CN110310653A - A kind of echo cancel method - Google Patents
A kind of echo cancel method Download PDFInfo
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- CN110310653A CN110310653A CN201910614817.0A CN201910614817A CN110310653A CN 110310653 A CN110310653 A CN 110310653A CN 201910614817 A CN201910614817 A CN 201910614817A CN 110310653 A CN110310653 A CN 110310653A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
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Abstract
The invention discloses a kind of echo cancel methods.Existing method uses merely acoustic echo canceller, cannot be completely eliminated echo, all reflective residual of the output of acoustic echo canceller.The method of the present invention is realized by low-pass filter, loudspeaker, acoustic echo canceller, microphone, high-pass filter, Energy extraction module, energy comparison module, comfort noise generation module, near-end voice signals generation module.It is filtered first to needing to play voice, by filtered voice as reference sound；It plays and refers to sound；Judgement is said when the high-frequency energy progress of microphone is double；According to double speaking state, different disposal is carried out to residual signals.The method of the present invention realizes simultaneously realizes low echo and the higher voice quality closely said of reservation.Implementation of the present invention is simple, and calculation amount is low, and low echo residual can be realized in the low embedded device for calculating power while retaining the higher voice quality closely said.
Description
Technical field
The invention belongs to voice data processing technology field, tool is related to the echo cancellor side in a kind of echo cancellation process
Method.
Background technique
Echo is that the acoustical signal that loudspeaker plays is collected through Ambient and by microphone.Echo and current utterance person
The sound mix of sending is simultaneously transferred to distal end, influences the quality of reception of distal end.Traditional echo cancellation technology passes through merely acoustics
Echo Canceller is eliminated (such as Fig. 1) to echo.When distal end speaker speaks, his voice signal (far-end speech ref) is passed through
Telephone system or network system are transferred on proximal device as reference sound, with reference to sound be sent to proximal device loudspeaker a and
In acoustic echo canceller c.The sound that the sound and loudspeaker of proximal end speaker plays is picked up by the microphone b of proximal end together,
The sound that microphone picks up is sent in acoustic echo canceller c, is compared with original sampling, in the sound that microphone picks up
Sound only removes the sound of loudspeaker broadcasting.Part from loudspeaker broadcasting in the sound picked up due to microphone is that loudspeaker is broadcast
The convolution of the sound and echo path transmission function put.Usual acoustic echo canceller inputted using sef-adapting filter with it is defeated
The statistical property of signal is estimated as foundation out, automatically adjusts filter coefficient using NLMS or other algorithms, use is adaptive
The coefficient approximate evaluation of filter is answered to go out echo path transmission function.To which acoustic echo canceller calculates microphone pickup
The sound played in sound from loudspeaker, and it is subtracted in the sound that microphone picks up, to obtain proximal end speaker
Sound (near-end speech x).Since physically echo path transmission function is continuous and indefinite length, acoustic echo is eliminated
Device can only carry out approximation with the filter coefficient of discrete finite length.So acoustic echo canceller cannot be completely eliminated back
Sound, all reflective residual of the output of acoustic echo canceller.
In order to reduce echo residual, a kind of general practice is to carry out people from proximal end to speak detection.When there is no proximal end people to speak,
Acoustic echo canceller exports comfort noise.But the frequency spectrum due to far-end speech is Chong Die with the spectral bandwidth of proximal end human speech sound,
Spectral shape is close, people from proximal end speak detection difficulty it is big, accuracy rate is not high, causes to have damage the voice closely said, influences people
Sense of hearing.
In addition the high algorithm of quality is realized complicated, and high calculating high power consumption is not available in the low embedded device for calculating power
Echo cancellation algorithm, cause to realize to remain in low echo and realize again and retain the higher voice quality closely said.
Summary of the invention
It is an object of the invention to provide a kind of echo cancel methods, realize low echo in the low embedded device for calculating power
With the higher voice quality closely said of reservation.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions:
Echo cancel method of the invention passes through low-pass filter, loudspeaker, acoustic echo canceller, microphone, high pass
Filter, Energy extraction module, energy comparison module, comfort noise generation module, near-end voice signals generation module are realized.
Specifically: far-end speech ref inputs low-pass filter, and the output end of low-pass filter is separately connected the letter of loudspeaker
One signal input part of number input terminal and acoustic echo canceller, low-pass filter are provided with cutoff frequency Fc, low-pass filtering
Device will be higher than the target signal filter of Fc frequency in far-end speech, leave behind lower than the signal equal to Fc frequency, reach loudspeaker harmony
Echo Canceller is learned, the signal after low-pass filtering is converted into sound and played by loudspeaker；The far-end speech ref is by distal end
The voice signal that communication system is sent.
The signal output end of microphone be separately connected high-pass filter signal input part and acoustic echo canceller it is another
The voice of echo and proximal end speaker that loudspeaker plays is converted into electric signal and exported by one signal input part, microphone.
High-pass filter is provided with frequency Fp, retains the signal for being optionally greater than Fp frequency, will be less than the letter of Fp frequency
It number filters out, Fp > Fc.
The signal input part of the signal output end connection Energy extraction module of high-pass filter, Energy extraction module extract letter
Number ENERGY E,N is the quantity of continuous input signal, and m is the amplitude of input signal；The letter of Energy extraction module
The signal input part of number output end connection energy comparison module.
Acoustic echo canceller, energy comparison module, comfort noise generation module output end connect near-end voice signals
The output end of the signal input part of generation module, near-end voice signals generation module exports near-end speech x；The comfort noise
Generation module generates random noise, i.e. random number series.
Energy comparison module, which is provided with, compares threshold values THD, when energy is more than or equal to THD, output 1；When energy is less than THD
When, output 0；With the average value of all energy in initialization time T as initial value THD, later every voice for inputting a frame
THD update is carried out after data；Updated relatively threshold values THD=k × (High+Low), High are all more than or equal to THD's
The average value of energy, Low are the average value of all energy less than THD, k < 1, preferably, k=0.1~0.9.
Near-end voice signals generation module generates the voice signal for being back to distal end according to following rule:
When the output of energy comparison module is 1, the output of acoustic echo canceller is selected；
When the output of energy comparison module is 0, the output of comfort noise module is selected.
Since the voice that loudspeaker plays does not include the information higher than Fc frequency, and people from proximal end speaks and records through microphone
And the voice through high pass filter filters only includes optionally greater than the information of Fp frequency.Due to Fp > Fc, according to high-pass filter
The energy size of the voice of filtering can interpretation whether there is people from proximal end to speak: when the energy of the voice of high pass filter filters is big
When (energy is more than or equal to THD), it is believed that there is people from proximal end to speak, the output of acoustic echo canceller remains the higher language closely said
Sound quality then selects the output of acoustic echo canceller；When the energy of the voice of high pass filter filters is small (energy is less than THD)
When, it is believed that no people from proximal end speaks, then selects the output of the remaining comfort noise of echoless.
The highest frequency of voice signal can achieve 20KHz.But the energy of voice signal is concentrated mainly on low frequency part,
The high frequency section energy of voice is filtered out to the acoustical quality that will not significantly affect people with low-pass filter.Such as the voice of telephone system
Frequency range is 300Hz to 3400Hz, and the voice frequency range of amplitude modulation broadcasting quality is 50Hz to 7KHz, frequency modulation broadcasting quality
Voice frequency range is 20Hz to 15KHz.Reasonably select the cutoff frequency Fc of low-pass filter, the voice that will distally transmit
Signal carries out low-pass filtering, would not obviously damage the quality of the voice of Near end speaker broadcasting.
The voice signal distally transmitted is carried out low-pass filtering by the present invention, hurts what Near end speaker played unobvious
In the case where the quality of voice, it is poor that the frequency range for the voice for enabling the frequency range of the echo of loudspeaker and people from proximal end speak generates
Different, there has also been obvious differences for their spectral shape.This species diversity can simply and be accurately extracted using high-pass filter.
It can precisely detect whether people from proximal end speaks in this way, to realize the language for retaining proximal end people in high quality while going echo
Sound.The method of the present invention realizes simultaneously realizes low echo and the higher voice quality closely said of reservation.Implementation letter of the present invention
Single, calculation amount is low, and low echo residual can be realized in the low embedded device for calculating power while retaining the higher language closely said
Sound quality.
Detailed description of the invention
Fig. 1 is traditional echo cancel method schematic diagram；
Fig. 2 is the method for the present invention schematic diagram.
Specific embodiment
To facilitate the understanding of the present invention, in order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, under
In conjunction with attached drawing, specific embodiments of the present invention will be described in detail in face.It is explained in the following description many details
To facilitate a thorough understanding of the present invention, giving better embodiment of the invention in attached drawing.But the present invention can be with many not
With form realize, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making
It makes the present disclosure more fully understandable.The present invention can be to be much different from other way described herein
Implement, those skilled in the art can make similar improvements without departing from the spirit of the invention, therefore the present invention not by
The limitation of following public specific embodiment.
Such as Fig. 2, a kind of echo cancel method passes through low-pass filter 1, loudspeaker 2, acoustic echo canceller 3, microphone
4, high-pass filter 5, Energy extraction module 6, energy comparison module 7, comfort noise generation module 8, near-end voice signals generate
Module 9 is realized.It is specific as follows:
Far-end speech ref inputs low-pass filter 1, and the signal that the output end of low-pass filter 1 is separately connected loudspeaker 2 is defeated
Enter a signal input part of end and acoustic echo canceller 3, low-pass filter 1 is provided with a cutoff frequency Fc, low pass filtered
Wave device 1 will be higher than the target signal filter of Fc frequency in far-end speech, leave behind lower than the signal equal to Fc frequency, reach loudspeaker 2
With acoustic echo canceller 3, the signal after low-pass filtering is converted into sound and played by loudspeaker 2；The far-end speech ref is
The voice signal sent by remote communication system；
The signal output end of microphone 4 is separately connected the signal input part and acoustic echo canceller 3 of high-pass filter 5
Another signal input part, it is defeated that the voice of echo and proximal end speaker that loudspeaker 2 plays is converted into electric signal by microphone 4
Out.
The voice telecommunication number of far-end speech ref signal and microphone 4 after low-pass filtering inputs acoustic echo canceller 3,
It is handled using existing echo cancel method.
High-pass filter 5 is provided with one by frequency Fp, retains the signal for being optionally greater than Fp frequency, will be less than Fp frequency
Target signal filter, Fp > Fc；
The signal input part of the signal output end connection Energy extraction module 6 of high-pass filter 5, Energy extraction module 6 mention
The ENERGY E for the number of winning the confidence,N is the quantity of continuous input signal, and m is the amplitude of input signal；
The signal input part of the signal output end connection energy comparison module 7 of Energy extraction module 6；Acoustic echo canceller
3, energy comparison module 7, comfort noise generation module 8 output end connection near-end voice signals generation module 9 signal input
The output end at end, near-end voice signals generation module 9 exports near-end speech x.
Energy comparison module 7 is provided with a comparison threshold values THD, when energy is more than or equal to THD, output 1；When energy is small
When THD, output 0.With the average value of all energy in initialization time T as initial value THD, every input one frame later
THD update is carried out after voice data；Updated relatively threshold values THD=k × (High+Low), High are all greater than THD's
The average value of energy, Low are the average value of all energy less than THD, k=0.1~0.9, k=0.5 in the present embodiment.
Comfort noise generation module 8 generates random noise, i.e. random number series.
Near-end voice signals generation module 9 generates the voice signal for being back to distal end according to following rule:
When the output of energy comparison module 7 is 1, i.e., when the energy of the voice of high pass filter filters is big, it is believed that have
People from proximal end speaks, and the output of acoustic echo canceller remains the higher voice quality closely said, selects acoustic echo canceller 3
Output；When the output of energy comparison module 7 is 0, i.e., when the energy of the voice of high pass filter filters is small, it is believed that do not have
People from proximal end speaks, then selects the output of the remaining comfort noise of echoless, that is, select the output of comfort noise module 8.
Claims (2)
1. a kind of echo cancel method, it is characterised in that: this method passes through low-pass filter (1), loudspeaker (2), acoustic echo
Arrester (3), microphone (4), high-pass filter (5), Energy extraction module (6), energy comparison module (7), comfort noise are raw
It is realized at module (8), near-end voice signals generation module (9)；It is specific as follows:
Far-end speech ref inputs low-pass filter (1), and the output end of low-pass filter (1) is separately connected the signal of loudspeaker (2)
One signal input part of input terminal and acoustic echo canceller (3), low-pass filter are provided with cutoff frequency Fc, low-pass filtering
Device (1) will be higher than the target signal filter of Fc frequency in far-end speech, leave behind lower than the signal equal to Fc frequency, reach loudspeaker
(2) signal after low-pass filtering is converted into sound and is played with acoustic echo canceller (3), loudspeaker (2)；The distal end language
Sound ref is the voice signal sent by remote communication system；
The signal output end of microphone (4) is separately connected the signal input part and acoustic echo canceller (3) of high-pass filter (5)
Another signal input part, the voice of echo that loudspeaker (2) plays and proximal end speaker is converted into telecommunications by microphone (4)
Number output；
High-pass filter (5) is provided with frequency Fp, retains the signal for being optionally greater than Fp frequency, will be less than the signal of Fp frequency
It filters out, Fp > Fc；
The signal input part of signal output end connection Energy extraction module (6) of high-pass filter (5), Energy extraction module (6)
The ENERGY E of signal is extracted,N is the quantity of continuous input signal, and m is the amplitude of input signal；Energy extraction mould
The signal input part of signal output end connection energy comparison module (7) of block (6)；
Acoustic echo canceller (3), energy comparison module (7), comfort noise generation module (8) output end connect near-end speech
The output end of the signal input part of signal generation module (9), near-end voice signals generation module (9) exports near-end speech x；It is described
Comfort noise generation module (8) generate random noise, i.e. random number series；
Energy comparison module (7), which is provided with, compares threshold values THD, when energy is more than or equal to THD, output 1；When energy is less than THD
When, output 0；With the average value of all energy in initialization time T as initial value THD, later every voice for inputting a frame
THD update is carried out after data；Updated relatively threshold values THD=k × (High+Low), High are all more than or equal to THD's
The average value of energy, Low are the average value of all energy less than THD, k < 1；
Near-end voice signals generation module (9) generates the voice signal for being back to distal end according to following rule:
When the output of energy comparison module (7) is 1, the output of acoustic echo canceller (3) is selected；
When the output of energy comparison module (7) is 0, the output of comfort noise module (8) is selected.
2. a kind of echo cancel method as described in claim 1, it is characterised in that: k=0.1~0.9.
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| CN110782914A (en) * | 2019-10-31 | 2020-02-11 | 网易（杭州）网络有限公司 | Signal processing method and device, terminal equipment and storage medium |
| CN110995950A (en) * | 2019-11-08 | 2020-04-10 | 杭州觅睿科技有限公司 | Echo cancellation self-adaption method based on PC (personal computer) end and mobile end |
| CN111294474A (en) * | 2020-02-13 | 2020-06-16 | 杭州国芯科技股份有限公司 | Double-end call detection method |
| CN111524532A (en) * | 2020-04-29 | 2020-08-11 | 展讯通信（上海）有限公司 | Echo suppression method, device, equipment and storage medium |
| CN112037808A (en) * | 2020-09-01 | 2020-12-04 | 杭州岁丰信息技术有限公司 | Echo eliminating method and device for elevator car |
| CN112929722A (en) * | 2021-03-31 | 2021-06-08 | 杭州国芯科技股份有限公司 | External device for voice control of set top box |
| CN118100981A (en) * | 2024-04-19 | 2024-05-28 | 南京仁芯科技有限公司 | Echo cancellation method for full duplex high-speed wired communication, transceiver system and chip |
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| CN110782914B (en) * | 2019-10-31 | 2022-04-15 | 网易（杭州）网络有限公司 | Signal processing method and device, terminal equipment and storage medium |
| CN110995950A (en) * | 2019-11-08 | 2020-04-10 | 杭州觅睿科技有限公司 | Echo cancellation self-adaption method based on PC (personal computer) end and mobile end |
| CN111294474A (en) * | 2020-02-13 | 2020-06-16 | 杭州国芯科技股份有限公司 | Double-end call detection method |
| CN111294474B (en) * | 2020-02-13 | 2021-04-16 | 杭州国芯科技股份有限公司 | Double-end call detection method |
| CN111524532A (en) * | 2020-04-29 | 2020-08-11 | 展讯通信（上海）有限公司 | Echo suppression method, device, equipment and storage medium |
| CN112037808A (en) * | 2020-09-01 | 2020-12-04 | 杭州岁丰信息技术有限公司 | Echo eliminating method and device for elevator car |
| CN112037808B (en) * | 2020-09-01 | 2024-04-19 | 杭州岁丰信息技术有限公司 | Echo cancellation method and device for elevator car |
| CN112929722A (en) * | 2021-03-31 | 2021-06-08 | 杭州国芯科技股份有限公司 | External device for voice control of set top box |
| CN112929722B (en) * | 2021-03-31 | 2024-05-28 | 杭州国芯科技股份有限公司 | External equipment for voice control of set top box |
| CN118100981A (en) * | 2024-04-19 | 2024-05-28 | 南京仁芯科技有限公司 | Echo cancellation method for full duplex high-speed wired communication, transceiver system and chip |
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