Signal processing apparatus and binary encoder circuit for the s

Details Signal processing apparatus and binary encoder circuit for the s Signal processing apparatus and binary encoder circuit for the s

1987-11-09

1989-09-26

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

235436, 235472, 250555, 307358, 307359, G06K 710

Patent

active

048702625

ABSTRACT:
Disclosed is a signal processing apparatus comprising a sensor whose impedance varies according to changes in quantity sensed thereby, a power source applying a voltage to the sensor, a current/voltage conversion circuit for converting an output of current flowing through the sensor to a voltage signal, and a feedback means for passing a current corresponding to the output voltage of the current/voltage conversion circuit through the sensor. In a practical example thereof, a photosensor as the sensor is supplied with the voltage, the output current of the photosensor is supplied to the input terminal of the current/voltage conversion circuit, the output voltage of the current/voltage conversion circuit is compared with a reference voltage in a comparison circuit, the output thereof is supplied through a rectifier circuit to a voltage holding circuit to be held thereby and also supplied to a buffer circuit, the output voltage of the buffer circuit is supplied through a resistor to the input terminal of the current/voltage conversion circuit, and a processed signal is output from the output terminal of the current/voltage conversion circuit.

REFERENCES:
patent: 3777268 (1973-12-01), Cleobury et al.
patent: 3940704 (1976-02-01), Bockett-Pugh
patent: 3949233 (1976-04-01), Gluck
patent: 4305008 (1981-12-01), Sutton
patent: 4363977 (1982-12-01), Tsuda et al.
patent: 4517455 (1985-05-01), Benitez et al.
patent: 4554583 (1985-11-01), Saitoh et al.

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