Absolute difference generator for use in display systems

Details Absolute difference generator for use in display systems Absolute difference generator for use in display systems

1979-03-07

1980-08-19

Malzahn, David H.

Boots, shoes, and leggings

340739, 364785, G06F 750

Patent

active

042187516

ABSTRACT:
An absolute difference generator comprises an adder, an Exclusive-OR, two inverters and a latch. One input number is inverted, then presented to one input of the adder while the other input number is presented to the other input of the adder. The carry out line of the adder sets a latch, the output of which is fed back to the carry in line of the adder. The latch output is also combined with the adder output in an Exclusive-OR to control inversion of the adder output and produce the absolute difference between the input data.

REFERENCES:
patent: 3459926 (1969-08-01), Heilweil et al.
patent: 3725897 (1973-04-01), Bleiweiss
patent: 3816734 (1974-06-01), Brendzel
"Tektronix 4014, 4014-1, 4015 and 4015-1, Computer Display Terminal Service Instruction Manual" by Tektronix, Inc., Beaverton, Or. FIG. 6-27, 1974.

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