| 摘要 |
<p>PURPOSE:To provide conventionality and redundancy to the titled circuit by constituting a decision circuit deciding whether or not an extracted signal is a correct frame synchronizing signal, and a counter circuit judging out of frame synchronism of a microprocessor. CONSTITUTION:A data signal from an input terminal 1 is fed to a frame synchronizing signal extraction circuit 4 and a frame synchronizing signal detecting circuit 5 via a serial/parallel converting circuit 3. A CPU circuit 8 decides whether or not the signal extracted by the frame synchronizing signal extracting circuit 4 is a correct frame synchronizing signal, counts its decided output, and judges whether the frame synchronization is established or released depending on the counted result.</p> |
