CN1801773A - Method and system for transmitting data on gateway - Google Patents
Method and system for transmitting data on gateway Download PDFInfo
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- CN1801773A CN1801773A CNA2005100326933A CN200510032693A CN1801773A CN 1801773 A CN1801773 A CN 1801773A CN A2005100326933 A CNA2005100326933 A CN A2005100326933A CN 200510032693 A CN200510032693 A CN 200510032693A CN 1801773 A CN1801773 A CN 1801773A
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Abstract
Present invention discloses method and system for transmitting data in gateway. Said system package includes encoder consisting of voice encoder and non - voice encoder, VAD module, system controller, switch module, decoder, data cache module. Said method contains system controller system controller cache t2 time before data signal data signal loading encoder, said t2 time is the time of VAD module judged exit mute stage posterior to the time of data signal exit mute stage, VAD module judging entering mute stage, delaying t1+t2 time then switching data signal data signal from voice encoder to non - voice encoder, said t1 time is the time of module judged early than data signal entering mute stage. Said invention saves at least by half band width and greatly raises data transparent transmission usability.
Description
Technical field
The present invention relates to a kind of method and system, especially a kind of method and system of on gateway, transmitting data by the transparent transmission mode at the gateway transmitting data.
Background technology
Rapid development of network technology makes that utilizing group technology to come transmitting multimedia to become may and come true.Tradition mechanics of communication and group technology convergence are more and more obvious, because the Media Stream coded system of transmitting in traditional communication network and the modern packet communications network is different, therefore the binding site at legacy network and packet network needs codec to carry out the conversion of Media Stream coded system, realize this conversion equipment we be referred to as gateway.
The Media Stream of gateway processes mainly comprises at present: voice flow, data flow, video flowing etc., data flow wherein mainly is meant the signal that data equipments such as facsimile machine, modem send in reciprocal process, at present industry mainly contains by the mode of gateway passes data flow: transparent transmission mode and mode T.38.
The transparent transmission mode is meant the code encoding/decoding mode of agreement regulation G.711 by ITU-T, and data flow is handled as the encoding and decoding that common voice flow can't harm.The advantage of this mode is to realize simply, need not be concerned about the implication of concrete data-signal, only be used as voice handle just passable, very little to the disposal ability consumption of gateway; Shortcoming is that occupied bandwidth is big, is subjected to the IP network influence of fluctuations bigger, is difficult to resist the packet loss and the time delay that occur on the IP network and changes, and this mode can be applied in the processing to various data equipment data flow.
T.38 mode is meant the agreement T.38 by ITU-T, facsimile machine send follow ITU-T T.30 the facsimile signal of agreement be converted into the T.38 facsimile message that is fit to the transmission of IP bearer network and carry out transmission manner.The advantage of this mode is because adopted the T.38 message that relatively is fit to the transmission of IP bearer network that fax-traffic is transmitted, and is more intense to the defensive ability/resistance ability that occurs various damages on the IP network, bigger success rate and the stability that improves fax; Shortcoming is to realize more complicated, and is bigger to the disposal ability consumption rate of gateway, and can only be applied to common facsimile service, for other data services such as modem and high-speed facsimiles, can only depend on the transparent transmission mode and realize.
Along with the continuous development of data service, the kind of data service emerges in an endless stream, because T.38 mode can only be applied to the limitation of common facsimile service, the transparent transmission mode realizes simple, the wide characteristics of range of application with it, more and more is subjected to everybody attention.The thing followed is exactly the research to its optimizing application, such as realizing according to the RFC2198 agreement methods such as static Jitter Buffer are handled, realized the message recipient to the redundancy of message G.711, the transparent transmission mode is resisted the ability that the packet loss that occurs on the IP network and time delay change and is significantly improved.
But the problem that transparent transmission mode occupied bandwidth is big but never is well solved.Because adopt the G.711 code encoding/decoding mode of agreement regulation of ITU-T, under the situation that does not adopt the RFC2198 redundancy, occupied bandwidth is 64k bps, occupied bandwidth is 128k bps during redundancy 1 frame, occupied bandwidth is up to 192k bps during redundancy 2 frames, and this is difficult to accept for a lot of band-limited application scenarios.
Summary of the invention
The objective of the invention is to,, propose a kind of method and system, reduce the bandwidth that the transparent transmission mode takies, improve the availability of data penetration transmission mode when the transmission data at the gateway transmitting data at the deficiencies in the prior art.
For achieving the above object, the invention provides a kind of method of on gateway, transmitting data by the transparent transmission mode, the encoder that the communication system that this method relates to comprises Voice Activity Detector (VAD) module, system controller, be made up of voice encryption device and non-voice encoder, by the decoder that voice decoder and non-voice decoder are formed, this method may further comprise the steps:
Step 1, data-signal was sent into before the encoder by the system controller buffer memory t2 time, the VAD module detects this data-signal simultaneously, this data-signal buffer memory t2 sends into encoder after the time, and the described t2 time is that data-signal withdraws from the quiet stage and is later than the time that this data-signal really withdraws from the quiet stage;
If step 2 VAD module detects this data-signal when being non-mute signal, enter voice encryption device by described this data-signal of VAD module controls and encode, through the transmission of communication channel, in decoding end by voice decoder decoding back output; If the VAD module is when detecting this data-signal, after judging that this data-signal enters the quiet stage, the delay t1+t2 time switches to non-voice encoder with this data-signal by voice encryption device and encodes, and through traffic channel, exports after decoding end is by non-voice decoder decode.
The described t1 time is judged moment that this data-signal enters the quiet stage for the VAD module and really enters the time in quiet stage early than this data-signal.
Above-mentioned t1 time, t2 time are measured data-signal according to the silence detection algorithm by the VAD module and obtain, and the described t2 time sends system controller to by the VAD module.And, the moment that the data-signal that obtains when mensuration enters the quiet stage really enters time in quiet stage and data-signal early than this data-signal and withdraws from the quiet stage to be later than time that this data-signal really withdraws from the quiet stage be one when above, and described t1 time, t2 time are respectively the maximum of above-mentioned more than one corresponding time.
The invention allows for a kind of system of on gateway, transmitting data method by the transparent transmission mode, comprise data cache module, the VAD module, encoder, switch module, system controller, communication channel and decoder, described encoder comprises voice encryption device, non-voice encoder, described decoder comprises voice decoder and non-voice decoder, described system controller respectively with the VAD module, encoder, communication channel, decoder is connected with data cache module, described data cache module be used for according to the control signal of system controller will be in input channel data signals transmitted enter the buffer memory t2 time before the encoder;
Described switch module comprises coding side switch and decoding end switch, control signal according to the VAD module, the coding side switch connects data cache module and voice encryption device or non-voice encoder, voice encryption device or non-voice encoder are connected with communication channel, described communication channel is connected with the decoding end switch, the decoding end switch is connected with voice decoder or non-voice decoder respectively according to control signal, and voice decoder or non-voice decoder are connected with delivery channel;
Described VAD module is used to detect the data-signal of input channel, when if this data-signal is non-mute signal, the control switch module makes this data-signal enter voice encryption device and encodes, and through the transmission of communication channel, is exported by delivery channel by voice decoder decoding back in decoding end; If when detecting this data-signal, after judging that this data-signal enters the quiet stage, the delay t1+t2 time switches to non-voice encoder by voice encryption device by switch module with this data-signal and encodes, through the transmission of communication channel, after decoding end is by non-voice decoder decode, export by delivery channel.
In addition, in described VAD module, can also comprise delay cell, be used for judging after this data-signal enters the quiet stage postponing the t1+t2 time when described VAD module.
In data service is used, the transmission of data generally all is semiduplex, promptly when a side sends data, the opposing party is in accepting state, can not send data,, will be applied to the transparent transmission mode of data service after the voice compression technique improvement according to method and system of the present invention to the other side, to save the bandwidth of half at least, improved the availability of data penetration transmission mode greatly.
Description of drawings
The theory diagram that Fig. 1 transmits in communication system for the voice signal of taking the silence compression technology of the prior art;
Fig. 2 is the contrast schematic diagram of voice signal input and output when adopting system shown in Figure 1;
Fig. 3 is a flow chart of the present invention;
The contrast schematic diagram of the data-signal input and output of Fig. 4 after for the step 1 that adopts the method for the invention;
Fig. 5 is the contrast schematic diagram of data-signal input and output after employing the method for the invention;
Fig. 6 is the theory diagram of system of the present invention.
Embodiment
Below the present invention will be described in detail by specific embodiment and accompanying drawing.
The invention provides a kind of method that reduces bandwidth when on gateway, transmitting data by the transparent transmission mode, the method of the invention as shown in Figure 3, the contrast schematic diagram of data-signal input and output such as Fig. 4, shown in Figure 5, when signal is imported by input channel, first this data-signal buffer memory t2 time, the described t2 time is that data-signal withdraws from the quiet stage and is later than the time that this data-signal really withdraws from the quiet stage; And judge whether to enter the quiet stage, if do not have, the VAD module detects this data-signal when being non-mute signal, entering voice encryption device by described this data-signal of VAD module controls encodes, transmission through communication channel, export by voice decoder decoding back in decoding end, if when detecting quiet stage, the delay t1+t2 time switches to non-voice encoder with this data-signal by voice encryption device and encodes, through traffic channel, export after decoding end is by non-voice decoder decode, the data-signal of this output is b2.
Particularly, at first by system controller from the VAD module obtain moment that data-signal a1 withdraws from quiet stage A than really withdraw from late t2 of the moment time of quiet stage A and moment that VAD module judgment data signal a1 enters quiet stage A than Zao t1 of the moment time that really enters quiet stage A.T1 time, t2 time described here are determined when transfer of data, not dynamic change with the difference of data-signal, it determines that method is: data-signal is measured according to the silence detection algorithm by the VAD module, different data-signals may have different t1 time, t2 time, when having one when above, get wherein maximum respectively as t1 time, t2 time with described t1 time, corresponding time of t2 time.That is to say that t1 time, t2 time are to be determined by the performance of VAD module.
Determine t1 time, t2 after the time, solved the problem of lossing signal when withdrawing from quiet stage A.Because the VAD module judges that the moment of withdrawing from quiet stage A is than the late t2 time in the moment of really withdrawing from quiet stage A, so data-signal a1 need be sent into the buffer memory t2 time before the encoder, guarantee to judge that in the VAD module when withdrawing from quiet stage, non-quiet data signal a1 has just arrived encoder.After finishing this step, the contrast schematic diagram of reconstruct data signal b1 and original data signal a1 as shown in Figure 4.
Solve the problem of lossing signal when entering quiet stage again.Because the VAD module is judged the moment that enters quiet stage A than the Zao t1 of the moment that really enters quiet stage A, after the VAD module judged to enter quiet stage A, the delay t1 time switched to non-voice encoder with data-signal a1 by voice encryption device again.Consider in order to solve the problem of lossing signal when withdrawing from quiet stage, data-signal a1 has the buffer memory of a t2 time, be equivalent to the judgement of VAD module and enter the moment of quiet stage A enters quiet stage A than the signal of sending into encoder the Zao t1+t2 time in the moment, so after the judgement of VAD module enters quiet stage A, prolonging the t1+t2 time switches to non-voice encoder with data-signal a1 by voice encryption device again, all enters the voice encryption device coding to guarantee non-quiet data signal.After finishing this step, the contrast schematic diagram of reconstruct data signal b2 and original data signal a1 as shown in Figure 5.
The present invention also proposes a kind of system of transmitting data method on gateway by the transparent transmission mode, its theory diagram as shown in Figure 6, comprise VAD module 1, encoder 2, the switch module of forming by coding side switch 31 and decoding end switch 32, system controller 4, communication channel 5, decoder 6 and data cache module 7, described encoder 2 comprises voice encryption device 21, non-voice encoder 22, described decoder 6 comprises voice decoder 61 and non-voice decoder 62, described system controller 4 respectively with VAD module 1, encoder 2, communication channel 5, decoder 6 is connected with data cache module 7, described data cache module 7 be used for according to the control signal of system controller 4 will be in input channel data signals transmitted a1 enter the buffer memory t2 time before the encoder 2;
Control signal according to VAD module 1, coding side switch 31 connects data cache module 7 and voice encryption device 21 or non-voice encoder 22, voice encryption device 21 or non-voice encoder 22 are connected with communication channel 5, decoding end switch 32 connects communication channel 5, decoding end switch 32 is connected with voice decoder 61 or non-voice decoder 62, and voice decoder 61 or non-voice decoder 62 are connected with delivery channel.
Described VAD module 1 is used to detect the data-signal a1 of input channel, when if this data-signal a1 is non-mute signal, VAD module 1 control switch module makes this data-signal enter voice encryption device 21 and encodes, through the transmission of communication channel 5, export by delivery channel by voice decoder 61 decoding backs in decoding end; If when detecting this data-signal a1, after judging that this data-signal a1 enters the quiet stage, the delay t1+t2 time switches to non-voice encoder 22 by voice encryption device 21 by switch module with this data-signal a1 and encodes, through the transmission of communication channel 5, export by delivery channel by non-voice decoder 62 decoding backs in decoding end.
In described VAD module 1, can also comprise delay cell 11, be used for after described VAD module 1 this data-signal of judgement a1 enters the quiet stage, postponing the t1+t2 time.
Data-signal a1 is before entering decoder 2, system controller 4 is with this data-signal a1 buffer memory t2 time, 1 pair of this data-signal of VAD module a1 detects, after judging that this data-signal a1 enters quiet stage A, the delay t1+t2 time switches to non-voice encoder 22 with this data-signal a1 by voice encryption device 21, after carrying out non-voice coding by 22 pairs of mute signals of this non-voice encoder, output to decoder end by communication channel 5, by non-voice decoder 62 decodings, the data-signal b2 of decoding back output reconstruct.
From above-mentioned to technical solution of the present invention specifically in detail as can be known, the present invention is applied in present silence compression technology in the transparent transmission mode of data service, reduces the bandwidth that the transparent transmission mode takies, and improves the availability of data penetration transmission mode.Because in the typical voice signal being arranged the time more than 30～50% is the ambient noise signal that does not contain voice signal.Utilize this characteristics, in speech signal coding, take silence compression (ITU-TG.729 Annex B) can reduce code check greatly, and do not influence voice quality.Referring to Fig. 1, the theory diagram that in communication system, transmits for the voice signal of taking the silence compression technology of the prior art, by speech frame being divided into voice signal frame and non-voice signal (background noise) frame, and this frame is taked different coding load modes, reduced code check.When voice signal a is input to encoder by input channel, at first this voice signal is detected by the Voice Activity Detection module, according to testing result, this voice signal is voice signal or non-voice signal as can be known, if voice signal, making this voice signal enter voice encryption device by VAD module or this system controller control switch module encodes, if non-voice signal, controlling this voice signal enters non-voice encoder and encodes, signal behind the coding enters communication channel, signal according to traffic channel is voice signal frame or non-voice signal frame, the signal of control traffic channel enters voice decoder or corresponding non-voice decoder, reconstructs voice signal b.Utilize the silence detection technology, only send a spot of background noise characteristic information (15bit/frame) during quiet stage A, the average bandwidth of communication process is reduced to original half.
The silence compression technology can reduce the bandwidth that takies communication channel significantly, but present silence compression technology directly can not be applied in the transparent transmission mode of data service, if directly use, has some problems.Referring to Fig. 2, the contrast schematic diagram of voice signal input and output during for system shown in Figure 1, in the algorithm of VAD module, judgement voice signal a enters quiet stage A and withdraws from quiet stage A all a corresponding judgement thresholding, cause the voice signal of when entering quiet stage A, losing the t1 time span, when withdrawing from quiet stage A, lose the voice signal of t2 time span, cause that reconstructed speech signal b's is imperfect, the signal of losing is because level is very little, time is very short, is difficult to be discovered in voice signal.But for data-signal, this incomplete signal but is unacceptable, and receiver equipment may think that signal generation saltus step or cycle are imperfect and it is unusual to take place, even causes the data service failure.And the present invention by improving, has overcome the problems referred to above after the thought that makes full use of the silence compression technology, saves the bandwidth of half at least, has improved the availability of data penetration transmission mode greatly.
It should be noted that at last above embodiment only in order to the explanation the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification has been described in detail the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1, a kind of method at the gateway transmitting data, the encoder that the communication system that this method relates to comprises VAD module, system controller, be made up of voice encryption device and non-voice encoder, the decoder of forming by voice decoder and non-voice decoder, it is characterized in that this method may further comprise the steps:
Step 1, data-signal was sent into before the encoder by the system controller buffer memory t2 time, the Voice Activity Detector module detects this data-signal simultaneously, this data-signal buffer memory t2 sends into encoder after the time, and the described t2 time is that data-signal withdraws from the quiet stage and is later than the time that this data-signal really withdraws from the quiet stage;
If step 2 Voice Activity Detector module detects this data-signal when being non-mute signal, entering voice encryption device by described this data-signal of Voice Activity Detector module controls encodes, through the transmission of communication channel, export by voice decoder decoding back in decoding end; If the Voice Activity Detector module is when detecting this data-signal, after judging that this data-signal enters the quiet stage, the delay t1+t2 time switches to non-voice encoder with this data-signal by voice encryption device and encodes, through traffic channel, after decoding end is by non-voice decoder decode, export; The described t1 time is judged moment that this data-signal enters the quiet stage for the Voice Activity Detector module and really enters the time in quiet stage early than this data-signal.
2, the method at the gateway transmitting data according to claim 1, it is characterized in that, described t1 time, t2 time are measured data-signal according to the silence detection algorithm by the Voice Activity Detector module and obtain, and described t1 time, t2 time send system controller to by the Voice Activity Detector module.
3, the method at the gateway transmitting data according to claim 1 and 2, it is characterized in that described t1 time, t2 time are respectively by the Voice Activity Detector module and data-signal are measured the maximum that obtains the corresponding time more than one according to the silence detection algorithm.
4, a kind of system in gateway transmitting data method, comprise the Voice Activity Detector module, encoder, switch module, system controller, communication channel and decoder, described encoder comprises voice encryption device, non-voice encoder, described decoder comprises voice decoder and non-voice decoder, it is characterized in that, also comprise data cache module, described system controller respectively with data cache module, the Voice Activity Detector module, encoder, communication channel is connected with decoder, and described data cache module is used for will be by next data-signal buffer memory t2 time before entering encoder of input channel transmission according to the control signal of system controller;
Described switch module comprises coding side switch and decoding end switch, control signal according to the Voice Activity Detector module, the coding side switch connects data cache module and voice encryption device or non-voice encoder, voice encryption device or non-voice encoder and communication channel, and the decoding end switch connects communication channel and voice decoder or non-voice decoder, voice decoder or non-voice decoder and delivery channel;
Described Voice Activity Detector module is used to detect the data-signal of input channel, when if this data-signal is non-mute signal, the control switch module makes this data-signal enter voice encryption device and encodes, through the transmission of communication channel, export by delivery channel by voice decoder decoding back in decoding end; If when detecting this data-signal, after judging that this data-signal enters the quiet stage, the delay t1+t2 time switches to non-voice encoder by voice encryption device by switch module with this data-signal and encodes, through the transmission of communication channel, after decoding end is by non-voice decoder decode, export by delivery channel.
5, the system in gateway transmitting data method according to claim 4, it is characterized in that, in described Voice Activity Detector module, also comprise delay cell, be used for judging after this data-signal enters the quiet stage postponing the t1+t2 time when described Voice Activity Detector module.
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| CNB2005100326933A CN100384183C (en) | 2005-01-02 | 2005-01-02 | Method and system for transmitting data on gateway |
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| CNB2005100326933A CN100384183C (en) | 2005-01-02 | 2005-01-02 | Method and system for transmitting data on gateway |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155095B (en) * | 2006-09-29 | 2010-09-08 | 华为技术有限公司 | Method, system and gateway for negotiation of data signal detector ability |
| CN108234078A (en) * | 2017-12-29 | 2018-06-29 | 成都天奥信息科技有限公司 | A kind of information coding processing method applied to data radio station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1479494A (en) * | 2002-08-31 | 2004-03-03 | 深圳市中兴通讯股份有限公司上海第二 | System of interconnecting CDMA system and radiolocal network |
| CN1484428A (en) * | 2002-09-20 | 2004-03-24 | 上海伟功网络通信技术有限公司 | IP telephone system adopting code-converting privacy technology |
| KR100501324B1 (en) * | 2002-12-30 | 2005-07-18 | 삼성전자주식회사 | Call Routing Method based on MOS prediction value |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155095B (en) * | 2006-09-29 | 2010-09-08 | 华为技术有限公司 | Method, system and gateway for negotiation of data signal detector ability |
| US8179927B2 (en) | 2006-09-29 | 2012-05-15 | Huawei Technologies Co., Ltd. | Method, system and gateway for negotiating the capability of data signal detector |
| CN108234078A (en) * | 2017-12-29 | 2018-06-29 | 成都天奥信息科技有限公司 | A kind of information coding processing method applied to data radio station |
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