Horizontal synchronization, clock synchronization, D. C. restora

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

1988-03-03

1989-05-09

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, H04N 7093, H04N 708

Patent

active

048293776

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 producing 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, Jr.
patent: 3436471 (1969-04-01), Mounts et al.
patent: 3472962 (1969-10-01), Sanford
patent: 3666888 (1972-05-01), Sekimoto
patent: 3755624 (1973-08-01), Sekimoto
patent: 4350999 (1982-09-01), Mortimer

Affiliated with

Also associated with

Rating

Horizontal synchronization, clock synchronization, D. C. restora does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Horizontal synchronization, clock synchronization, D. C. restora, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Horizontal synchronization, clock synchronization, D. C. restora will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-93508