CN100411399C - Method and system for carrying out real-time voice transmission based on Ethernet - Google Patents
Method and system for carrying out real-time voice transmission based on Ethernet Download PDFInfo
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- CN100411399C CN100411399C CNB200510063358XA CN200510063358A CN100411399C CN 100411399 C CN100411399 C CN 100411399C CN B200510063358X A CNB200510063358X A CN B200510063358XA CN 200510063358 A CN200510063358 A CN 200510063358A CN 100411399 C CN100411399 C CN 100411399C
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Abstract
The present invention discloses a system for carrying out real-time voice transmission based on Ethernet. The system is composed of a plurality of network voice devices, wherein the network voice devices are connected with each other through Ethernet and a TCP/IP network. Ethernet is used for tranmitting real-time voice data packages, and the TCP/IP network is used for transmitting request control information between devices. The present invention also discloses a method for carrying out real-time voice transmission based on Ethernet. The method comprises the steps that main control units in the network voice devices pack voice data flows collected by voice modules into Ethernet data packages which are directly transmitted to the called network voice devices through Ethernet; the main control units in the called network voice devices unpack the received voice data packages which are packed into Ethernet data packages, the voice data flows in the voice data packages are extracted, transmitted to the voice modules through a data bus and played by the voice modules which are connected with voice data flows. The system and the method can achieve the real-time transmission of voice data without using a complex voice transmission protocol, and voice delay is minimal.
Description
Technical field
The present invention relates to a kind of Ethernet (Ethernet) link layer that directly utilizes and carry out real-time voice system for transmitting and method.
Background technology
As the patent No. is that ZL 02137269.1 patent is disclosed, and at present, traditional voice transmission method utilizes the H323 agreement to carry out voice transfer (as shown in Figure 1) on network layer.Need build as shown in Figure 2 voice-transmission system in order to be implemented in the purpose of utilizing the H323 agreement to carry out voice transfer on the network layer.This voice-transmission system is made of several calling party A and callee B, and each calling party A/ or callee B are made of traditional speech ciphering equipment such as PBX machine, Audio Processing Unit and gateway.The Audio Processing Unit A of calling party A is responsible for the voice digital data stream that speech ciphering equipment A such as PBX machine provide is compressed into VoP, then, the gateway B of gateway A by calling party A, internet (TCP/IP network), callee B is transferred to the Audio Processing Unit B of callee B, the VoP of being responsible for receiving by the Audio Processing Unit B of callee B de-compresses into voice digital data stream, by speech ciphering equipment B such as the PBX machine of callee B, pass to callee B again; Simultaneously, the Audio Processing Unit B of callee B also is compressed into VoP with the audio data stream that speech ciphering equipment B provides, gateway A by gateway B, internet (TCP/IP network), calling party A is transferred to the Audio Processing Unit A of calling party A, Audio Processing Unit A by calling party A de-compresses into audio data stream with the VoP that receives, be transferred to calling party's speech ciphering equipment A such as PBX machine, pass to calling party A again, thereby, the transmission of voice finished.
By as can be known to the analysis of traditional voice transmission method and system, because traditional voice transfer is to finish by the H323 agreement that is based upon on the ICP/IP protocol basis, so this voice transmission method goes for wide area network, local area network (LAN) and as long as the place that IP can set foot in.But the popularity that is suitable for just because of this voice transmission method is strong, causes the H323 agreement to have to consider the generation of more susceptible condition again, handles more complicated problems, makes the H323 agreement complicated all the more.
Particularly, when being applied to above-mentioned traditional voice transmission method in the local area network (LAN), we find because the complexity of H323 agreement, finish the exchange of VoP, realize in the process of voice transfer using the H323 agreement, be necessary for each calling party and callee and dispose independent Audio Processing Unit and gateway, and carry out complicated Echo Cancellation and handle, make whole voice-transmission system following drawback occur:
1, whole voice-transmission system cost height.
Because the H323 agreement can not guarantee the transmittability of link, can only attempt deacclimatizing the transmittability of link, so consider the transmission needs of low bandwidth, system has disposed independent Audio Processing Unit for each calling party and callee.Finish the compression and decompression of audio data stream by Audio Processing Unit,, reduce the load of network to carry out Network Transmission.
Again because the H323 agreement is very complicated, call out control and transmission of voice packets in order to finish effectively, system has disposed independent computing unit----gateway for each calling party and callee, finishes the call control procedure of voice packet exchange and the conversion of Circuit-switched call control procedure by gateway.
Because will dispose independent Audio Processing Unit and gateway for each calling party and callee, so the system cost height.
2, the transmission link state is uncontrollable.
Because traditional speech data packet technology (H323 agreement) is in order to be applicable to that all can carry the web-transporting device of IP, so, the H323 agreement is not controlled transmission link, but adapt to link change by the complexity that increases host-host protocol, explain in words transmission link for the H323 agreement and be in runaway condition.
3, need complicated Echo Cancellation to handle.
Because voice need in real time, propagate continuously, naturally the custom that so just can meet people's sense of hearing, the H323 agreement adopts RTP to carry out voice transfer, RTP is based on the high efficiency of transmission agreement of UDP, can support the coding transmission of various compress speech, RTP comes transferring voice with the little extra load of trying one's best, but because on IP, IP is an agreement of sending to as possible, so in fact the propagation quality of voice on link is still not controlled, so have in RTP such as header data such as timestamp and sync id, VoP need be handled at the gateway end like this, with rational voice-over-net packet sequenceization, give Audio Processing Unit again and decompress, because not the guaranteeing of participation of calculating and voice packet order, the delay of voice and the packet loss phenomenon that will be inevitable.And along with the IP routing, and the data of the agreement of the necessity of carrying out on IP network simultaneously such as ARP, ICMP are to the paroxysmal influence of transmission link, the rule nonlinear change that causes voice latency and packet loss, unstable echo will influence the real-time voice quality, need increase to have adaptive echo cancellation algorithm process unit and just can allow people's ear accept.
Because the uncontrollability of Ethernet (Ethernet) the network Link State that IP agreement and the more upper-layer protocol of constructing based on the IP agreement cause, making the real-time voice transmission delay is a function of complicated nonlinear change, and handling echo needs somewhat complex design and a lot of extra calculating undoubtedly.
4, voice latency can't be avoided.
In traditional voice packet exchange transmission manner, though can and increase processing unit by design of protocol makes voice intercommunication as far as possible continuously, reduces delay, but obviously need the participation of intensive, the speed of any processing unit all is that its intrinsic limit is arranged, amount of calculation is big more, and time of delay is long more, so, use traditional voice transmission method to transmit real-time voice in packet network, its voice latency will be unavoidable.
5, the systematic jitters that brings of the complexity of H323 agreement.
The method of traditional speech data packet switch transmission real-time voice is very complicated for the generation design that adapts to various link condition, and the standardized process of a lot of parts of whole protocol stack is still underway., this is that the traditional speech data packet switch transmission real-time voice of selection must not irrespective problem equally.
In sum, there are a lot of drawbacks in traditional voice transmission method in local area network (LAN).
Summary of the invention
In order to solve the drawback that voice transmission method traditional in local area network (LAN) exists, the purpose of this invention is to provide a kind of method of carrying out the real-time voice transmission based on Ethernet (Ethernet).This method can realize the real-time Transmission of voice, and the voice latency of minimum and stable and controllable does not need extra Echo Cancellation to handle.
Another object of the present invention provides a kind ofly carries out the real-time voice system for transmitting based on Ethernet (Ethernet), this system do not need for each calling party/or the callee dispose extra compress speech and decompression processing unit and gateway device, promptly can realize based on the transmission of the real-time voice of Ethernet (Ethernet).
For achieving the above object, the present invention is by the following technical solutions: a kind ofly carry out the real-time voice system for transmitting based on Ethernet (Ethernet), it is made of the plurality of network speech ciphering equipment, it is characterized in that:
Be formed by connecting by Ethernet (Ethernet) and TCP/IP net between each voice-over-net equipment; Ethernet (Ethernet) only is used to transmit the real-time voice packet, and it does not carry any procotol; The TCP/IP net is used for the request control information between transmission equipment.
Each voice-over-net equipment is made up of voice module, Ethernet (Ethernet) Network Interface Module, TCP/IP net Network Interface Module and main control unit; Link to each other transmitting audio data by data/address bus between main control unit and voice module, two Network Interface Modules; Voice-over-net equipment links to each other with Ethernet (Ethernet) by Ethernet (Ethernet) Network Interface Module, transmission real-time voice packet; Voice-over-net equipment also links to each other by TCP/IP net Network Interface Module and TCP/IP net, be used for and other voice-over-net equipment and other network systems interconnected, the transmission request control information between transmission equipment; Wherein,
Voice module mainly is responsible for collection/broadcast audio data stream; The mainly responsible audio data stream with the voice module collection of main control unit breaks into Ethernet (Ethernet) VoP and is transferred to the called network speech ciphering equipment by Ethernet (Ethernet) Network Interface Module, Ethernet (Ethernet), simultaneously, main control unit is responsible for that also the called network speech ciphering equipment is transmitted the VoP that breaks into Ethernet (Ethernet) data packet form of returning and is unpacked, extract audio data stream wherein, and play back by voice module.
A kind of method of carrying out the real-time voice transmission provided by the invention based on Ethernet (Ethernet), it may further comprise the steps:
A, each the voice-over-net equipment in the voice-transmission system is coupled together by Ethernet (Ethernet) and TCP/IP net;
B, voice module, main control unit and Ethernet (Ethernet) Network Interface Module, TCP/IP Network Interface Module in each voice-over-net equipment are coupled together by internal data bus;
Only transmit the real-time voice packet and do not carry any procotol by Ethernet between C, each voice-over-net equipment, by the request control information between TCP/IP net transmission equipment;
Concrete steps are as follows:
1, the main control unit in each voice-over-net equipment breaks into Ethernet (Ethernet) VoP with the audio data stream of voice module collection, through Ethernet (Ethernet) Network Interface Module, directly be transferred to the called network speech ciphering equipment by Ethernet (Ethernet);
2, the main control unit in the called network speech ciphering equipment will unpack by the VoP that breaks into Ethernet (Ethernet) data packet form that Ethernet (Ethernet) Network Interface Module receives, extract audio data stream wherein, be transferred to coupled voice module by data/address bus, play back by voice module.
As from the foregoing, the present invention directly carries out the real-time voice transmission by Ethernet (Ethernet) network link layer, do not carry any procotol at this layer, have only link protocol itself, the real-time Transmission of responsible VoP only, so, the present invention does not need complicated voice transfer protocol just can realize the real-time Transmission of speech data, accomplish the voice latency of minimum and stable and controllable, and, do not need extra Echo Cancellation to handle.
Again because the system of realization speech data real-time Transmission provided by the invention adopts the design of independent networking, be transmission and the exchange that Ethernet (Ethernet) is specifically designed to the real-time voice data, the TCP/IP net is specifically designed to the request and the control information of each voice-over-net equipment room of transmission, so, the present invention has reduced the complexity of VoP switched call control protocol, do not need to greatly reduce system cost for each voice-over-net equipment disposition extra gateway device and speech compression/decompression processing unit.
Description of drawings
Fig. 1 is traditional speech data packet switching protocol (H323 agreement) network model
Fig. 2 is traditional voice-transmission system system configuration schematic diagram
Fig. 3 is for the present invention is based on the system configuration schematic diagram that Ethernet (Ethernet) carries out the real-time voice transmission system
Fig. 4 forms structural representation for each voice-over-net equipment of the present invention
Fig. 5 the present invention is based on the network layer model that link layer is realized the real-time voice packet exchange
Embodiment
As shown in Figure 3, provided by the inventionly carry out the real-time voice system for transmitting by plurality of network speech ciphering equipment A, B, C based on Ethernet (Ethernet) ... constitute, be formed by connecting by Ethernet (Ethernet) and TCP/IP net (internet) between each voice-over-net equipment.Wherein, Ethernet (Ethernet) does not carry any procotol, only is used to transmit the real-time voice packet; The TCP/IP net is used for the request control information between transmission equipment.
As shown in Figure 4, each voice-over-net equipment is made up of voice module, Ethernet (Ethernet) Network Interface Module, TCP/IP net Network Interface Module and main control unit again; Link to each other by data/address bus between main control unit and voice module, two Network Interface Modules; Voice-over-net equipment links to each other with Ethernet (Ethernet) by Ethernet (Ethernet) Network Interface Module, transmission real-time voice packet, simultaneously, voice-over-net equipment also links to each other with the TCP/IP net by TCP/IP net Network Interface Module, be used for and other voice-over-net equipment and other network systems interconnected, the transmission request control information between transmission equipment.Wherein, voice module mainly is responsible for collection/broadcast speech data; The mainly responsible audio data stream with the voice module collection of main control unit breaks into Ethernet (Ethernet) VoP and is transferred to the called network speech ciphering equipment by Ethernet (Ethernet) Network Interface Module, Ethernet (Ethernet), simultaneously, main control unit is responsible for that also the called network speech ciphering equipment is transmitted the VoP that breaks into Ethernet (Ethernet) data packet form of returning and is unpacked, extract audio data stream wherein, play back by voice module again; Audio data stream is broken into Ethernet (Ethernet) VoP and separate in the packet procedures at main control unit, whether main control unit is idle by the target ethernet link layer address and the inquiry called network equipment of TCP/IP Network Interface Module, TCP/IP NetFind called network equipment.
Utilize above-mentioned voice-transmission system, the invention provides a kind of method of carrying out the real-time voice transmission based on Ethernet (Ethernet), this method may further comprise the steps:
A, each the voice-over-net equipment in the voice-transmission system is coupled together by Ethernet (Ethernet) and TCP/IP net;
B, voice module, main control unit and Ethernet (Ethernet) Network Interface Module, TCP/IP Network Interface Module in each voice-over-net equipment are coupled together by internal data bus;
Main control unit in C, each voice-over-net equipment breaks into Ethernet (Ethernet) packet with the audio data stream of voice module collection, through Ethernet (Ethernet) Network Interface Module, directly be transferred to the called network speech ciphering equipment by Ethernet (Ethernet);
Main control unit in D, the called network speech ciphering equipment will unpack by the VoP that breaks into Ethernet (Ethernet) data packet form that Ethernet (Ethernet) Network Interface Module receives, extract audio data stream wherein, be transferred to coupled voice module by data/address bus, play back by voice module.
The specific implementation method is:
1, the voice module in the caller voice-over-net equipment is gathered calling party's speech data, converts thereof into voice digital data stream and passes to coupled main control unit by data/address bus;
2, main control unit is according to the callee's number in the audio data stream that receives, utilize the TCP/IP network to seek the target ethernet link layer address of called network equipment by the TCP/IP Network Interface Module, the voice digital data stream that receives is broken into Ethernet (Ethernet) VoP;
3, whether main control unit is idle by TCP/IP Network Interface Module, the TCP/IP network inquiry callee network equipment; If idle, execution in step 4, otherwise, wait for, till its free time;
4, Ethernet (Ethernet) VoP that will accomplish fluently of main control unit directly is transferred to callee's network equipment by Ethernet (Ethernet) by Ethernet (Ethernet) Network Interface Module;
5, after the main control unit in callee's network equipment will receive the VoP that the calling party transmits by callee's Ethernet (Ethernet) Network Interface Module, unpack, extract audio data stream wherein, it is transferred to voice module in callee's network equipment, converts voice signal to by it and play back;
6, simultaneously, callee's voice module is gathered callee's speech data again, converts thereof into the voice digital data stream signal and passes to the main control unit that is attached thereto by data/address bus;
7, main control unit breaks into Ethernet (Ethernet) VoP with the speech digit stream that receives;
8, Ethernet (Ethernet) VoP that will accomplish fluently of main control unit directly is transferred to calling party's network equipment by Ethernet (Ethernet) through Ethernet (Ethernet) Network Interface Module;
9, the VoP that breaks into the formation of Ethernet (Ethernet) packet that the main control unit in calling party's network equipment will receive unpacks, extract audio data stream wherein, it is transferred to coupled voice module, converts voice signal to by it and play back;
10, constantly repeat said process, until once by finishing.
As shown in Figure 5, method of carrying out real-time voice transmission based on Ethernet (Ethernet) provided by the invention is directly to carry out real-time voice by Ethernet (Ethernet) network link layer to transmit, do not carry any procotol at this layer, link protocol itself that have only, the real-time Transmission of responsible VoP only, so, the present invention does not need complicated voice transfer protocol just can realize the real-time Transmission of speech data, accomplish the voice latency of minimum and stable and controllable, and, do not need extra Echo Cancellation to handle.
As shown in Figure 3, because the system of realization speech data real-time Transmission provided by the invention adopts the design of independent networking, be about to the independent networking of network of real-time voice switching network and transmission request control information, Ethernet (Ethernet) is specifically designed to the transmission and the exchange of real-time voice packet, the TCP/IP net is specifically designed to the request and the control information of each voice-over-net equipment room of transmission, so, the present invention has reduced the complexity of VoP switched call control protocol, do not need to greatly reduce system cost for each voice-over-net equipment disposition extra gateway device and speech compression/decompression processing unit.
In addition, Ethernet (Ethernet) switching equipment (as 10M or 100M or 1000M Ethernet switch) and the plurality of network speech ciphering equipment that the present invention can also be by selecting different size for use and joining select corresponding Network Interface Module make up different scales, autgmentability is strong, flexibly, big capacity, cheap real-time voice switching system; And,, make full use of its data bandwidth and transmit real-time voice by 10M or 100M or 1000M Ethernet (Ethernet) being divided into the mode of several logical channels.
Claims (3)
1. one kind is carried out the real-time voice system for transmitting based on Ethernet, and it is made of the plurality of network speech ciphering equipment, it is characterized in that:
Be formed by connecting by Ethernet and TCP/IP net between each voice-over-net equipment; Ethernet only is used to transmit the real-time voice packet, and it does not carry any procotol; The TCP/IP net is used for the request control information between transmission equipment;
Each voice-over-net equipment is made up of voice module, ethernet network interface module, TCP/IP net Network Interface Module and main control unit; Link to each other transmitting audio data by data/address bus between main control unit and voice module, two Network Interface Modules; Voice-over-net equipment links to each other with Ethernet by the ethernet network interface module, transmission real-time voice packet; Voice-over-net equipment also links to each other by TCP/IP net Network Interface Module and TCP/IP net, be used for and other voice-over-net equipment and other network systems interconnected, the transmission request control information between transmission equipment; Wherein,
Voice module is responsible for collection/broadcast audio data stream; Main control unit is responsible for audio data stream with the voice module collection and is broken into the Ethernet VoP and be transferred to the called network speech ciphering equipment by ethernet network interface module, Ethernet, simultaneously, main control unit is responsible for that also the called network speech ciphering equipment is transmitted the VoP that breaks into the Ethernet data packet form of returning and is unpacked, extract audio data stream wherein, and play back by voice module.
2. method of carrying out real-time voice transmission based on Ethernet, it may further comprise the steps:
A, each the voice-over-net equipment in the voice-transmission system is coupled together by Ethernet and TCP/IP net;
B, the voice module with in each voice-over-net equipment, main control unit and ethernet network interface module, TCP/IP Network Interface Module couple together by internal data bus;
Only transmit the real-time voice packet and do not carry any procotol by Ethernet between C, each voice-over-net equipment, by the request control information between TCP/IP net transmission equipment;
Concrete steps are as follows:
Main control unit in I, each voice-over-net equipment breaks into the Ethernet VoP with the audio data stream of voice module collection, through the ethernet network interface module, directly is transferred to the called network speech ciphering equipment by Ethernet;
Main control unit in II, the called network speech ciphering equipment will unpack by the VoP that breaks into the Ethernet data packet form that the ethernet network interface module receives, extract audio data stream wherein, be transferred to coupled voice module by data/address bus, play back by voice module.
3. a kind of method of carrying out the real-time voice transmission according to claim 2 based on Ethernet, it is characterized in that: described step C further is refined as following steps:
(1), the voice module in the caller voice-over-net equipment gathers calling party's speech data, convert thereof into voice digital data stream and pass to coupled main control unit by data/address bus;
(2), main control unit is according to the callee's number in the audio data stream that receives, utilize the TCP/IP network to seek the target ethernet link layer address of called network equipment by the TCP/IP Network Interface Module, the voice digital data stream that receives is broken into the Ethernet VoP;
(3), whether main control unit is idle by TCP/IP Network Interface Module, the TCP/IP network inquiry callee network equipment; If idle, execution in step (4), otherwise, wait for, till its free time;
(4), the Ethernet VoP that will accomplish fluently of main control unit is by the ethernet network interface module, directly is transferred to callee's network equipment by Ethernet;
(5), after the main control unit in callee's network equipment receives the VoP that the calling party transmits by callee's ethernet network interface module, unpack, extract audio data stream wherein, it is transferred to voice module in callee's network equipment, converts voice signal to by it and play back;
(6), simultaneously, callee's voice module is gathered callee's speech data again, converts thereof into the voice digital data stream signal and passes to the main control unit that is attached thereto by data/address bus;
(7), main control unit breaks into the Ethernet VoP with the speech digit stream that receives;
(8), the Ethernet VoP that will accomplish fluently of main control unit is through the ethernet network interface module, directly is transferred to calling party's network equipment by Ethernet;
(9), the VoP that the Ethernet data bag forms that breaks into that will receive of the main control unit in calling party's network equipment unpacks, and extracts audio data stream wherein, and it is transferred to coupled voice module, convert voice signal to by it and play back;
(10), constantly repeat said process, finish until once conversing.
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| WO2002028025A2 (en) * | 2000-09-26 | 2002-04-04 | Nortel Networks Limited | Network access mechanism and method |
| CN1400804A (en) * | 2001-07-27 | 2003-03-05 | 深圳市中兴通讯股份有限公司上海第二研究所 | Speech transmission method of Ethernet port |
| CN1409548A (en) * | 2002-09-02 | 2003-04-09 | 曹健 | Internet protocol network telephone system and its realizing method |
| CN1595918A (en) * | 2003-10-29 | 2005-03-16 | 深圳市研祥智能科技股份有限公司 | Multifunctional wideband gateway and communication method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5268899A (en) * | 1991-10-17 | 1993-12-07 | 3Com Corporation | Apparatus for generating pseudo-random numbers in a communication system, or other system involving a shared resource |
| WO2002028025A2 (en) * | 2000-09-26 | 2002-04-04 | Nortel Networks Limited | Network access mechanism and method |
| CN1400804A (en) * | 2001-07-27 | 2003-03-05 | 深圳市中兴通讯股份有限公司上海第二研究所 | Speech transmission method of Ethernet port |
| CN1409548A (en) * | 2002-09-02 | 2003-04-09 | 曹健 | Internet protocol network telephone system and its realizing method |
| CN1595918A (en) * | 2003-10-29 | 2005-03-16 | 深圳市研祥智能科技股份有限公司 | Multifunctional wideband gateway and communication method thereof |
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