CN2582309Y - Hand-free receiver able to eliminate feedback voice and background echo - Google Patents
Hand-free receiver able to eliminate feedback voice and background echo Download PDFInfo
- Publication number
- CN2582309Y CN2582309Y CN 02254990 CN02254990U CN2582309Y CN 2582309 Y CN2582309 Y CN 2582309Y CN 02254990 CN02254990 CN 02254990 CN 02254990 U CN02254990 U CN 02254990U CN 2582309 Y CN2582309 Y CN 2582309Y
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- China
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- circuit
- microphone
- background echo
- hand
- loudspeaker
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- Expired - Fee Related
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Abstract
The utility model relates to a hand-free receiver able to eliminate feedback voice and background echo. A feedback voice and background echo eliminating circuit is arranged between a loudspeaker and a microphone of the hand-free receiver. The eliminating circuit comprises a control circuit and a detection circuit. When the detection circuit detects played sound signals in a playing circuit of the hand-free receiver, the detection circuit can transmit the signals to the control circuit, and the control circuit can change the matching impedance of the microphone of the hand-free receiver immediately to reduce the receiving sensitivity of the microphone so as to reduce the signals of the loudspeaker fed back to the microphone, thus the utility model can avoid harsh howling and background echo from being generated.
Description
Technical field
The utility model is a kind of handfree receiver unit of eliminating the generation of howl back and background echo, refer in particular to a kind of control circuit that utilizes when the horn actuation of Handless, adjust the matched impedance of the microphone of this Handless, to change the sensitivity of microphone, the signal that lowers loudspeaker is feedback in microphone, avoids producing the ear-piercing people's of disturbing whistle and background echo.
Background technology
Consult shown in Figure 4, one end of the Handless 40 of general traditional mobile phone is provided with the plug 41 that lights a cigarette, for the cigarette lighter socket that is plugged on the car, and be provided with circuit in inside, its surperficial 42 inboards, grid hole are provided with loudspeaker again, for playing the other side's sound, on Handless 40, be provided with one than long lead 43 in addition, these lead 43 ends are provided with a connector 44, constitute line for mobile phone 45 grafting, lead 43 is in being provided with a microphone 46 near connector 44 places again, make the user give orders or instructions, play the other side by the loudspeaker on the Handless 40 again and give orders or instructions traditional mobile telephone holding-free receiver by microphone 46, the basic function of HANDS FREE is provided, and its major defect is:
Because traditional mobile telephone holding-free receiver is for taking the distribution simplification into account, microphone 46 and loudspeaker are located in the main body of same Handless, generally used the sound appliances person all to understand, when microphone 46 is too near to loudspeaker, because of microphone 46 is given in the audible warning back coupling, ear-piercing whistle of disturbing the people will be produced, or therefore produce secondary background echo phenomenon by the space back coupling, make the user feel very uncomfortable, therefore, if can development and Design go out a kind of handfree receiver unit of eliminating the generation of howl back and background echo, will be field of Communications problem anxious to be solved.
Summary of the invention
Main purpose of the present utility model provides a kind of handfree receiver unit of eliminating the generation of howl back and background echo, by between the loudspeaker and microphone of Handless, be provided with a whistle and background echo cancellation circuit coupling, this circuit is provided with a control circuit and a circuit for detecting, when circuit for detecting detects the playing sound during signal of broadcast circuit of Handless, can transmit the signal to this control circuit, make this control circuit adjust the matched impedance of the microphone of this Handless, to change the sensitivity of this microphone, reach the signal that lowers loudspeaker and feedback, eliminate producing ear-piercing people's the whistle and the purpose of background echo of disturbing in microphone.
The purpose of this utility model is achieved in that a kind of handfree receiver unit of eliminating the generation of howl back and background echo, and it is characterized in that: it includes a main body; Circuit for detecting is to be located in this main body, and the broadcast circuit in this circuit for detecting and this main body is connected; Control circuit is to be located in this main body, and the microphone in this control circuit and this main body is connected, and joins with this circuit for detecting.
Be provided with an amplifier between this circuit for detecting and this broadcast circuit.Be provided with a switching device between this control circuit and microphone.This switching device can be a relay.Be provided with a photoelectric coupled circuit between the broadcast circuit of this main body and the microphone.
Describe in detail below in conjunction with the preferred embodiment conjunction with figs..
Description of drawings
Fig. 1 is a schematic perspective view of the present utility model.
Fig. 2 is a block schematic diagram of the present utility model.
Fig. 3 is a circuit diagram of the present utility model.
Fig. 4 is the schematic diagram of traditional structure.
Embodiment
Consult Fig. 1-shown in Figure 3, the utility model provides a kind of handfree receiver unit of eliminating the generation of howl back and background echo, this Handless is provided with a main body 10, these main body 10 1 ends are provided with the plug 11 that lights a cigarette, for the cigarette lighter socket that is plugged on the car, and be provided with a circuit 20 in inside, its surperficial mesh 12 inboards are provided with loudspeaker 21 again, for playing the other side's sound, 13 inboards, grid hole on these main body 10 surfaces are provided with a microphone 14 in addition, this main body 10 is provided with a slot 15, has a Port on this slot 15, constitute line for pegging graft with a mobile phone 16, the user can give orders or instructions by this microphone 14, plays the other side by the loudspeaker on the main body 10 21 in addition and gives orders or instructions.
Consult shown in Figure 2, in the utility model, this circuit 20 is between loudspeaker 21 and microphone 14, be provided with a whistle and background echo cancellation circuit coupling 23, this elimination circuit 23 comprises a control circuit 25 and a circuit for detecting 26, wherein this circuit for detecting 26 is connected with the broadcast circuit 22 of this circuit 20, this control circuit 25 then is connected with this microphone 14, make circuit for detecting 26 detect playing sound during signal of this broadcast circuit 22, can transmit the signal to this control circuit 25, make this control circuit 25 adjust the matched impedance of this microphone 14 immediately, to change the sensitivity of this microphone 14, lower the signal back coupling microphone 14 of loudspeaker 21, the whistle and the background echo of avoiding producing the ear-piercing people of disturbing.
Simultaneously, this circuit for detecting 26 and this are play between the circuit 22, are provided with an amplifier 261, make this amplifier 261 scalable signals that play sound that are sent to this circuit for detecting 26.This broadcast circuit 22 is provided with another amplifier 221, makes the signal that plays sound that receiving circuit transmitted of this mobile phone 16, can give amplifying signal via this another amplifier 221 earlier, is played back by these loudspeaker 21 again.
In addition, can also be provided with a switching device 27 between the control circuit 25 of circuit 20 of the present utility model and the microphone 14, make this circuit for detecting 26 detect playing sound during signal of this broadcast circuit 22, can transmit the signal to this control circuit 25, make this control circuit 25 control this switching device 27 immediately, the circuit that makes this switching device 27 switch this microphone 14 and mobile phone 16 is an off state, makes microphone 14 can't send signal;
When this circuit for detecting 26 does not detect playing sound during signal of this broadcast circuit 22, then this control circuit 25 is controlled this switching device 27, the circuit that makes this switching device 27 switch this microphone 14 and mobile phone 16 is a channel status, makes microphone 14 can send signal.So, when loudspeaker 21 actions, the circuit of this microphone 14 and mobile phone 16 makes microphone 14 can't send signal for opening circuit; When loudspeaker 21 did not move, this microphone 14 was a channel status with the circuit of mobile phone 16, makes microphone 14 can send signal, and the signal of loudspeaker 21 can not feedback in microphone 14, avoids producing the ear-piercing people's of disturbing whistle and background echo.
Consult shown in Figure 2, this switching device 27 can be a relay, make this circuit for detecting 26 detect playing sound during signal of this broadcast circuit 22, can transmit the signal to this control circuit 25, make this control circuit 25 control this relay immediately, the circuit that makes this relay switch this microphone 14 and mobile phone 16 is an off state, makes microphone 14 can't send signal;
When these circuit for detecting 26 ends detect playing sound during signal of this broadcast circuit 22, then this control is bared 25 and is controlled this relay, makes this relay switch the link tester line state of this microphone 14 and mobile phone 16, and microphone 14 can send signal.So, during loudspeaker 21 actions, the circuit of this microphone 14 and mobile phone 16 makes microphone 14 can't send signal for opening circuit; When loudspeaker 21 did not move, this microphone 14 was a channel status with the circuit of mobile phone 16, makes microphone 14 can send signal, made the signal of loudspeaker 21 can not feedback microphone 14, the whistle and the background echo of avoiding producing the ear-piercing people of disturbing.
Consult Fig. 2-shown in Figure 3, in the most preferred embodiment more of the present utility model, the whistle of this circuit 20 and background echo cancellation circuit coupling 23 are a photoelectric coupled circuit 231, when making the receiving circuit of this mobile phone 16 transmit the signal that plays sound to these loudspeaker 21, the electric current of this signal that plays sound can pass through this photoelectric coupled circuit 231, start this photoelectric coupled circuit 231 and change its resistance, make this resistance reduce the sensitivity of this microphone 14, the signal of order attenuating loudspeaker 21 is feedback in microphone 14, avoids producing the ear-piercing people's of disturbing whistle and background echo.
The above only is the utility model most preferred embodiment, and structural feature of the present utility model is not limited thereto; anyly be familiar with this skill person; in the utility model field, can think easily and variation or modification, all can be encompassed within the protection range of the present utility model.
Claims (5)
1, a kind of handfree receiver unit of eliminating the generation of howl back and background echo, it is characterized in that: it includes a main body; Circuit for detecting is to be located in this main body, and the broadcast circuit in this circuit for detecting and this main body is connected; Control circuit is to be located in this main body, and the microphone in this control circuit and this main body is connected, and joins with this circuit for detecting.
2, the handfree receiver unit of eliminating the generation of howl back and background echo according to claim 1 is characterized in that: be provided with an amplifier between this circuit for detecting and this broadcast circuit.
3, the handfree receiver unit of eliminating the generation of howl back and background echo according to claim 1 is characterized in that: be provided with a switching device between this control circuit and microphone.
4, the handfree receiver unit of eliminating the generation of howl back and background echo according to claim 3, it is characterized in that: this switching device is a relay.
5, the handfree receiver unit of eliminating the generation of howl back and background echo according to claim 1 is characterized in that: be provided with a photoelectric coupled circuit between the broadcast circuit of this main body and the microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02254990 CN2582309Y (en) | 2002-09-27 | 2002-09-27 | Hand-free receiver able to eliminate feedback voice and background echo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02254990 CN2582309Y (en) | 2002-09-27 | 2002-09-27 | Hand-free receiver able to eliminate feedback voice and background echo |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2582309Y true CN2582309Y (en) | 2003-10-22 |
Family
ID=33723612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02254990 Expired - Fee Related CN2582309Y (en) | 2002-09-27 | 2002-09-27 | Hand-free receiver able to eliminate feedback voice and background echo |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2582309Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521015B (en) * | 2008-02-27 | 2011-08-24 | 旭丽电子(广州)有限公司 | Method for reducing sound echo, relevant echo eliminating device and speech device |
| CN103618982A (en) * | 2013-12-10 | 2014-03-05 | 联想(北京)有限公司 | Circuit and method for lowering far-end echoes, headset detecting circuit and method and headset |
| CN107682786A (en) * | 2017-10-31 | 2018-02-09 | 广东小天才科技有限公司 | A kind of microphone apparatus anti-interference method and microphone apparatus |
-
2002
- 2002-09-27 CN CN 02254990 patent/CN2582309Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521015B (en) * | 2008-02-27 | 2011-08-24 | 旭丽电子(广州)有限公司 | Method for reducing sound echo, relevant echo eliminating device and speech device |
| CN103618982A (en) * | 2013-12-10 | 2014-03-05 | 联想(北京)有限公司 | Circuit and method for lowering far-end echoes, headset detecting circuit and method and headset |
| CN103618982B (en) * | 2013-12-10 | 2019-02-05 | 联想(北京)有限公司 | Reduce the circuit and method, earphone detection circuit and method, earphone of distal end echo |
| CN107682786A (en) * | 2017-10-31 | 2018-02-09 | 广东小天才科技有限公司 | A kind of microphone apparatus anti-interference method and microphone apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |