CN202998253U - Howling elimination system and hand-free phone - Google Patents
Howling elimination system and hand-free phone Download PDFInfo
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- CN202998253U CN202998253U CN 201220688961 CN201220688961U CN202998253U CN 202998253 U CN202998253 U CN 202998253U CN 201220688961 CN201220688961 CN 201220688961 CN 201220688961 U CN201220688961 U CN 201220688961U CN 202998253 U CN202998253 U CN 202998253U
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Abstract
The utility model relates to the field of speech hand-free conversation, particularly relates to a howling elimination system and a hand-free phone, and the hand-free phone can be switched between half-duplex and full-duplex. The howling elimination system comprises a gain detection device which is used for detecting a side tone gain and an echo gain in a conversation environment with an interval of set time, wherein the gain detection device comprises a detection device and a timing device which are in mutual connection; a calculator which is used for calculating the sum of loop gains and is connected with the gain detection device, wherein the loop gains comprises a microphone gain, a transmission gain, a reception gain, a speaker gain, the side tone gain and the echo gain; a judging device which is connected with the computer and is used for judging whether the sum of the loop gains is larger than a set value and sending a judgment result; a conversion device which is connected with the judging device and is used for receiving the judgment result, when the sum is larger than the set value, a conversation mode is set as a half-duplex mode, and when the sum is smaller than or equal to the set value, the conversation mode is set as a full-duplex mode.
Description
Technical field
The utility model relates to voice hand-free call field, is specifically related to a kind of elimination system and hands-free phone of uttering long and high-pitched sounds.
Background technology
Hand-free function is used more and more, for example, is holding a meeting, is using hand-free function in to the situation such as vehicle-mounted of making peace.The phenomenon of uttering long and high-pitched sounds easily appears when using hand-free function, the reason of its generation is: the signal of near-end receiver is feedback to the transmitter of near-end by acoustic path, then returns from the acoustic path of network sidetone or opposite end, thereby forms feedback, if this feedback becomes positive feedback, will form and utter long and high-pitched sounds.The impact of microphone of uttering long and high-pitched sounds is larger, and for example the Time-delayed Feedback of loud speaker sound field, can make whole system form a series of time-delay echo, and this echo will increase the weight of comb-filter effect, produces the reverberation hangover of obviously distortion.
For fear of the phenomenon of uttering long and high-pitched sounds occurs when using hand-free function, prior art has adopted following two kinds of methods.Method one: adopt half-duplex mode.So-called half-duplex, the information that refers to can send on both direction between 2 o'clock, but the working method that can not send simultaneously.Be synchronization, side's speech can only be arranged, a side who keeps silence closes transmission path, and the path of the positive feedback that so just cutting off causes uttering long and high-pitched sounds occurs is avoided forming and uttered long and high-pitched sounds.Employing method one need to manually be switched transmit leg and recipient, and the efficient of dialogue is lower.Method two: adopt full duplex mode.So-called full duplex refers to that communication allows data transmission simultaneously on both direction, and it is equivalent to the combination of two simplex modes on ability.Wherein, single work refers to only allow the Party A to transmit information to the Party B, and the Party B can not transmit to the Party A.Method two is avoided forming and is uttered long and high-pitched sounds by the good inhibition near end echo and sidetone.
But in using method for the moment, side's speech can only be arranged, the opposing party's speech can not transmit, and information transfer efficiency is low, easily causes linking up difficulty; When using method two, although both sides can talk simultaneously, and the information of speech also can transmit simultaneously, when relatively poor, will cause the phenomenon of uttering long and high-pitched sounds when echo inhibition and anti-sidetone effect, and effect is unstable.To sum up, method one and method two can not be changed as the case may be, thereby avoid the generation of uttering long and high-pitched sounds.
The utility model content
The utility model provides a kind of elimination system and hands-free phone of uttering long and high-pitched sounds, and can make when hands-free phone is conversed and change between half-duplex and full duplex.
The utility model provides a kind of elimination system of uttering long and high-pitched sounds, and comprising:
The gain checkout gear, it is used for detecting every setting-up time sidetone gain and the echo gain of conversation environment, and described gain checkout gear comprises detector and timer, and described timer is connected with described detector;
Calculator, it is used for the summation of counter circuit gain, and it is connected with described gain checkout gear, and wherein, described loop gain comprises microphone gain, transmission gain, receiving gain, speaker gain, the gain of described sidetone and described echo gain;
Judgment means, it is connected with described calculator, and whether its summation that is used for judging described loop gain is greater than set point, and the transmission judged result;
Conversion equipment, it is connected with described judgment means, and it is used for receiving described judged result, and during greater than set point, call mode is set to semiduplex mode when described summation; When described summation was less than or equal to set point, call mode was set to full-duplex mode;
Wherein, described transmission gain sends to the gain of outside line for the signal of telecommunication with the microphone conversion amplifies; Described receiving gain is transported to the gain of loud speaker for the signal with outside line amplifies.
In each embodiment of the utility model, preferably, described gain checkout gear further comprises: the echo cancelltion gain detector, and it gains for detection of echo cancelltion; Wherein, the echo gain of described echo cancelltion gain for eliminating by echo canceller.
In each embodiment of the utility model, preferably, described gain checkout gear further comprises: sidetone is removed gain detector, and it removes gain for detection of sidetone; Wherein, described sidetone is removed the sidetone gain of gain for eliminating by the sidetone Canceller.
The utility model also provides a kind of hands-free phone, comprising:
Acoustic input dephonoprojectoscope;
Voice output;
Full duplex, half-duplex conversion equipment, its input is connected with described acoustic input dephonoprojectoscope, and output is connected with described voice output;
The elimination system of uttering long and high-pitched sounds as described, it is connected respectively the half-duplex conversion equipment and is connected with described acoustic input dephonoprojectoscope, voice output and full duplex.
In each embodiment of the utility model, preferably, further comprise: echo canceller, it is connected with voice output with described acoustic input dephonoprojectoscope.
In each embodiment of the utility model, preferably, further comprise: the sidetone Canceller, it is connected with voice output with described acoustic input dephonoprojectoscope.
Utter long and high-pitched sounds elimination system and hands-free phone by each embodiment of the utility model provides, can bring following beneficial effect:
In hands-free phone, its microphone gain, send gain, receiving gain, speaker gain and determined by the performance of equipment itself, therefore, the above-mentioned gain of each hands-free phone is fixed value, therefore only need disposable recording and record; But sidetone gain and echo gain can change in communication process, therefore, in communication process, the sidetone that detects in the conversation environment every setting-up time gains and echo gain, calculate the summation of microphone gain, transmission gain, receiving gain, speaker gain, the gain of described sidetone and described echo gain, obtained the summation of the loop gain of hands-free phone; Condition when setting in advance full duplex and half-duplex conversion, be used for the summation that calculates is judged, during greater than set point, for the stability that guarantees to converse, conversation is set to semiduplex mode when summation, when summation during less than set point, can strengthen communication effect, call mode is set to full-duplex mode, like this, can periodically change between full duplex and half-duplex according to the conversation environment, well avoid producing the possibility of uttering long and high-pitched sounds.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in below describing is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawing illustrated embodiments other embodiment and accompanying drawing thereof.
Fig. 1 is the utter long and high-pitched sounds flow chart of embodiment of removing method of the utility model;
Fig. 2 is the utter long and high-pitched sounds flow chart of embodiment of removing method of the utility model;
Fig. 3 is the utter long and high-pitched sounds structural representation of embodiment of elimination system of the utility model;
Fig. 4 is the utter long and high-pitched sounds gain schematic diagram of embodiment of elimination system of the utility model;
Fig. 5 is the structural representation of the embodiment of the utility model hands-free phone;
Fig. 6 is the structural representation of the embodiment of the utility model hands-free phone.
Embodiment
Below with reference to accompanying drawing, the technical scheme of each embodiment of the utility model is carried out clear, complete description, obviously, described embodiment is only a part of embodiment of the present utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are resulting all other embodiment under the prerequisite of not making creative work, all belong to the scope that the utility model is protected.
In one embodiment, as shown in Figure 1, be the flow chart of the removing method of uttering long and high-pitched sounds, described method comprises the steps:
Should be understood that to send gain for the signal of telecommunication with the microphone conversion amplifies, send to the gain of outside line; Receiving gain is transported to the gain of loud speaker for the signal with outside line amplifies.
Should be understood that microphone gain is, is converted to voice signal the sensitivity of microphone of the signal of telecommunication.
Sending gain is that the signal of telecommunication that microphone is changed amplifies the gain that sends to outside line.
Receiving gain is, will amplify from the signal of outside line, is transported to the gain of loud speaker.
Speaker gain is the signal of telecommunication to be converted to the ability of acoustic signal.
In hands-free phone, in order to reach the requirement of certain sending and receiving loudness, microphone gain and send gain and, with, receiving gain and speaker gain and, be given value.
The sidetone gain is relevant to the impedance matching of hands-free phone and outside line, so different outside line, its sidetone gain is not identical yet, and this value can be by when only having near-end transmission voice there is no the far-end calling, and the ratio of measurement circuitry inverse signal and transmitted signal obtains.
Under identical network and acoustic enviroment, use the removing method of uttering long and high-pitched sounds, can improve the volume of reception of loud speaker in hands-free phone, made the user more clearly hear the sound of far-end, also improve simultaneously the transmission volume of microphone, made the sound that far-end can the clearer user of hearing.
In one embodiment, as shown in Figure 2, be the flow chart of the removing method of uttering long and high-pitched sounds, described method comprises the steps:
In one embodiment, as shown in Figure 3, be the structural representation of the elimination system that utters long and high-pitched sounds, this elimination system of uttering long and high-pitched sounds can be for adopting the elimination system of uttering long and high-pitched sounds of the above-mentioned removing method of uttering long and high-pitched sounds.
The elimination system of uttering long and high-pitched sounds comprises: gain checkout gear 301, calculator 302, judgment means 303 and conversion equipment 304.
Gain checkout gear 301 is used for detecting every setting-up time sidetone gain and the echo gain of conversation environment.Should be immediately, the gain detector here comprises detector and timer, timer is connected with detector.Setting-up time herein is 32 microsecond to 1000000 microseconds.
Calculator 302 is connected with gain checkout gear 301, is used for the summation of counter circuit gain, and wherein, loop gain comprises microphone gain, transmission gain, receiving gain, speaker gain, sidetone gain and echo gain.Should understand, the microphone gain of each hands-free phone and send gain and, with, receiving gain and speaker gain and, be fixed value, determine according to the performance of hands-free phone itself, need not real-time measurement, so, only need with microphone gain and send gain and, with, receiving gain and speaker gain and, directly be pre-stored in calculator 302 and get final product.
Judgment means 303, it is connected with calculator 302, and whether the summation that is used for judging loop gain is greater than set point, and the transmission judged result.Set point herein can be 0 decibel-8 decibels.
Wherein, send gain for the signal of telecommunication with the microphone conversion amplifies, send to the gain of outside line; Receiving gain is transported to the gain of loud speaker for the signal with outside line amplifies.
In one embodiment, can also be with interior echo cancelltion gain detector and the sidetone removing gain detector of further arranging of gain checkout gear 301, the echo cancelltion gain detector gains for detection of echo cancelltion; Sidetone is removed gain detector and is removed gain for detection of sidetone.
Wherein, the echo gain of echo cancelltion gain for eliminating by echo canceller; Sidetone is removed the sidetone gain of gain for eliminating by the sidetone Canceller.
In one embodiment, as shown in Figure 4, gain schematic diagram for the elimination system that utters long and high-pitched sounds comprises: outside line 401, sidetone gain 402, sidetone are removed gain 403, receiving gain 404, speaker gain 405, loud speaker 406, echo gain 407, microphone 408, microphone gain 409, echo cancelltion gain 410 and are sent gain 411.
Loop gain comprises sidetone gain 402, sidetone removing gain 403, receiving gain 404, speaker gain 405, loud speaker 406, echo gain 407, microphone 408, microphone gain 409, echo cancelltion gain 410 and sends gain 411.
In one embodiment, as shown in Figure 5, the structural representation for the embodiment of hands-free phone comprises: acoustic input dephonoprojectoscope 501, full duplex, half-duplex conversion equipment 502, voice output 503 and the elimination system 504 that utters long and high-pitched sounds.
Full duplex, half-duplex conversion equipment 502, its input is connected with acoustic input dephonoprojectoscope 501, and output is connected with voice output 503.The elimination system of uttering long and high-pitched sounds 504 adopts the elimination system of uttering long and high-pitched sounds as previously described, and it is connected half-duplex conversion equipment 502 with acoustic input dephonoprojectoscope 501, voice output 503 respectively and is connected with full duplex.
Can further include echo canceller and sidetone Canceller, echo canceller is connected with acoustic input dephonoprojectoscope 501, and the sidetone Canceller is connected with acoustic input dephonoprojectoscope 501.
In one embodiment, as shown in Figure 6, structural representation for another embodiment of hands-free phone comprises: 3 microphones 601, operational amplifier 602, adder 603,3 analog to digital converters 604, micro-control unit 605, digital signal processor 606, signal strength detection circuit 607, automatic gain adjusting circuit 608, signal control circuit 609, phone 2/4 line change-over circuit 610, digital to analog converter 613, power amplifier 611 and loud speakers 612.
Voice signal by microphone 601 inputs, through operational amplifier 602, signal is amplified, then the signal after 3 being amplified through operational amplifier 602 is integrated by adder 603, signal after integrating is sent to analog to digital converter 604, signal is carried out analog-to-digital conversion, digital signal after conversion is sent to digital signal processor 606, digital signal processor 606 is used for the size of judgement communication process loop gain, and conversation is in the switching of full-duplex mode and semiduplex mode.In like manner, sound is sent to the process of loud speaker 612 also for like this by telephone wire.
The various embodiment that the utility model provides can be as required combination mutually in any way, the technical scheme that obtains by this combination is also in scope of the present utility model.
Obviously, those skilled in the art can carry out various changes and modification and not break away from spirit and scope of the present utility model the utility model.Like this, if of the present utility model these are revised and within modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model also comprises these changes and modification interior.
Claims (6)
1. the elimination system of uttering long and high-pitched sounds, is characterized in that, comprising:
The gain checkout gear, it is used for detecting every setting-up time sidetone gain and the echo gain of conversation environment, and described gain checkout gear comprises detector and timer, and described timer is connected with described detector;
Calculator, it is used for the summation of counter circuit gain, and it is connected with described gain checkout gear, and wherein, described loop gain comprises microphone gain, transmission gain, receiving gain, speaker gain, the gain of described sidetone and described echo gain;
Judgment means, it is connected with described calculator, and whether its summation that is used for judging described loop gain is greater than set point, and the transmission judged result;
Conversion equipment, it is connected with described judgment means, and it is used for receiving described judged result, and during greater than set point, call mode is set to semiduplex mode when described summation; When described summation was less than or equal to set point, call mode was set to full-duplex mode;
Wherein, described transmission gain sends to the gain of outside line for the signal of telecommunication with the microphone conversion amplifies; Described receiving gain is transported to the gain of loud speaker for the signal with outside line amplifies.
2. the elimination system of uttering long and high-pitched sounds as claimed in claim 1, is characterized in that, described gain checkout gear further comprises: the echo cancelltion gain detector, and it gains for detection of echo cancelltion; Wherein, the echo gain of described echo cancelltion gain for eliminating by echo canceller.
3. the elimination system of uttering long and high-pitched sounds as claimed in claim 1, is characterized in that, described gain checkout gear further comprises: sidetone is removed gain detector, and it removes gain for detection of sidetone; Wherein, described sidetone is removed the sidetone gain of gain for eliminating by the sidetone Canceller.
4. a hands-free phone, is characterized in that, comprising:
Acoustic input dephonoprojectoscope;
Voice output;
Full duplex, half-duplex conversion equipment, its input is connected with described acoustic input dephonoprojectoscope, and output is connected with described voice output;
The elimination system of uttering long and high-pitched sounds as described in any one in claim 1-3, it is connected respectively the half-duplex conversion equipment and is connected with described acoustic input dephonoprojectoscope, voice output and full duplex.
5. hands-free phone as claimed in claim 4, is characterized in that, further comprises: echo canceller, it is connected with voice output with described acoustic input dephonoprojectoscope.
6. hands-free phone as claimed in claim 4, is characterized in that, further comprises: the sidetone Canceller, it is connected with voice output with described acoustic input dephonoprojectoscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688961 CN202998253U (en) | 2012-12-13 | 2012-12-13 | Howling elimination system and hand-free phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688961 CN202998253U (en) | 2012-12-13 | 2012-12-13 | Howling elimination system and hand-free phone |
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| Publication Number | Publication Date |
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| CN202998253U true CN202998253U (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220688961 Expired - Fee Related CN202998253U (en) | 2012-12-13 | 2012-12-13 | Howling elimination system and hand-free phone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037121A (en) * | 2012-12-13 | 2013-04-10 | 深圳市音络科技有限公司 | Squeaking elimination method and squeaking elimination system and hand-free phone |
| CN111937371A (en) * | 2019-03-13 | 2020-11-13 | Nec平台株式会社 | Telephone apparatus, method of controlling telephone apparatus, and program |
-
2012
- 2012-12-13 CN CN 201220688961 patent/CN202998253U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103037121A (en) * | 2012-12-13 | 2013-04-10 | 深圳市音络科技有限公司 | Squeaking elimination method and squeaking elimination system and hand-free phone |
| CN103037121B (en) * | 2012-12-13 | 2015-01-07 | 深圳市音络科技有限公司 | Squeaking elimination method and squeaking elimination system and hand-free phone |
| CN111937371A (en) * | 2019-03-13 | 2020-11-13 | Nec平台株式会社 | Telephone apparatus, method of controlling telephone apparatus, and program |
| CN111937371B (en) * | 2019-03-13 | 2021-11-02 | Nec平台株式会社 | Telephone apparatus, method of controlling telephone apparatus, and program |
| US11496627B2 (en) | 2019-03-13 | 2022-11-08 | Nec Platforms, Ltd. | Telephone apparatus, method of controlling telephone apparatus, and program |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20141213 |
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| EXPY | Termination of patent right or utility model |