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同步问题是数字通信中的重要问题之一,帧同步器性能的好坏对传输数据质量的影响很大。全数字化的帧同步器线路简单,调试比较方便,性能比较可靠。本帧同步器所在的传输系统共有八路,其中第0路传送的是作为群同步码组的11位巴克码(11100010010)和1位缓变信号,第1路至第7路传送数据,码速率为4.8kbit/s。本帧同步器主要由巴克码识别器、群同步保护线路等组成(如图1所示)。巴克码识别器主要由移位寄存器和全加器组成。
Synchronization is one of the most important problems in digital communication. The performance of the frame synchronizer has a great influence on the quality of the transmitted data. Fully digital frame synchronization line simple, more convenient debugging, more reliable performance. The frame synchronizer is located in the transmission system there are eight, including the first 0 is transmitted as a group of sync code group 11 Barker code (11100010010) and 1 bit slow change signal, the first 1 to 7 transmission data, the code rate 4.8kbit / s. The frame synchronizer mainly by the Barker code recognizer, group synchronization protection lines (Figure 1). Barker code recognizer is mainly composed of shift register and full adder.