Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-04-10
2000-08-29
Westin, Edward P.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
341157, G01J 516, H03M 160
Patent
active
061112569
ABSTRACT:
The digital sampler circuit processes an output signal from a high gain analog amplifier having as input an infrared motion detector output signal and a negative low pass filtered feedback signal. The amplifier output signal is a substantially square pulse signal having an irregular frequency and duty cycle and has an average duty cycle indicative of a DC level and a slow change in the DC level of the detector output signal. The sampler circuit includes a detector circuit for detecting the amplifier output signal and discriminating at regular intervals a high/low state of the output signal, and generates a high/low feedback signal corresponding to the high/low state of the output signal detected. The high/low state of the output signal is analyzed over a predetermined number of the intervals to obtain a ratio value for producing an output digital signal sample value. The digital sample value is a measure of the DC level and the change in the DC level of the detector output signal. The digital sample is accurate and requires a single comparator and relatively simple circuitry.
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Microchip PIC16C62X Data Sheet Manual published 1995.
Hanig Richard
Shmuel Hershkovitz & Pinhas Shpater
Westin Edward P.
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