CN203057507U - A-weighted microphone device for double-audio-frequency phone - Google Patents
A-weighted microphone device for double-audio-frequency phone Download PDFInfo
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- CN203057507U CN203057507U CN 201220632549 CN201220632549U CN203057507U CN 203057507 U CN203057507 U CN 203057507U CN 201220632549 CN201220632549 CN 201220632549 CN 201220632549 U CN201220632549 U CN 201220632549U CN 203057507 U CN203057507 U CN 203057507U
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Abstract
The utility model provides an A-weighted microphone device for a double-audio-frequency phone. The A-weighted microphone device comprises an electret microphone, wherein the electret microphone is provided with an A-weighted filter network and used for converting picked sound signals into electrical signals, amplifying the electrical signals, and inputting the electrical signals to the A-weighted filter network, and the A-weighted filter network is used for filtering out noises. The A-weighted microphone device provided by the utility model has the advantage that the problems of large noise and poor interference resistance of the double-audio-frequency phone are solved.
Description
Technical field
The utility model relates to the microphone field, is specifically related to a kind of double-tone phone A weighted microphone arrangement frequently.
Background technology
What the dual tone phone cleaner handgrip used at present is common microphone, this phone is mainly used in office, family and environment such as outdoor, requiring the microphone pickup frequency band of this kind phone is 300 ~ 3.4KHz, and must have very strong anti-noise and anti-high and low frequency interference performance, but microphone performance in these areas is often not good.
Weighting network generally has three kinds of A, B, C.A-weighted sound level be anthropomorphic dummy's ear to the frequency characteristic of the following low-intensity noise of 55dB, B weighted sound level be simulation 55dB to the frequency characteristic of the moderate noise of 85dB, C weighted sound level is to simulate the frequency characteristic of high intensity noise.Three's main difference is the attenuation degree to the noise low-frequency component, and the A decay is maximum, and B takes second place, and C is minimum.A-weighted sound level is because its characteristic curve close to the sense of hearing characteristic of people's ear, therefore is most widely used a kind of in the noise testing in the world at present, and B, C gradually need not.
As shown in Figure 1, be the circuit theory diagrams of A weighted filter network in the prior art.The A weighting network is made of passive high-pass filtering and active low-pass filter two parts, calculates and debugging related peripheral component parameters, makes its amplitude-frequency characteristic close with A weighted curve.
As shown in Figure 2, be microphone schematic diagram in the prior art, the electret monomer is converted to the voice signal that picks up and is transferred to field effect transistor (JFET) behind the signal of telecommunication and amplifies, and then is input to subsequent client; Capacitor C 1, C2 are in order to anti-radio frequency interference.The restriction of structure makes traditional microphones itself not have noise reduction capability.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of double-tone phone A weighted microphone arrangement frequently, and it is big to have solved dual tone phone machine noise, the problem of poor anti jamming capability.
Technical scheme is as follows:
A kind of double-tone phone frequently comprises electret microphone with A weighted microphone arrangement, and described electret microphone is provided with A weighted filter network; The voice signal that described electret microphone will pick up is converted to the signal of telecommunication and amplifies, and is input to described A weighted filter network, and described A weighted filter network is used for filtering noise.
Further: comprise circuit board unit, energy conversion unit, shell and A weighted filter network unit, described circuit board unit, energy conversion unit and A weighted filter network unit are arranged in the described shell, and described A weighted filter network is arranged in the described A weighted filter network unit; Wherein, described energy conversion unit is transferred to described circuit board unit after the voice signal that picks up is converted to the signal of telecommunication; Described circuit board unit is transferred to described A weighted filter network unit after the described signal of telecommunication is amplified.
Further: described shell comprises bottom, sidewall, opening and spreads on the Air Filter of lower surface; Described opening part is provided with the wiredrawn edge for fixing described circuit board unit, and described outer casing bottom has sound hole.
Further: described circuit board unit is arranged on the top of described shell, and described circuit board unit comprises circuit board, field effect transistor and auxiliary electron element, and described field effect transistor and auxiliary electron element are positioned at the inboard of circuit board.
Further: described energy conversion unit is fixed between the bottom and described circuit board unit of described shell; Described energy conversion unit comprises back pole plate, vibrating diaphragm, pad, zona, polar ring and cavity; Isolate with pad between described back pole plate and the described vibrating diaphragm; Described zona is between the bottom of described vibrating diaphragm and described shell; Described polar ring is between described back pole plate and described circuit board; Described cavity is arranged between the inwall of the periphery of described back pole plate and polar ring and described shell.
Further: described back pole plate has the balance through hole, and described balance through hole is for the air pressure of both sides about the described back pole plate of balance and the described vibrating diaphragm.
Further: described A weighted filter network unit comprises described A weighted filter network and signal output part; Described A weighted filter network is arranged on the inboard of described circuit board, and described signal output part is arranged on the outside of described circuit board.
Compared with prior art, the utlity model has following advantage:
1, in the utility model, thereby improve the sound quality that electret picks up by adding A weighted filter network, noise reduction and elimination low-and high-frequency are disturbed, and it is big to have solved dual tone phone machine noise, the problem of poor anti jamming capability.
2, in the utility model, through the signal that A weighted filter network was handled, more meet the auditory properties of people's ear.
3, adopt installation cost of the present utility model cheap, mature production technology, and dependable performance.
Description of drawings
Fig. 1 is the circuit theory diagrams of A weighted filter network in the prior art;
Fig. 2 is microphone schematic diagram in the prior art;
Fig. 3 is the circuit theory diagrams that double-tone frequency phone is used A weighted microphone arrangement in the utility model;
Fig. 4 is the structure chart that double-tone frequency phone is used A weighted microphone arrangement in the utility model.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Technical solutions of the utility model are suitable for all microphones, and preferred embodiment uses the microphone construction of omnidirectional to do and illustrates, but thinking and method are applicable to various types of microphone.
As shown in Figure 3, be the circuit theory diagrams that double-tone frequency phone is used A weighted microphone arrangement in the utility model.The utility model improves original electret microphone, adds A weighted filter network 41 to it.When picking up voice signal, electret microphone is input to A weighted filter network through conversion and after amplifying, 41 pairs of signals of telecommunication that receive of A weighted filter network carry out filtering noise to be handled, make that the output frequency response is A weighted curve, so not only can filtering noise, and the voice signal that obtains more meets the auditory properties of people's ear.
As shown in Figure 4, be the structure chart that double-tone frequency phone is used A weighted microphone arrangement in the utility model.Double-tone frequency phone comprises with the structure of A weighted microphone arrangement: circuit board unit 1, energy conversion unit 2, shell 3 and A weighted filter network unit 4.
The signal of telecommunication that circuit board unit 1 is used for energy conversion unit 2 is changed out amplifies, circuit board unit 1 is arranged on the top of shell 3, circuit board unit 1 comprises circuit board 10, field effect transistor and auxiliary electron element 11, and field effect transistor and auxiliary electron element 11 are positioned at the inboard of circuit board 10 usually.
A weighted filter network unit 4 is used for that the signal of telecommunication that circuit board unit 1 amplifies is carried out filtering to be handled, and filtering noise and reduction are disturbed, and A weighted filter network unit 4 comprises A weighted filter network 41 and signal output part 40.A weighted filter network 41 is arranged on the inboard of circuit board 10, and signal output part 40 is arranged on the outside of circuit board 10.Signal output part 40 is used for the sound signal of telecommunication that A weighted filter network 41 is handled is outputed to subsequent client, and in this embodiment, signal output part 40 adopts pad or pin.Double-tone of the present utility model is used A weighted microphone arrangement frequently, owing to added A weighted filter network unit 4, the signal of telecommunication after circuit board unit 1 amplification is further handled through the filtering of A weighted filter network unit 4, reduce noise and anti-interference aspect embody extremely strong advantage, and with low cost, technical maturity, dependable performance.
Claims (7)
1. a double-tone frequency phone comprises electret microphone with A weighted microphone arrangement, and it is characterized in that: described electret microphone is provided with A weighted filter network; The voice signal that described electret microphone will pick up is converted to the signal of telecommunication and amplifies, and is input to described A weighted filter network, and described A weighted filter network is used for filtering noise.
Double-tone as claimed in claim 1 frequently phone with A weighted microphone arrangement, it is characterized in that: comprise circuit board unit, energy conversion unit, shell and A weighted filter network unit, described circuit board unit, energy conversion unit and A weighted filter network unit are arranged in the described shell, and described A weighted filter network is arranged in the described A weighted filter network unit; Wherein, described energy conversion unit is transferred to described circuit board unit after the voice signal that picks up is converted to the signal of telecommunication; Described circuit board unit is transferred to described A weighted filter network unit after the described signal of telecommunication is amplified.
3. phone is with A weighted microphone arrangement frequently for double-tone as claimed in claim 2, and it is characterized in that: described shell comprises bottom, sidewall, opening and spreads on the Air Filter of lower surface; Described opening part is provided with the wiredrawn edge for fixing described circuit board unit, and described outer casing bottom has sound hole.
Double-tone as claimed in claim 3 frequently phone with A weighted microphone arrangement, it is characterized in that: described circuit board unit is arranged on the top of described shell, described circuit board unit comprises circuit board, field effect transistor and auxiliary electron element, and described field effect transistor and auxiliary electron element are positioned at the inboard of circuit board.
5. phone is with A weighted microphone arrangement frequently for double-tone as claimed in claim 4, and it is characterized in that: described energy conversion unit is fixed between the bottom and described circuit board unit of described shell; Described energy conversion unit comprises back pole plate, vibrating diaphragm, pad, zona, polar ring and cavity; Isolate with pad between described back pole plate and the described vibrating diaphragm; Described zona is between the bottom of described vibrating diaphragm and described shell; Described polar ring is between described back pole plate and described circuit board; Described cavity is arranged between the inwall of the periphery of described back pole plate and polar ring and described shell.
6. phone is with A weighted microphone arrangement frequently for double-tone as claimed in claim 5, and it is characterized in that: described back pole plate has the balance through hole, and described balance through hole is used for the described back pole plate of balance and the described vibrating diaphragm air pressure of both sides up and down.
7. as claim 2 or 5 described double-tones frequency phones A weighted microphone arrangements, it is characterized in that: described A weighted filter network unit comprises described A weighted filter network and signal output part; Described A weighted filter network is arranged on the inboard of described circuit board, and described signal output part is arranged on the outside of described circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220632549 CN203057507U (en) | 2012-11-27 | 2012-11-27 | A-weighted microphone device for double-audio-frequency phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220632549 CN203057507U (en) | 2012-11-27 | 2012-11-27 | A-weighted microphone device for double-audio-frequency phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057507U true CN203057507U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220632549 Expired - Fee Related CN203057507U (en) | 2012-11-27 | 2012-11-27 | A-weighted microphone device for double-audio-frequency phone |
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| CN (1) | CN203057507U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970645A (en) * | 2012-11-27 | 2013-03-13 | 山东共达电声股份有限公司 | A-weighted microphone device for double-audio-frequency phone and noise reduction method thereof |
-
2012
- 2012-11-27 CN CN 201220632549 patent/CN203057507U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970645A (en) * | 2012-11-27 | 2013-03-13 | 山东共达电声股份有限公司 | A-weighted microphone device for double-audio-frequency phone and noise reduction method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261200 No. 68 Fengshan Road, Fangzi District, Weifang City, Shandong Province Patentee after: Gongda Electroacoustics Co., Ltd. Address before: 261200 No. 68 Fengshan Road, Fangzi District, Weifang City, Shandong Province Patentee before: Shandong Gettop Acoustic Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20191127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |