Phase locking system for television signals

Details Phase locking system for television signals Phase locking system for television signals

H - Electricity

04

N

350/38, 352/18.3

H04N 5/782 (2006.01) H04N 9/896 (2006.01)

Patent

CA 1135399

Abstract of the Disclosure A phase locking system for a video tape recorder/player is disclosed in which a freely reproduced video signal (containing a time-base error) from the VTR is phase-locked to a reference signal provided by a time base corrector. The freely reproduced video signal is coded into a digitized video signal in response to a first clock pulse train, which is produced from the synchronizing signal and/or the color burst signal contained in the freely reproduced video signal. The digitized signal is supplied through a first delay circuit or directly to a memory having a memory capacity of at least one field of the digitized signal, A writing of the digitized signal in the first memory is controlled by a write-in address signal, which is pro- duced from the first clock pulse grain and the synchronizing signal by a write-in address signal generator. The synchronizing signal is supplied through a second delay identical to the first delay in delay time or directly to the write-in address signal generator in response to whether the digitized signal is passed through the first delay. A selection between passage of the digitized signal and the synchronizing signal through the delay circuits and direct passage of these signals is controlled in response to the phase difference between the synchronizing signals contained in the freely repro- duced signal and the reference signal. The digitized signal stored in the memory is read out in response to a read-out address signal, which is pro- duced from the reference signal.

322984

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