CN105657110A - Voice communication echo cancellation method and device - Google Patents
Voice communication echo cancellation method and device Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/20—Arrangements for preventing acoustic feed-back
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
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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 voice communication echo cancellation method. The method comprises the steps that when receiving far-end voice signals transmitted by far-end equipment, near-end equipment plays the received far-end voice signals and obtains frequency points appearing most frequently in the far-end voice signals; the near-end equipment collects near-end sound to form near-end sound signals; according to the obtained frequency points appearing most frequently, the near-end voice signals are subjected to echo cancellation, and after echo cancellation is carried out, the near-end voice signals are transmitted to the far-end equipment. The invention further provides a voice communication echo cancellation device. Echoes generated in the voice communication process are cancelled, and communication voice quality is improved.
Description
Technical field
The present invention relates to voice communication technology field, particularly relate to echo cancel method and the device of a kind of voice communication.
Background technology
Along with the development of mobile terminal technology, the application of mobile terminal also comes more extensive, and function is also from strength to strength. mobile terminal is usually provided with speaker and mike, wherein, mike be typically provided with seal structure, with prevent speaker the incoming mike of sound in and cause opposite end echogenicity. but, when actually used, the reasons such as bad are assembled owing to producing, there will be the situation that the sealing of the sealing structure of the mike of mobile terminal is poor, cause that the sound that the far-end that speaker is play is transmitted through can be passed in mike, so, when user uses this mobile terminal and other users to carry out voice communication, the other side can hear the sound of speaking of himself, this has just become acoustic echo, if echo is not processed, speech quality and Consumer's Experience will be affected, more serious also can form concussion, generation is uttered long and high-pitched sounds, seriously reduce call voice quality.
Summary of the invention
The present invention provides echo cancel method and the device of a kind of voice communication, and its main purpose is in that to eliminate the echo produced in voice call process, improves call voice quality.
For achieving the above object, the present invention provides the echo cancel method of a kind of voice communication, and the echo cancel method of this voice communication includes:
When proximal device receives the far-end speech signal of remote equipment transmission, play the described far-end speech signal received, and obtain the frequency that in described far-end speech signal, occurrence number is maximum;
Described proximal device gathers near-end sound and forms near-end voice signals;
According to the frequency that the described occurrence number got is maximum, described near-end voice signals is carried out echo cancellor, the described near-end voice signals after echo cancellor is sent to described remote equipment.
Preferably, in the described far-end speech signal of described acquisition, the step of the frequency that occurrence number is maximum includes:
According to default cut-off frequency interval, described far-end speech signal being carried out bandpass filtering treatment, obtain voice voice signal, wherein, described default cut-off frequency interval is people's acoustic frequency scope;
Count the frequency that in described voice voice signal, occurrence number is maximum.
Preferably, before described near-end voice signals is carried out the step of echo cancellor by the frequency that described occurrence number that described basis gets is maximum, the echo cancel method of described voice communication further comprises the steps of:
Judge whether the near-end sound that described proximal device collects comprises and play the sound that described far-end speech signal produces;
When the near-end sound that described proximal device collects comprises the sound playing the generation of described far-end speech signal, perform according to the frequency that the described occurrence number got is maximum, described near-end voice signals to be carried out the step of echo cancellor;
When not comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, the described near-end voice signals that will collect sends to described remote equipment.
Preferably, before described near-end voice signals is carried out the step of echo cancellor by the frequency that described occurrence number that described basis gets is maximum, the echo cancel method of described voice communication further comprises the steps of:
Judge that whether the signal intensity of described far-end speech signal is more than the first preset signal strength, and whether the signal intensity of described near-end voice signals is more than the second preset signal strength;
When the signal intensity of described far-end speech signal is more than described first preset signal strength, and the signal intensity of described near-end voice signals more than described second preset signal strength time, perform the maximum frequency of described occurrence number that described basis gets and described near-end voice signals is carried out the step of echo cancellor, otherwise, the described near-end voice signals collected sends to described remote equipment.
Preferably, whether the described signal intensity judging described far-end speech signal includes more than the step of the first preset signal strength:
After described far-end speech signal is carried out windowing process, carry out Fourier transform and obtain the frequency domain power spectrum of described far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band;
When there being the power spectrum of described sub-band of preset number more than predetermined threshold value, judge that the signal intensity of described far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of described far-end speech signal is less than described first preset signal strength.
Additionally, for achieving the above object, the present invention also provides for the echo cancelling device of a kind of voice communication, and the echo cancelling device of this voice communication includes:
Voice playing module, when being used for the far-end speech signal receiving remote equipment transmission, plays the described far-end speech signal received;
Frequency acquisition module, when being used for the far-end speech signal receiving remote equipment transmission, obtains the frequency that in described far-end speech signal, occurrence number is maximum;
Signal acquisition module, is used for gathering near-end sound and forms near-end voice signals;
Echo cancellation module, carries out echo cancellor for the frequency maximum according to the described occurrence number got to described near-end voice signals;
Signal transmitting module, for sending the described near-end voice signals after echo cancellor to described remote equipment.
Preferably, described frequency acquisition module includes:
Signal filtering unit, for described far-end speech signal being carried out bandpass filtering treatment according to default cut-off frequency interval, obtains voice voice signal, and wherein, described default cut-off frequency interval is people's acoustic frequency scope;
Frequency statistic unit, for counting the frequency that in described voice voice signal, occurrence number is maximum.
Preferably, the echo cancelling device of described voice communication also includes:
Judge module, plays, for judging whether to comprise in the near-end sound that described proximal device collects, the sound that described far-end speech signal produces;
Described echo cancellation module, is additionally operable to, when comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, according to the frequency that the described occurrence number got is maximum, described near-end voice signals be carried out echo cancellor;
Described signal transmitting module, is additionally operable to when not comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, and the described near-end voice signals that will collect sends to described remote equipment.
Preferably, the echo cancelling device of described voice communication also includes:
Whether signal judge module, be used for the signal intensity judging described far-end speech signal more than the first preset signal strength, and whether the signal intensity of described near-end voice signals be more than the second preset signal strength;
Described echo cancellation module, it is additionally operable to the signal intensity working as described far-end speech signal more than described first preset signal strength, and the signal intensity of described near-end voice signals more than described second preset signal strength time, according to the frequency that the described occurrence number got is maximum, described near-end voice signals is carried out echo cancellor;
Described signal transmitting module, it is additionally operable to the signal intensity working as described far-end speech signal less than or equal to described first preset signal strength, or when the signal intensity of described near-end voice signals is less than or equal to described second preset signal strength, the described near-end voice signals collected is sent to described remote equipment.
Preferably, described signal judge module includes:
Signal processing unit, after described far-end speech signal is carried out windowing process, carries out Fourier transform and obtains the frequency domain power spectrum of described far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band;
Signal judging unit, for when there being the power spectrum of described sub-band of preset number more than predetermined threshold value, judge that the signal intensity of described far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of described far-end speech signal is less than described first preset signal strength.
The echo cancel method of the voice communication that the present invention proposes and device, proximal device is when receiving the far-end speech signal of remote equipment transmission, play this far-end speech signal, and obtain the frequency that in this far-end speech signal, occurrence number is maximum, while proximal device plays said distal ends voice signal, its mike gathers near-end sound and forms near-end voice signals, then according to the frequency that occurrence number is maximum, near-end voice signals is carried out echo cancellor, near-end voice signals after echo cancellor is sent to above-mentioned remote equipment, the sound of said distal ends voice signal is play owing to the near-end sound that collects being likely to include proximal device speaker, the present invention is through carrying out echo cancellation process to near-end voice signals, eliminate the proximal device speaker comprised in near-end voice signals and play the sound that far-end speech signal produces, to be again sent to remote equipment after avoiding collecting proximal device the far-end speech signal of broadcasting, echo is formed at remote equipment place, improve the voice quality in voice communication.
Accompanying drawing explanation
Fig. 1 is the flow chart of the echo cancel method first embodiment of voice communication of the present invention;
Fig. 2 is the refinement schematic flow sheet of the echo cancel method first embodiment intermediate-frequeney point obtaining step of voice communication of the present invention;
Fig. 3 is the high-level schematic functional block diagram of the echo cancelling device first embodiment of voice communication of the present invention;
Fig. 4 is the refinement high-level schematic functional block diagram of the echo cancelling device first embodiment intermediate-frequeney point acquisition module of voice communication of the present invention;
Fig. 5 is the high-level schematic functional block diagram of echo cancelling device second embodiment of voice communication of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
The present invention provides the echo cancel method of a kind of voice communication.
With reference to shown in Fig. 1, for the flow chart of the echo cancel method first embodiment of voice communication of the present invention.
In the first embodiment, the echo cancel method of this voice communication includes:
Step S10, when proximal device receives the far-end speech signal of remote equipment transmission, plays the described far-end speech signal received, and obtains the frequency that in described far-end speech signal, occurrence number is maximum;
Proximal device and remote equipment in the present embodiment can be able to carry out the terminal of real-time speech communicating, for instance the terminal such as mobile phone, panel computer, and terminal can include speaker, and described speaker is used for playing voice signal; Described terminal can include mike, and described mike is used for detecting acoustical signal, and wherein, described acoustical signal includes the voice signal that described speaker is play. It should be noted that, the proximal device of the following stated, remote equipment, near-end voice signals and far-end speech signal are comparatively speaking, it is not absolute, for instance, user A carries out voice call at use mobile phone with user B, so for user B, the mobile phone of its use is proximal device, and the mobile phone that user A uses is remote equipment, and for user A, the mobile phone of its use is proximal device, and the mobile phone that user B uses is remote equipment.
Proximal device is in the process carrying out voice call with remote equipment, proximal device is when receiving the far-end speech signal of remote equipment transmission, play the far-end speech signal received, simultaneously, this far-end speech signal is resolved, obtaining the frequency that occurrence number is maximum in far-end speech signal, the basic frequency being in far-end speech signal voice, for as the follow-up reference frequency carrying out echo cancellor.
Further, for the frequency that to be accurately obtained in far-end speech signal occurrence number maximum, with reference to shown in Fig. 2, step S10 can include following refinement step:
Step S11, carries out bandpass filtering treatment according to default cut-off frequency interval to described far-end speech signal, obtains voice voice signal, and wherein, described default cut-off frequency interval is people's acoustic frequency scope;
Step S12, counts the frequency that in described voice voice signal, occurrence number is maximum.
In one embodiment, by band filter, far-end speech signal can be carried out bandpass filtering treatment, to filter out in signal the noise except voice, obtain voice voice signal, in order to obtaining more accurate frequency point information, the default cut-off frequency interval of band filter can be voice frequency range, namely the audio frequency range that people can send, or general audio frequency range when people talks, for instance can be 50-5000Hz, or 500-5000Hz etc.After obtaining voice voice signal, count the frequency that in voice voice signal, occurrence number is maximum.
Further, the cut-off frequency that the sound that above-mentioned default cut-off frequency interval can be through remote subscriber is arranged after being analyzed in real time is interval.
Step S20, described proximal device gathers near-end sound and forms near-end voice signals;
Step S30, carries out echo cancellor according to the frequency that the described occurrence number got is maximum to described near-end voice signals, sends the described near-end voice signals after echo cancellor to described remote equipment.
Proximal device is while playing far-end speech signal, and its mike is also gathering near-end sound formation near-end voice signals, wherein, it is possible to can collect the sound played out in proximal device speaker.
Above-mentioned near-end voice signals is carried out echo cancellor, eliminate the signal that the maximum frequency of the above-mentioned occurrence number in near-end voice signals is corresponding, for example, it is possible to eliminate signal corresponding to the maximum frequency of occurrence number in far-end speech signal described in near-end voice signals to carry out echo cancellor by band filter. Or, according to the above-mentioned frequency got, far-end speech signal and echo cancellation algorithm, near-end voice signals is carried out echo cancellor.
Owing to proximal device is not all to collect the far-end speech signal that its speaker is play when voice call each time, therefore, further, before step S30, the echo cancel method of this voice communication is further comprising the steps of:
Judge whether the near-end sound that described proximal device collects comprises and play the sound that described far-end speech signal produces;
When the near-end sound that described proximal device collects comprises the sound playing the generation of described far-end speech signal, perform step S30;
When not comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, the described near-end voice signals that will collect sends to described remote equipment.
Before carrying out echo cancellor, first judge the sound whether having the far-end speech signal of its broadcasting to produce in the sound that proximal device collects, such as, the spectrogram of the near-end voice signals collected Yu said distal ends voice signal is carried out contrast judge, if, then perform step S30, if it is not, then directly the near-end voice signals of collection is sent to remote equipment.
It is possible to further arrange echo cancellor pattern for equipment, when user opens this pattern, perform above-mentioned steps S10-S30, when being made without echo cancellor, close this pattern.
The echo cancel method of the voice communication that the present embodiment proposes, proximal device is when receiving the far-end speech signal of remote equipment transmission, play this far-end speech signal, and obtain the frequency that in this far-end speech signal, occurrence number is maximum, while proximal device plays said distal ends voice signal, its mike gathers near-end sound and forms near-end voice signals, then according to the frequency that occurrence number is maximum, near-end voice signals is carried out echo cancellor, near-end voice signals after echo cancellor is sent to above-mentioned remote equipment, the sound of said distal ends voice signal is play owing to the near-end sound that collects being likely to include proximal device speaker, the present invention is through carrying out echo cancellation process to near-end voice signals, eliminate the proximal device speaker comprised in near-end voice signals and play the sound that far-end speech signal produces, to be again sent to remote equipment after avoiding collecting proximal device the far-end speech signal of broadcasting, echo is formed at remote equipment place, improve the voice quality in voice communication.
Second embodiment of echo cancel method of voice communication of the present invention is proposed based on the first embodiment of the echo cancel method of voice communication of the present invention. In the present embodiment, described method and first embodiment are distinctive in that, before step S30, the echo cancel method of this voice communication is further comprising the steps of:
Judge that whether the signal intensity of described far-end speech signal is more than the first preset signal strength, and whether the signal intensity of described near-end voice signals is more than the second preset signal strength;
When the signal intensity of described far-end speech signal is more than described first preset signal strength, and the signal intensity of described near-end voice signals more than described second preset signal strength time, perform the maximum frequency of described occurrence number that described basis gets and described near-end voice signals is carried out the step of echo cancellor, otherwise, the described near-end voice signals collected sends to described remote equipment.
When carrying out the judgement of signal intensity of far-end speech signal, it is possible to according to following steps:
After described far-end speech signal is carried out windowing process, carry out Fourier transform and obtain the frequency domain power spectrum of described far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band;
When there being the power spectrum of described sub-band of preset number more than predetermined threshold value, judge that the signal intensity of described far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of described far-end speech signal is less than described first preset signal strength.
Far-end speech signal is carried out windowing process, such as Hanning window, then Fourier transform is carried out, this far-end speech signal is made to be transformed into frequency domain from time domain, thus obtaining the frequency domain power spectrum of this far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band, preferably, in the present embodiment, described frequency domain power spectrum is divided into 32 sub-bands, wherein, the number of sub-band can be arranged according to the demand of user, if being divided into 32 sub-bands, the power spectral value of each sub-band can represent with a bit, altogether need 32 bits, the frequency spectrum of this voice signal then can be represented by the data type of 32. power spectrum and predetermined threshold value to each sub-band compare, wherein, predetermined threshold value and preset number all can by user setups, it is preferably 10-100db, when there being the power spectrum of sub-band of preset number more than predetermined threshold value, judge that the signal intensity of far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of far-end speech signal is less than the first preset signal strength.
Judgement about the signal intensity of near-end voice signals, it is possible to adopt the mode same with above-mentioned steps to judge, do not repeat them here.
The echo cancel method of the voice communication that the present embodiment proposes, before carrying out echo cancellor, first the signal intensity of the near-end voice signals of far-end speech signal is judged, when the signal intensity of far-end speech signal and near-end voice signals is all relatively larger, near end signal is carried out echo cancellation process, if the signal intensity having a side more weak (PLSCONFM when near-end voice signals is more weak, far-end speech signal is stronger the need of echo cancellor), the impact that then speech quality is produced by echo can be smaller, echo cancellor can not be carried out, to save resource.
The present invention also proposes the echo cancelling device of a kind of voice communication.
With reference to shown in Fig. 3, for the high-level schematic functional block diagram of the echo cancelling device first embodiment of voice communication of the present invention.
In this embodiment, the echo cancelling device of this voice communication includes:
Voice playing module 10, when being used for the far-end speech signal receiving remote equipment transmission, plays the described far-end speech signal received;
Frequency acquisition module 20, when being used for the far-end speech signal receiving remote equipment transmission, obtains the frequency that in described far-end speech signal, occurrence number is maximum;
Proximal device and remote equipment in the present embodiment can be able to carry out the terminal of real-time speech communicating, for instance the terminal such as mobile phone, panel computer, and terminal can include speaker, and described speaker is used for playing voice signal; Described terminal can include mike, and described mike is used for detecting acoustical signal, and wherein, described acoustical signal includes the voice signal that described speaker is play. It should be noted that, the proximal device of the following stated, remote equipment, near-end voice signals and far-end speech signal are comparatively speaking, it is not absolute, for instance, user A carries out voice call at use mobile phone with user B, so for user B, the mobile phone of its use is proximal device, and the mobile phone that user A uses is remote equipment, and for user A, the mobile phone of its use is proximal device, and the mobile phone that user B uses is remote equipment.
Proximal device is in the process carrying out voice call with remote equipment, proximal device is when receiving the far-end speech signal of remote equipment transmission, voice playing module 10 plays the far-end speech signal received, simultaneously, this far-end speech signal is resolved by frequency acquisition module 20, obtaining the frequency that occurrence number is maximum in far-end speech signal, the basic frequency being in far-end speech signal voice, for as the follow-up reference frequency carrying out echo cancellor.
Further, for the frequency that to be accurately obtained in far-end speech signal occurrence number maximum, with reference to shown in Fig. 4, frequency acquisition module 20 can include following refinement unit:
Signal filtering unit 21, for described far-end speech signal being carried out bandpass filtering treatment according to default cut-off frequency interval, obtains voice voice signal, and wherein, described default cut-off frequency interval is people's acoustic frequency scope;
Frequency statistic unit 22, for counting the frequency that in described voice voice signal, occurrence number is maximum.
In one embodiment, far-end speech signal can be carried out bandpass filtering treatment by band filter by signal filtering unit 21, to filter out in signal the noise except voice, obtain voice voice signal, in order to obtaining more accurate frequency point information, the default cut-off frequency interval of band filter can be voice frequency range, namely the audio frequency range that people can send, or general audio frequency range when people talks, for instance can be 50-5000Hz, or 500-5000Hz etc. After obtaining voice voice signal, count the frequency that in voice voice signal, occurrence number is maximum.
Further, the cut-off frequency that the sound that above-mentioned default cut-off frequency interval can be through remote subscriber is arranged after being analyzed in real time is interval.
Signal acquisition module 30, is used for gathering near-end sound and forms near-end voice signals;
Echo cancellation module 40, carries out echo cancellor for the frequency maximum according to the described occurrence number got to described near-end voice signals;
Signal transmitting module 50, for sending the described near-end voice signals after echo cancellor to described remote equipment.
Proximal device is while playing far-end speech signal, and its signal acquisition module 30 is also gathering near-end sound formation near-end voice signals, wherein, it is possible to can collect the sound played out in proximal device speaker.
Above-mentioned near-end voice signals is carried out echo cancellor by echo cancellation module 40, eliminate the signal that the maximum frequency of the above-mentioned occurrence number in near-end voice signals is corresponding, for example, it is possible to eliminate signal corresponding to the maximum frequency of occurrence number in far-end speech signal described in near-end voice signals to carry out echo cancellor by band filter. Or, according to the above-mentioned frequency got, far-end speech signal and echo cancellation algorithm, near-end voice signals is carried out echo cancellor.
Owing to proximal device is not all to collect the far-end speech signal that its speaker is play when voice call each time, therefore, further, the echo cancelling device of this voice communication also includes with lower module:
Judge module, plays, for judging whether to comprise in the near-end sound that described proximal device collects, the sound that described far-end speech signal produces;
Echo cancellation module 40, is additionally operable to, when comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, according to the frequency that the described occurrence number got is maximum, described near-end voice signals be carried out echo cancellor;
Signal transmitting module 50, is additionally operable to when not comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, and the described near-end voice signals that will collect sends to described remote equipment.
Before carrying out echo cancellor, judge module first judges the sound whether having the far-end speech signal of its broadcasting to produce in the sound that proximal device collects, such as, the spectrogram of the near-end voice signals collected Yu said distal ends voice signal is carried out contrast judge, if, then echo cancellation module 40 carries out echo cancellor, if it is not, then the near-end voice signals of collection is directly sent to remote equipment by signal transmitting module 50.
It is possible to further arrange echo cancellor pattern for equipment, when user opens this pattern, the near-end voice signals collected is carried out the process of echo cancellor, when being made without echo cancellor, close this pattern.
The echo cancelling device of the voice communication that the present embodiment proposes, proximal device is when receiving the far-end speech signal of remote equipment transmission, play this far-end speech signal, and obtain the frequency that in this far-end speech signal, occurrence number is maximum, while proximal device plays said distal ends voice signal, its mike gathers near-end sound and forms near-end voice signals, then according to the frequency that occurrence number is maximum, near-end voice signals is carried out echo cancellor, near-end voice signals after echo cancellor is sent to above-mentioned remote equipment, the sound of said distal ends voice signal is play owing to the near-end sound that collects being likely to include proximal device speaker, the present invention is through carrying out echo cancellation process to near-end voice signals, eliminate the proximal device speaker comprised in near-end voice signals and play the sound that far-end speech signal produces, to be again sent to remote equipment after avoiding collecting proximal device the far-end speech signal of broadcasting, echo is formed at remote equipment place, improve the voice quality in voice communication.
With reference to shown in Fig. 5, the second embodiment of the echo cancelling device of voice communication of the present invention is proposed based on the first embodiment of the echo cancelling device of voice communication of the present invention.In the present embodiment, described device and first embodiment are distinctive in that, the echo cancelling device of this voice communication also includes with lower module:
Whether signal judge module 60, be used for the signal intensity judging described far-end speech signal more than the first preset signal strength, and whether the signal intensity of described near-end voice signals be more than the second preset signal strength;
Echo cancellation module 40, it is additionally operable to the signal intensity working as described far-end speech signal more than described first preset signal strength, and the signal intensity of described near-end voice signals more than described second preset signal strength time, according to the frequency that the described occurrence number got is maximum, described near-end voice signals is carried out echo cancellor;
Signal transmitting module 50, it is additionally operable to the signal intensity working as described far-end speech signal less than or equal to described first preset signal strength, or when the signal intensity of described near-end voice signals is less than or equal to described second preset signal strength, the described near-end voice signals collected is sent to described remote equipment.
In one embodiment, signal judge module 60 can include with lower unit:
Signal processing unit, after described far-end speech signal is carried out windowing process, carries out Fourier transform and obtains the frequency domain power spectrum of described far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band;
Signal judging unit, for when there being the power spectrum of described sub-band of preset number more than predetermined threshold value, judge that the signal intensity of described far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of described far-end speech signal is less than described first preset signal strength.
Far-end speech signal is carried out windowing process by signal processing unit, such as Hanning window, then Fourier transform is carried out, this far-end speech signal is made to be transformed into frequency domain from time domain, thus obtaining the frequency domain power spectrum of this far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band, preferably, in the present embodiment, described frequency domain power spectrum is divided into 32 sub-bands, wherein, the number of sub-band can be arranged according to the demand of user, if being divided into 32 sub-bands, the power spectral value of each sub-band can represent with a bit, altogether need 32 bits, the frequency spectrum of this voice signal then can be represented by the data type of 32. the power spectrum of each sub-band is compared by signal judging unit with predetermined threshold value, wherein, predetermined threshold value and preset number all can by user setups, it is preferably 10-100db, when there being the power spectrum of sub-band of preset number more than predetermined threshold value, judge that the signal intensity of far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of far-end speech signal is less than the first preset signal strength.
Judgement about the signal intensity of near-end voice signals, it is possible to adopt the mode same with said process to judge, do not repeat them here.
The echo cancelling device of the voice communication that the present embodiment proposes, before carrying out echo cancellor, first the signal intensity of the near-end voice signals of far-end speech signal is judged, when the signal intensity of far-end speech signal and near-end voice signals is all relatively larger, near end signal is carried out echo cancellation process, if there being the signal intensity of a side more weak, then the impact that speech quality is produced by echo can be smaller, echo cancellor can not be carried out, to save resource.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the present invention and accompanying drawing content to make or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, all in like manner include in the scope of patent protection of the present invention.
Claims (10)
1. the echo cancel method of a voice communication, it is characterised in that the echo cancel method of described voice communication includes:
When proximal device receives the far-end speech signal of remote equipment transmission, play the described far-end speech signal received, and obtain the frequency that in described far-end speech signal, occurrence number is maximum;
Described proximal device gathers near-end sound and forms near-end voice signals;
According to the frequency that the described occurrence number got is maximum, described near-end voice signals is carried out echo cancellor, the described near-end voice signals after echo cancellor is sent to described remote equipment.
2. the echo cancel method of voice communication according to claim 1, it is characterised in that in the described far-end speech signal of described acquisition, the step of the frequency that occurrence number is maximum includes:
According to default cut-off frequency interval, described far-end speech signal being carried out bandpass filtering treatment, obtain voice voice signal, wherein, described default cut-off frequency interval is people's acoustic frequency scope;
Count the frequency that in described voice voice signal, occurrence number is maximum.
3. the echo cancel method of voice communication according to claim 1 and 2, it is characterized in that, before described near-end voice signals is carried out the step of echo cancellor by the frequency that described occurrence number that described basis gets is maximum, the echo cancel method of described voice communication further comprises the steps of:
Judge whether the near-end sound that described proximal device collects comprises and play the sound that described far-end speech signal produces;
When the near-end sound that described proximal device collects comprises the sound playing the generation of described far-end speech signal, perform according to the frequency that the described occurrence number got is maximum, described near-end voice signals to be carried out the step of echo cancellor;
When not comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, the described near-end voice signals that will collect sends to described remote equipment.
4. the echo cancel method of voice communication according to claim 1, it is characterized in that, before described near-end voice signals is carried out the step of echo cancellor by the frequency that described occurrence number that described basis gets is maximum, the echo cancel method of described voice communication further comprises the steps of:
Judge that whether the signal intensity of described far-end speech signal is more than the first preset signal strength, and whether the signal intensity of described near-end voice signals is more than the second preset signal strength;
When the signal intensity of described far-end speech signal is more than described first preset signal strength, and the signal intensity of described near-end voice signals more than described second preset signal strength time, perform the maximum frequency of described occurrence number that described basis gets and described near-end voice signals is carried out the step of echo cancellor, otherwise, the described near-end voice signals collected sends to described remote equipment.
5. the echo cancel method of voice communication according to claim 4, it is characterised in that whether the described signal intensity judging described far-end speech signal includes more than the step of the first preset signal strength:
After described far-end speech signal is carried out windowing process, carry out Fourier transform and obtain the frequency domain power spectrum of described far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band;
When there being the power spectrum of described sub-band of preset number more than predetermined threshold value, judge that the signal intensity of described far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of described far-end speech signal is less than described first preset signal strength.
6. the echo cancelling device of a voice communication, it is characterised in that the echo cancelling device of described voice communication includes:
Voice playing module, when being used for the far-end speech signal receiving remote equipment transmission, plays the described far-end speech signal received;
Frequency acquisition module, when being used for the far-end speech signal receiving remote equipment transmission, obtains the frequency that in described far-end speech signal, occurrence number is maximum;
Signal acquisition module, is used for gathering near-end sound and forms near-end voice signals;
Echo cancellation module, carries out echo cancellor for the frequency maximum according to the described occurrence number got to described near-end voice signals;
Signal transmitting module, for sending the described near-end voice signals after echo cancellor to described remote equipment.
7. the echo cancelling device of voice communication according to claim 6, it is characterised in that described frequency acquisition module includes:
Signal filtering unit, for described far-end speech signal being carried out bandpass filtering treatment according to default cut-off frequency interval, obtains voice voice signal, and wherein, described default cut-off frequency interval is people's acoustic frequency scope;
Frequency statistic unit, for counting the frequency that in described voice voice signal, occurrence number is maximum.
8. the echo cancelling device of the voice communication according to claim 6 or 7, it is characterised in that the echo cancelling device of described voice communication also includes:
Judge module, plays, for judging whether to comprise in the near-end sound that described proximal device collects, the sound that described far-end speech signal produces;
Described echo cancellation module, is additionally operable to, when comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, according to the frequency that the described occurrence number got is maximum, described near-end voice signals be carried out echo cancellor;
Described signal transmitting module, is additionally operable to when not comprising the sound playing the generation of described far-end speech signal in the near-end sound that described proximal device collects, and the described near-end voice signals that will collect sends to described remote equipment.
9. the echo cancelling device of voice communication according to claim 6, it is characterised in that the echo cancelling device of described voice communication also includes:
Whether signal judge module, be used for the signal intensity judging described far-end speech signal more than the first preset signal strength, and whether the signal intensity of described near-end voice signals be more than the second preset signal strength;
Described echo cancellation module, it is additionally operable to the signal intensity working as described far-end speech signal more than described first preset signal strength, and the signal intensity of described near-end voice signals more than described second preset signal strength time, according to the frequency that the described occurrence number got is maximum, described near-end voice signals is carried out echo cancellor;
Described signal transmitting module, it is additionally operable to the signal intensity working as described far-end speech signal less than or equal to described first preset signal strength, or when the signal intensity of described near-end voice signals is less than or equal to described second preset signal strength, the described near-end voice signals collected is sent to described remote equipment.
10. the echo cancelling device of voice communication according to claim 9, it is characterised in that described signal judge module includes:
Signal processing unit, after described far-end speech signal is carried out windowing process, carries out Fourier transform and obtains the frequency domain power spectrum of described far-end speech signal, and described frequency domain power spectrum is divided into multiple sub-band;
Signal judging unit, for when there being the power spectrum of described sub-band of preset number more than predetermined threshold value, judge that the signal intensity of described far-end speech signal is more than the first preset signal strength, otherwise, it is determined that the signal intensity of described far-end speech signal is less than described first preset signal strength.
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| CN201610109677.8A CN105657110B (en) | 2016-02-26 | 2016-02-26 | Echo cancellation method and device for voice communication |
| PCT/CN2016/084688 WO2017143690A1 (en) | 2016-02-26 | 2016-06-03 | Echo cancellation method and device for use in voice communication |
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| CN201610109677.8A CN105657110B (en) | 2016-02-26 | 2016-02-26 | Echo cancellation method and device for voice communication |
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| 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 |
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| CN113838473A (en) * | 2021-09-26 | 2021-12-24 | 科大讯飞股份有限公司 | Voice processing method and device of equipment and equipment |
| CN115579016A (en) * | 2022-12-07 | 2023-01-06 | 成都海普迪科技有限公司 | Method and system for eliminating acoustic echo |
| CN117238312A (en) * | 2023-08-28 | 2023-12-15 | 深蓝感知(杭州)物联科技有限公司 | Law enforcement recorder background sound amplification method and system |
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Also Published As
| Publication number | Publication date |
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| CN105657110B (en) | 2020-02-14 |
| WO2017143690A1 (en) | 2017-08-31 |
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