De-emphasis for digitized composite color television signals

Details De-emphasis for digitized composite color television signals De-emphasis for digitized composite color television signals

1981-01-19

1983-06-14

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

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358 13, 358 21R, H04N 9535

Patent

active

043886388

ABSTRACT:
In a standard NTSC composite video signal, the peak excursion of the luminance plus chrominance signal for certain saturated colors exceeds the peak excursion of the white-representative luminance alone. When digitized, the signal is subject to quantizing noise. The effective spectial distribution of the quantizing noise is improved by reducing the amplitude of the chrominance signal so that the peak excursion of luminance plus chrominance for saturated colors does not substantially exceed the peak amplitude of white-representative luminance.

REFERENCES:
patent: 4261009 (1981-04-01), Tomimoto et al.
patent: 4268854 (1981-05-01), Ozawa
patent: 4316213 (1982-02-01), Wharton et al.
"Information Transmission, Modulation & Noise", Mischa Schwartz, McGraw-Hill Book Co., 1959, pp. 306 & 307.
"Digitals in Broadcasting", Harold E. Ennis, Howard W. Sams & Co., 1977, p. 269.
"PCM Encoded NTSC Color Television Subjective Tests", A. A. Goldberg, Digital Video, 1977, SMPTE, p. 21.

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