Digital logarithmic apparatus

Details Digital logarithmic apparatus Digital logarithmic apparatus

1976-10-15

1978-05-09

Gruber, Felix D.

Boots, shoes, and leggings

328145, 364701, 235 92CA, 235 92CC, G06F 1534, H03K 378

Patent

active

040890600

ABSTRACT:
Digital apparatus for approximating the logarithmic equation of the form: X= W Log.sub.z (Y)+ K where W and K are selected constants, employs basically a three counter, one comparator logarithmic digital calculator assembly. A source provides a selected train of time spaced pulses to a divide by N counter, which drives a first counter. The clock pulses also go to a second counter. The comparator at each clock pulse compares the counts of the first and second counters. If the count of the second counter is greater than that of the first counter, an output pulse is produced, which resets the second counter and including an output circuit.

REFERENCES:
patent: 3436533 (1969-04-01), Moore et al.
patent: 3662163 (1972-05-01), Miller et al.
patent: 3673391 (1972-06-01), Lougheed
patent: 3821524 (1974-06-01), Wahl
patent: 3943342 (1976-03-01), May et al.
patent: 3956616 (1976-05-01), Knollenberg
patent: 3988600 (1976-10-01), Katsuoka et al.
patent: 3991301 (1976-11-01), Chaprnka

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