Time base error correcting apparatus

Details Time base error correcting apparatus Time base error correcting apparatus

1977-11-14

1980-06-17

Konick, Bernard

Facsimile and static presentation processing

Static presentation processing

Attribute control

360 36, H04N 576

Patent

active

042086744

ABSTRACT:
In apparatus for processing an information signal, such as, the chrominance component of a reproduced color video signal, time base errors composed of phase and frequency errors are eliminated by detecting phase and frequency errors, respectively, of the chrominance component, frequency converting the chrominance component with a frequency converting signal which is generated, at least in part, by means of a variable frequency oscillator, controlling such oscillator by an automatic phase control circuit (APC) in response to detected phase errors within a predetermined or lock-in range of the APC so as to eliminate such phase errors from the frequency converted chrominance component, and further controlling the variable frequency oscillator in response to only those detected frequency errors which correspond to time base errors beyond the lock-in range of the APC for returning to within such range.

REFERENCES:
patent: 3499984 (1970-03-01), Inoue
patent: 3528026 (1970-09-01), Groendycke
patent: 3637936 (1972-01-01), Krause
patent: 3939485 (1976-02-01), Amari
patent: 3953882 (1976-04-01), Arimura
patent: 4012774 (1977-03-01), Kuniyoshi
patent: 4069462 (1978-01-01), Dunn
"Digital Time-Base Correction for Video Signal Processing", by Acker & McLean, SMPTE Journal, Mar., 1976, vol. 85, pp. 146-150.

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