G - Physics – 11 – B
Patent
G - Physics
11
B
352/18
G11B 5/008 (2006.01) H04N 9/82 (2006.01) H04N 9/84 (2006.01) H04N 9/893 (2006.01)
Patent
CA 2036475
In accordance with one aspect of the invention, there is provided a time difference correction circuit for correcting time differences between luminance and chrominance signals derived from a detected signal from a videotape. The circuit includes a luminance signal detecting circuit, a chrominance signal detecting circuit, a mixing circuit, a vertical synchronization circuit and a timing control circuit. The luminance signal detection circuit extracts a luminance signal from the detected signal. The chrominance signal detection circuit extracts a chrominance signal from the detected signal and includes a controllable delay line for delaying the chrominance signal by a controllable amount of time to produce a time difference corrected chrominance signal. The mixing circuit mixes the luminance signal and the time difference corrected chrominance signal to produce a composite video output signal. The vertical synchronization circuit detects a vertical synchronization signal in the luminance signal and delays the vertical synchronization signal to produce a delayed vertical synchronization signal. The timing control circuit determines a time difference between the luminance and chrominance signals for each field in a horizontal interval, in response to the delayed vertical synchronization signal and outputs a control signal to the controllable delay line, the control signal corresponding to the time difference between the luminance signal and the chrominance signal. The delay produced by the time delay is varied to correct the time difference.
Bull Housser & Tupper Llp
Goldstar Co. Ltd.
LandOfFree
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