microphone circuit provided by the utility model.
Embodiment
Concrete structure of the present utility model is described in detail below in conjunction with the accompanying drawings.
The utility model provides a kind of Electret condenser microphone circuit, in first embodiment as shown in Figure 1, Electret condenser microphone electricity
Road include the first filter circuit 30, FET Q1, biasing resistor R2, impedance matching resistor R1, electret film 10 and with
Electret film 10 forms the metal polar plate 20 of electric capacity.Metal polar plate 20 is connected with FET Q1 grid, electret film
10 are connected with FET Q1 second electrode D and (are grounded).The biasing resistor R2 is FET Q1 biasing resistor.Institute
The one end for stating biasing resistor R2 is used to connect dc source M+.The first end of the impedance matching resistor R1 connects the field-effect
Pipe Q1 output end S, the FET Q1 first electrode S are its output end.The second end of the impedance matching resistor R1
The other end of the biasing resistor R2 is connected, passes through the outside exports audio signal in the second end of the impedance matching resistor R1.Institute
State the electricity of sound that the electric capacity that audio signal is formed by electret film 10 and metal polar plate 20 gathers after acoustic-electric is changed
Signal.
The input of first filter circuit 30 connects the second end of the impedance matching resistor R1, the first filter circuit
30 output end OUT connection external circuits, such as the audio signal processing circuit of mobile phone.After after filtering, the audio letter of output
Number tonequality is more preferable.Further, first filter circuit 30 includes electric capacity C1, and electric capacity C1 one end connects the impedance matching
Resistance R1 the second end, the electric capacity C1 other end are the output end OUT of the first filter circuit 30.
The utility model improves Electret condenser microphone circuit by setting an impedance matching resistor to be matched with FET
Pickup ability and fidelity.
The impedance matching resistor R1 is FET Q1 DC characteristic build-out resistor, and its resistance, which is chosen, makes FET
Q1 is operated in the resistance of linearity range, improves pickup ability and the fidelity of Electret condenser microphone circuit.Preferably, due to electret
FET Q1 particularity in microphone circuit, impedance matching resistor R1 resistance are optimal for 1K Ω.Due to impedance matching resistor
R1 has directly individually corresponded to the operating point of the direct current signal of electret, efficiently solve Electret condenser microphone circuit appearance due to
Electret parameter drift-out and caused noise jamming, environment acoustic jamming and the problem of interfere, ensure that Electret condenser microphone
Steady-working state, the blowout prevention effect of Electret condenser microphone will not be produced, greatly improve Electret condenser microphone pickup ability and
Fidelity, sound quality are significantly improved.
In second embodiment as shown in Figure 2, on the basis of first embodiment, the Electret condenser microphone circuit also includes
Second filter circuit 40, the input of second filter circuit 40 are used to connect power supply M+, the output of the second filter circuit 40
End connection biasing resistor R2 one end.One end that second filter circuit 40 includes inductance L1, the inductance L1 is used to connect
Power supply M+, inductance the L1 other end connection biasing resistor R2 one end.
Further, Electret condenser microphone circuit also includes diode D1, diode D1 negative pole connection biasing resistor R2's
One end, diode D1 plus earth.Diode D1 is voltage-regulator diode, by voltage stabilization in 7.5V.
The utility model also provides a kind of ear-micro phone, including earphone and Electret condenser microphone circuit as described above.Ear-micro phone
The sound of user is gathered by Electret condenser microphone, earphone plays the sound of other side, realizes voice call.Because ear-micro phone is on picking up
The technical characteristic and principle of sound have elaborated in the embodiment of Electret condenser microphone circuit, will not be repeated here.
The utility model also provides a kind of mobile terminal, such as mobile phone, tablet personal computer, Wearable etc., and it includes this
Body and Electret condenser microphone circuit as described above, body include mainboard, and CPU and Electret condenser microphone circuit are arranged on the mainboard
On, Electret condenser microphone circuit is connected with CPU.The sound of user is gathered by Electret condenser microphone.Because mobile terminal is on pickup
Technical characteristic and principle elaborated in the embodiment of Electret condenser microphone circuit, will not be repeated here.
Use above specific case is illustrated to the utility model, is only intended to help and is understood the utility model, and
Not limiting the utility model.For the utility model person of ordinary skill in the field, according to think of of the present utility model
Think, some simple deductions, deformation can also be made or replaced.
Claims (10)
1. a kind of Electret condenser microphone circuit, including FET and biasing resistor, one end of the biasing resistor is used to connect electricity
Source, it is characterised in that also connect the defeated of the FET including impedance matching resistor, the first end of the impedance matching resistor
Go out end, the second end of the impedance matching resistor connects the other end of the biasing resistor, passes through the impedance matching resistor
Second end exports audio signal.
2. Electret condenser microphone circuit according to claim 1, it is characterised in that the resistance of the impedance matching resistor is chosen
FET is set to be operated in the resistance of linearity range.
3. Electret condenser microphone circuit according to claim 1, it is characterised in that the resistance of the impedance matching resistor is 1K
Ω。
4. Electret condenser microphone circuit according to claim 1, it is characterised in that Electret condenser microphone circuit also includes the first filter
Wave circuit, the input of the first filter circuit connect the second end of the impedance matching resistor.
5. Electret condenser microphone circuit according to claim 4, it is characterised in that first filter circuit includes electric capacity,
One end of electric capacity connects the second end of the impedance matching resistor.
6. Electret condenser microphone circuit according to claim 1, it is characterised in that Electret condenser microphone circuit also includes the second filter
Wave circuit, the input of second filter circuit are used to connect power supply, the output end connection biasing resistor of the second filter circuit
One end.
7. Electret condenser microphone circuit according to claim 6, it is characterised in that second filter circuit includes inductance,
One end of the inductance is used to connect power supply, one end of the other end connection biasing resistor of inductance.
8. a kind of ear-micro phone, including earphone, it is characterised in that also include the electret as described in claim 1-7 any one
Microphone circuit.
9. a kind of mobile terminal, including body, it is characterised in that also include the electret as described in claim 1-7 any one
Body microphone circuit, the Electret condenser microphone circuit are connected with the body.
10. mobile terminal according to claim 9, it is characterised in that the mobile terminal is mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721050139.2U CN207070253U (en) | 2017-08-21 | 2017-08-21 | A kind of mobile terminal, ear-micro phone and its Electret condenser microphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721050139.2U CN207070253U (en) | 2017-08-21 | 2017-08-21 | A kind of mobile terminal, ear-micro phone and its Electret condenser microphone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207070253U true CN207070253U (en) | 2018-03-02 |
Family
ID=61514917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721050139.2U Expired - Fee Related CN207070253U (en) | 2017-08-21 | 2017-08-21 | A kind of mobile terminal, ear-micro phone and its Electret condenser microphone circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207070253U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110430497A (en) * | 2019-07-31 | 2019-11-08 | 深圳市睿耳电子有限公司 | A kind of circuit, Radiationproof screening apparatus for back-located antenna mobile telephone and earphone that control microphone is mute |
| CN110931001A (en) * | 2019-09-05 | 2020-03-27 | 新华通讯社 | Anti-noise audio transmission device facing voice recognition |
| CN115459803A (en) * | 2022-08-30 | 2022-12-09 | 陕西烽火电子股份有限公司 | Nationwide voice self-adaptive circuit design |
-
2017
- 2017-08-21 CN CN201721050139.2U patent/CN207070253U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110430497A (en) * | 2019-07-31 | 2019-11-08 | 深圳市睿耳电子有限公司 | A kind of circuit, Radiationproof screening apparatus for back-located antenna mobile telephone and earphone that control microphone is mute |
| CN110931001A (en) * | 2019-09-05 | 2020-03-27 | 新华通讯社 | Anti-noise audio transmission device facing voice recognition |
| CN110931001B (en) * | 2019-09-05 | 2022-05-17 | 新华通讯社 | Anti-noise audio transmission device facing voice recognition |
| CN115459803A (en) * | 2022-08-30 | 2022-12-09 | 陕西烽火电子股份有限公司 | Nationwide voice self-adaptive circuit design |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180302 Termination date: 20180821 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |