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1. 发明授权

US06260193B1 Synchronization of decoders in a bi-directional CATV network 失效
标题翻译：解码器在双向CATV网络中的同步
公开(公告)号：US06260193B1
公开(公告)日：2001-07-10
申请号：US09021006
申请日：1998-02-09
申请人： Kevin T. Chang , David E. Chodelka , Charles E. Schell, III , Sam Reichgott
发明人： Kevin T. Chang , David E. Chodelka , Charles E. Schell, III , Sam Reichgott
IPC分类号： H04N7173
CPC分类号： H04N21/44209 , H04N7/084 , H04N7/088 , H04N7/17309 , H04N21/2221 , H04N21/242 , H04N21/4384 , H04N21/6118 , H04N21/6168 , H04N21/6581
摘要： A system for synchronizing one or more decoders with a network sync signal at a headend of a television communication network. The system allows decoders to transmit upstream messages synchronously in time slots which are defined according to the network sync signal, thereby improving system throughput. Identifying data is provided in a blanking interval (VBI or HBI) of one or more television signals to designate a horizontal scan line of the respective television signal which follows a reference point in the network sync signal by a predetermined delay. At each decoder, the identifying data is recovered, and the onset of the designated scan line can be used to signal the start of a transmission for the decoder. Preferably, the identifying data is provided in each television signal so the user is not forced to tune to a particular television channel to transmit a message. Various channel access protocols may be used, such as a session oriented protocol, or a synchronized ALOHA protocol.
摘要翻译：一种用于在电视通信网络的前端同步一个或多个解码器与网络同步信号的系统。系统允许解码器在根据网络同步信号定义的时隙中同步传输上行消息，从而提高系统吞吐量。在一个或多个电视信号的消隐间隔（VBI或HBI）中提供识别数据，以指定在网络同步信号中的参考点之后预定延迟的相应电视信号的水平扫描线。在每个解码器处，识别数据被恢复，并且可以使用指定的扫描线的开始来通知解码器的传输开始。优选地，在每个电视信号中提供识别数据，使得用户不被强制调谐到特定电视频道以发送消息。可以使用各种信道接入协议，例如面向会话的协议或者同步的ALOHA协议。

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