Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1983-03-17
1986-02-25
Psitos, Aristotelis M.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358330, 358310, H04N 942
Patent
active
045730865
ABSTRACT:
In a video disc player system, the NTSC color TV signal is recorded on the video disc, of which carrier chroma signal has been lowered to e.g., 1.52 MHz, due to limitations on the available frequency band within this system. To reproduce this recorded TV signal by the PAL TV receiver, it is necessary to convert it into the corresponding standard PAL TV signal. To this end, the lower carrier chroma signal frequency is up-converted to the subcarrier one (4.43 MHz) of the PAL TV system. There are provided a doubler which can double a subcarrier signal frequency derived from a standard subcarrier generator, a DC source and an adder circuit in which the doubled subcarrier signal frequency (8.86 MHz) is added to the DC component under the given adding ratio so as to produce a modulating signal. The up-converted carrier chrominance signal is then modulated by the modulating signal. After filtering the modulated signal and adding it to the up-converted carrier chrominance signal under a given adding ratio, the resultant chrominance signal is combined with the luminance signal, resulting in a composite PAL color TV signal. The signal converting circuit of the invention can also by used to convert the PAL TV signal recorded on the video disc to the corresponding NTSC TV signal.
REFERENCES:
patent: 3702377 (1972-11-01), Kerr et al.
patent: 3917415 (1975-11-01), Eguchi
patent: 4283738 (1981-08-01), Rutistiauser
Honda Kazuhiko
Sakai Tetsuro
Psitos Aristotelis M.
Tokyo Shibaura Denki Kabushiki Kaisha
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