Logarithmic analog to digital converter

Details Logarithmic analog to digital converter Logarithmic analog to digital converter

1984-09-28

1986-11-25

Hix, L. T.

Communications: electrical

Audible indication

Percussion-type sound producer

340347NT, 340347CC, H03M 114, H03M 110

Patent

active

046251979

ABSTRACT:
A method and apparatus for converting an analog input signal to a digital output signal equal to the logarithm of the ratio of the input signal to a reference signal includes a method and apparatus for counting the cycles from a fixed frequency source for the time required for a capacitor to discharge through a resistor from a reference voltage to a calibration voltage; storing the result; counting the cycles from the same fixed frequency source for the time required for the capacitor to discharge through the resistor from the reference signal to the input signal and dividing the result by the stored result.

REFERENCES:
patent: 4034364 (1977-07-01), Fukuda et al.
patent: 4344067 (1982-08-01), Lee

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