And device synchronization method for improving the stability of the audio / video signal in the digital recording equipment

摘要

Video signal is converted into a stream of digital numbers that are configured in a sequence of digital video frames (14). Adjacent frames are separated by (16) synchronization signal. Monitors the synchronization signal detection circuit (30) detects the loss of synchronization signal. Generating an alternate synchronization signal on the basis of the sync signal is monitored (32) clock generator. The alternative signal having an average frequency synchronization, it is possible to replace the synchronization signal for all, or may be replaced by a synchronization signal collapsed or disappeared. Alternate synchronization signal may be inserted are generated by one of the clock rate or the actual fixed rate. In a preferred embodiment, the learning circuit (42) to collect the average clock rate of the synchronization signal for a predetermined period of time. Its value is supplied to the clock generator, I want to output the alternate synchronization signal at a clock rate of actual. Compression circuit (20) is clocked by the output of the clock generator.