Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1984-12-26
1987-03-24
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
360 331, 360 32, 358 12, H04N 9493
Patent
active
046529381
ABSTRACT:
A digital processing circuit for a video signal digital by processing a composite video signal. More specifically, a composite video signal is separated into a luminance signal and a color signal by means of a Y/C separator (10). The color signal separated is converted into a signal having low frequency by means of a low frequency converter (11) that the signal having low frequency is converted into a digital signal by means of an A/D converter (13). The luminance signal separated is converted into a digital signal by means of an A/D converter (12). Digital signals are transmitted through a transmission line (5). The transmitted luiminance signal is converted into an analog signal by means of a D/A converter (14) so that the analog signal is supplied to a Y/C mixer (17). The transmitted color signal is converted into an analog signal by means of a D/A converter (15) and the analog signal thus obtained is demodulated to a signal having the initial frequency by means of a demodulator (16) so that the signal having the initial frequency is supplied to the Y/C mixer (17). The Y/C mixer (17) mixes the luminance signal converted into the analog signal and the color signal converted to the signal having the initial frequency so that an output signal is provided therefrom.
REFERENCES:
patent: 4513327 (1985-04-01), Takahashi et al.
patent: 4549201 (1985-10-01), Tanaka et al.
"Sub-Nyquist Sampled PCM NTSC Color TV Signal Derived from Four Times the Color Subcarried Sampled Signal", John P. Rossi, IEE Conference Publication, 166 (1978), pp. 218-221.
Kojima Masanori
Murakami Mitsuru
Mitsubishi Denki & Kabushiki Kaisha
Richardson Robert L.
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