Method and means for operating logarithmic circuits

Details Method and means for operating logarithmic circuits Method and means for operating logarithmic circuits

1979-10-19

1981-11-10

Wise, Edward J.

Boots, shoes, and leggings

364498, 364570, 356325, G06F 702

Patent

active

043002030

ABSTRACT:
A method and means for operating log converter circuits in which the method comprises the steps of sequentially conducting to the input of the log converter circuit signals representing a known transmittance (T) of 100% T, 10% T, 1% T, and 0.1% T, these signals covering the range of operation of the log converter circuit, storing the outputs of the circuit as signals representing an absorbance (A) of 0A, 1A, 2A, and 3A, respectively, conducting to the input of the log converter circuit an unknown signal, and utilizing a microcomputer to perform a linear interpolation of the output of the circuit with the unknown signal applied thereto using the previously stored 0A, 1A, 2A, and 3A signals.

REFERENCES:
patent: 3633012 (1972-01-01), Wilhelmson et al.
patent: 3720813 (1973-03-01), Badessa
patent: 4063816 (1977-12-01), Itoi et al.
patent: 4092069 (1978-05-01), Fukuda et al.
patent: 4093991 (1978-06-01), Christie, Jr. et al.
patent: 4171913 (1979-10-01), Wildy et al.

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