Horizontal synchronization, clock synchronization, D.C. restorat

Details Horizontal synchronization, clock synchronization, D.C. restorat Horizontal synchronization, clock synchronization, D.C. restorat

1988-08-01

1990-11-13

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 358176, H04N 7073

Patent

active

049705920

ABSTRACT:
An analog TV system includes a transmitter which produces a horizontal unique pulse sequence during each horizontal blanking interval. The pulse sequence is amplitude modulated between two levels to define a horizontal unique word for horizontal synchronization. The frequency of the pulse sequence is selected for use by the receiver section as the color subcarrier phase reference. The average level of the pulse sequence is set at the transmitter and used at the receiver for DC restoration in a clamping circuit. The peak amplitude of the pulses of the pulse sequence define a reference level against which a receiver produced local reference is compared for AGC. As four separate functions are accomplished by a single unique pulse sequence transmitted during the horizontal blanking interval, which four functions are typically accomplished using four separate signals transmitted sequentially during the horizontal blanking interval, a substantial portion of the horizontal blanking interval remains available for other data.

REFERENCES:
patent: 2240600 (1941-05-01), Applegarth
patent: 2240601 (1941-05-01), Applegarth
patent: 3436471 (1969-04-01), Mounts et al.
patent: 3472962 (1969-10-01), Sanford
patent: 3493674 (1970-02-01), Houghton
patent: 3755624 (1973-08-01), Sekimoto
patent: 4350999 (1982-09-01), Mortimer
patent: 4479150 (1984-10-01), Ilmer et al.
patent: 4797744 (1989-01-01), Klemmer et al.
patent: 4829377 (1989-05-01), Becker et al.

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