Compatible color television with regenerable signals

Details Compatible color television with regenerable signals Compatible color television with regenerable signals

1982-03-05

1986-02-04

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358138, 358310, 358343, H04N 1106

Patent

active

045689660

ABSTRACT:
Novel means are disclosed for conditioning a standard color-television composite signal, such as the NTSC composite, so that pictorial information is represented according to Nyquist samples which are very coarsely quantized and therefore regenerable. This conditioning does not affect compatibility with a standard receiver or perceptibly reduce the quality of a picture displayed thereon. Carefully designed dither, such as 3-dimensional nasik dither, is employed to preserve picture information and quality despite coarse quantization. An improved receiver also regenerates the received signal so that unwanted noise, distortion and interference are removed. The disclosure exemplifies the teachings of the invention in terms of broadcast and cable television systems and video recording systems. An improved videodisk record is disclosed and means whereby, in a pay-television system, the picture incorporated into a standard composite signal may be key-encrypted according to a private cryptographic key.

REFERENCES:
patent: 3562420 (1971-02-01), Thompson
patent: 3739082 (1973-06-01), Lippel
patent: 3967052 (1976-06-01), Judice
patent: 4015286 (1977-03-01), Russell
patent: 4023199 (1977-05-01), Netravali et al.
patent: 4275411 (1981-06-01), Lippel
patent: 4388655 (1983-06-01), Zenzefilis
patent: 4460924 (1984-07-01), Lippel
"Digital Coding of Color Picture Phone Signals by Element-Differential Quantization" by Limb et al., IEEE Transactions on Communication Technology, vol. Com-19, No. 6, Dec. 1971, pp. 992-1005.

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