Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1978-09-28
1980-07-22
Griffin, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358148, H04N 944, H04N 504
Patent
active
042142601
ABSTRACT:
A line synchronization circuit in a television receiver in which gate pulses are derived from the oscillatorsignal for keying-out the synchronizing signal, in which the gate pulses are positioned by means of a phase-control loop symmetrically with respect to an edge of a reference signal which is also derived from the oscillator signal. Consequently the gate pulses may be very small which increases the noise immunity. The nominal voltage of the oscillator may be derived from the output of the control loop. The circuit also supplies a keying pulse for the color synchronization signal. Pulling-in can be accelerated in the case of narrow gate pulses by increasing the width thereof in case of non-coincidence of the gate and the line synchronizing pulses or by interrupting the supply thereof.
REFERENCES:
patent: 3863080 (1975-01-01), Steckler
patent: 3904823 (1975-09-01), van Straaten
patent: 3969760 (1976-07-01), Coffey
patent: 3991270 (1976-11-01), van Straaten et al.
patent: 4015287 (1977-03-01), Hovens
patent: 4024343 (1977-05-01), Cense et al.
Briody Thomas A.
Goodman Edward W.
Griffin Robert L.
Psitos Aristotelis M.
Streeter William J.
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