Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1983-03-17
1986-01-28
Psitos, Aristotelis M.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358330, 358310, H04M 942
Patent
active
045675074
ABSTRACT:
Color TV signal data picked up from an NTSC video disc is separated by a separation filter into a first chrominance signal (1.52 MHz) and a luminance signal. In this case, the rotational frequency of the video disc is set such that a horizontal line frequency of the luminance signal is 15.625 kHz, which is the line frequency of a PAL signal component. The first chrominance signal (1.52 MHz) is converted by a frequency converter to a second chrominance signal (4.43 MHz). The second chrominance signal (4.43 MHz) is supplied to the first input terminal of a switch through a 45.degree. phase shifter and directly to the second input terminal of the switch. The switch alternately selects the first and second input terminals thereof in response to a burst gate pulse, whereas the switch selects only the second input terminal during any period other than the burst period. A third chrominance signal is then produced at an output terminal of the switch. The third chrominance signal is supplied to a modulator. A carrier signal having a frequency (8.86 MHz) twice that (4.43 MHz) of a subcarrier is supplied to the modulator for every other line so as to perform the R-Y axis processing. Therefore, a PAL chrominance signal appears at an output terminal of the modulator.
REFERENCES:
patent: 3702377 (1972-11-01), Kerr et al.
patent: 3872498 (1975-03-01), Pritchard
patent: 3917415 (1975-11-01), Eguchi
patent: 4283738 (1981-08-01), Rutishauser
Honda Kazuhiko
Kusakabe Tetsuo
Sakai Tetsuro
Psitos Aristotelis M.
Tokyo Shibaura Denki Kabushiki Kaisha
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