CN106534600A - Echo cancellation device, method and system - Google Patents
Echo cancellation device, method and system Download PDFInfo
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- CN106534600A CN106534600A CN201611059046.6A CN201611059046A CN106534600A CN 106534600 A CN106534600 A CN 106534600A CN 201611059046 A CN201611059046 A CN 201611059046A CN 106534600 A CN106534600 A CN 106534600A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
Abstract
The invention provides an echo cancellation device, method and system. The device comprises an input unit, a feedback unit, a processing unit and an output unit. The input unit is connected with an external microphone, and is used for receiving a first sound signal inputted by the microphone and sending the first sound signal to the processing unit. The feedback unit is connected with an external host, and is used for acquiring a second sound signal sent from the host to an external loudspeaker and sending the second sound signal to the processing unit. The processing unit is used for determining whether the second sound signal is included in the first sound signal. If the second sound signal is included in the first sound signal, the processing unit processes the first sound signal to cancel the second sound signal in the first sound signal, and sends the processed first sound signal to the output unit. The output unit is connected with the host, and is used for sending the processed first sound signal to the host. The host transmits the processed first sound signal to a sound receiving end. According to the invention, the call quality can be improved.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of echo cancelling device, method and system.
Background technology
With the continuous development and progress of computer technology, occur in that it is various set up on Fundamentals of Computer Technology from
Terminal device, various types of self-help terminal equipment is helped to be widely used in every field.Such as, it is applied to financial field
ATM, be applied to the registration machine of medical field, be applied to ticket taking machine of traffic and transport field etc..Set in some self-aided terminals
Call function is provided with standby, is exchanged so that user and the Batch Processing person of self-help terminal equipment carry out call, such as bank matches somebody with somebody
Standby remote bank self-help terminal equipment.
At present equipped with the self-help terminal equipment of call function, after microphone gathers the voice signal of user, directly
By the transmission of sound signals for collecting to backstage loudspeaker, and after the receipt platform send business personnel voice signal after,
Directly the sound of business personnel is played out by loudspeaker.
The self-help terminal equipment at present equipped with call function is directed to, the voice signal of user is not processed,
As acoustic echo can cause the sound that Batch Processing person hears to include echo, cause speech quality relatively low.
The content of the invention
Embodiments provide a kind of echo cancelling device, method and system, it is possible to increase speech quality.
A kind of echo cancelling device is embodiments provided, including：Input block, feedback unit, processing unit and
Output unit；
The input block is connected with the microphone of outside, for receiving the first voice signal of the microphone input,
And first voice signal is sent to into the processing unit；
The feedback unit is connected with the main frame of outside, for obtain that the main frame is sent to outside loudspeaker second
Voice signal, and the second sound signal is sent to into the processing unit；
The processing unit, for judging whether include the second sound signal in first voice signal, if
It is that first voice signal is processed, to eliminate the second sound signal in first voice signal, and will
First voice signal of process is simultaneously sent to the output unit；
The output unit is connected with the main frame, is sent to the master for first voice signal after by process
Machine, with by the main frame by process after first transmission of sound signals give sound receiving terminal.
Preferably,
The processing unit includes：Echo cancellor subelement；
The echo cancellor subelement, for the pulse strength according to first voice signal and the rising tone message
Number pulse strength, by one calculating of equation below process after first voice signal pulse strength；And according to process
First voice signal after the pulse strength determination process of first voice signal afterwards；
The formula one includes：
ω′1=ω1-ε·ω2
Wherein, the ω '1The pulse strength of first voice signal after for process, the ω1For first sound
The pulse strength of message number, the ω2For the pulse strength of the second sound signal, the ε is filter factor.
Preferably,
The processing unit is further included：Coefficient update subelement；
The coefficient update subelement, for the pulse strength according to the second sound signal, to the filter factor
It is updated, wherein the pulse strength of the size of the filter factor and the second sound signal is into positive correlation, and with
The distance between the loudspeaker and the microphone are into negative correlativing relation.
Preferably,
The processing unit includes：Judgment sub-unit；
The judgment sub-unit, for judging whether include in first voice signal and the second sound signal
Waveform variation tendency identical wavelet, if it is, judge that first voice signal includes the second sound signal, otherwise
The second sound signal is not included in judging first voice signal.
Preferably,
The echo cancelling device is further included：Adjustment unit；
The processing unit, is further used for determining the intensity of second sound signal described in first voice signal；
The adjustment unit, for the rising tone described in first voice signal determined according to the processing unit
The intensity of message number, is adjusted to the volume of the microphone and the loudspeaker.
The embodiment of the present invention additionally provides a kind of echo cancel method, including：
Receive the first voice signal of microphone input；
Obtain the second sound signal that main frame is sent to loudspeaker；
Whether the second sound signal is included in judging first voice signal；
If it is, first voice signal is processed, to eliminate described second in first voice signal
Voice signal；
First voice signal after by process send to the main frame, with by the main frame by process after described in
First voice signal is sent to sound receiving terminal.
Preferably,
It is described that first voice signal is processed, including：
According to the pulse strength of the pulse strength and the second sound signal of first voice signal, by following public
The pulse strength of first voice signal after one calculating of formula process；
First voice signal after the pulse strength determination process of first voice signal after according to process；
The formula one includes：
ω′1=ω1-ε·ω2
Wherein, the ω '1The pulse strength of first voice signal after for process, the ω1For first sound
The pulse strength of message number, the ω2For the pulse strength of the second sound signal, the ε is filter factor.
Preferably,
It is described first voice signal is processed before, further include：
According to the pulse strength of the second sound signal, the filter factor is updated, wherein the filtering system
The pulse strength of several sizes and the second sound signal into positive correlation, and with the loudspeaker and the microphone it
Between distance into negative correlativing relation.
Preferably,
It is described to judge whether include the second sound signal in first voice signal, including：
Whether waveform variation tendency identical with the second sound signal is included in judging first voice signal
Wavelet, if it is, judging that first voice signal includes the second sound signal, otherwise judges the first sound letter
The second sound signal is not included in number.
The embodiment of the present invention additionally provides a kind of echo cancelling system, including：Sound receiving terminal, main frame, loudspeaker, Mike
Any one described echo cancelling device that wind and above-described embodiment are provided；
The sound receiving terminal, for sending the second sound signal to the main frame, and receives the main frame
First voice signal after the process sent；
The main frame, for the second sound signal that the sound receiving terminal sends is sent to the loudspeaker,
And first voice signal after the process for sending the echo cancelling device is sent to the sound receiving terminal；
The loudspeaker, for playing out to the second sound signal that the main frame sends；
First voice signal for gathering first voice signal, and is sent to described returning by the microphone
Sound cancellation element.
Echo cancelling device provided in an embodiment of the present invention, method and system, input block receive the of microphone input
One voice signal, feedback unit obtain the second sound signal that main frame is sent to loudspeaker, when processing unit judges the first sound
After signal includes second sound signal, the first voice signal is processed by processing unit, eliminated in the first voice signal
Including second sound signal, and by process after the first voice signal be sent to output unit, output unit will by main frame
The first voice signal after process is sent to sound receiving terminal.By processing to the first voice signal, first can be eliminated
The second sound signal introduced as microphone collects the played sound of loudspeaker in voice signal, it is ensured that be sent to sound
There is no the echo of second sound signal in first voice signal of receiving terminal, such that it is able to improve speech quality.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of schematic diagram of echo cancelling device that one embodiment of the invention is provided；
Fig. 2 is a kind of schematic diagram of processing unit that one embodiment of the invention is provided；
Fig. 3 is a kind of schematic diagram of echo cancelling device that another embodiment of the present invention is provided；
Fig. 4 is a kind of flow chart of echo cancel method that one embodiment of the invention is provided；
Fig. 5 is a kind of schematic diagram of echo cancelling system that one embodiment of the invention is provided；
Fig. 6 is a kind of flow chart of echo cancel method that another embodiment of the present invention is provided.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than the embodiment of whole, based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
As shown in figure 1, a kind of echo cancelling device is embodiments provided, including：Input block 101, feedback
Unit 102, processing unit 103 and output unit 104；
The input block 101 is connected with the microphone of outside, and the first sound for receiving the microphone input is believed
Number, and first voice signal is sent to into the processing unit 103；
The feedback unit 102 is connected with the main frame of outside, is sent to outside loudspeaker for obtaining the main frame
Second sound signal, and the second sound signal is sent to into the processing unit 103；
The processing unit 103, for judging whether include the second sound signal in first voice signal, such as
Fruit is that first voice signal is processed, to eliminate the second sound signal in first voice signal, and
By process first voice signal and be sent to the output unit 104；
The output unit 104 is connected with the main frame, is sent to institute for first voice signal after by process
State main frame, with by the main frame by process after first transmission of sound signals give sound receiving terminal.
A kind of echo cancelling device is embodiments provided, input block receives the first sound letter of microphone input
Number, feedback unit obtains the second sound signal that main frame is sent to loudspeaker, wraps in processing unit judges the first voice signal
After including second sound signal, the first voice signal is processed by processing unit, eliminate that the first voice signal includes the
Two voice signals, and by process after the first voice signal be sent to output unit, output unit is after main frame is by process
First voice signal is sent to sound receiving terminal.By processing to the first voice signal, the first voice signal can be eliminated
In the second sound signal that introduces as microphone collects the played sound of loudspeaker, it is ensured that be sent to sound receiving terminal
There is no the echo of second sound signal in first voice signal, such that it is able to improve speech quality.
In an embodiment of the invention, processing unit includes echo cancellor subelement, and echo cancellor subelement is used for
According to the pulse strength of the pulse strength and second sound signal of the first voice signal, after one calculating of equation below is processed
The pulse strength of the first voice signal, and according to process after the first voice signal pulse strength determination process after the first sound
Message number；
Wherein, first formula includes：
ω′1=ω1-ε·ω2
Wherein, the ω '1The pulse strength of first voice signal after for process, the ω1For first sound
The pulse strength of message number, the ω2For the pulse strength of the second sound signal, the ε is filter factor.
Specifically,
When loudspeaker is played out to the second sound signal that main frame sends, microphone may simultaneously collection user's
Sound, includes with sound (sound of user) and interference noise, in order to disappear in the first voice signal that now microphone is formed
Except the echo of sound receiving terminal, the second sound signal of interference noise predominantly loudspeaker broadcasting herein.
It is superimposed with interference noise as the first voice signal that microphone is collected is useful sound, therefore the first sound
The pulse strength of signal is equal to the pulse strength after useful sound is superimposed with interference noise, from the pulse strength of the first voice signal
In deduct interference noise pulse strength just can reach eliminate sound receiving terminal echo problem.Due to loudspeaker play the
Two voice signals have certain loss when reaching microphone, by the pulse strength of filter factor and second sound signal come really
Determine the pulse strength of interference noise.
As shown in above-mentioned formula one, ω '1To the pulse strength for characterizing useful sound in the first voice signal, such as wheat
The pulse strength of user's voice that gram wind is collected；ω1To the pulse strength for characterizing the first voice signal, it is useful sound
Pulse strength after being superimposed with interference noise；ε·ω2To the pulse strength for characterizing interference noise in the first voice signal, ε's
Size has reacted damaed cordition when the played sound of loudspeaker reaches microphone.
In an embodiment of the invention, as shown in Fig. 2 processing unit 103 is except including echo cancellor subelement
Outside 1031, renewal subelement 1032 is also included；
Subelement 1032 is updated for the pulse strength according to the first voice signal, filter factor is updated, wherein
The size of filter factor and the pulse strength of second sound signal into positive correlation, and between loudspeaker and microphone away from
From into negative correlativing relation.
Specifically,
Due to loudspeaker it is different from the distance between microphone when, the sound sent by loudspeaker reaches damage during microphone
Mistake is different, and loudspeaker is bigger with the distance between microphone to lose bigger, the pulse of interference noise in the first voice signal
Intensity is less, and correspondingly filter factor is less；The distance between loudspeaker and microphone more small loss is less, the first voice signal
The pulse strength of middle interference noise is bigger, and correspondingly filter factor is bigger.
After distance between loudspeaker and microphone determines, it may be determined that go out a standard value of filter factor, not
The premise system filter factor of consideration other factors is a definite value.But, filter factor is except by between loudspeaker and microphone
Outside the impact of distance, also affected by second sound signal pulse strength, the pulse strength of second sound signal is bigger, the first sound
In message number, the pulse strength of noise jamming is bigger.Therefore, when the distance between loudspeaker and microphone determines, update son single
Unit carries out real-time update to filter factor according to the intensity of second sound signal, is included with eliminating the first voice signal exactly
Second sound signal, it is ensured that it is not in echoing that sound receiving terminal play the first voice signal to be, further improves logical
Words quality.
In an embodiment of the invention, include in processing unit and perform the judgment sub-unit for judging processing procedure, sentence
Whether disconnected subelement includes the waveform variation tendency identical wavelet with second sound signal in being used to judge the first voice signal,
If it is, judging that the first voice signal includes second sound signal, in otherwise judging the first voice signal, the rising tone is not included
Message number.
Specifically,
When loudspeaker plays sound, the first voice signal that microphone is collected is by the useful sound (sound that user sends
Sound) it is formed by stacking with interference noise (second sound signal that loudspeaker is played), thus the waveform change of the first voice signal becomes
Gesture can be affected by second sound signal, can be included identical with second sound signal waveform variation tendency in the first voice signal
Wavelet.Therefore, by judging whether include the waveform variation tendency identical with second sound signal in the first voice signal
Whether wavelet, include second sound signal in can judging the first voice signal exactly, it is ensured that the echo cancelling device pair
The reliability eliminated by echo.
In an embodiment of the invention, as shown in figure 3, the echo cancelling device can also include adjustment unit 305；
Processing unit 103 is further used for the intensity for determining second sound signal in the first voice signal；
Adjustment unit 305 in the first voice signal for being determined according to processing unit 103 second sound signal it is strong
Degree, is adjusted to the volume of microphone and loudspeaker.
Specifically,
The volume of loudspeaker and microphone be cause the first voice signal include one of second sound signal it is important because
Element, the volume more high pass of loudspeaker are higher to the intensity of the second sound signal of microphone, and the volume of microphone gets over Gao Zecai
The intensity of the second sound signal for collecting is also higher.Therefore, second sound signal in the first voice signal of processing unit elimination
Meanwhile, the intensity of second sound signal in the first voice signal that adjustment unit can be determined according to processing unit, to raising one's voice
The volume of device and microphone is adjusted, and included second sound signal in the first voice signal is reduced from root, it is ensured that
Sound receiving terminal play the first voice signal be not in echo phenomenon, further improve speech quality.
As shown in figure 4, a kind of echo cancel method is provided in one embodiment of the invention, the method can include following
Step：
Step 401：Receive the first voice signal of microphone input；
Step 402：Obtain the second sound signal that main frame is sent to loudspeaker；
Step 403：Whether the second sound signal is included in judging first voice signal, if it is, performing step
Rapid 404, otherwise terminate current process；
Step 404：First voice signal is processed, to eliminate described second in first voice signal
Voice signal；
Step 405：First voice signal after by process send to the main frame, will be processed by the main frame
First voice signal afterwards is sent to sound receiving terminal.
In an embodiment of the invention, the process for being processed to the first voice signal in step 404 can include：
According to the pulse strength of the pulse strength and the second sound signal of first voice signal, by following public
The pulse strength of first voice signal after one calculating of formula process；
First voice signal after the pulse strength determination process of first voice signal after according to process；
The formula one includes：
ω′1=ω1-ε·ω2
Wherein, the ω '1The pulse strength of first voice signal after for process, the ω1For first sound
The pulse strength of message number, the ω2For the pulse strength of the second sound signal, the ε is filter factor.
In an embodiment of the invention, the renewal process of filter factor, the process can also be included before step 404
Including：
According to the pulse strength of the second sound signal, the filter factor is updated, wherein the filtering system
The pulse strength of several sizes and the second sound signal into positive correlation, and with the loudspeaker and the microphone it
Between distance into negative correlativing relation.
In an embodiment of the invention, whether include second sound signal during the first voice signal is judged in step 403
Process can include：
Whether waveform variation tendency identical with the second sound signal is included in judging first voice signal
Wavelet, if it is, judging that first voice signal includes the second sound signal, otherwise judges the first sound letter
The second sound signal is not included in number.
As shown in figure 5, a kind of echo cancelling system is embodiments provided, including：Sound receiving terminal 501, main frame
502nd, loudspeaker 503, microphone 504 and any one echo cancelling device 505 provided in an embodiment of the present invention；
The sound receiving terminal 501, for sending the second sound signal to the main frame 502, and receives described
First voice signal after the process that main frame 502 sends；
The main frame 502, for the second sound signal that the sound receiving terminal 501 sends is sent to described raising
First voice signal after sound device 503, and the process that the echo cancelling device 505 is sent is sent to the sound
Receiving terminal 501；
The loudspeaker 503, for playing out to the second sound signal that the main frame 502 sends；
The microphone 504, for gathering first voice signal, and first voice signal is sent to described
Echo cancelling device 505.
Below by taking remote bank self-help terminal equipment as an example, returning shown in the echo cancelling device and Fig. 5 with reference to shown in Fig. 3
Sound eliminates system, and echo cancel method provided in an embodiment of the present invention is described further, as shown in fig. 6, the method can be with
Comprise the following steps：
Step 601：First voice signal is gathered by microphone.
In an embodiment of the invention, as shown in Figure 3 and Figure 5, microphone 504 is believed in specific station acquisition sound
Breath, forms the first voice signal, and the first voice signal for collecting is sent to the input block in echo cancelling device 506
101.After input block 101 receives the first voice signal of the input of microphone 504, the first voice signal is sent to into echo and is disappeared
Except the processing unit 103 in device 506.
For example, user is conversed with Batch Processing person by remote bank self-help terminal equipment, now Batch Processing person
Correspondence sound receiving terminal 501, the processor and appurtenances respective hosts 502 of remote bank self-help terminal equipment, remote bank
The loudspeaker correspondence loudspeaker 503 of self-help terminal equipment, the microphone correspondence microphone 504 of remote bank self-help terminal equipment.
The microphone of remote bank self-help terminal equipment gathers the voice of user, forms the first voice signal, and the first sound is believed
First voice signal is sent to echo and is disappeared by the input block 101 number being sent in echo cancelling device 506, input block 101
Except the processing unit 103 in device 506.
Step 602：Obtain the second sound signal that main frame is sent to loudspeaker.
In an embodiment of the invention, as shown in Figure 3 and Figure 5, the feedback unit 102 in echo cancelling device 505 is obtained
The second sound signal that main frame 502 is sent to loudspeaker 503 is taken, and the second sound signal for getting is sent to into processing unit
103。
For example, during Batch Processing person and user are conversed, carry Batch Processing person and speak the rising tone of content
Message Jing main frame 502 is sent to loudspeaker 503 and plays out, and allows user to hear the dialog context of Batch Processing person.Instead
Feedback unit 102 obtains the second sound signal that main frame 502 is sent to loudspeaker 503 in real time, after second sound signal is got,
The second sound signal for getting is sent to into processing unit 103.
Step 603：Whether second sound signal is included in judging the first voice signal, if it is, execution step 604, no
Then execution step 607.
In an embodiment of the invention, as shown in figure 3, whether processing unit 103 includes in judging the first voice signal
With the waveform variation tendency identical wavelet of second sound signal, if it is, judge the first voice signal include second sound
Signal, execution step 604 correspondingly do not include second sound signal in otherwise judging the first voice signal, correspondingly perform
Step 607.Wherein, if feedback unit 102 does not get second sound signal, above-mentioned judged result is no.
For example, if gathering the speak when loudspeaker 503 of content of user in microphone 504 is playing rising tone message
Number, the waveform variation tendency identical wavelet with second sound signal is included in the first voice signal of the collection of microphone 504,
Now processing unit 103 includes second sound signal in judging the first voice signal, correspondingly execution step 604.If
The speak when loudspeaker 503 of content of user is gathered in microphone 504 and does not play sound, or the sound that loudspeaker 503 is played
Do not collected by microphone 504, in the first voice signal of the collection of microphone 504, do not include the waveform with second sound signal
Variation tendency identical wavelet, now processing unit 103 can judge not include second sound signal in the first voice signal, accordingly
Ground execution step 607.
Step 604：According to the pulse strength of second sound signal, filter factor is determined.
In an embodiment of the invention, as shown in Figure 3 and Figure 5, in processing unit 103 judges the first voice signal
During including second sound signal, processing unit 103 determines the pulse strength of second sound signal, and strong according to the pulse determined
Degree carries out real-time adjustment to filter factor, and the wherein size of filter factor is closed into positive correlation with the pulse strength of second sound signal
System.
For example, according to the distance between remote bank self-help terminal equipment upper speaker and microphone, and remote bank
Environment residing for self-help terminal equipment, the standard value for presetting filter factor are 0.5；When processing unit 103 determines rising tone message
Number pulse strength it is larger when, filter factor is adjusted to into 0.6, when processing unit 103 determines the pulse of second sound signal
When intensity is less, filter factor is adjusted to into 0.4.
Step 605：First voice signal is processed, the second sound signal that includes is eliminated, the after being processed
One voice signal.
In an embodiment of the invention, as shown in figure 3, processing unit 103 is according to the first voice signal and second sound
The filter factor determined in the pulse strength of signal and step 604, at a pair first voice signals of equation below
Reason, the first voice signal to eliminate the second sound signal that the first voice signal includes, after being processed；
First formula is：
ω′1=ω1-ε·ω2
Wherein, the ω '1The pulse strength of first voice signal after for process, the ω1For first sound
The pulse strength of message number, the ω2For the pulse strength of the second sound signal, the ε is filter factor.
For example, the first voice signal includes the voice of user, the sound of the broadcasting of loudspeaker 503 and other sound, obtains
After the pulse strength of the first voice signal and second sound signal, calculated by above-mentioned formula one and eliminated the after second sound signal
The pulse strength of one voice signal, and then the first voice signal after being processed.
Step 606：The first voice signal after by process is sent to sound receiving terminal, by sound receiving terminal to process after
First voice signal is played out, and terminates current process.
In an embodiment of the invention, as shown in Figure 3 and Figure 5,103 pairs of the first voice signals of processing unit are processed
After the first voice signal after being processed, by process after the first voice signal be sent to output unit 104, output unit
The first voice signal after the process for receiving is sent to main frame 502 by 104, and main frame 502 is by first after the process for receiving
Voice signal is sent to sound receiving terminal 501, and the first voice signal after being processed by 501 pairs is played out.
For example, after the first voice signal after echo cancelling device 505 is processed, by process after the first voice signal
Be sent to remote bank self-help terminal equipment, by remote bank self-help terminal equipment by process after the first voice signal be sent to
The audio playing device that Batch Processing person goes out, by the audio playing device to process after the first voice signal play out, this
When Batch Processing person will not hear the echo of content before oneself.
Step 607：First voice signal is sent to into sound receiving terminal, the first voice signal is carried out by sound receiving terminal
Play.
In an embodiment of the invention, as shown in Figure 3 and Figure 5, in processing unit 103 judges the first voice signal not
After second sound signal, the first voice signal is directly sent to output unit 104, output unit 104 by processing unit 103
First voice signal is sent to into main frame 502, the first voice signal is sent to sound receiving terminal 501 by main frame 502, and sound is received
501 pairs of the first voice signals in end are played out.
Echo cancelling device provided in an embodiment of the present invention, method and system, at least have the advantages that：
1st, in echo cancelling device provided in an embodiment of the present invention, method and system, it is defeated that input block receives microphone
The first voice signal for entering, feedback unit obtain main frame and are sent to the second sound signal of loudspeaker, when processing unit judges the
After one voice signal includes second sound signal, the first voice signal is processed by processing unit, eliminate the first sound
The second sound signal that signal includes, and by process after the first voice signal be sent to output unit, output unit passes through
Main frame by process after the first voice signal be sent to sound receiving terminal.By processing to the first voice signal, can disappear
Except the second sound signal introduced as microphone collects the played sound of loudspeaker in the first voice signal, it is ensured that send
To the echo for not having second sound signal in the first voice signal of sound receiving terminal, such that it is able to improve speech quality.
2nd, in echo cancelling device provided in an embodiment of the present invention, method and system, disappearing from the first voice signal
During except second sound signal, filter factor can be updated according to the pulse strength of second sound signal, due to
When the pulse strength of second sound signal is big, the pulse strength of the second sound signal that the first voice signal includes is also than larger,
By adjusting filter factor, the second sound signal that the first voice signal includes can be more thoroughly eliminated, it is ensured that sound
Receiving terminal is not in echoing, further increases the quality of call.
3rd, in echo cancelling device provided in an embodiment of the present invention, method and system, by judging the first voice signal
In whether include with second sound signal waveform variation tendency identical wavelet, whether include in determining the first voice signal
Second sound signal, when including second sound signal due to the first voice signal, the waveform of the first voice signal can be with second
Include in the addition of waveforms of voice signal, therefore the first voice signal and second sound signal waveform variation tendency identical
Ripple.By this judgment mode, during the first voice signal can be judged exactly, whether second sound signal is included, it is ensured that
The reliability of the echo cancelling device and method.
4th, in echo cancelling device provided in an embodiment of the present invention, method and system, except by processing unit to the
One voice signal is processed, and is eliminated outside echo in the way of eliminating second sound signal, can also be adjusted by adjustment unit
The volume of whole loudspeaker and microphone, so that the second sound signal that the first voice signal includes is reduced from root, it is ensured that sound
Sound receiving terminal play the first voice signal be not in echo phenomenon, further improve speech quality.
It should be noted that herein, such as first and second etc relational terms are used merely to an entity
Or operation is made a distinction with another entity or operation, and not necessarily require or imply presence between these entities or operation
Any this actual relation or order.And, term " including ", "comprising" or its any other variant are intended to non-
Exclusiveness is included, so that a series of process, method, article or equipment including key elements not only includes those key elements,
But also including other key elements being not expressly set out, or also include solid by this process, method, article or equipment
Some key elements.In the absence of more restrictions, the key element for being limited by sentence " including ", does not arrange
Except also there is other identical factor in including the process of the key element, method, article or equipment.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of said method embodiment can pass through
Completing, aforesaid program can be stored in the storage medium of embodied on computer readable the related hardware of programmed instruction, the program
Upon execution, perform the step of including said method embodiment；And aforesaid storage medium includes：ROM, RAM, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
It is last it should be noted that：Presently preferred embodiments of the present invention is the foregoing is only, the skill of the present invention is merely to illustrate
Art scheme, is not intended to limit protection scope of the present invention.All any modifications made within the spirit and principles in the present invention,
Equivalent, improvement etc., are all contained in protection scope of the present invention.
Claims (10)
1. a kind of echo cancelling device, it is characterised in that include：Input block, feedback unit, processing unit and output unit；
The input block is connected with the microphone of outside, for receiving the first voice signal of the microphone input, and will
First voice signal is sent to the processing unit；
The feedback unit is connected with the main frame of outside, for obtaining the second sound that the main frame is sent to the loudspeaker of outside
Signal, and the second sound signal is sent to into the processing unit；
The processing unit, for judging whether include the second sound signal in first voice signal, if it is, right
First voice signal is processed, and to eliminate the second sound signal in first voice signal, and will be processed
First voice signal and be sent to the output unit；
The output unit is connected with the main frame, is sent to the main frame for first voice signal after by process,
With by the main frame by process after first transmission of sound signals give sound receiving terminal.
2. device according to claim 1, it is characterised in that
The processing unit includes：Echo cancellor subelement；
The echo cancellor subelement, for the pulse strength and the second sound signal according to first voice signal
Pulse strength, the pulse strength of first voice signal after one calculating of equation below is processed；And according to process after
First voice signal after the pulse strength determination process of first voice signal；
The formula one includes：
ω′1=ω1-ε·ω2
Wherein, the ω '1The pulse strength of first voice signal after for process, the ω1Believe for first sound
Number pulse strength, the ω2For the pulse strength of the second sound signal, the ε is filter factor.
3. device according to claim 2, it is characterised in that
The processing unit is further included：Coefficient update subelement；
The coefficient update subelement, for the pulse strength according to the second sound signal, is carried out to the filter factor
Update, wherein the pulse strength of the size of the filter factor and the second sound signal is into positive correlation, and with it is described
The distance between loudspeaker and the microphone are into negative correlativing relation.
4. device according to claim 1, it is characterised in that
The processing unit includes：Judgment sub-unit；
The judgment sub-unit, for judging whether include the waveform with the second sound signal in first voice signal
Variation tendency identical wavelet, if it is, judging that first voice signal includes the second sound signal, otherwise judges
The second sound signal is not included in first voice signal.
5. according to arbitrary described device in Claims 1-4, it is characterised in that further include：Adjustment unit；
The processing unit, is further used for determining the intensity of second sound signal described in first voice signal；
The adjustment unit, for rising tone message described in first voice signal determined according to the processing unit
Number intensity, the volume of the microphone and the loudspeaker is adjusted.
6. a kind of echo cancel method, it is characterised in that include：
Receive the first voice signal of microphone input；
Obtain the second sound signal that main frame is sent to loudspeaker；
Whether the second sound signal is included in judging first voice signal；
If it is, first voice signal is processed, to eliminate the second sound in first voice signal
Signal；
First voice signal after by process send to the main frame, with by the main frame by process after described first
Voice signal is sent to sound receiving terminal.
7. method according to claim 6, it is characterised in that
It is described that first voice signal is processed, including：
According to the pulse strength of the pulse strength and the second sound signal of first voice signal, by equation below one
The pulse strength of first voice signal after calculating process；
First voice signal after the pulse strength determination process of first voice signal after according to process；
The formula one includes：
ω′1=ω1-ε·ω2
Wherein, the ω '1The pulse strength of first voice signal after for process, the ω1Believe for first sound
Number pulse strength, the ω2For the pulse strength of the second sound signal, the ε is filter factor.
8. method according to claim 7, it is characterised in that
It is described first voice signal is processed before, further include：
According to the pulse strength of the second sound signal, the filter factor is updated, wherein the filter factor
The pulse strength of size and the second sound signal into positive correlation, and between the loudspeaker and the microphone
Distance is into negative correlativing relation.
9. method as requested described in 6, it is characterised in that
It is described to judge whether include the second sound signal in first voice signal, including：
Whether waveform variation tendency identical wavelet with the second sound signal is included in judging first voice signal,
If it is, judge that first voice signal includes the second sound signal, in otherwise judging first voice signal
The second sound signal is not included.
10. a kind of echo cancelling system, it is characterised in that include：Sound receiving terminal, main frame, loudspeaker, microphone and right will
Seek arbitrary described echo cancelling device in 1 to 5；
The sound receiving terminal, for sending the second sound signal to the main frame, and receives what the main frame sent
First voice signal after process；
The main frame, for the second sound signal that the sound receiving terminal sends is sent to the loudspeaker, and
First voice signal after the process that the echo cancelling device is sent is sent to the sound receiving terminal；
The loudspeaker, for playing out to the second sound signal that the main frame sends；
First voice signal for gathering first voice signal, and is sent to the echo and is disappeared by the microphone
Except device.
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| CN201611059046.6A CN106534600A (en) | 2016-11-24 | 2016-11-24 | Echo cancellation device, method and system |
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| CN201611059046.6A CN106534600A (en) | 2016-11-24 | 2016-11-24 | Echo cancellation device, method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109087661A (en) * | 2018-10-23 | 2018-12-25 | 南昌努比亚技术有限公司 | Method of speech processing, device, system and readable storage medium storing program for executing |
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| CN105915738A (en) * | 2016-05-30 | 2016-08-31 | 宇龙计算机通信科技(深圳)有限公司 | Echo cancellation method, echo cancellation device and terminal |
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| CN1157522A (en) * | 1995-03-09 | 1997-08-20 | 索尼公司 | Echo Removing apparatus |
| CN102164210A (en) * | 2010-01-08 | 2011-08-24 | 科尼桑特系统股份有限公司 | Systems and methods for echo cancellation and echo suppression |
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| CN109087661A (en) * | 2018-10-23 | 2018-12-25 | 南昌努比亚技术有限公司 | Method of speech processing, device, system and readable storage medium storing program for executing |
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