CN1541480A - 无线传输系统 - Google Patents

无线传输系统 Download PDF

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Publication number
CN1541480A
CN1541480A CNA018073247A CN01807324A CN1541480A CN 1541480 A CN1541480 A CN 1541480A CN A018073247 A CNA018073247 A CN A018073247A CN 01807324 A CN01807324 A CN 01807324A CN 1541480 A CN1541480 A CN 1541480A
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signal
standard
dvcpro
compression
video
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N��J����ķ
N·J·达姆斯特拉
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • 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
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/2187—Live feed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • 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
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Television Signal Processing For Recording (AREA)
  • Studio Devices (AREA)

Abstract

本发明涉及一种数字视频与/或音频传输系统。为了改善这种系统，本发明提出使用所谓的DVCPRO标准进行压缩/解压(直到错误校正)，并使用所谓的COFDM标准进行调制/解调。DVCPRO压缩/解压在传输链中增加非常小的延迟，并提供非常合适的视频质量。此外，COFDM对于多路传输非常健壮，并且只要考虑到最大位错误率，便不会降低图像质量。此外，使用这种组合不是显而易见的，因为DVCPRO标准主要用于磁带的优化。

Description

无线传输系统
本发明涉及一种用于传输来自摄像机的视频与/或音频信号的无线传输系统。
本发明还涉及一种用于这种无线传输系统中的接收机。
本发明还涉及一种用于传输来自摄像机的视频/或音频信号的方法。
由GB-A-2332124得知一种数字射频通信系统，其具有在多个射频载波上向多个接收天线传输错误保护数字数据的移动发送机。所述接收天线和要被组合以便产生输出信号的累加装置相连。把所述输出信号提供给多载波接收机，用于译码原始的数字数据。
这种已知的射频通信系统只能用于无线传输，并因而不能用于数字视频的传输。
本发明的目的在于获得一种用于视频与/或音频信号的无线数字传输的无线传输系统。将会认识到传输数字视频信号比现有技术中所述的传输射频信号具有高得多的需求。
本发明的第一方面提供一种包括权利要求1的特征的无线传输系统。本发明的第二方面提供一种包括权利要求5的特征的用于传输视频与/或音频信号的方法。
本发明基于这样的认识：通过组合用于压缩和解压的所谓的DVCPRO(digital video compression professional数字视频压缩专业)标准，并通过使用用于调制和解调的所谓的COFDM(codedorthogonal frequency division multiplexing编码正交频分多路复用)标准，可以获得一种非常优异的无线传输系统。参见欧洲标准ETSIEN300744和SMPTE307M-1998 Television Digital Recording(TapeCassette)。
DVCPRO压缩/解压在传输链中增加一个非常小的延迟，并提供非常合理的视频质量。此外，COFDM对于多通路传输是非常健壮的，并且只要考虑最大位错误率，就不会引起图像质量的损失。此外，使用这个组合不是显而易见的，因为DVCPRO标准主要用于磁带的优化。
从属权利要求中限定了本发明的实施例。
本发明的这些和其它的方面借助于下面说明的例子进行说明。其中的附图表示：
按照本发明的无线传输系统的示意的方块图。
附图示意地表示按照本发明的无线传输系统。在输入Iv和Ia，系统WTS分别接收视频信号和音频信号。这两个输入信号利用所谓的DVCPRO标准压缩，借以进行压缩，直到附加错误校正位为止。错误校正位不按照COFDM标准进行压缩，因为这些错误校正用于磁带存储是最佳的，而用于无线传输则不是最佳的。
在压缩之后可以利用的这个数据流被分裂，借以除去空白和额外消耗。这产生实数据和帧信息。通过删除所述空白和额外消耗，可以使数据速率保持尽可能低。
把实数据内容提供给重新排列单元，以便把数据重新排列成MPEG结构。MPEG包被分裂成两个数据流，并把这两个数据流提供给调制单元，用于按照COFDM标准调制。在调制之后，无线传输系统包括用于使信号准备通过天线ANT1传输的RF部分。
无线传输系统的接收机REC也包括天线ANT2，所述天线接收由发送机TRA发送的信号。在接收机中，所述信号被提供给也包括RF部分的解调单元。
解调也按照COFDM标准进行。所得的两个数据流在组合器COMB中组合成一个由MPEG包构成的数据流。
把所述数据流提供给分离单元SEP2，从MPEG结构中取出实DVCPRO数据、帧信息和辅助数据。所述分离单元和再生单元REG相连，所述再生单元用于由实数据和帧信息再生DVCPRO压缩的数据流。
再生单元和解压单元DECOMP相连，所述解压单元用于解压DVCPRO信号，从而在输出0v和0a分别获得视频输出和音频输出信号。
例如MPEG传输流结构具有下面的结构47HEX(包头)：
帧开始指示(1字节)
包计数器(1字节)
在该包中的DVCPRO字节数(1字节)
在该包中的辅助数据数(1字节)
DVCPRO数据字节
辅助数据字节
填充字节
在本例中的字节总数总是188。
辅助数据例如可以是用户的特定控制信号，用于通过无线传输控制摄像机与/或其它装置。包计数器可以用于分裂例如14.4兆位/秒的两个数据流中的包。通过分裂这些数据流，以便在DVB-T标准之间选择选项，用于进行健壮的传输。
在接收机侧，由DVB调制器得出的两个MPEG数据流按照正确的顺序被提供和组合，并接着分离MPEG结构。这得到实DVCPRO数据内容、(视频和音频)、要用作同步和辅助数据的帧信息的可用性。
根据DVCPRO数据内容和帧信息，DVCPRO解压信号被再生，并被提供给DVCPRO解压，此后，可以得到视频和音频信号。
本领域的技术人员应当理解，在本发明的范围内还有许多改型。本发明的主要构思是使用DVCPRO标准用于压缩和解压(直到错误校正，在这个标准中错误校正对于磁带应用是特定的)，并使用COFDM标准用于调制/解调。

Claims (5)

1.一种用于传输至少一台摄像机的视频与/或音频信号的无线传输系统，包括发送机，所述发送机具有用于压缩输入信号的压缩装置，用于调制解压的信号的调制装置，和与一个第一天线相连的RF单元，具有第二天线的接收机，第二RF单元，用于解调接收的信号的解调装置，用于解压解调的信号的解压装置，其中压缩/解压装置使用DVCPRO标准，调制/解调装置使用COFDM标准。
2.如权利要求1所述的无线传输系统，其特征在于，所述摄像机包括发送机。
3.一种用于权利要求1所述的无线传输系统的发送机。
4.一种用于权利要求1所述的无线传输系统的接收机。
5.一种用于传输摄像机的视频/音频信号的方法，包括以下步骤：压缩接收的信号；调制压缩的信号；发送调制的信号；接收发送的信号；解调接收的信号；解压解调的信号，其中按照DVCPRO标准进行所述压缩/解压，并按照COFDM标准进行所述调制/解调。
CNA018073247A 2001-01-30 2001-12-21 无线传输系统 Pending CN1541480A (zh)

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EP01200319 2001-01-30
EP01200319.0 2001-01-30

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US (1) US20020101545A1 (zh)
EP (1) EP1413079A2 (zh)
JP (1) JP2004525555A (zh)
KR (1) KR20020087945A (zh)
CN (1) CN1541480A (zh)
WO (1) WO2002061997A2 (zh)

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Publication number Priority date Publication date Assignee Title
FR2849566B1 (fr) * 2002-12-27 2005-04-08 Avenir Numeric S Dispositif de transmission radio numerique de donnees incluant des informations video
US20050008155A1 (en) * 2003-07-08 2005-01-13 Pacific Microwave Research, Inc. Secure digital transmitter and method of operation
US20050122914A1 (en) * 2003-07-08 2005-06-09 Pacific Microwave Research, Inc. Secure Digital Communication System for High Multi-Path Environments
KR100971904B1 (ko) * 2009-01-13 2010-07-22 한국철도기술연구원 전처리모듈을 이용하여 광대역 이더넷 데이터 및 영상 데이터를 송수신하기 위한 데이터 송수신장치 및 데이터 송수신방법
US9900576B2 (en) 2013-03-18 2018-02-20 Qualcomm Incorporated Simplifications on disparity vector derivation and motion vector prediction in 3D video coding

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US5568205A (en) * 1993-07-26 1996-10-22 Telex Communications, Inc. Camera mounted wireless audio/video transmitter system
JP2802254B2 (ja) * 1996-01-10 1998-09-24 株式会社次世代デジタルテレビジョン放送システム研究所 Ｏｆｄｍシステムとｏｆｄｍ装置

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WO2002061997A2 (en) 2002-08-08
KR20020087945A (ko) 2002-11-23
JP2004525555A (ja) 2004-08-19
US20020101545A1 (en) 2002-08-01
EP1413079A2 (en) 2004-04-28
WO2002061997A3 (en) 2004-02-12

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