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Abstract

A digital video synchronizer for providing parallel and coordinated synchronization paths for decoded and undecoded video. Processing is added for a parallel path in a synchronization memory that bypasses the comb filter and video decoder circuitry to allow a digitized composite video to pass through unchanged. This parallel path is coordinated with the decoder path to provide features of both a composite video synchronizer and a digital component decoder/synchronizer with time base corrector. A digital encoder transforms component video back into modulated composite video. The digital encoder generates a synchronizing and color burst signal to replace the sync and burst signals of the composite video signal. The synchronized composite and synchronized encoded signals are adjusted in timing, gain and DC offset to match one another so that the signals can be faded, mixed, or multiplexed without detectable differences. A multiplexer switches between the encoded version of the video signal and the undecoded version.

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First Claim