Rahmen-Synchronisierungsanordnung

摘要

The decoder produces output containing a detectable signal component equal to one-half the frame repetition rate when an out of sync condition is present. A bandpass filter detects the signal component and produces a pulse which is inserted into the bit clock from which the frame clock is derived for operating the decoder. The frame clock is shifted one bit each frame until a sync condition is achieved and the signal component disappears. A feedback circuit inhibiting the filter output is provided to prevent for a given time interval generating a succession of additional pulses after the first extra pulse is inserted into the bit clock.