Electrical servo system having manual override affecting servo l

Details Electrical servo system having manual override affecting servo l Electrical servo system having manual override affecting servo l

1984-04-30

1986-12-09

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, H04N 964

Patent

active

046283463

ABSTRACT:
In a color television receiver, color reference oscillations, developed by a VCO under AFPC loop control, are supplied to a variable phase shifter. A phase detector, responsive to the phase shifter output and to the burst component of received color television signals, develops a control voltage indicative of the phase relationship therebetween at its output terminal. Application of the control voltage to a control voltage input terminal of the phase shifter completes a servo control loop for maintaining the phase of the shifter's output in a predetermined relationship with the burst phase. A manual hue control potentiometer has an adjustable tap connected to the phase detector output terminal in such manner that tap adjustment alters voltage at control voltage input terminal while concomitantly altering servo loop gain.

REFERENCES:
patent: 4096515 (1978-06-01), Brown, Jr.
patent: 4183048 (1980-01-01), Isono
patent: 4533939 (1985-08-01), Cense
Copending U.S. Patent Application of L. A. Harwood, filed Mar. 28, 1984, and entitled "Chrominance Processor Control System".
Bang & Olufsen service manual for Beovision 5100, 7100, 8100 Color TV Receivers (bearing date of 12-82) pp. 4 (and cover page).
Portion of Schematic for Blaupunkt FM-120 Color TV Receiver (Circa 1980-1).

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