Coded data generation or conversion – Digital code to digital code converters – Tree structure
Patent
1990-08-08
1992-03-31
Swann, III, Glen R.
Coded data generation or conversion
Digital code to digital code converters
Tree structure
250221, 2503381, 250340, 250395, G08B 1318
Patent
active
051011948
ABSTRACT:
A passive infrared radiation (PIR) detection system permits data developed by the PIR detection system to be interpreted, to in essence "look into" a protected area and to positively determine the character of any images detected in the protected area. The system includes an array of PIR detectors for monitoring defined zones of the region to be protected. The array of PIR detectors is contained within an enclosure which is further provided with a lensing system which permits the several PIR detectors to monitor respectively assigned zones of the protected region from a single vantage point. The array of PIR detectors operates to develop a series of electrical signals which are then passed on for further processing and interpretation in accordance with various prescribed tests (criteria) which operate to distinguish between an intruder and other legitimate images capable of exciting the PIR detection system.
REFERENCES:
patent: 4263585 (1981-04-01), Schaefer
patent: 4799243 (1989-01-01), Zepke
patent: 4912748 (1990-03-01), Horii et al.
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