DETECTING SYSTEM OF FRAME SYNCHRONIZING SIGNAL

摘要

PURPOSE:To shorten the frame pull-in time by making use of a block synchronizing signal to detect a frame synchronizing signal. CONSTITUTION:The ''1'' signal which is inserted every (m+1) bits is detected out of a signal train supplied from a terminal 41 through a block synchronizing circuit 3. Then a block synchronizing signal corresponding to the ''1'' signal is outputted. A frame synchronizing circuit 4 detects a frame synchronizing signal by means of the block synchronizing signal sent from the circuit 3.