CN202475574U - Echo-cancelling talkback equipment - Google Patents
Echo-cancelling talkback equipment Download PDFInfo
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- CN202475574U CN202475574U CN2012200888620U CN201220088862U CN202475574U CN 202475574 U CN202475574 U CN 202475574U CN 2012200888620 U CN2012200888620 U CN 2012200888620U CN 201220088862 U CN201220088862 U CN 201220088862U CN 202475574 U CN202475574 U CN 202475574U
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Abstract
The utility model discloses echo-cancelling talkback equipment, which comprises an audio input module, a loudspeaker drive module, an echo cancellation module, a noise reduction and silencing module, a voice delay module and an audio output module. The echo-cancelling talkback equipment has the advantages that the maximum range of a two-way voice call is ensured to be 3 meters through the echo cancellation module, and the phenomena of echo and squeal are eliminated; input audio is controlled by using the automatic gain control algorithm of the echo cancellation module, voice is ensured to have no obvious fluctuation in the range of 1 to 3 meters, and volume has no big difference, and distortion does not exist; noise is reduced by 10 dBs, ambient noise is eliminated, and echo noise is further reduced through the noise reduction and silencing module and a time domain and frequency domain noise analysis module; and the voice is delayed by the voice delay module, and the overlap of the voice input by a loudspeaker and the voice acquired by a microphone and a phenomenon that an echo signal cannot be accurately confirmed are prevented.
Description
Technical field
The utility model relates to a kind of echo and eliminates talk back equipment, and the echo that relates in particular to a kind of security protection voice communication field is eliminated talk back equipment.
Background technology
It is existing that nowadays most speech talkback equipment can't be as the DVR of speech talkback terminal equipment and rear end (DVR) independently, the IP network video camera, and optical transceiver, cooperations such as voice plate card cause cost and expense in practical applications all than higher.And the effect of most of intercom systems can only satisfy general 1 meter distance, and the distance of intercommunication just has than limitations like this.And phenomenons such as echo often appears in speech talkback equipment in the intercommunication process, utter long and high-pitched sounds cause intercommunication normally not carry out, and echo components is to flow in the road strength of sending signal via hybrid circuit and produce owing to receiving signal.Therefore the problem that needs to solve has several as follows:
1. the double-directional speech delivery value need become far, according to existing demand, can satisfy the double-directional speech intercommunication of 1-3 rice distance;
As separate double to the speech talkback terminal, need and rear end equipment can both be mated;
3. owing to be the various hardware devices that cooperate the rear end, not only comprise acoustic echo, more likely have line echo, need to solve the elimination function of line echo.
Summary of the invention
For deficiency and the shortcoming that solves above-mentioned prior art, the utility model provides a kind of echo to eliminate that effect is eliminated, the echo processing time is short and the adjustable echo elimination of transmission range double-directional speech talk back equipment.
A kind of echo is eliminated talk back equipment; Comprise audio frequency input module, loudspeaker driver module, echo cancellation module, noise reduction noise elimination module, voice time delay module and audio frequency output module; The output of audio frequency input module is connected with the input of loudspeaker driver module and echo cancellation module respectively; The output of echo cancellation module is connected with the input of noise reduction noise elimination module; The output of noise reduction noise elimination module is connected with the input of voice time delay module, and the output of voice time delay module is connected with the input of audio frequency output module.
Preferably, described audio frequency output module comprises voice signal output module, audio output interface module, isolates output module and follows output module.
Preferably, described audio frequency input module comprises voice signal input module, audio input interface module, electrostatic defending module and level signal automatic regulating module.
Preferably, described noise reduction noise elimination module comprises front end voice signal input module, time-domain and frequency-domain noise analysis module, noise suppression module, audio power detection module and voice signal output control module.
Preferably, described echo cancellation module comprises sef-adapting filter echo cancellation module and Nonlinear Processing module.
Preferably, described voice time delay module comprises digital signal processor module, first memory module and second memory module.
A kind of echo of the utility model is eliminated talk back equipment and is had following beneficial effect:
1. echo cancellation module is eliminated to echo through the sef-adapting filter echo cancellation module, and for the spiking that can't eliminate fully; Adopt back one-level Nonlinear Processing, both cooperate, owing to there is the echo of back one-level to eliminate; Can the echo of previous stage be eliminated shortening operate time, suitable omits out with echo, and back one-level is carried out spiking with the shorter time and eliminated; Can be shortened the operate time of echo, both processing times guarantee that less than other echo elimination software institute operate time 3 meters are carried out the double-directional speech conversation farthest; Phenomenon such as eliminate echo, utter long and high-pitched sounds has effectively reduced echo signal to eliminate the time;
2. accomplish the control of input audio frequency through the automatic gaining controling algorithm of echo cancellation module, guarantee situation such as sound does not have tangible fluctuating in the 1-3 rice process, and volume is more or less the same, and is undistorted;
3. through noise reduction noise elimination module, through time domain and frequency domain noise analysis module, noise has been reduced 10dB, removed ambient noise, also further reduced the echo noise, the audio power detection module when making no voice signal, is accomplished the noise elimination processing;
4. through the voice time delay module voice are carried out delay process, the sound of avoiding sound that loud speaker enters and microphone to gather is overlapping, can't very accurately confirm echo signal;
5. can guarantee to be connected use through output, input COBBAIF module, comprise DVR, IP network video camera, recording capture card, optical transceiver etc. with different rear end audio collecting devices.
Description of drawings
Fig. 1 is a product structure sketch map of the present invention;
Fig. 2 is the structure principle chart of echo cancellation module of the present invention;
Fig. 3 is the structure principle chart of noise reduction noise elimination module of the present invention;
Fig. 4 is the structure principle chart of voice time delay module of the present invention;
Sign is as follows among Fig. 2:
The input of x (n) far-end reference signal;
The echo signal that k (n) microphone picks up;
People's acoustic noise that s (n) microphone picks up;
Y (n) microphone picks up voice voice signal y (n)=s (n)+k (n);
E (n) adaptive-filtering echo is eliminated back voice voice signal e (n)=y (n)-w (n);
E ' (n) echo eliminate back voice voice signal e ' (n)=(n)-w ' (n) for e;
E ' (n) is infinitely close to s (n), also just reaches the function that echo is eliminated.
Embodiment
Through specific embodiment the present invention is done further explain below, but be not restriction protection range of the present invention.
Embodiment 1
Like Fig. 1,2,3, shown in 4; A kind of echo is eliminated the double-directional speech talk back equipment; Comprise audio frequency input module, loudspeaker driver module, echo cancellation module, noise reduction noise elimination module, voice time delay module and audio frequency output module; The output of audio frequency input module is connected with the input of loudspeaker driver module and echo cancellation module respectively; The output of echo cancellation module is connected with the input of noise reduction noise elimination module, and the output of noise reduction noise elimination module is connected with the input of voice time delay module, and the output of voice time delay module is connected with the input of audio frequency output module.The audio frequency input module comprises voice signal input module, audio input interface module, electrostatic defending module and level signal automatic regulating module.Echo cancellation module comprises sef-adapting filter echo cancellation module and Nonlinear Processing module.Noise reduction noise elimination module comprises front end voice signal input module, time-domain and frequency-domain noise analysis module, noise suppression module, audio power detection module and voice signal output control module.The voice time delay module comprises digital signal processor module, first memory module and second memory module.The audio frequency output module comprises voice signal output module, audio output interface module, isolates output module and follows output module.
Embodiment 2
Like Fig. 1,2, shown in 3, echo is eliminated the double-directional speech talk back equipment needs the outside to have the two-way voice signal to carry out alternately, and one the tunnel is up sound; One the tunnel is descending sound, owing to possibly be connected with different audio frequency apparatuses, so all added special input here; Output interface module, the protection of a circuit is carried out in main inside, comprises electrostatic defending; Signal reversal connection protection etc. also comprise impedance matching circuit, can the input and output impedance different with the outside be connected; And the audio gain adjusting, can adjust the audio volume size, guarantee normal operation.Descending sound is through after the audio frequency input module, and one the tunnel gives the loudspeaker driver module, and driving loudspeaker can play sound, and one the tunnel inputs to echo cancellation module as the audioref signal, as the assurance of the normal operation of echo cancellation performance.Echo cancellation module is according to the signal of microphone collection and the signal of coming with reference to feedback; Carry out automatic gain control; Adaptive filter algorithm control, the work of softwares such as noise reduction process algorithm controls guarantees that echo cancellation performance normally carries out; The audio frequency of output is essentially voice signal actual in the environment then, rather than the voice signal of exporting in the loudspeaker.In order to access better tonequality and lower noise can be arranged; Through noise reduction process, some unnecessary low noise echoes are eliminated totally, and the noise elimination treatment circuit can be arranged; When detecting actual speech signal when very low; Directly close audio frequency output, have only when voice occurs once more in the environment of waiting until, voice signal output just occurs.And passing to the audio frequency output module carries out audio frequency coupling and exports to the equipment of rear end.
Embodiment 3
Like Fig. 1,2, shown in 3, a kind of echo is eliminated the double-directional speech talk back equipment, and voice signal transfers to loudspeaker driver module and echo cancellation module through the audio frequency input module.
Echo cancellation module comprises sef-adapting filter echo cancellation module and Nonlinear Processing module.The sef-adapting filter echo cancellation module is at first carried out echo elimination; And spiking often can't be eliminated fully; Back one-level Nonlinear Processing is primarily aimed at previous stage and does not eliminate completely echo and carry out echo elimination, mainly eliminates the spiking of echo, just the energy loca.The two cooperates, owing to there is the echo of back one-level to eliminate, shortens operate time so can the echo of previous stage be eliminated, and can suitably must echo be omitted out, carries out spiking with the back shorter time of one-level then and eliminates.Can be shortened the operate time of echo, increase the two-way call ability.The operate time that both processing times are eliminated software less than other echo.After voice signal carries out echo cancellation process, transfer to noise reduction noise elimination module.
Noise reduction noise elimination module comprises front end voice signal input module, time-domain and frequency-domain noise analysis module, noise suppression module, audio power detection module and voice signal output control module.Noise reduction noise elimination module is accomplished echo is eliminated voice signal processing afterwards.Handle comprising the voice signal, ambient noise signal and the echo signal that are being mingled with in the voice signal, analyze, noise is reduced 10dB, remove ambient noise wherein, also further reduce the echo noise through time domain and frequency domain noise analysis module.Through built-in voice signal calculating energy value, when its value is set numerical value less than certain, close audio frequency output, reach the noise elimination effect, just quiet at environment, during nobody speech, it does not have any signal output, reaches the noiseless effect.Accomplish the noise elimination processing when not having voice signal, mainly contain two benefits, one is the loud speaker in a distant place, can not make a sound by magnetic magnetic because of noise, and noise suppression module, no environment noise, for the noise suppression algorithm of far-end, processing signals is comparatively simple.Key issue is when when squelch circuit closes audio frequency output, open audio frequency output.Voice signal transfers to the voice time delay module after carrying out the processing of noise reduction noise elimination.
The voice time delay module comprises digital signal processor module, first memory module and second memory module.Because the voice call equipment of rear end exists difference, a lot of equipment in the DAB exchange process, exist the situation of line echo at analogue audio frequency own; This situation can cause the voice signal after echo is eliminated directly just to output on the loudspeaker, does not have any delay, when the people talks like this; Voice just appears in loud speaker, and shorter if front-end echo is eliminated the processing time, the sound that causes loud speaker to be entered is overlapping with the sound of microphone collection; Can't very accurately confirm echo signal; So need the voice time-delay, voice signal could be exported from loud speaker after need delaying time at the soonest; Handle all finish like this early stage of echo cancellation module, the voice that can separately go directly still are the loud speaker voice.The noise reduction noise elimination module of its work and front is integrated in the digital signal processor together; Its operation principle is following: voice signal stores in first memory module delay of waiting for a period of time earlier into after handling; The output of first memory module is moved in second memory module; According to the output of the voice signal in second memory module, a time-delay handling process is so just arranged then, reach the voice latency effect.After the delay process through the voice time delay module, voice signal is reached the audio frequency output module.
The audio frequency output module comprises voice signal output module, audio output interface module, isolates output module and follows output module.Output module, with output impedance transfer as far as possible little, and use and isolate output module and follow output module, increase the driving force of output; And, output gain is regulated according to different distances.The voice signal that output at last disposes.
Claims (6)
1. an echo is eliminated talk back equipment; It is characterized in that: comprise audio frequency input module, loudspeaker driver module, echo cancellation module, noise reduction noise elimination module, voice time delay module and audio frequency output module; The output of audio frequency input module is connected with the input of loudspeaker driver module and echo cancellation module respectively; The output of echo cancellation module is connected with the input of noise reduction noise elimination module; The output of noise reduction noise elimination module is connected with the input of voice time delay module, and the output of voice time delay module is connected with the input of audio frequency output module.
2. echo according to claim 1 is eliminated talk back equipment, and it is characterized in that: described noise reduction noise elimination module comprises front end voice signal input module, time-domain and frequency-domain noise analysis module, noise suppression module, audio power detection module and audio signal output control module.
3. echo according to claim 1 is eliminated talk back equipment, and it is characterized in that: described audio frequency input module comprises audio signal input module, audio input interface module, electrostatic defending module and level signal automatic regulating module.
4. echo according to claim 1 is eliminated talk back equipment, and it is characterized in that: described echo cancellation module comprises sef-adapting filter echo cancellation module and Nonlinear Processing module.
5. echo according to claim 1 is eliminated talk back equipment, and it is characterized in that: described voice time delay module comprises digital signal processor module, first memory module and second memory module.
6. echo according to claim 1 is eliminated talk back equipment, and it is characterized in that: described audio frequency output module comprises audio signal output module, audio output interface module, isolates output module and follows output module.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117083A (en) * | 2012-11-05 | 2013-05-22 | 青岛海信电器股份有限公司 | Audio information acquisition device and method |
| CN105825862A (en) * | 2015-01-05 | 2016-08-03 | 沈阳新松机器人自动化股份有限公司 | Robot man-machine dialogue echo cancellation system |
| CN105825865A (en) * | 2016-03-10 | 2016-08-03 | 福州瑞芯微电子股份有限公司 | Echo cancellation method under noise environment and echo cancellation system thereof |
| CN106303878A (en) * | 2015-05-22 | 2017-01-04 | 成都鼎桥通信技术有限公司 | One is uttered long and high-pitched sounds and is detected and suppressing method |
| CN106488052A (en) * | 2015-08-27 | 2017-03-08 | 成都鼎桥通信技术有限公司 | One kind is uttered long and high-pitched sounds scene recognition method and equipment |
| CN110320663A (en) * | 2019-03-20 | 2019-10-11 | 华中科技大学 | The big bandwidth mode filter of super-small based on the design of direct binary search algorithm |
| CN111901704A (en) * | 2020-06-16 | 2020-11-06 | 深圳市麦驰安防技术有限公司 | Audio data processing method, device, equipment and computer readable storage medium |
| CN116647634A (en) * | 2023-07-27 | 2023-08-25 | 河北跃创科技有限公司 | Broadcasting intercom terminal |
-
2012
- 2012-03-12 CN CN2012200888620U patent/CN202475574U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117083B (en) * | 2012-11-05 | 2016-05-25 | 贵阳海信电子有限公司 | A kind of audio-frequency information harvester and method |
| CN103117083A (en) * | 2012-11-05 | 2013-05-22 | 青岛海信电器股份有限公司 | Audio information acquisition device and method |
| CN105825862A (en) * | 2015-01-05 | 2016-08-03 | 沈阳新松机器人自动化股份有限公司 | Robot man-machine dialogue echo cancellation system |
| CN106303878A (en) * | 2015-05-22 | 2017-01-04 | 成都鼎桥通信技术有限公司 | One is uttered long and high-pitched sounds and is detected and suppressing method |
| CN106488052A (en) * | 2015-08-27 | 2017-03-08 | 成都鼎桥通信技术有限公司 | One kind is uttered long and high-pitched sounds scene recognition method and equipment |
| CN105825865B (en) * | 2016-03-10 | 2019-09-27 | 福州瑞芯微电子股份有限公司 | Echo cancel method and system under noise circumstance |
| CN105825865A (en) * | 2016-03-10 | 2016-08-03 | 福州瑞芯微电子股份有限公司 | Echo cancellation method under noise environment and echo cancellation system thereof |
| CN110320663A (en) * | 2019-03-20 | 2019-10-11 | 华中科技大学 | The big bandwidth mode filter of super-small based on the design of direct binary search algorithm |
| CN110320663B (en) * | 2019-03-20 | 2020-12-01 | 华中科技大学 | Ultra-small-size large-bandwidth mode filter designed based on direct binary search algorithm |
| CN111901704A (en) * | 2020-06-16 | 2020-11-06 | 深圳市麦驰安防技术有限公司 | Audio data processing method, device, equipment and computer readable storage medium |
| CN111901704B (en) * | 2020-06-16 | 2022-07-22 | 深圳市麦驰安防技术有限公司 | Audio data processing method, device, equipment and computer readable storage medium |
| CN116647634A (en) * | 2023-07-27 | 2023-08-25 | 河北跃创科技有限公司 | Broadcasting intercom terminal |
| CN116647634B (en) * | 2023-07-27 | 2024-03-12 | 河北跃创科技有限公司 | Broadcasting intercom terminal |
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Owner name: YU XINDE Free format text: FORMER OWNER: HANGZHOU ELITE AUDIO TECHNOLOGY CO., LTD. Effective date: 20140214 |
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Free format text: CORRECT: ADDRESS; FROM: 310024 HANGZHOU, ZHEJIANG PROVINCE TO: 310000 HANGZHOU, ZHEJIANG PROVINCE |
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Effective date of registration: 20140214 Address after: 310000 room 68, Lane 805, Feng Sheng Road, Zhejiang, Hangzhou Patentee after: Ren Junjun Address before: 310024 room 129, No. 217 ho Wan Road, Xihu District, Zhejiang, Hangzhou Patentee before: Hangzhou Elite Audio Technology Co.,Ltd. |
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Effective date of registration: 20191113 Address after: 310000 Eastern District, Building 2, Building 4, No. 1 Longquan Road, Cangqian Street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou elite Digital Technology Co., Ltd. Address before: 310000 room 68, Lane 805, Feng Sheng Road, Zhejiang, Hangzhou Patentee before: Ren Junjun |
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Granted publication date: 20121003 |