Document Type and Number:
Japanese Patent JPS526586
Kind Code:
B2
Abstract:
A system for converting a ratio of two input signals into a logarithmic value comprises the steps of charging a capacitor with an electronic charge which is proportional to said first input signal to be compared, discharging through a discharge resistance for discharging the electronic charge on said capacitor, detecting the period of time between the beginning of said discharge of said capacitor and the time when the voltage across said capacitor intersects with the voltage which is proportional to the second input signal to be compared, and integrating the voltage of an electrical power source with said capacitor and said discharge resistance during a period which is proportional to the above-mentioned period thereby determining the logarithmic value of the ratio between said second input signal and said first input signal as the ratio between the integrating voltage and said voltage of said electrical power source.
Application Number:
JP1132872A
Publication Date:
February 23, 1977
Filing Date:
February 02, 1972
Export Citation:
International Classes:
G06G7/24; G06J1/00
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