Automatic phase control circuit used for time base corrector

Details Automatic phase control circuit used for time base corrector Automatic phase control circuit used for time base corrector

H - Electricity

04

N

352/18.31

H04N 9/89 (2006.01) H04N 9/896 (2006.01)

Patent

CA 1250659

ABSTRACT OF THE DISCLOSURE There is disclosed an automatic phase control apparatus for controlling a phase of a phase information signal used for producing an initial address, the initial address being used for writing into or for reading out from a memory circuit of a time base corrector for reducing a time base error included in a reproduced video signal, including a phase shift circuit for shifting the phase of a horizotnal synchronizing pulse, a phase comparator for comparing a phase between the phase shifted horizontal synchronizing pulse and a constant wave signal being in phase with a chroma burst signal and a feedback circuit between the phase comparator and the phase shift circuit for applying a feedback signal in relation to an output signal of the phase comparator to the phase shift circuit so that the phase of the phase information pulse signal is synchronized with the constant wave signal. In this case, the automatic phase control apparatus is characterized by the feedback circuit which includes a capacitor for holding the amplitude of the output signal of the phase comparator, a display circuit connected to the capacitor for indicating the value of the output signal of the phase comparator and a stabilizer circuit connected between the capacitor and a switch circuit for stabilizing the feedback signal so that the value of the feedback signal is approximately zero voltage when the switch circuit is operated.

493282

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