Title: Computer utilizing logarithmic function generators

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Claims: What is claimed is:

1. A computer responsive to a main input signal directly proportional to a first function x for producing a main output signal of a magnitude directly proportional to a second function x.sup.1/y, where y is a third function, said computer comprising: a first function generator having an output and being responsive to said main input signal for producing a first output signal at said output thereof directly proportional to 1/y log x; an output circuit having first and second inputs and an output; and a second function generator having an input connected from said output circuit output, said second function generator output being connected to said output circuit second input, said output circuit first input being connected from said first function generator output, said output circuit being constructed to produce a main output signal at said output of said output circuit, said second function generator producing a second output signal at said output thereof directly proportional to the logarithm to the same base as that of said log x of said output circuit main output signal, said output circuit being constructed to drive said main output signal to a magnitude such that said second output signal becomes equal in magnitude to that of said first output signal.

2. The invention as defined in claim 1, wherein said first function generator includes a first logarithmic amplifier having an input to receive said main input signal, said first logarithmic amplifier also having an output, said first function generator having a voltage divider connected from said first logarithmic amplifier output to said output circuit first input, said output circuit including a differential amplifier having an inverting input connected from said voltage divider, said differential amplifier also having a non-inverting input and an output, said non-inverting input being connected from the output of said second function generator input, said differential amplifier output being connected to said second function generator input, said second function generator including a second logarithmic amplifier having an input and an output connected respectively to the input and output of said second function generator.

Other info:

Inventors: Romo, Edgar A. (Costa Mesa, CA, US)

Application Number: 598783
Filing Date: 1975-07-24
Publication_date: 1976-06-22
Assignee: International Telephone and Telegraph Corporation (New York, NY)
Primary Class(es): 708/851 327/350, 708/807
Other Classes:
US Patent Ref:

3342984	Sep, 1967	Gray et al.	235/193.
3439187	Apr, 1969	Strauss	235/197.
3518578	Jun, 1970	Oppenheim et al.	328/145.
3657528	Apr, 1972	Plante	328/145.
3849706	Nov, 1974	Johnson et al.	328/145.

Other Refs:
Primary Examiner: Ruggiero, Joseph F.
Assistant Examiner:
Attorney: Stolzy; A. Donald