Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-06-04
1983-08-23
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 932
Patent
active
044007183
ABSTRACT:
At a transmitter, an analog NTSC color video signal is converted into a digital video signal and all of the signal components in the chrominance spectral band in alternate television frames are inverted. The resultant signal is transmitted via a low-speed digital signal transmission channel using interframe difference coding. At a receiver, the received digital signal is converted into an analog video signal and all of the signal components in the chrominance spectral band in the other alternate television frames are inverted. The resultant signal, having inverted chrominance, is reproduced on a conventional NTSC color television receiver. Bandpass and comb filtering, preferably on the digital signals, are used at the transmitter and at the receiver to separate the luminance and chrominance signal components to enable inversion of the chrominance components.
REFERENCES:
patent: 3858240 (1974-12-01), Golding et al.
patent: 4093949 (1978-06-01), Hedlund
patent: 4124205 (1979-02-01), Iinuma
patent: 4227204 (1980-10-01), Rossi
"Interframe Coding for 4MHz Colour Television Signals" by K. Iinuma et al., IEEE Transactions on Communications, vol. COM-23, No. 12, Dec. 1975, pp. 1461 to 1465.
"Composite Interframe Coding of NTSC Colour Television Signals" by T. Ishiguro et al., NTC 1976 (Dallas), vol. 2, pp. 6.4-1 to 6.4-5.
Chin Tommy P.
Haley R. John
Northern Telecom Limited
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