CN105469803B - Echo cancel method and system in tripartite's telecommunication based on left and right acoustic channels coding - Google Patents
Echo cancel method and system in tripartite's telecommunication based on left and right acoustic channels coding Download PDFInfo
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- 238000002592 echocardiography Methods 0.000 description 6
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- 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
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Abstract
It is a kind of based on left and right acoustic channels coding tripartite's telecommunication in echo cancel method and system, include: first from side to first from side issue audio data and first from side receive audio data encodes；Second, which receives audio data from side from side's sending audio data and second to second from side, encodes；The audio data that main side issues and decoded first are carried out stereo process from the audio data just issued from the audio data just issued and decoded second by main side, obtain the first data, the second data and third data；Main side encodes the first data and the second data respectively；First plays the first audio data from side's sending audio data and the second data mixing from side；Second plays the second audio data from side's sending audio data and the first data mixing from side；Main side plays the audio data of third data.With this, the echo cancellor of tripartite's telecommunication is realized, it is ensured that good audio when tripartite's telecommunication does not generate associated echo interference.
Description
Technical field
The present invention relates to telecommunication field, echo disappears in espespecially a kind of tripartite's telecommunication based on left and right acoustic channels coding
Except method and system.
Background technique
In recent years, with the development of audio and video technology, network technology and computer technology, many law courts are to some
Verified evidence, the clear some cases of crime fact, takes and remotely opens a court session.Specifically aiming at the trial of these cases,
Suspect and the public prosecutor of procuratorate may not necessarily will arrive court and try, and suspect brings before the court detention house
Room, the public prosecutor of procuratorate is in the public prosecutor room of procuratorate, and judge remotely brings before the court room court law court, and tripartite passes through audio-video
Interconnect and the real-time synchronization of court's trial service scripts data transmission, allow every side personnel that can see other two sides personnel
Video, hear the sound of other two sides personnel, and then realize that tripartite participated in remotely bringing before the court；It saves for these cases
Convict every time from detention house mention give as security to the red tape among court and mention give as security during time cost and vehicle at
This, procuratorate staff is also unnecessary will to arrive law court, save cost, it is ensured that court's trial safety greatly improves court's trial
Efficiency.It is such bring before the court type order before more and more promoted in law court.
When tripartite remotely brings before the court, to obtain good court's trial effect it is necessary to ensure each participant, either law court,
Procuratorate or detention house will can accomplish either side to other two sides " visible ", " listening clearly ".It is synthesized by picture,
Be easy to solve the problem of " visible " and it is more scabrous be " listening clearly ".It solves " listening clearly ", essence is just
It is the echo interference problem of sound to be solved, if echo interference problem does not solve, certainly will just influences effects,sound, can not carries out
Normal court's trial, or even two sides of other court's trials can not be caught.
The echo interference for remotely bringing before the court middle appearance, mainly as caused by two reasons, i.e. environmental echoes and line echo.Institute
The environmental echoes of meaning, precisely due to court, procuratorate, the public address equipment for bringing before the court room, all go out the sound of tripartite from loudspeaker public address
When coming, air borne is gone inevitably through, local microphone is entered back into.Enter from sound amplifier by air borne
This sound of microphone enters back into encoder if do not removed, and sends back other two sides, then other two sides can hear echo；
This echo is mainly caused by environment, we are known as environmental echoes, which is mainly given with relevant silencing equipment and filtered
Fall, within the scope of not at us, this is solved；So-called line echo is exactly artificially since the live streaming at court's trial scene, recording need
It asks, the sound of each side is deliberately introduced into encoder and generates, this partial sound is known as line echo；For line echo
Removing method is that our emphasis in the art of this patent will solve the problems, such as.
It is that line echo generates main reasons is that user audio-video is required to have with its capacity of equipment disposed it is certain
Caused by mismatch, such as constructed high-definition digital court, many law courts at present, it is only configured with a high definition encoder, is used
It is encoded in the picture of synthesis all the way to each important trial participant composition in court, which is mainly used for
Video recording and externally live streaming, in the encoding stream, audio contains the audio mixing of the sound of whole trial participants, to record
As in or in live court's trial, the sound of all trial participants can be heard.If carrying out remotely bringing before the court room in tripartite, from depositing
The angle that shelves are put on record is set out, and encoding stream of this road comprising all trial participant audio mixings is must be to be offered, is used for court's trial
Video recording and externally live streaming use；But the stream that this includes whole trial participant audio mixings cannot be directly fed to long-range inspection
Cha Yuan and detention house, otherwise procuratorate and detention house can hear the sound of oneself from this data flow, that is, generate
Line echo.
Summary of the invention
Present invention aims at the echo interference problems solved when current tripartite carries out telecommunication.It is specific to utilize coding
The independent control of device, the L channel of decoder and right channel, in the hardware expanding investment for not increasing the codec of existing tripartite
In the case of, to the audio-video of tripartite interconnect in line echo eliminate, improve sound when tripartite's telecommunication
Audio fruit, while also saving the cost of existing equipment transformation.
In order to achieve the above object, the present invention specifically provide it is a kind of based on left and right acoustic channels coding tripartite's telecommunication in echo disappear
Except method, the method includes: first receives audio data difference from side from side's sending audio data and first to first from side
It is encoded；Second receives audio data from side from side's sending audio data and second to second from side encodes respectively；It is main
Side is by audio data that main side issues and decoded first from the audio data just issued and decoded second from square sending
Audio data carry out stereo process, obtain the of the audio data issued comprising first from the audio data just issued and main side
Second data of one data and the audio data issued comprising second from the audio data just issued and main side and comprising first from
The third data of the audio data, the second audio data issued from the audio data just issued and main side that just issue；Main side couple
First data and second data are encoded respectively；First after square broadcast decoder first from side issue audio number
According to the audio data with decoded second data mixing；Second after square broadcast decoder second from side issue audio data and
The audio data of decoded first data mixing；Main side plays the audio data of third data.
In the above-described embodiments, it is preferred that first from square encoder can right channel to first from side issue audio data
Encoded, L channel to first from side issue audio data and first from second just received from side issue audio data and
Main side issues audio data and encodes.Described second receives audio from side from side's sending audio data and second to second from side
Data carry out coding respectively: second from square encoder right channel issue audio data from side to second and encode, it is left
Sound channel issues audio data from side from first just received from side's sending audio data and second to second and main side issues sound
Frequency is according to being encoded.
In the above-described embodiments, it is preferred that the audio data that also issues main side comprising the main side and decoded the
One, which carries out stereo process from the audio data just issued from the audio data just issued and decoded second, includes: main side's decoding
Device decodes the audio data that first encodes from square encoder right channel and the audio that second encodes from square encoder right channel respectively
Data obtain first and issue audio data from side from side's sending audio data and second；Main side's mixer is by described first from side
It issues audio data and second to issue the audio data that audio data and main side issue from side and carry out stereo process, obtain comprising the
One from side issue the audio data that audio data and main side issue the first data and comprising second from side issue audio data and
Second data of the audio data that main side issues and comprising first from the audio data just issued, second from the audio number just issued
According to the third data of the audio data issued with main side.L channel encodes first data in main side's encoder, right
Sound channel encodes second data.
The present invention also provides echo cancelling system in a kind of tripartite's telecommunication based on left and right acoustic channels coding, the systems
Include: first, from square encoder, carries out respectively for receiving audio data from side from side's sending audio data and first to first
Coding；Second, from square encoder, carries out respectively for receiving audio data from side from side's sending audio data and second to second
Coding；Main side's decoder, for decoding first from the audio data just issued and second from the audio data just issued；Main side is mixed
Sound device, audio data for issuing main side and decoded first from the audio data just issued and decoded second from
The audio data just issued carries out stereo process, obtains the audio number issued comprising first from the audio data just issued and main side
According to the first data and the audio data issued comprising second from the audio data just issued and main side the second data and comprising
First from the third data of the audio data just issued, the second audio data issued from the audio data just issued and main side；
Main side's encoder, for being encoded respectively to first data and second data；First from square decoder, for solving
Code first is from the audio data just issued and the second data；First from square player, for first after broadcast decoder from square hair
The audio data of audio data and decoded second data mixing out；Second from square decoder, for decoding second from square hair
Audio data and the first data out；Second from square player, for second after broadcast decoder from side issue audio data and
The audio data of decoded first data mixing；Main side's player, for playing the audio data of third data.
In the above-described embodiments, it is preferred that first encoder also includes: first from square encoder right channel to
One, which issues audio data from side, is encoded, and L channel issues audio data and first from second just received from side to first
Audio data is issued from side and main side issues audio data and encodes.The second encoder also includes: second from square coding
In device right channel to second from side issue audio data encode, L channel to second from side issue audio data and second from
First just received issues audio data from side and main side issues audio data and encodes.The third encoder also wraps
Contain: L channel encodes first data in main side's encoder, and right channel encodes second data.
In the above-described embodiments, the system also may include three Echo Cancellers, and the Echo Canceller is respectively set
In first from side, second from square and main side, for eliminating environmental echoes.
The beneficial technical effect of the present invention lies in: existing deployment does not need to replace in the high definition encoder of tripartite, encodes energy
Power does not need to improve；The high definition encoder of tripartite does not need dilatation, does not need to add new encoder；Encoded data stream is recorded
After, when watching this video recording, hear the audio mixing of all participants；After the live streaming publication of this encoding stream, viewing live streaming
Personnel can hear the audio mixing of all participants；In telecommunication side, the audio mixing of proximal end sender can only be heard；Remotely leading
Side, can only hear the audio mixing of remote communication side Yu proximal end sender；That records is individually sent in the video recording of distal end, can listen simultaneously
To the audio mixing of all participants；That records is individually sent in the video recording of the main side in distal end, can hear all participants simultaneously
Audio mixing.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the process of echo cancel method in tripartite's telecommunication provided by the present invention based on left and right acoustic channels coding
Figure；
Fig. 2 is the signal of echo cancelling system in tripartite's telecommunication provided by the present invention based on left and right acoustic channels coding
Figure.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below with reference to embodiment and attached
Figure, is described in further details the present invention.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention,
But it is not as a limitation of the invention.
Please refer to shown in Fig. 1, the present invention specifically provide it is a kind of based on left and right acoustic channels coding tripartite's telecommunication in echo
Removing method, the method include: S101 first receives audio number from side from side's sending audio data and first to first from side
According to being encoded respectively；S102 second from side to second from side issue audio data and second from side receive audio data respectively into
Row coding；The main side of S103 is by the audio data that main side issues and decoded first from the audio data that just issues and decoded
Second carries out stereo process from the audio data just issued, what acquisition was issued comprising first from the audio data just issued and main side
Second data of the first data of audio data and the audio data issued comprising second from the audio data just issued and main side
And comprising first from the third of the audio data just issued, the second audio data issued from the audio data just issued and main side
Data；The main side of S104 encodes first data and second data respectively；S105 first is after square broadcast decoder
First from side issue audio data and decoded second data mixing audio data；S106 second is after square broadcast decoder
Second from side issue audio data and decoded first data mixing audio data；The main side of S107 plays third data
Audio data.
It is worth noting that above-mentioned steps S105, S106, S107 are simultaneously in above-mentioned technical proposal provided by the present invention
It carries out, coding is only identifier declaration, and corresponding step sequencing is not represented with label.
In the above-described embodiments, it is preferred that first from square encoder can right channel to first from side issue audio data
Encoded, L channel to first from side issue audio data and first from second just received from side issue audio data and
Main side issues audio data and encodes.Described second receives audio from side from side's sending audio data and second to second from side
Data carry out coding respectively: second from square encoder right channel issue audio data from side to second and encode, it is left
Sound channel issues audio data from side from first just received from side's sending audio data and second to second and main side issues sound
Frequency is according to being encoded.
In the above-described embodiments, the audio data that also issues main side comprising the main side and decoded first is from square hair
Audio data and decoded second out carries out stereo process from the audio data just issued and include: main side's decoder solves respectively
The audio data that the audio data and second that code first is encoded from square encoder right channel are encoded from square encoder right channel, obtains
First, which issues audio data and second from side, issues audio data from side；Main side's mixer issues audio number from side for described first
Stereo process is carried out according to the audio data that audio data and main side issue is issued from side with second, is obtained comprising first from square sending
First data of the audio data that audio data and main side issue and comprising second audio data is issued from side and main side issues
It second data of audio data and is sent out from the audio data just issued, second from the audio data just issued and main side comprising first
The third data of audio data out.L channel encodes first data in main side's encoder, and right channel is to described
Second data are encoded.
For echo cancellor in the tripartite's telecommunication provided by the present invention based on left and right acoustic channels coding of clearer explanation
Method does whole introduction to above-described embodiment below, wherein first from square encoder right channel to first from side issue audio
Data are encoded, and L channel issues audio number from second just received from side from side's sending audio data and first to first
It is encoded according to audio data is issued with main side；Second from square encoder right channel to second from side issue audio data carry out
Coding, L channel issue audio data and main side from first just received from side from side's sending audio data and second to second
Audio data is issued to be encoded；Main side's decoder decodes the first audio data and the encoded from square encoder right channel respectively
Two audio datas encoded from square encoder right channel obtain first and issue audio number from side from side's sending audio data and second
According to；Main side's mixer issues the audio of audio data and main side sending by described first from side's sending audio data and second from side
Data carry out stereo process, obtain the left channel data of the audio data issued comprising first from side's sending audio data and main side
And the right data of the audio data of audio data and main side sending is issued from side comprising second；L channel in main side's encoder
The left channel data is encoded, right channel encodes the right data；First decodes master from square decoder
Square encoder right data；First plays the first audio data and main side coding after square encoder L channel coding from side
Device right data；Second decodes main side's encoder left channel data from square decoder；Second plays second from square coding from side
Audio data and main side's encoder left channel data after device L channel coding；Main side plays the left sound after main side's encoder coding
Track data and right data.With this, the method that independent left and right acoustic channels encode alternative sounds is set by the way that codec is arranged,
After this method, in the case where the encoder not to court carries out extending capacity reformation, extraordinary can solve three phonetic aspects of a dialect
Line echo interference when video frequency interconnects, while also ensuring that each participant can hear the sound of other two sides,
And each road encoding stream is recorded the file to get off, when broadcasting, can hear the audio mixing of the sound of three participants.
The present invention also provides echo cancelling systems in a kind of tripartite's telecommunication based on left and right acoustic channels coding, please specifically join
Examine shown in Fig. 2, the system includes: first from square encoder, for connecing from side's sending audio data and first from side to first
Audio data is received to be encoded respectively；Second from square encoder, for connecing from side's sending audio data and second from side to second
Audio data is received to be encoded respectively；Main side's decoder, for decoding first from the audio data just issued and second from square hair
Audio data out；Main side's mixer, audio data for issuing main side and decoded first is from the audio just issued
Data and decoded second carry out stereo process from the audio data that just issues, obtain comprising first from the audio number just issued
The first data according to the audio data issued with main side and the audio that is issued comprising second from the audio data just issued and main side
It second data of data and is issued from the audio data just issued, second from the audio data just issued and main side comprising first
The third data of audio data；Main side's encoder, for being encoded respectively to first data and second data；The
One from square decoder, for decoding first from the audio data just issued and the second data；First from square player, for playing
Decoded first issues the audio data of audio data and decoded second data mixing from side；Second from square decoder,
For decoding second from the audio data just issued and the first data；Second from square player, for second after broadcast decoder
The audio data of audio data and decoded first data mixing is issued from side；Main side's player, for playing third data
Audio data.
In the above-described embodiments, first encoder also includes: first from square encoder right channel to first from side
It issues audio data to be encoded, L channel issues audio data and first from second just received from square hair from side to first
Audio data and main side issue audio data and encode out.The second encoder also includes: second is right from square encoder
Sound channel issues audio data from side to second and encodes, and L channel issues audio data and second from square reception from side to second
To first from side issue audio data and main side and issue audio data and encode.The third encoder also includes: main side
L channel encodes first data in encoder, and right channel encodes second data.
In the above-described embodiments, the system also may include three Echo Cancellers, and the Echo Canceller is respectively set
In first from side, second from square and main side, for eliminating environmental echoes.Relevant technical staff in the field's echo cancellor known to
Device is existing apparatus, and the present invention is not described in detail herein.
To further illustrate echo cancelling system in tripartite's telecommunication provided by the present invention based on left and right acoustic channels coding,
Below with law court, procuratorate and the room of bringing before the court are example, are described briefly to the present invention.It please refers to shown in Fig. 2, it is long-range to participate in tripartite
It brings before the court court's (representing with letter C) of the native court of room, long-range procuratorate (with alphabetical A representative), remotely bring before the court room (with letter
B is indicated).
The right channel of the encoder of procuratorate only encodes the sound A of procuratorate, and L channel is sent to from court
Come over court's sound C, remotely bring before the court room sound B and the audio mixing ABC of this procuratorate sound A is encoded, while this
A audio mixing is sent to local power amplifying device and plays out；After coding, L channel is the audio mixing of tripartite, and right channel only includes procuratorial work
The sound of institute；
The right channel of the encoder in detention house only encodes the sound B in detention house, and L channel is sent to from court
The audio mixing ABC with court's sound C, long-range procuratorate's sound A and this detention house sound B to come over is encoded, while this
A audio mixing is sent to local power amplifying device and plays out；After coding, L channel is the audio mixing of tripartite, and right channel only includes guard
Sound；
Recorded for the encoding stream of procuratorate, since L channel contains tripartite's audio mixing, then video file play when
It waits, can centainly play back the audio mixing of tripartite；The encoding stream in detention house is recorded, since its L channel also includes tripartite
Audio mixing, then video file play when, can also play out the audio mixing of tripartite；
In the court of law court, when decoder decodes procuratorate's encoding stream, its right channel is only solved, obtains procuratorate
Sound A, L channel decoding function closes, and the sound comprising tripartite's audio mixing ABC is dropped；Decoder is to detention house encoding stream solution
When code, its right channel is only solved, obtains the sound B in detention house, L channel decoding function is closed, and includes tripartite's audio mixing ABC's
Data are dropped and (do not abandon the sound A that court can be allowed to hear oneself, cause echo)；
Mixer in court carries out the sound A of procuratorate, the sound B in detention house and court sound C audio mixing, mixes
At the sound A C and court of court and procuratorate and the sound B C in detention house；Then two audio mixings AC, BC are sent to respectively in
L channel, the right channel of court's encoder are encoded；
In court's encoder encoding stream, L channel contains AC sound, and right channel contains the sound of BC, which is carried out
When live streaming, the sound that can hear ABC tripartite of live streaming is watched；When this encoding stream is recorded, video recording is played
When, it still can play out the audio mixing of tripartite；
The decoder of procuratorate, when decoding the encoding stream that court sends out, only it includes courts, guard for decoding
The right channel of institute audio mixing BC, abandons the data of L channel；It (because including the sound A of procuratorate in L channel audio mixing AC, does not abandon
Procuratorate A can be allowed to hear the sound of oneself, cause echo)
The decoder in detention house, when decoding the encoding stream that court sends out, only it includes courts, procuratorial work for decoding
The L channel of institute audio mixing AC, the data for abandoning right channel (because including the sound B in detention house in right channel audio mixing BC, do not abandon
Detention house B can be allowed to hear the sound of oneself, cause echo)；
In order to guarantee the audio of tripartite, also environmental echoes are eliminated, that is, in court, procuratorate, detention house point
Not Fang Zhi Echo Canceller, playing back sound from power amplifier loudspeaker, after entering microphone, this sound for coming from loudspeaker outflow
Sound is eliminated.
Echo cancel method and system in tripartite's telecommunication based on left and right acoustic channels coding provided by through the invention,
In the case where not increasing the configuration of court's high definition court encoder, sound in encoding stream, carried out by L channel, right channel
It distinguishes, and controls the independent decoding that decoder carries out L channel, right channel to encoding stream, realize that tripartite remotely brings before the court in room
The elimination of line echo.And it can reach following simultaneously the utility model has the advantages that the high definition encoder for being previously deployed in court does not need more
It changes, code capacity does not need to improve；The high definition encoder for being previously deployed in court does not need dilatation, does not need to add new coding
Device；After encoded data stream is recorded, when watching this case trial video, the mixed of all trial participants is heard
Sound；After the live streaming publication of this encoding stream, the personnel for watching live streaming can hear the audio mixing of all trial participants；In long-range procuratorial work
In institute, the audio mixing of the judge and long-range suspect in court's trial can only be heard；Interior remotely is being brought before the court, can only hear the method in court's trial
The audio mixing of institute and long-range procuratorate public prosecutor；That records is individually sent in the video recording of procuratorate, can hear all court's trials simultaneously
The audio mixing of participant；That records is individually sent to bring before the court in the video recording of room, can hear the mixed of all trial participants simultaneously
Sound.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (10)
1. a kind of method of echo cancellor in tripartite's telecommunication, which is characterized in that the method includes:
First receives audio data from side from side's sending audio data and first to first from side encodes respectively；
Second receives audio data from side from side's sending audio data and second to second from side encodes respectively；
Main side by the audio data that main side issues and decoded first from the audio data just issued and decoded second from
The audio data just issued carries out stereo process, obtains the audio number issued comprising first from the audio data just issued and main side
According to the first data and the audio data issued comprising second from the audio data just issued and main side the second data and comprising
First from the third data of the audio data just issued, the second audio data issued from the audio data just issued and main side；
Main side encodes first data and second data respectively；
First after square broadcast decoder first from side issue audio data and decoded second data mixing audio data；
Second after square broadcast decoder second from side issue audio data and decoded first data mixing audio data；
Main side plays the audio data of third data.
2. the method for echo cancellor in tripartite's telecommunication according to claim 1, which is characterized in that described first from side
Carrying out coding respectively from side's reception audio data from side's sending audio data and first to first includes: first from square encoder
Right channel issues audio data from side to first and encodes, and L channel connects from side's sending audio data and first from side to first
Second received issues audio data from side and main side issues audio data and encodes.
3. the method for echo cancellor in tripartite's telecommunication according to claim 1, which is characterized in that described second from side
Carrying out coding respectively from side's reception audio data from side's sending audio data and second to second includes: second from square encoder
Right channel issues audio data from side to second and encodes, and L channel connects from side's sending audio data and second from side to second
First received issues audio data from side and main side issues audio data and encodes.
4. the method for echo cancellor in tripartite's telecommunication according to claim 1, which is characterized in that the main side will lead
The audio data that just issues and decoded first is from the audio data just issued and decoded second from the audio just issued
Data carry out stereo process: main side's decoder decodes the first audio data and the encoded from square encoder right channel respectively
Two audio datas encoded from square encoder right channel obtain first and issue audio number from side from side's sending audio data and second
According to；Main side's mixer issues the audio of audio data and main side sending by described first from side's sending audio data and second from side
Data carry out stereo process, obtain comprising first from side issue the audio data that audio data and main side issue the first data and
The second data of the audio data that audio data and main side issue are issued and comprising first from the sound just issued from side comprising second
The third data of frequency evidence, the second audio data issued from the audio data just issued and main side.
5. the method for echo cancellor in tripartite's telecommunication according to claim 1, which is characterized in that the main side is to institute
State the first data and second data carry out encoding respectively and include: L channel carries out first data in main side's encoder
Coding, right channel encode second data.
6. the system of echo cancellor in a kind of tripartite's telecommunication, which is characterized in that the system includes:
First, from square encoder, compiles respectively for receiving audio data from side from side's sending audio data and first to first
Code；
Second, from square encoder, compiles respectively for receiving audio data from side from side's sending audio data and second to second
Code；
Main side's decoder, for decoding first from the audio data just issued and second from the audio data just issued；
Main side's mixer, audio data for issuing main side and decoded first is from the audio data and decoding just issued
Second afterwards carries out stereo process from the audio data just issued, obtains and sends out comprising first from the audio data just issued and main side
The second of first data of audio data out and the audio data issued comprising second from the audio data just issued and main side
Data and comprising first from the audio data just issued, second audio data issued from the audio data just issued and main side
Third data；
Main side's encoder, for being encoded respectively to first data and second data；
First from square decoder, for decoding first from the audio data just issued and the second data；
First issues audio data and decoded second data mixing from side from square player, for first after broadcast decoder
Audio data；
Second from square decoder, for decoding second from the audio data just issued and the first data；
Second issues audio data and decoded first data mixing from side from square player, for second after broadcast decoder
Audio data；
Main side's player, for playing the audio data of third data.
7. the system of echo cancellor in tripartite's telecommunication according to claim 6, which is characterized in that described first from side
Encoder also includes: first from square encoder right channel issue audio data from side to first and encode, L channel is to the
One from side issue audio data and first from second just received from side issue audio data and main side issue audio data into
Row coding.
8. the system of echo cancellor in tripartite's telecommunication according to claim 6, which is characterized in that described second from side
Encoder also includes: second from square encoder right channel issue audio data from side to second and encode, L channel is to the
Two from side issue audio data and second from first just received from side issue audio data and main side issue audio data into
Row coding.
9. the system of echo cancellor in tripartite's telecommunication according to claim 6, which is characterized in that main side's coding
Device also includes: L channel encodes first data in main side's encoder, and right channel compiles second data
Code.
10. the system of echo cancellor in tripartite's telecommunication according to claim 6, which is characterized in that the system is also
Comprising three Echo Cancellers, the Echo Canceller is respectively arranged at first from side, second from square and main side, for eliminating ring
Border echo.
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| CN102348097A (en) * | 2010-08-02 | 2012-02-08 | 杭州华三通信技术有限公司 | Session method and multi-point control unit for video conference |
| CN102457700A (en) * | 2010-10-26 | 2012-05-16 | 中兴通讯股份有限公司 | Audio data transmission method and system |
| CN102572369A (en) * | 2010-12-17 | 2012-07-11 | 华为终端有限公司 | Voice volume prompting method and terminal as well as video communication system |
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