Digital signal phase measuring apparatus as for a phase-locked l

Details Digital signal phase measuring apparatus as for a phase-locked l Digital signal phase measuring apparatus as for a phase-locked l

1983-09-19

1985-09-24

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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375119, 377 43, H04N 946

Patent

active

045436002

ABSTRACT:
A phase measuring arrangement for sampled signals changes the phase of the sampling signal in fine phase increments while comparing the magnitudes of the signal samples so produced to determine whether they have magnitudes within a given range of values. The range of values is indicative of a known phase angle. The number of magnitudes falling within the given range is indicative of the phase of the sampled signal relative to the known phase angle. Embodiments are disclosed in which such phase measuring arrangement is employed in a phase-locked loop useful for processing chrominance signals in a television receiver.

REFERENCES:
patent: 4122487 (1978-10-01), Beaulier et al.
patent: 4280099 (1981-07-01), Rattlingourd
patent: 4291332 (1981-09-01), Kato et al.
patent: 4393397 (1983-07-01), Holmes
patent: 4402005 (1983-08-01), Lewis
patent: 4462110 (1984-07-01), Baldwin
patent: 4471299 (1984-09-01), Elmis
ITT Auto Flesh Processing Circuit.

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