Automatic amplitude control circuit for a vector scope

Details Automatic amplitude control circuit for a vector scope Automatic amplitude control circuit for a vector scope

1995-05-17

1996-12-31

Kostak, Victor R.

Television

Monitoring, testing, or measuring

Monitor

H04N 1702

Patent

active

055898777

ABSTRACT:
A signal processing circuit for a vector scope adapted to display and measure characteristics of a color video signal on a screen which comprises a variable gain circuit 3, a demodulation circuit 6, timing signal generator 7, amplitude detection circuits 8,9, memory 12 storing a reference amplitude and CPU11. An input signal V.sub.in through the variable gain circuit is supplied to demodulation circuiting from where chrominance components R-Y, B-Y are provided to the amplitude detection circuits. When the timing signal is provided to the amplitude detection circuits, the circuits detect their amplitudes. The CPU computes an amplitude of a burst signal in accordance with the detected amplitudes and the difference between the computed amplitude and the reference amplitude stored in the memory. If the difference is not zero, the CPU controls the variable gain circuit so that it become zero.

REFERENCES:
patent: 3820156 (1974-06-01), Schulz
patent: 3850412 (1974-11-01), Olson
patent: 4485396 (1984-11-01), Sandberg
patent: 4875089 (1989-10-01), Judge
patent: 5172229 (1992-12-01), Baker
patent: 5175614 (1992-12-01), Proebstel
Fernseh Und Kinotechnik, vol. 39, No. 12, 30 Dec. 1985 Berlin DE, Atreya N. "Dynamisch Messung Und Uberwachung Der F/H-Phase", pp. 597-598.
Philips TV Test Equipment Catalog 1993, Eindhoven (NL), "Philips Test Equipment", pp. 120-123.

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