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1. 发明授权

US4271520A Synchronizing technique for an error correcting digital transmission system 失效
标题翻译：用于纠错数字传输系统的同步技术
公开(公告)号：US4271520A
公开(公告)日：1981-06-02
申请号：US51938
申请日：1979-06-25
申请人： Daniel J. Coombes , John H. Sangster
发明人： Daniel J. Coombes , John H. Sangster
IPC分类号： H04L1/00 , H04L7/04 , G06F11/10 , H04L7/02
CPC分类号： H04L1/0057 , H04L7/048
摘要： The instant invention resides in a system, including an encoder and a decoder, for the transmission and retrieval of digital data over a transmission medium. The encoder includes an error correction encoding scheme which processes the data and produces an encoded bit stream including data and parity bits in either an interspersed or blocked relationship. A transmission bit stream is generated by modulo-2 adding the encoded bit stream with a predetermined sync sequence, which sync sequence is selected to provide optimum sync detection at the decoder site.The encoder modulo-2 subtracts said sync sequence from the received transmission stream, thereby producing a resultant which is monitored by an error correction detector. The detector produces an in- or out-of-synchronization indication as determined by the number of resultant bit stream detected errors.
摘要翻译：本发明在于包括用于通过传输介质传输和检索数字数据的编码器和解码器的系统。编码器包括纠错编码方案，其处理数据并产生包含散布或阻塞关系中的数据和奇偶校验位的编码比特流。传输比特流通过模2加上具有预定同步序列的编码比特流来生成，该同步序列被选择以在解码器位置提供最佳同步检测。编码器模2从接收到的传输流中减去所述同步序列，从而产生由纠错检测器监视的结果。检测器产生由所得到的比特流检测到的错误的数量确定的进入或者不同步的指示。

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