Digital apparatus for correcting a time-base error in a televisi

Details Digital apparatus for correcting a time-base error in a televisi Digital apparatus for correcting a time-base error in a televisi

1978-09-13

1980-07-22

Fears, Terrell W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 8, H04N 946

Patent

active

042142628

ABSTRACT:
A digital time base corrector for correcting a time-base error in a television video signal, the video signal including a horizontal synchronizing signal and a color burst signal. The start of a write-in clock pulse oscillator is determined by a one-cycle portion of the color burst signal which has been extracted from the video signal in a prefixed phase relationship with the horizontal synchronizing signal. Oscillation frequency control at the write-in clock pulse oscillator is performed in response to the phase deviation of the write-in clock pulse from the extracted one-cycle burst signal portion. Phase-locking of the write-in clock pulse oscillator is performed in response to the phase difference, from the extracted one-cycle burst portion, of a selected one of first and second pulses, the first pulse occurring at the rate of the subcarrier signal and the second pulse occurring at the rate of the horizontal synchronizing pulse. Both pulses are obtained from the write-in clock pulse. The present invention adapts the time-base corrector to allow broader phase fluctuations of the write-in clock pulse with respect to the color burst and the horizontal synchronizing signal of the incoming video signal.

REFERENCES:
patent: 3971063 (1976-07-01), Michael et al.
patent: 3978519 (1976-07-01), Stallet et al.
patent: 4015288 (1977-03-01), Ebihara et al.
patent: 4018990 (1977-04-01), Long et al.
patent: 4024571 (1977-05-01), Dischert et al.
patent: 4062041 (1977-12-01), Tallent et al.
patent: 4127866 (1978-11-01), Yamashita

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