Sync separator with periodic updating

Details Sync separator with periodic updating Sync separator with periodic updating

1986-04-30

1987-09-29

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328139, H04N 508, H04N 510

Patent

active

046972110

ABSTRACT:
A sync separator detects the occurrence of a corresponding sync pulse in a corresponding part of the waveform of a composite video signal. The level of the sync tip is used for updating a slice level signal, provided the level of the sync tip is lower than that of the preceding sync tip signal. A time-out signal is generated at the end of a time-out interval that has elapsed from the last time the sync tip signal was updated, provided the sync tip signal was not updated within such time-out interval. The time-out signal is used for updating the sync tip signal. The sync tip signal is updated according to such sync pulse that occurred during the time-out interval, having the lowest level sync tip. Information obtained from the sync tip and back porch portions of the corresponding sync pulse is used for generating a slice level signal. A comparator responsive to the slice level signal separates a sync signal from the composite video signal.

REFERENCES:
patent: 3706847 (1972-12-01), Smeulers
patent: 4185299 (1980-01-01), Harford

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