Time base error correcting apparatus

Details Time base error correcting apparatus Time base error correcting apparatus

H - Electricity

04

N

350/38, 352/18.3

H04N 9/00 (2006.01) H04N 9/84 (2006.01) H04N 9/898 (2006.01)

Patent

CA 1113182

ABSTRACT OF THE DISCLOSURE 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.

290575

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