Analog-to-digital conversion apparatus including double dither s

Details Analog-to-digital conversion apparatus including double dither s Analog-to-digital conversion apparatus including double dither s

1983-05-25

1985-09-24

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 932

Patent

active

045435995

ABSTRACT:
Digital representations of analog signals are limited in resolution accuracy by the number of bits in the digital output signal of an analog-to-digital converter which limits the number of analog output levels produceable by a digital-to-analog converter. The apparent resolution accuracy can be improved, however, by the addition of two "dithering" signals, one at a lower frequency and one at a higher frequency, to increase the number of transitions of the least significant bit (LSB) of the digital signals. In a television receiver employing digital signal processing apparatus, dither signals having magnitudes equivalent to 1/2 and 1/4 LSB and at frequencies related to the TV line frequency and the color subcarrier frequency are preferred.

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R. H. Stafford, "Bandwidth Reduction and Communication Aspects", Digital Television, pp. 50-51.
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, 7/74, pp. 373-378.
ITT Semiconductors, VLSI Digital TV System DIGIT 2000, Aug. 1982.

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