Apparatus and method for varying the timing of a control signal

Radiant energy – Photocells; circuits and apparatus – Signal isolator

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Details

250221, 250214AL, 455617, 340600, G02B 2700, G01V 904

Patent

active

049068539

ABSTRACT:
A system has individual infrared radiation transmitter assemblies which issue characteristics and coded identifying signals in infrared radiation, so that transmission and identification of a plurality of distinctively characteristic signals is accomplished by varying the timing of various periodic transmissions so as to avoid interference among the plurality of transmissions. A receiver assembly receives and decodes binary numbered codes sent from a plurality of the individual pocket-size transmitters for keeping track of the location of the transmitters within an area monitored by the receiver assembly. Each transmitter assembly has a timer which periodically variably issues electrical pulses within a predetermined time cycle. The timer actuates a clock oscillator to cause a code stored memory to be read out as coded electrical signals representing binary information and a light emitting diode converts the coded electrical signals into infrared radiation pulses representing the same binary information.

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