CN101001293B - Method for removing echo in radio earphone communication - Google Patents
Method for removing echo in radio earphone communication Download PDFInfo
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- CN101001293B CN101001293B CN2006100009868A CN200610000986A CN101001293B CN 101001293 B CN101001293 B CN 101001293B CN 2006100009868 A CN2006100009868 A CN 2006100009868A CN 200610000986 A CN200610000986 A CN 200610000986A CN 101001293 B CN101001293 B CN 101001293B
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- earphone communication
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Abstract
This invention discloses a method for eliminating echo in radio earphone communication including: 1, carrying out time delay operation and amplitude modulation operation to at least two branch signalsof the received signals of the earphone so as to generate at least two forecast echo signals, the phase and amplitude of which are the same with those of two corresponding actual echo signals, 2, carrying out at least two times of wave-mixing operation to cancel the two actual echo signals mixed in the transmitted signals by the generated two forecast echo signals.
Description
Technical field
The present invention relates to a kind of echo removing method, relate in particular to the removing method of echo in a kind of radio earphone communication.
Background technology
Wireless headset does not need the signal line between mobile phone and conventional earphone and the microphone, thereby uses and carry conveniently, more and more is subjected to consumer's favor.Yet common wireless headset (as blue-tooth earphone) mostly has smaller volume, and the distance between its receiver and the microphone is very short.So when actual communication, the sound wave that headset earpiece is sent is easy to import in the earphone microphone, and and then pass back long-rangely, make the long-range echo of experiencing.
Theoretically, the sound wave that is sent by headset earpiece is to import in the microphone via many different echo path, so will correspondingly produce multiple echo.Yet, comparatively tangible in the reality, can by the echo of user's perception only know well several.With the blue-tooth earphone is example, and the echo that it produced mainly comprises two kinds, is referred to as short echo and long echo usually.Wherein, short echo is that the receiver of sound wave by the earphone outside to the direct echo path of microphone of receiver passes to microphone and produces, and the sound wave that long echo is a receiver passes through a series of reflection by an indirect echo path and passes in the microphone and produce in the blue-tooth earphone shell.
The echo meeting that produces between the receiver of above-mentioned wireless headset and the microphone has influence on the normal communication of both call sides.In view of this, industry is constantly explored relevant echo removing method, to improve the communication quality of wireless headset.
Usually, can realize the function of echo cancellation by the mode of wireless headset being carried out the particular organization design, this mode is that the physical phenomenon with the sonic propagation behavior is a research direction, find out the configuration of optimal receiver and microphone relative bearing, best inner geometry mechanism design and select the relevant shell clad material that blocks sound wave transmission or reflection for use, the sound wave that receiver is spread out of as far as possible only passes to people's ear, microphone then as far as possible only receives the sound of speaking of near-end user, does not disturb mutually.Yet, realize echo cancellation by the design in the mechanism, the material and the measure of precision of device there is higher requirement, so the difficulty in design and production process is bigger.
In addition, also can realize eliminating the purpose of echo by in wireless headset, setting up particular electrical circuit.Adopt this mode, can first molding " receiver-coating space-microphone " system, promptly determine the features such as structure, material and moulding of wireless headset earlier, after wireless headset completes, and then the corresponding echo cancellation circuit coupling of design is eliminated echo.Usually, the method that blue-tooth earphone uses is to realize that by DSP (DigitalSignal Process, Digital Signal Processing) technology promptly the integrated DSP function realizes echo cancellation function in the blue-tooth earphone chip.Be integrated with the existing more use of blue-tooth earphone chip of DSP function now, this class chip has good echo cancellation effect, but its technical sophistication, need to realize echo cancellation function by cooperation soft, hardware, thereby make that this class blue-tooth earphone chip cost is quite high, be only applicable to usually in the high-end blue-tooth earphone product.
So, be necessary to propose a kind of echo cancellation technology of new wireless headset, when realizing preferable echo cancellation effect, have easy enforcement, characteristics that implementation cost is low again.
Summary of the invention
The removing method that the purpose of this invention is to provide echo in a kind of radio earphone communication, the echo that produces between receiver and the microphone when being used to eliminate the use radio earphone communication, thereby the communication quality of lifting wireless headset.
For achieving the above object, the invention provides the removing method of echo in a kind of radio earphone communication, it is characterized in that: this method may further comprise the steps: (1) all carries out delay operation and amplitude modulation operation at least two branch signals of the received signal of wireless headset, thereby produce at least two prediction echo signals, these at least two prediction phase places of echo signals and amplitude are identical with the phase place and the amplitude of corresponding at least two actual echo signals; (2) corresponding at least twice smear of carrying out is operated, and at least two actual echo signals that utilize above-mentioned at least two prediction echo signals that produce will mix in sending signal are respectively offset.
As mentioned above, the present invention can carry out echo cancellation targetedly at comparatively tangible echo in the radio earphone communication, can realize preferable echo cancellation effect.Simultaneously, the principle of the invention is simple, adopts the operation of time-delay, amplitude modulation and smear to realize, and implement easily, implementation cost is low.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and Examples.
The circuit block diagram of Fig. 1 for carrying out a preferred embodiment of echo cancellation according to the removing method of echo in the radio earphone communication of the present invention.
Embodiment
By describing technology contents of the present invention, structural feature in detail, realized purpose and effect, below exemplify embodiment now and conjunction with figs. describes in detail.
For making the present invention be more readily understood, present embodiment is example with the blue-tooth earphone, embodies the removing method of echo in the radio earphone communication of the present invention by the removing method of introducing short-and-medium echo of blue-tooth earphone communication and long echo.
Present embodiment is to eliminate at the most tangible short echo in the blue-tooth earphone communication and long echo, so utilize the two-way electronic circuit respectively the short echo transmission characteristic and the long echo transmission characteristic of reality to be carried out emulation.Wherein the two-way electronic circuit all is used for the branch signal of the received signal of blue-tooth earphone receiver is delayed time and the amplitude modulation operation, thereby correspondingly produces phase place and the amplitude prediction short echo signal identical with the actual (tube) length echo signal with actual short echo signal and predict long echo signal.Then, carry out smear operation, promptly will be entrained in actual short echo signal and the counteracting of actual (tube) length echo signal in the transmission signal of near-end user with short echo signal of this prediction and the long echo signal of prediction.
As shown in Figure 1, be to utilize the removing method of echo in the radio earphone communication of the present invention to carry out an above-mentioned short echo and a circuit block diagram of growing echo cancellation.This echo cancellation circuit coupling comprises delayer 11, amplifier 12, multiplier 13, delayer 21, amplifier 22 and multiplier 23.
Wherein, the input of delayer 11 and delayer 21 connects the input of receiver 30 respectively.The input of amplifier 12 connects the output of delayer 11, and the input of amplifier 22 connects the output of delayer 21.Two inputs of multiplier 13 connect the output of amplifier 12 and the output of microphone 40 respectively, and two inputs of multiplier 23 connect the output of amplifier 22 and the output of multiplier 13 respectively.
Below again in conjunction with Fig. 1, the process of the removing method of echo in the radio earphone communication of the present invention being carried out echo cancellation is described.
The receiver of supposing the near-end blue-tooth earphone is R from the received signal that long-range reception comes.On the one hand, this received signal R will be transferred to receiver 30, and further be emitted by receiver 30, form to receive speech Vr.The major part that receives speech Vr will be imported in the near-end user ear, thereby be responded to by near-end user; And remainder will be propagated by take back a sound path and an indirect echo path always, thereby forms corresponding short echo E1 and long echo E2 respectively.Short echo E1 and long echo E2 will together import in the microphone 40 of blue-tooth earphone with the transmission speech Vs of near-end user, have just produced transmission signal S.Just mixing in this transmission signal S has and short echo E1 and corresponding actual short echo signal and the actual (tube) length echo signal of long echo E2.
On the other hand, the branch signal of this received signal R is transfused to delayer 11, carries out the delay operation of a special time, and the delay time of this delay operation is corresponding through the time that direct echo path is sent to microphone 40 with reception speech Vr.Through after the delay operation, delayer 11 outputs one phase place and the identical time delayed signal D1 of actual short echo signal.This time delayed signal D1 and then be transferred into amplifier 12 carries out a specific amplitude modulation operation, and through this amplitude modulation operation, amplifier 12 is just exported a phase place and all identical with the actual weak point echo signal prediction weak point echo signal A1 of amplitude.The short echo signal A1 of this prediction will be transfused in the multiplier 13.Similarly, another branch signal of this received signal R is transferred into delayer 21, carries out the delay operation of another special time, and the delay time of this another delay operation is corresponding through the time that indirect echo path is sent to microphone 40 with reception speech Vr.Through after this another delay operation, the delayer 21 output one phase places time delayed signal D2 identical with above-mentioned actual (tube) length echo signal.This time delayed signal D2 and then be transferred into amplifier 22 carries out another specific amplitude modulation operation, and through this another specific amplitude modulation operation, amplifier 22 is just exported a phase place and all identical with the actual (tube) length echo signal long echo signal A2 of prediction of amplitude.The long echo signal A2 of this prediction will be transfused in the multiplier 23.
Then, short echo signal A1 of prediction and transmission signal S are imported in the multiplier 13 jointly, carry out a smear operation, the short echo signal that utilizes the short echo signal A1 of the above-mentioned prediction that produces will mix the reality in sending signal S balances out, so that multiplier 13 outputs is a short echo cancellation signal M1.Then, this weak point echo cancellation signal M1 and the long echo prediction signal A2 that is exported by amplifier 22 are imported in the multiplier 23 jointly, carry out the operation of another time smear, the actual (tube) length echo signal that utilizes the long echo signal A2 of the above-mentioned prediction that produces will mix in sending signal S balances out.Thereby multiplier 23 outputs one long echo cancellation signal M2.So far, should be one by the long echo cancellation signal M2 of multiplier 23 output and both handle through too short echo cancellation, the signal of handling through long echo cancellation again, this signal are further transferred to when long-range, and the long-distance user will no longer experience short echo and length echo.
It should be noted that, the purpose of above embodiment is only understood the present invention for helping, and wherein, the removing method of echo should be not limited only to the elimination of short echo and long echo in the radio earphone communication of the present invention, that is, can realize the elimination of more characteristic echoes by setting up similar time-delay, modulation circuit; In addition, the signal that is come by the received signal collection is being delayed time and the operating sequence of amplitude modulation is delayed time after also can be first amplitude modulation, the effect that realizes among its effect that realizes and the former embodiment is identical.And, produce the order respectively predict the order of echo signal and to eliminate each actual echo signal and be can arrange arbitrarily (as, in the foregoing description, also can carry out the elimination of actual (tube) length echo signal earlier, after carry out the elimination of actual weak point echo), the effect that realizes in its whole echo cancellation effect that realizes and the foregoing description is identical.Above-mentioned noticeable situation is when side circuit designs, and a transposition that needs to increase circuit or carry out the corresponding element device can realize (as with amplifier and delayer transposition), and its more former embodiment has easy enforcement equally, the characteristics that implementation cost is low.Moreover, carry out the multiplier of smear operation among the former embodiment and also can replace, and realize same function by subtracter.
Therefore, can sum up the operating procedure of the removing method of echo in the radio earphone communication of the present invention, it comprises:
(1) at least two branch signals to the received signal of wireless headset all carry out specific delay operation and amplitude modulation operation, thereby produce at least two prediction echo signals, these at least two prediction phase places of echo signals and amplitude are identical with the phase place and the amplitude of corresponding at least two actual echo signals;
(2) corresponding at least twice smear of carrying out is operated, and at least two actual echo signals that utilize above-mentioned at least two prediction echo signals that produce will mix in sending signal are respectively offset.
As mentioned above, echo removing method of the present invention can cooperate simple circuit, by delay time to received signal, amplitude modulation operation, thereby produce and the very approaching prediction echo signal of actual echo signal, and then carry out elimination to actual echo.This method also has easy enforcement when realizing preferable echo cancellation effect, and the low characteristics of implementation cost.
The above; only be one of preferable feasible embodiment of the present invention; can not therefore promptly limit to interest field of the present invention; concerning being familiar with those of ordinary skill in the art; such as use technical scheme of the present invention and technical conceive to make other various corresponding changes and distortion, and all these changes and distortion all should belong within the protection range of claim of the present invention.
Claims (10)
1. the removing method of echo in the radio earphone communication is used to eliminate the echo that produces between the receiver and microphone when using radio earphone communication, and it is characterized in that: this method may further comprise the steps:
(1) at least two branch signals to the received signal of wireless headset all carry out delay operation and amplitude modulation operation, thereby produce at least two prediction echo signals, these at least two prediction phase places of echo signals and amplitude are identical with the phase place and the amplitude of corresponding at least two actual echo signals;
(2) corresponding at least twice smear of carrying out is operated, and at least two actual echo signals that utilize above-mentioned at least two prediction echo signals that produce will mix in sending signal are respectively offset.
2. the removing method of echo in the radio earphone communication as claimed in claim 1 is characterized in that: described wireless headset is a blue-tooth earphone.
3. the removing method of echo in the radio earphone communication as claimed in claim 2 is characterized in that: described at least two actual echo signals comprise actual weak point echo signal and actual (tube) length echo signal.
4. the removing method of echo in the radio earphone communication as claimed in claim 3 is characterized in that: described at least two prediction echo signals comprise short echo signal of prediction and the long echo signal of prediction.
5. the removing method of echo in the radio earphone communication as claimed in claim 1 is characterized in that: when producing the prediction echo signal, be to the advanced line delay operation of the branch signal of described received signal, after carry out the amplitude modulation operation.
6. the removing method of echo in the radio earphone communication as claimed in claim 1 is characterized in that: when producing the prediction echo signal, be that the branch signal to described received signal carries out the amplitude modulation operation earlier, laggard line delay operation.
7. the removing method of echo in the radio earphone communication as claimed in claim 1 is characterized in that: adopt delayer to carry out described delay operation.
8. the removing method of echo in the radio earphone communication as claimed in claim 1 is characterized in that: adopt amplifier to carry out described amplitude modulation operation.
9. the removing method of echo in the radio earphone communication as claimed in claim 1 is characterized in that: adopt multiplier to carry out described smear operation.
10. the removing method of echo in the radio earphone communication as claimed in claim 1 is characterized in that: adopt subtracter to carry out described smear operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100009868A CN101001293B (en) | 2006-01-13 | 2006-01-13 | Method for removing echo in radio earphone communication |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100009868A CN101001293B (en) | 2006-01-13 | 2006-01-13 | Method for removing echo in radio earphone communication |
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| CN101001293A CN101001293A (en) | 2007-07-18 |
| CN101001293B true CN101001293B (en) | 2010-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006100009868A Expired - Fee Related CN101001293B (en) | 2006-01-13 | 2006-01-13 | Method for removing echo in radio earphone communication |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106331958A (en) * | 2016-08-26 | 2017-01-11 | 深圳市新国都支付技术有限公司 | Echo cancellation method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152828A (en) * | 1995-09-29 | 1997-06-25 | 帕拉德尼有限公司 | Echo canceler gain tracker for cellular modems |
| CN1191650A (en) * | 1995-05-30 | 1998-08-26 | 艾利森公司 | Apparatus and method for increasing intelligibility of loudspeaker output and for echo cancellation in telephone |
| CN1251192A (en) * | 1997-11-22 | 2000-04-19 | 皇家菲利浦电子有限公司 | Audio processing arrangement with multiple sources |
| CN1353904A (en) * | 1999-04-07 | 2002-06-12 | 艾利森公司 | Method and apparatus for space-time echo cancellation |
-
2006
- 2006-01-13 CN CN2006100009868A patent/CN101001293B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191650A (en) * | 1995-05-30 | 1998-08-26 | 艾利森公司 | Apparatus and method for increasing intelligibility of loudspeaker output and for echo cancellation in telephone |
| CN1152828A (en) * | 1995-09-29 | 1997-06-25 | 帕拉德尼有限公司 | Echo canceler gain tracker for cellular modems |
| CN1251192A (en) * | 1997-11-22 | 2000-04-19 | 皇家菲利浦电子有限公司 | Audio processing arrangement with multiple sources |
| CN1353904A (en) * | 1999-04-07 | 2002-06-12 | 艾利森公司 | Method and apparatus for space-time echo cancellation |
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Granted publication date: 20100421 Termination date: 20120113 |