Electro-optical data handling system with noise immunity

Details Electro-optical data handling system with noise immunity Electro-optical data handling system with noise immunity

1987-12-28

1988-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

455608, 455619, G02F 100

Patent

active

047867973

ABSTRACT:
A source of light modulated by input data provides the modulated light to a phototransistor. A capacitor couples the emitter of the phototransistor to ground. A discharging transistor switch is coupled across the capacitor and a voltage comparator is coupled to the phototransistor emitter for providing a signal when the voltage across the capacitor exceeds a predetermined threshold. A microprocessor coupled to the comparator actuates the discharging switch in accordance with the comparator output.

REFERENCES:
patent: 4620321 (1986-10-01), Chown
patent: 4654892 (1987-03-01), Ely
patent: 4679251 (1987-07-01), Chown
patent: 4688267 (1987-08-01), Chown et al.

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