Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-06-06
1987-06-16
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358316, H04N 971, H04N 968
Patent
active
046739700
ABSTRACT:
A chrominance signal processing system includes a variable gain amplifier capable of effecting gain control for amplifying a carrier chrominance signal and an A/D converter for effecting an analog/digital conversion of an output of the variable gain amplifier. A demodulator demodulates an output of the A/D converter into two chrominance signals on two demodulation axes which are apart by 90.degree. from each other. One of the chrominance difference signals is disposed at a right angle with respect to a vector of a burst signal of the carrier chrominance signal and the number of bits of the two chrominance difference signals are chosen such that the number of bits of the one chrominance difference signal disposed at right angles with respect to the burst signal vector is smaller than the number of bits of the other of the two chrominance difference signals. A computing circuit computes an amplitude of the burst signal from the two chrominance difference signals and a gain control circuit produces a circuit for controlling the gain of the variable gain amplifier from the output of the computing circuit. The two chrominance difference signals may be the R-Y and B-Y signal components of a carrier chrominance signal.
REFERENCES:
patent: 4306247 (1981-12-01), Tomimoto et al.
patent: 4466015 (1984-08-01), Wargo et al.
patent: 4482916 (1984-11-01), Acampora
patent: 4539583 (1985-09-01), Flamm et al.
patent: 4573069 (1986-02-01), Lewis, Jr.
Matsumoto Tokikazu
Nakagawa Yukio
Uchiyama Shinich
Bauer Robert Michael
Groody James J.
Matsushita Electric - Industrial Co., Ltd.
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