Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1983-05-25
1986-01-21
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 13, H04N 1104
Patent
active
045660280
ABSTRACT:
In a digital signal processing system, an analog-to-digital converter producing digital representations of an analog signal is dithered to increase its apparent quantizing resolution. Certain processing of the digital signals, however, can result in the loss of the dither information, because of either the form of digital filtering employed or the number of bits of the digital signals processed. To avoid the effects of such loss, the least significant bit of the digital signals is delayed and is applied to an analog output device to reintroduce a dither signal thereat having a magnitude substantially equivalent to that of the lost bit. The present invention is useful in processing digital television signals in a television receiver having a digital signal processing section.
REFERENCES:
patent: 4275411 (1981-06-01), Lippel
patent: 4317129 (1982-02-01), Favreau
patent: 4334237 (1982-06-01), Reitmeier et al.
patent: 4352123 (1982-09-01), Flamm
A. Goldberg, "PCM Encoded NTSC Color Television Subjective Tests", Journal of the SMPTE, vol. 82, Aug. 1973, pp. 649-654.
V. Devereux, "Application of PCM To Broadcast Quality Video Signals", The Radio and Electronic Engineer, vol. 44, No. 7, Jul. 1974, pp. 373-381.
ITT Semiconductors, VLSI Digital TV System DIGIT 2000, Aug. 1982.
Bolger Thomas V.
Lewis, Jr. Henry G.
Berard Jr. Clement A.
Rasmussen Paul J.
RCA Corporation
Shepperd John W.
Whitacre Eugene M.
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