TWO-WAY EXAMINING FRAME SYNCHRONIZATION CIRCUIT

摘要

A frame synchronizing circuit which does not cause out-of-synchronism resulting from data disappearance/insertion while suppressing the missynchronization/asynchronization caused by representative code errors of the conventional data transmission system. The frame synchronizing circuit is provided with a frame synchronizing code detecting circuit (32) which detects a frame synchronizing code from a received data sequence, and outputs a frame position and collation results by collating the detected frame synchronizing code with a correct frame synchronizing code, and a data disappearance and data-insertion section judging circuit (54) which judges whether or not data disappearance or data is inserted in the received data sequence based on the collation results.