CN100413346C - 多媒体多路复用方法 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
- H04J3/0611—PN codes
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- H—ELECTRICITY
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- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
- H04L65/1106—Call signalling protocols; H.323 and related
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/24—Systems for the transmission of television signals using pulse code modulation
- H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
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Abstract
提供了一种用于多媒体通信的多路复用方法,通过改变多路复用协议数据单元(MUX-PDU)的首标,与H.223协议兼容。该多路复用方法包括以下步骤:(a)编码媒体数据;和以预定帧为单位多路复用在步骤(a)中编码的媒体数据,在有帧的开始和结束的第一标志(140)之后,在帧中插入具有预定长度并具有自相关度的第二标志(150)。因而,通过将具有高自相关度的标志(150)加到H.223 MUX-PDU帧,增加了由接收器检测MUX-PDU的可能性,从而提高了差错复原能力。
Description
本申请是申请日为1998年5月22日、申请号为98806556.8、题为“多媒体多路复用方法”的专利申请的分案申请。
技术领域
本发明涉及多媒体通信的多路复用方法,尤其涉及通过改变多路复用协议数据单元(MUXPDU)的首标,与H.223协议兼容的多路复用方法。
背景技术
总的来说,H.324建议规定了在诸如无线信道的易错信道中有效的视频和音频信号的多路复用,包括H.223多路复用、H.245控制、H.263视频CODEC和G.723.1音频CODEC。同样,H.223多路复用被推荐为在协议数据单元(PDU)中多路复用视频、音频和其它数据的方法,以便通过ITU-T(国际电信联盟的电信标准化分会)在全数字电信网络上实现视频通话和视频会议。同样,H.324建议包括具有高复杂性的模式(Mode)1和没有复杂性的模式3。根据模式1,在产生可变长度分组的同时,通过在作为上层的适配层采用速率兼容收缩卷积(RCPC,rate compatible punctured convolutional)编码器/解码器(CODEC),执行不均匀差错保护(UEP)。同样,使用自动重发请求(ARQ)以便保持整个服务品质(QOS),即使信道通过量降低。然而,模式1在RCPC CODEC部分具有高的复杂性,增加了整个系统的复杂性。这样,实现实时处理很困难。同样,由于其采用重发方法,系统的总信道通过量可能迅速降低。例如,当重发执行一次时,信道通过量为50%或更少,当重发执行两次时,信道通过量为33%或更少。这样,在H.324的模式1中实现与传统的H.223相兼容的代码转换是困难的。同时,模式3实质上没有差错保护概念,这样在易错信道中的差错复原能力非常低。
本发明的公开
本发明的目的是提供一种多媒体通信的多路复用方法,通过由H.223协议在多路复用协议数据单元(MUX-PDU)中的高电平数据链路控制(HDLC)的标志(flag)之后加入类似于伪噪声码(PN CODE)的标志,使得能够用H.223协议进行代码转换。
为了实现该目的,提供了一种在H.223协议中用于多媒体通信的多路复用方法,包括以下步骤:(a)编码媒体数据;和(b)以预定帧为单位多路复用在步骤(a)中编码的所述媒体数据,在有所述帧的开始和结束的第一标志之后,在帧中插入具有预定长度并具有自相关度的第二标志。
最好,步骤(b)的第二标志具有“10110010”的位组合。
附图的简要说明
图1是根据本发明实现与H.223协议兼容的多媒体通信的多路复用方法的设备的示意方框图;
图2A是示出通常的H.223MUX-PDC帧的结构的图;
图2B是示出根据本发明的H.223MUX-PDC帧的结构的图;
图3A是示出在填充模式中的H.223MUX-PDC帧的结构的图;和
图3B是示出在故障消息模式中的H.223MUX-PDC帧的结构的图。
实现本发明的最佳模式
在示出用于根据本发明实现用于多媒体通信的H.223多路复用方法的设备的图1中,多路复用部分130包括H.223协议单元110和代码转换器120。H.223协议单元110和代码转换器120对编码的媒体数据(视频、音频和其它数据)执行多路复用,通过协议数据单元(未示出)以发送到一信道。
图2是示出通常的H.223MUX-PDC帧的结构的图。
如图2A所示,H.223MUX-PDC以帧为单位构成,该帧包括:高电平数据链路控制(HDLC)标志10,用于发送控制;首标20,包括数据信息;和净负荷30,包括视频和音频数据。
使用图2A的HDLC标志10来定义H.223的所有MUX-PDC。HDLC标志10具有唯一的位组合“01111110”,它有六个连续的“1”,代表帧的开始或结束,用于帧的同步。
图2B是示出根据本发明的H.223MUX-PDC帧的结构的图。MUX-PDC帧包括HDLC标志140、额外标志150、首标160和净负荷170。代码转换器120接着HDLC标志140插入8位额外标志150,该标志150类似于伪噪声码(PN CODE),具有高的自相关度,如图2B所示。这里,选择具有“10110010”位组合的额外标志的原因是由于其如PN CODE的高自相关度。因此,仅有“10110010”的位组合可以作为额外标志150被加入,或者其它具有高自相关度的位流可以被用于增加差错复原。同样,考虑到与信道带宽的折衷,可以加入更长的标志。最好是如本发明所建议的,防止在填充模式中或者故障消息模式中加入额外标志,在填充模式中,HDLC标志连续存在,如图3A所示,在故障消息模式中没有净负荷,如图3B所示。
根据本发明的多媒体通信的多路复用方法不限于所述的特定形式,对本领域技术人员来说,可进行进一步的修改和替换。即,通过使用多个MUX-PDU的每个额外标志,可以执行交织和RCPC处理。
工业实用性
如上所述,在根据本发明的多媒体通信的多路复用方法中,包括具有高自相关度的额外标志的MUX-PDU在H.223协议中发送,增加了由接收器检测MUX-PDU的可能性。这样,也增加了差错复原能力。同样,当与RCPC和交织方法一起使用该多路复用方法时,可以进一步增加差错复原能力。
Claims (6)
1. 一种在H.223协议中用于多媒体通信的多路复用方法,包括以下步骤:
(a)编码媒体数据;和
(b)以预定帧为单位多路复用在步骤(a)中编码的所述媒体数据,并且向表示帧的开始或结束的8位同步码增加8位伪噪声同步码。
2. 一种在H.223协议中用于多媒体通信的多路复用方法,包括以下步骤:
(a)编码媒体数据;和
(b)以预定帧为单位多路复用在步骤(a)中编码的所述媒体数据,并且将具有所述帧的开始或结束的8位同步码之后,在帧中插入具有预定长度并具有自相关度的额外标志。
3. 如权利要求2所述的多路复用方法,其中所述帧还包括:
具有数据信息的首标;和
具有视频和音频数据的净负荷。
4. 如权利要求2所述的多路复用方法,其中步骤(b)的所述额外标志有“10110010”的位组合。
5. 如权利要求2所述的多路复用方法,其中步骤(b)的所述额外标志是伪噪声码。
6. 如权利要求2所述的多路复用方法,其中当所述帧中连续存在多个所述8位同步码或没有净负荷时,防止在所述帧中插入所述额外标志。
Applications Claiming Priority (2)
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US08/884,630 | 1997-06-27 | ||
US08/884,630 US6529528B1 (en) | 1997-06-27 | 1997-06-27 | Multimedia multiplexing method |
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CNB988065568A Division CN1159925C (zh) | 1997-06-27 | 1998-05-22 | 多媒体多路复用方法 |
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CN100413346C true CN100413346C (zh) | 2008-08-20 |
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CNB988065568A Expired - Lifetime CN1159925C (zh) | 1997-06-27 | 1998-05-22 | 多媒体多路复用方法 |
CNB031081975A Expired - Lifetime CN100413346C (zh) | 1997-06-27 | 1998-05-22 | 多媒体多路复用方法 |
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US (2) | US6529528B1 (zh) |
EP (1) | EP1023808B1 (zh) |
JP (2) | JP3342704B2 (zh) |
KR (1) | KR100332327B1 (zh) |
CN (2) | CN1159925C (zh) |
AT (1) | ATE398891T1 (zh) |
AU (1) | AU723813B2 (zh) |
BR (1) | BR9811098B1 (zh) |
CA (1) | CA2295148C (zh) |
DE (1) | DE19882497B4 (zh) |
ES (1) | ES2155042B1 (zh) |
GB (1) | GB2341775B (zh) |
RU (1) | RU2190307C2 (zh) |
WO (1) | WO1999000988A1 (zh) |
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- 1998-05-22 AU AU74566/98A patent/AU723813B2/en not_active Expired
- 1998-05-22 RU RU99127319/09A patent/RU2190307C2/ru active
- 1998-05-22 CN CNB988065568A patent/CN1159925C/zh not_active Expired - Lifetime
- 1998-05-22 EP EP98921910A patent/EP1023808B1/en not_active Expired - Lifetime
- 1998-05-22 ES ES009950085A patent/ES2155042B1/es not_active Expired - Fee Related
- 1998-05-22 DE DE19882497T patent/DE19882497B4/de not_active Expired - Lifetime
- 1998-05-22 GB GB9930303A patent/GB2341775B/en not_active Expired - Lifetime
- 1998-05-22 KR KR1019997012105A patent/KR100332327B1/ko not_active IP Right Cessation
- 1998-05-22 CA CA002295148A patent/CA2295148C/en not_active Expired - Lifetime
- 1998-05-22 CN CNB031081975A patent/CN100413346C/zh not_active Expired - Lifetime
- 1998-05-22 BR BRPI9811098-5B1A patent/BR9811098B1/pt not_active IP Right Cessation
- 1998-05-22 WO PCT/KR1998/000129 patent/WO1999000988A1/en active IP Right Grant
- 1998-05-22 AT AT98921910T patent/ATE398891T1/de not_active IP Right Cessation
- 1998-05-22 JP JP50546099A patent/JP3342704B2/ja not_active Expired - Lifetime
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2001
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GB2341775A (en) | 2000-03-22 |
US6529528B1 (en) | 2003-03-04 |
GB9930303D0 (en) | 2000-02-09 |
AU7456698A (en) | 1999-01-19 |
CN1159925C (zh) | 2004-07-28 |
JP3342704B2 (ja) | 2002-11-11 |
EP1023808A1 (en) | 2000-08-02 |
JP2000513917A (ja) | 2000-10-17 |
ES2155042B1 (es) | 2001-12-16 |
BR9811098B1 (pt) | 2013-12-31 |
CA2295148A1 (en) | 1999-01-07 |
ES2155042A1 (es) | 2001-04-16 |
KR100332327B1 (ko) | 2002-04-12 |
CA2295148C (en) | 2003-07-08 |
JP3524078B2 (ja) | 2004-04-26 |
BR9811098A (pt) | 2000-07-18 |
CN1261501A (zh) | 2000-07-26 |
US20010038650A1 (en) | 2001-11-08 |
EP1023808B1 (en) | 2008-06-18 |
AU723813B2 (en) | 2000-09-07 |
WO1999000988A1 (en) | 1999-01-07 |
JP2002084246A (ja) | 2002-03-22 |
DE19882497B4 (de) | 2005-10-27 |
KR20010014069A (ko) | 2001-02-26 |
DE19882497T1 (de) | 2000-09-07 |
US7173946B2 (en) | 2007-02-06 |
ATE398891T1 (de) | 2008-07-15 |
CN1520190A (zh) | 2004-08-11 |
RU2190307C2 (ru) | 2002-09-27 |
GB2341775B (en) | 2003-03-26 |
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