Circuit for reducing AFC offset error

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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Details

358158, 3581951, H04N 521, H04N 544

Patent

active

046086048

ABSTRACT:
A switched RF signal, formed of modulated RF and blanking level signals, is selectively phase inverted on alternate pairs of television lines to provide, after FM detection, a video signal containing alternating positive and negative offset errors. The video signal is integrated to average and thus, in effect, minimize the alternating errors.

REFERENCES:
patent: 3518362 (1970-06-01), Fessard
patent: 4091421 (1978-05-01), Long
patent: 4500922 (1985-02-01), Van Roessel

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