FRAME PATTERN DETECTING CIRCUIT

摘要

PURPOSE:To prevent a pseudo pattern detecting pulse from being generated by inhibiting an output of a detecting circuit for a prescribed time after the generation of a true frame pattern detecting pulse in a transmission system using a Manchester code. CONSTITUTION:A monostable multivibrator 13 generates a pulse for a prescribed time (t) when the multivibrator 13 receives a differentiating pulse of a differentiating circuit 12 in a frame pattern detecting circuit where a different 2TS violation code having consecutive codes is used as a frame synchronism pattern. An output pulse of the monostable multivibrator 13 is applied as an inhibiting input of an inhibiting gate 14 so as to inhibit an output pulse of a flip-flop 11. Thus, the pseudo pattern detecting pulse is blocked and only the true frame pattern detecting pulse is outputted.