Scaling device as for quantized B-Y signal

Details Scaling device as for quantized B-Y signal Scaling device as for quantized B-Y signal

1983-05-25

1985-12-03

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 13, 358 36, 358 30, 358 27, H04N 950, H04N 932, H04N 521, H04N 952

Patent

active

045569002

ABSTRACT:
A signal processing apparatus includes a scaling device for increasing the magnitude of a signal from a source to better use the dynamic range of processing apparatus, and to reduce the effects of noise and error sources. This is particularly useful in a television receiver where the maximum magnitude of the (B-Y) chrominance signal component of a composite video signal is smaller than that of the (R-Y) chrominance signal component. To provide improved resolution of the (B-Y) signal components, a gain scaling arrangement increases the magnitude of the (B-Y) signal component to more closely approximate that of the (R-Y) signal component. In a TV receiver having digital signal processing apparatus, a digital multiplier scales the digitized (B-Y) signal component thereby to reduce the errors inherent in processing digital data having a limited number of bits, especially where such processing includes rounding or truncating operations which can introduce additional errors or decrease resolution.

REFERENCES:
patent: 3803390 (1974-04-01), Schaepman
patent: 4231100 (1980-10-01), Eggermont
patent: 4270139 (1981-05-01), Flamm et al.
patent: 4295223 (1981-10-01), Shutterly
patent: 4335395 (1982-06-01), Clarke
patent: 4355326 (1982-10-01), Lee
T. Fischer, "Digital VLSI Breeds Next-Generation TV Receivers", Electronics, Aug. 11, 1981, pp. 97--103.
ITT Semiconductors, VLSI Digital TV System DIGIT 2000, Aug. 1982, pp. 1--31.
W. Weltersbach et al., "Digitale Videosignalverarbeitung im Farbfernsehempfanger", Fernseh Und Kino Technik, 35 Jahrgang, Nr. 9/1981, Sep. 1981, pp. 317--23 (with translation).

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