Television – Synchronization – Automatic phase or frequency control
Patent
1993-08-26
1997-03-04
Harvey, David E.
Television
Synchronization
Automatic phase or frequency control
348536, 348537, H04N 504
Patent
active
056084633
ABSTRACT:
Disclosed herein is an oscillator circuit used for a PIP system which displays a child picture image without distortion even when the image method of the child picture image is different from that of a parent picture image. The oscillator circuit employed in such a system includes a programmable frequency divider for frequency dividing an output of a voltage-controlled oscillator with a frequency dividing ratio to produce a frequency-divided signal and a control circuit for controlling the oscillation frequency of the oscillator 201 according to a phase difference between the frequency-divided signal and a horizontal synchronizing signal. The frequency dividing ratio for the frequency divider is changed according to the image method of the child picture image.
REFERENCES:
patent: 3821470 (1974-06-01), Merrell
patent: 4251833 (1981-02-01), Fernsler et al.
IEEE Transactions on Consumer Electronics, vol. 37, No. 3, Aug. 1991, pp. 313-318.
Patenet Abstract of Japan, vol. 16, No. 112 (E-1180), Mar. 19, 1992.
Patent Abstract of Japan, vol. 11, No. 231 (E-527), Jul. 28, 1987.
Patent Abstracts of Japan, vol. 15, No. 115 (P-1181), Mar. 19, 1991.
Patent Abstract of Japan, vol. 4, No. 79 (E-14), Apr. 4, 1980.
Harvey David E.
NEC Corporation
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