视听系统中的帧同步控制和指示信号 |
通过传输系统提供数字音视频业务,其中相关信号在数字路径上采用ITU-T H.221建议书规定的帧架构进行复用。除音频,视频、用户数据和远程信息处理的信息外,这些信号还包括用于系统正常工作的信息。额外信息被称为控制和指示(C&I),以反映尽管一些比特确实用于“控制”导致系统别的地方出现状态变化,但其他向用户提供系统如何工作的指示这一事实。ITU-T H.230建议书仅涉及这些C&I,它们必须是传输帧同步,否则则要求快速响应。本建议书详细介绍了与视频和音频、传输数字和字符的方法有关的C&I;用于维护目的的C&I;MLP信道中未采用协议的简单多点会议的C&I;用于信道聚合的C&I;用于传送网络地址的C&I。代码点表还说明了各种功能为强制或可选的不同情况。 ITU-T H.230建议书的本次修订引入了多项对原版本的改进和澄清,主要是对C&I符号的定义。 |
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Citation: |
https://handle.itu.int/11.1002/1000/13901 |
Series title: |
H series: Audiovisual and multimedia systems H.200-H.499: Infrastructure of audiovisual services H.230-H.239: Systems aspects |
Approval date: |
2019-05-14 |
Approval process: | AAP |
Status: |
In force |
Maintenance responsibility: |
ITU-T Study Group 16 |
Further details: |
Patent statement(s)
Development history
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ITU-T Supplement
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Title
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Status
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Summary
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Table of contents
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Download
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H Suppl. 6 (04/2006)
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Control load quantum for decomposed gateways
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In force
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here
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here
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here
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H Suppl. 9 (05/2008)
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Gateway control protocol: Operation of H.248 with H.225.0, SIP, and ISUP in support of emergency telecommunications service (ETS)/international emergency preference scheme (IEPS)
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In force
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here
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here
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here
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H Suppl. 11 (02/2009)
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Analysis of class-based home network QoS solutions
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In force
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here
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here
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here
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H Suppl. 12 (11/2013)
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Gateway control protocol: Priority traffic treatment by ITU-T H.248 gateways
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In force
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here
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here
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here
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H Suppl. 13 (10/2015)
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Gateway control protocol: Common ITU-T H.248 terminology - Release 2
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In force
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here
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here
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here
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H Suppl. 14 (10/2015)
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Gateway control protocol: SDP codepoints for gateway control - Release 2
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In force
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here
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here
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here
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H Suppl. 15 (01/2017)
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Conversion and coding practices for HDR/WCG Y'CbCr 4:2:0 video with PQ transfer characteristics
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In force
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here
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here
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here
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H Suppl. 17 (11/2014)
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Guide for addressing accessibility in standards
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In force
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here
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here
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here
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H Suppl. 18 (10/2017)
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Signalling, backward compatibility and display adaptation for HDR/WCG video coding
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In force
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here
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here
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here
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H Suppl. 19 (04/2021)
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Usage of video signal type code points
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In force
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here
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here
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here
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Title |
Approved on |
Download |
Testing of personal audio systems for compliance with ITU-T H.870 (2018)
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2024
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Testing of personal audio systems for compliance with ITU-T H.870 (2018)
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2021
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here
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Telecommunications Accessibility Checklist
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2006
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here
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Security in Telecommunications and Information Technology
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2004
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here
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Security in Telecommunications and Information Technology
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2003
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here
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