Television horizontal afpc with phase detector driven at...

Details Television horizontal afpc with phase detector driven at... Television horizontal afpc with phase detector driven at...

H - Electricity

04

N

350/88

H04N 5/08 (2006.01) H04N 5/05 (2006.01) H04N 5/12 (2006.01)

Patent

CA 1143830

- 22 - RCA 73,476 ABSTRACT OF THE DISCLOSURE An AFPC loop for a TV horizontal oscillator suitable for use with synchronizing signals subject to timing instability includes a switchable time constant filter coupled between the loop phase detector output and the horizontal oscillator input. Timing means coupled to the horizontal oscillator output provides timing signals to a selecting means which is coupled to a time constant control input terminal of the filter for selecting a first predetermined time constant value for the filter in response to a first timing signal at a time which occurs within one horizontal line rate period of a plurality of successive ones of horizontal rate synchronizing signals, and for selecting a second predetermined time constant value for the filter in response to a second timing signal at a time which occurs subsequent to the aforementioned plurality of successive horizontal rate synchronizing signals and prior to the end of the vertical blanking interval.

351682

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