Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-06-16
1983-09-20
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358327, H04N 593, H04N 9493
Patent
active
044059370
ABSTRACT:
A chrominance signal reproducing apparatus is proposed, in which an oscillation frequency of a first voltage-controlled oscillator is controlled by each of the error control voltages produced from APC and AFC circuits and the signal having the frequency component of the 1/4 output frequency of the first VCO and the output frequency signal of a second VCO are added to produce a sum frequency, which is used to frequency-convert a low-frequency converted carrier chrominance signal to a carrier chrominance signal before low-frequency conversion. The AFC circuit operates only when the frequency F'.sub.sc of the carrier chrominance signal before the low-frequency conversion is deviated 1/8 f.sub.H (f.sub.H : horizontal synchronizing frequency) or above with respect to the carrier chrominance frequency f.sub.sc, so as to apply the control voltage to the first VCO thereby to drive the deviation within the range of .+-.1/8 f.sub.H. When the f'.sub.sc is in the range of f.sub.sc -1/8f.sub.H <f'.sub.sc <f.sub.sc +1/8f.sub.H, the APC circuit controls the first VCO so that f'.sub.sc = f.sub.sc.
REFERENCES:
patent: 3974520 (1976-08-01), Kuroyanagi
patent: 4100567 (1978-07-01), Yoshinaka
New Chrominance Signal Processing LSI for Home VCR, by Nakagawa, et. al., IEEE Transactions on Consumer Electronics, vol. CE-26, Aug. 1980, pp. 315-322.
Kudo Mitsuru
Nakagawa Isao
Chin Tommy P.
Hitachi , Ltd.
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