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一、概述在数字化地震遥测系统中,数字信息在信道中都是串行传送的。为了在收端正确识别并分离各路数码,要求在系统中设置同步检测电路。系统建立同步传输,是在发端数码流中插入一组特定的数码,收端则根据这组数码的特征正确识别,并由此建立同步,然后再实现各路数码的分离。现有的帧同步电路几乎都是用硬逻辑电路实现的。由于经过信道传输的数字难免会出现误码,以及数码流中也可能出现与帧同步码组相同的码字等情
I. Overview In the digital seismic telemetry system, digital information is transmitted serially in the channel. In order to correctly identify and close the end of the digital road, requires the establishment of synchronous detection circuit in the system. System to establish synchronous transmission, is to insert a specific set of digital in the sending digital stream, the receiving end is correctly identified according to the characteristics of this set of digital, and thus establish synchronization, and then realize the separation of the digital road. Almost all existing frame synchronization circuits are realized by hard logic circuits. Because the number of channel transmission will inevitably be bit error, and the digital stream may also appear with the same frame sync code group code and other conditions