CN109040501A - A kind of echo cancel method improving VOIP phone quality - Google Patents
A kind of echo cancel method improving VOIP phone quality Download PDFInfo
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- CN109040501A CN109040501A CN201811051934.2A CN201811051934A CN109040501A CN 109040501 A CN109040501 A CN 109040501A CN 201811051934 A CN201811051934 A CN 201811051934A CN 109040501 A CN109040501 A CN 109040501A
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- audio signal
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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
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
Abstract
The invention discloses a kind of echo cancel methods for improving VOIP phone quality, including obtain basic time delay value Δ t0；According to basic time delay value Δ t since voice communication0Quickly eliminate talk echo；The real-time time delay value Δ t of dynamic acquisition in communication processn, and the step of dynamic eliminates talk echo.Before call does not start, echo cancellation process device exports auxiliary sampling audio signal f0, obtain the basic time delay value Δ t under hardware environment locating for equipment and external environment0, the basic time delay value Δ t of echo cancellation process device record0And according to basic time delay value Δ t0Quickly eliminate talk echo；In communication process, in next sampling instant tn+1Before arrival, echo cancellation process device calls the other side stored in buffer area to transmit the audio signal f of comingnAnd the audio signal f that microphone receivesn', according to current real-time time delay value Δ tnQuickly from audio signal fn' in eliminate audio signal fn, and control audio output module output and eliminate the audio signal after echo, realize that dynamic eliminates echo.
Description
Technical field
The present invention relates to echo cancellation technology fields, more particularly to a kind of echo cancellor side for improving VOIP phone quality
Method.
Background technique
The basic principle of VoIP is to carry out compression processing to encoded speech data by the compression algorithm of voice, then this
A little voice data are packaged by TCP/IP standard, and data packet is sent to receiving, then these voices by IP network
Data packet strings together, and original voice signal is reverted to after decompression processing, to reach by the mesh of Internet transmission voice
's.
It in two-way intercommunication, often will appear in the sound heard the phenomenon that being mingled with self sound, in the prior art, deposit
This is solved the problems, such as in echo cancellation technology, but in the previous short time formally conversed, still be will appear the problem, led
Cause speech quality bad.
Existing echo cancellor mode be found within a bit of time after voice starts the audio section that need to eliminate again into
Row is eliminated, but echo is still had in this time, and since equipment can move to different external environment with people, works as external environment
When variation, real-time time delay value can accordingly change, and dynamic does not eliminate echo in time, so that user cannot preferably converse
Experience.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of echo cancellors for improving VOIP phone quality
Method.
The purpose of the present invention is achieved through the following technical solutions: a kind of echo cancellor improving VOIP phone quality
Method, comprising the following steps:
S1: basic time delay value Δ t is obtained0: before starting voice communication, acquisition is made of hardware time delay and basic environment time delay
Basic time delay value Δ t0, specifically includes the following steps:
S101: echo cancellation process device exports auxiliary sampling audio signal f0To audio receiving module, record exports the auxiliary
Sampled audio signal f0At the time of, it is denoted as t1；
During this, microphone receives external sound wave always, is converted to audio signal f0', and synchronize be sent in buffer area into
Row storage；
S102: the audio receiving module receives the auxiliary sampling audio signal f0After be sent to loudspeaker, and send simultaneously
Auxiliary sampling audio signal f0It is stored to buffer area；
S103: loudspeaker receives the auxiliary sampling audio signal f0After play out, Acoustic Wave Propagation to microphone, microphone
Receive the sound wave；
S104: echo cancellation process device calls the auxiliary sampling audio signal f stored in buffer area0And audio signal f0' go forward side by side
Row compares, and finds audio signal f0' in occur with auxiliary sampling audio signal f0The initial time of identical audio section, is denoted as t2,
Then basic time delay value Δ t0= t2-t1；
S2: non-delay fast echo is eliminated, according to basic time delay value Δ t since voice communication0It quickly eliminates and converses back
Sound, specifically includes the following steps:
S201: audio receiving module receives the audio signal f that partner transmission comes1；
S202: audio receiving module receives the audio signal f1After be sent to loudspeaker, and send audio signal f simultaneously1
It is stored to buffer area；
During this, microphone receives external sound wave always, is converted to audio signal f1', and synchronize be sent in buffer area into
Row storage；
S203: loudspeaker receives the audio signal f1After play out, Acoustic Wave Propagation to microphone, microphone receives this
Sound wave；
S204: echo cancellation process device calls the audio signal f stored in buffer area1And audio signal f1', according to basic time delay
It is worth Δ t0Quickly from audio signal f1' in eliminate audio signal f1, and control audio output module output and eliminate the audio after echo
Signal.
A kind of echo cancel method of the improvement VOIP phone quality, further include in communication process dynamic acquisition it is real-time
Time delay value Δ tn, and the step of dynamic eliminates talk echo, specifically includes the following steps:
SS1: real-time time delay value Δ t is obtainedn: in communication process, obtains be made of hardware time delay and real time environment time delay in real time
Real-time time delay value Δ tn, specifically includes the following steps:
SS101: audio receiving module receives the audio signal f that other side's transmission comesn, record it and receive audio signal fnWhen
Carve tn；
SS102: audio receiving module receives the audio signal fnAfter be sent to loudspeaker, and send audio signal f simultaneouslyn
And time data tnIt is stored to buffer area；
During this, microphone receives external sound wave always, is converted to audio signal fn', and synchronize be sent in buffer area into
Row storage；
SS103: loudspeaker receives the audio signal fnAfter play out, Acoustic Wave Propagation to microphone, microphone receives
The sound wave；
SS104: echo cancellation process device calls the audio signal f stored in buffer arean' and other side transmission come audio letter
Number fnAnd be compared, find audio signal fn' in occur with the audio signal fnThe initial time of identical audio section, note
For tn', then real-time time delay value Δ tn=tn’-tn；
SS2: non-delay fast echo is eliminated, according to real-time time delay value Δ t in communication processnQuickly eliminate talk echo: under
One sampling instant tn+1Before arrival, echo cancellation process device calls the other side stored in buffer area to transmit the audio signal of coming
fnAnd the audio signal f that microphone receivesn', according to current real-time time delay value Δ tnQuickly from audio signal fn' in eliminate
Audio signal fn, and control audio output module output and eliminate the audio signal after echo；
Next sampling instant tn+1When arrival, circulation step SS101 ~ SS104 obtains sampling instant tn+1Real-time time delay value Δ
tn+1, in next but one sampling instant tn+2Before arrival, according to sampling instant tn+1Real-time time delay value Δ tn+1Quickly from audio
Signal fn+1' in eliminate audio signal fn+1, and control audio output module output and eliminate the audio signal after echo；
And so on, the real-time time delay value of dynamic acquisition in communication process is completed, and dynamic eliminates talk echo.
The auxiliary sampling audio signal f0For single track audio.
The beneficial effects of the present invention are:
1) before call does not start, the voice signal of no both call sides exports auxiliary sampling audio by echo cancellation process device
Signal f0As benchmark interference signal, the base under external environment locating for the hardware environment and equipment that equipment can be provided is obtained
Plinth time delay value Δ t0, echo cancellation process device records basis time delay value Δ t0, correspondence can be accordingly wiped out when starting call
In basic time delay value Δ t0With audio signal f1Identical audio section (interference signal), so that can when just starting call
The echo for eliminating first voice that other side issues, is transmitted to other side by audio output module for noise-free one's own side's sound and connects
In receiving unit.
2) in communication process, in next sampling instant tn+1Before arrival, echo cancellation process device is called in buffer area
The audio signal f that other side's transmission of storage comesnAnd the audio signal f that microphone receivesn', according to current real-time time delay value Δ
tnQuickly from audio signal fn' in eliminate audio signal fn, next sampling instant tn+1When arrival, sampling instant t is obtainedn+1Reality
When time delay value Δ tn+1, in next but one sampling instant tn+2Before arrival, according to sampling instant tn+1Real-time time delay value Δ tn+1
Quickly from audio signal fn+1' in eliminate audio signal fn+1, and control audio output module output and eliminate the audio letter after echo
Number；And so on, the real-time time delay value of dynamic acquisition in communication process is completed, and both sides are eliminated according to the real-time time delay value back and forth and are existed
Echo signal during VOIP phone obtains clear glitch-free other side's acoustical signal, when equipment moves to different external environment
In, the real-time time delay value in external environment instantly is found again, is moved in circles, and dynamic eliminates talk echo, improves user's communication
Experience.
Detailed description of the invention
Fig. 1 is to obtain basic time delay value Δ t0Working principle block diagram；
Fig. 2 is according to basic time delay value Δ t0Quickly eliminate the working principle block diagram of talk echo；
Fig. 3 is the real-time time delay value Δ t of dynamic acquisitionnWorking principle block diagram；
Fig. 4 is the working principle block diagram that dynamic eliminates talk echo.
Specific embodiment
Below in conjunction with embodiment, technical solution of the present invention is clearly and completely described, it is clear that described
Embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field
Technical staff's every other embodiment obtained under the premise of not making the creative labor belongs to what the present invention protected
Range.
Refering to fig. 1-4, the present invention provides a kind of technical solution: as shown in Figure 1, a kind of echo for improving VOIP phone quality
Removing method, comprising the following steps:
S1: basic time delay value Δ t is obtained0: before starting voice communication, acquisition is made of hardware time delay and basic environment time delay
Basic time delay value Δ t0, specifically includes the following steps:
S101: echo cancellation process device exports auxiliary sampling audio signal f0To audio receiving module, it is preferred that the auxiliary
Sampled audio signal f0For single track audio, it is convenient for processing auxiliary sampling audio signal f0Waveform, before extremely short formal call
It, being capable of THE ADIABATIC SHEAR IN processing auxiliary sampling audio signal f in period0, so that just being had reached in formal call preferable logical
Talk about quality；Echo cancellation process device record exports the auxiliary sampling audio signal f0At the time of, it is denoted as t1；
During this, microphone receives external sound wave always, is converted to audio signal f0', and synchronize be sent in buffer area into
Row storage；
S102: the audio receiving module receives the auxiliary sampling audio signal f0After be sent to loudspeaker, and send simultaneously
Auxiliary sampling audio signal f0It is stored to buffer area, by auxiliary sampling audio signal f0As benchmark interference signal, just
Time delay value is quickly searched out in the later period；
S103: loudspeaker receives the auxiliary sampling audio signal f0After play out, Acoustic Wave Propagation to microphone, microphone
Receive the sound wave；
S104: echo cancellation process device calls the auxiliary sampling audio signal f stored in buffer area0And audio signal f0' go forward side by side
Row compares, and finds audio signal f0' in occur with auxiliary sampling audio signal f0The initial time of identical audio section, is denoted as t2,
Then basic time delay value Δ t0= t2-t1。
S2: as shown in Fig. 2, non-delay fast echo is eliminated, according to basic time delay value Δ t since voice communication0
Talk echo is quickly eliminated, specifically includes the following steps:
S201: audio receiving module receives the audio signal f that partner transmission comes1；
S202: audio receiving module receives the audio signal f1After be sent to loudspeaker, and send audio signal f simultaneously1
It is stored to buffer area；
During this, microphone receives external sound wave always, is converted to audio signal f1', and synchronize be sent in buffer area into
Row storage；
S203: loudspeaker receives the audio signal f1After play out, Acoustic Wave Propagation to microphone, microphone receives this
Sound wave；
S204: echo cancellation process device calls the audio signal f stored in buffer area1And audio signal f1', according to basic time delay
It is worth Δ t0Quickly from audio signal f1' in eliminate audio signal f1, and control audio output module output and eliminate the audio after echo
Signal.
Before call does not start, the voice signal of no both call sides exports auxiliary sampling sound by echo cancellation process device
Frequency signal f0As benchmark interference signal, obtain under external environment locating for the hardware environment and equipment that equipment can be provided
Basic time delay value Δ t0, echo cancellation process device records basis time delay value Δ t0, can accordingly be wiped out pair when starting call
It should be in basic time delay value Δ t0With audio signal f1Identical audio section (interference signal), so that the energy when just starting call
The echo for enough eliminating first voice that other side issues, is transmitted to other side by audio output module for noise-free one's own side's sound
In receiving device.
As shown in figure 3, a kind of echo cancel method of improvement VOIP phone quality, including dynamic in communication process
Acquire real-time time delay value Δ tn, and the step of dynamic eliminates talk echo, specifically includes the following steps:
SS1: real-time time delay value Δ t is obtainedn: in communication process, obtains be made of hardware time delay and real time environment time delay in real time
Real-time time delay value Δ tn, specifically includes the following steps:
SS101: audio receiving module receives the audio signal f that other side's transmission comesn, record it and receive audio signal fnWhen
Carve tn；
SS102: audio receiving module receives the audio signal fnAfter be sent to loudspeaker, and send audio signal f simultaneouslyn
And time data tnIt is stored to buffer area, audio signal fnAs the benchmark interference signal after formal call, the time number
According to tnTo receive the audio signal f that other side's transmission comesnAt the time of；
During this, microphone receives external sound wave always, is converted to audio signal fn', and synchronize be sent in buffer area into
Row storage；
SS103: loudspeaker receives the audio signal fnAfter play out, Acoustic Wave Propagation to microphone, microphone receives
The sound wave；
SS104: echo cancellation process device calls the audio signal f stored in buffer arean' and other side transmission come audio letter
Number fnAnd be compared, find audio signal fn' in occur with the audio signal fnThe initial time of identical audio section, note
For tn', then real-time time delay value Δ tn=tn’-tn；
SS2: as shown in figure 4, non-delay fast echo is eliminated, according to real-time time delay value Δ t in communication processnQuickly eliminate call
Echo: in next sampling instant tn+1Before arrival, echo cancellation process device calls the other side's transmission stored in buffer area
Audio signal fnAnd the audio signal f that microphone receivesn', according to current real-time time delay value Δ tnQuickly from audio signal
fn' in eliminate audio signal fn, and control audio output module output and eliminate the audio signal after echo；
Next sampling instant tn+1When arrival, circulation step SS101 ~ SS104 obtains sampling instant tn+1Real-time time delay value Δ
tn+1, in next but one sampling instant tn+2Before arrival, according to sampling instant tn+1Real-time time delay value Δ tn+1Quickly from audio
Signal fn+1' in eliminate audio signal fn+1, and control audio output module output and eliminate the audio signal after echo；
And so on, the real-time time delay value of dynamic acquisition in communication process is completed, and both sides are eliminated according to the real-time time delay value back and forth
Echo signal during VOIP phone obtains clear glitch-free other side's acoustical signal, when equipment moves to different external rings
In border, the real-time time delay value in external environment instantly being found again, is moved in circles, dynamic eliminates talk echo, and it is logical to improve user
Words experience.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention
It is interior.
Claims (3)
1. a kind of echo cancel method for improving VOIP phone quality, it is characterised in that: the following steps are included:
S1: basic time delay value Δ t is obtained0: before starting voice communication, acquisition is made of hardware time delay and basic environment time delay
Basic time delay value Δ t0, specifically includes the following steps:
S101: echo cancellation process device exports auxiliary sampling audio signal f0To audio receiving module, the record output auxiliary is adopted
Sample audio signal f0At the time of, it is denoted as t1；
During this, microphone receives external sound wave always, is converted to audio signal f0', and synchronize to be sent in buffer area and carry out
Storage；
S102: the audio receiving module receives the auxiliary sampling audio signal f0After be sent to loudspeaker, and simultaneously send should
Auxiliary sampling audio signal f0It is stored to buffer area；
S103: loudspeaker receives the auxiliary sampling audio signal f0After play out, Acoustic Wave Propagation to microphone, microphone
Receive the sound wave；
S104: echo cancellation process device calls the auxiliary sampling audio signal f stored in buffer area0And audio signal f0' and carry out
It compares, finds audio signal f0' in occur with auxiliary sampling audio signal f0The initial time of identical audio section, is denoted as t2, then
Basic time delay value Δ t0= t2-t1；
S2: non-delay fast echo is eliminated, according to basic time delay value Δ t since voice communication0It quickly eliminates and converses back
Sound, specifically includes the following steps:
S201: audio receiving module receives the audio signal f that partner transmission comes1；
S202: audio receiving module receives the audio signal f1After be sent to loudspeaker, and send audio signal f simultaneously1Extremely
Buffer area is stored；
During this, microphone receives external sound wave always, is converted to audio signal f1', and synchronize to be sent in buffer area and carry out
Storage；
S203: loudspeaker receives the audio signal f1After play out, Acoustic Wave Propagation to microphone, microphone receives this
Sound wave；
S204: echo cancellation process device calls the audio signal f stored in buffer area1And audio signal f1', according to basic time delay
It is worth Δ t0Quickly from audio signal f1' in eliminate audio signal f1, and control audio output module output and eliminate the audio after echo
Signal.
2. a kind of echo cancel method for improving VOIP phone quality according to claim 1, it is characterised in that: further include
The real-time time delay value Δ t of dynamic acquisition in communication processn, and the step of dynamic eliminates talk echo, specifically includes the following steps:
SS1: real-time time delay value Δ t is obtainedn: in communication process, acquisition is made of hardware time delay and real time environment time delay in real time
Real-time time delay value Δ tn, specifically includes the following steps:
SS101: audio receiving module receives the audio signal f that other side's transmission comesn, record it and receive audio signal fnWhen
Carve tn；
SS102: audio receiving module receives the audio signal fnAfter be sent to loudspeaker, and send audio signal f simultaneouslyn
And time data tnIt is stored to buffer area；
During this, microphone receives external sound wave always, is converted to audio signal fn', and synchronize to be sent in buffer area and carry out
Storage；
SS103: loudspeaker receives the audio signal fnAfter play out, Acoustic Wave Propagation to microphone, microphone receives this
Sound wave；
SS104: echo cancellation process device calls the audio signal f stored in buffer arean' and other side transmission come audio letter
Number fnAnd be compared, find audio signal fn' in occur with the audio signal fnThe initial time of identical audio section, note
For tn', then real-time time delay value Δ tn=tn’-tn；
SS2: non-delay fast echo is eliminated, according to real-time time delay value Δ t in communication processnQuickly eliminate talk echo: next
A sampling instant tn+1Before arrival, echo cancellation process device calls the other side stored in buffer area to transmit the audio signal f of comingn
And the audio signal f that microphone receivesn', according to current real-time time delay value Δ tnQuickly from audio signal fn' in eliminate sound
Frequency signal fn, and control audio output module output and eliminate the audio signal after echo；
Next sampling instant tn+1When arrival, circulation step SS101 ~ SS104 obtains sampling instant tn+1Real-time time delay value Δ
tn+1, in next but one sampling instant tn+2Before arrival, according to sampling instant tn+1Real-time time delay value Δ tn+1Quickly from audio
Signal fn+1' in eliminate audio signal fn+1, and control audio output module output and eliminate the audio signal after echo；
And so on, the real-time time delay value of dynamic acquisition in communication process is completed, and dynamic eliminates talk echo.
3. a kind of echo cancel method for improving VOIP phone quality according to claim 1, it is characterised in that: described
Auxiliary sampling audio signal f0For single track audio.
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| CN111683184A (en) * | 2020-05-21 | 2020-09-18 | 浙江大华技术股份有限公司 | Echo signal processing method, echo signal processing device and computer storage medium |
| CN111683184B (en) * | 2020-05-21 | 2021-09-10 | 浙江大华技术股份有限公司 | Echo signal processing method, echo signal processing device and computer storage medium |
| CN112201268A (en) * | 2020-09-09 | 2021-01-08 | 北京小米松果电子有限公司 | Echo cancellation method, echo cancellation device, and storage medium |
| CN112583970A (en) * | 2020-12-04 | 2021-03-30 | 斑马网络技术有限公司 | Vehicle-mounted Bluetooth echo cancellation method and device, vehicle-mounted terminal and storage medium |
| CN113763945A (en) * | 2020-12-29 | 2021-12-07 | 北京沃东天骏信息技术有限公司 | Voice awakening method, device, equipment and storage medium |
| WO2022218175A1 (en) * | 2021-04-17 | 2022-10-20 | 华为技术有限公司 | Method for estimating echo delay between distributed devices, and electronic device |
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