PAL offset generator

Details PAL offset generator PAL offset generator

1983-04-22

1986-03-11

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, 331 20, 331 46, 455259, H04N 506

Patent

active

045757577

ABSTRACT:
A color subcarrier generator for PAL uses a one-quarter horizontal frequency signal from a sync generator to sample the subcarrier signal. The sampled signal is phase and frequency compared with a 25 Hz (one-half vertical frequency) signal from the same sync generator to control the frequency of the subcarrier signal. Thus the required 25 Hz PAL offset is obtained. The one-quarter horizontal frequency sampling signal can also be used in NTSC and SECAM subcarrier generators.

REFERENCES:
patent: 3571513 (1971-03-01), Ward et al.
patent: 4278994 (1981-07-01), Van der Valk

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