Circuit for rapidly determining the greatest difference among th

Details Circuit for rapidly determining the greatest difference among th Circuit for rapidly determining the greatest difference among th

1984-11-30

1987-09-22

Williams, Jr., Archie E.

Boots, shoes, and leggings

3401462, G05F 750, G05B 100

Patent

active

046959718

ABSTRACT:
A circuit for rapidly determining the greatest difference among three binarily represented numerical values also undertakes a classification and coding of the maximum difference within a number of different numerical ranges wherein only the most significant bits of the differences following the operational sign bit are required for such classification. A two-stage logic circuit is used for the classification and coding to which the most significant bits are supplied. The circuit is particularly useful in two-dimensional DPCM coding wherein a switchable quantizer and a quantizer controller are utilized to control the contrast of adjacent picture elements including an overall video display.

REFERENCES:
patent: 3196262 (1965-07-01), Thompson
patent: 3376408 (1968-04-01), Cogar
patent: 3434109 (1969-03-01), Coote
patent: 4200886 (1980-04-01), Musmann et al.
patent: 4386366 (1983-03-01), Mori
patent: 4410960 (1983-10-01), Kasuya
patent: 4450432 (1984-05-01), Schmidtpott et al.
"A Comparison of Extended Differential Coding Schemes for Video Signals," Musmann, Proceedings of the International Zurich Seminar on Digital Communications, Mar. 12-15, 1974, pp. C1(1)-C1(7).
"Test System for Digital TV Transmission," Klutz et al., Electrical Communication, vol. 51, No. 2, 1976, pp. 100-105.

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