Telephonic communications – Emergency or alarm communications – Responsive to sensed nonsystem condition
Patent
1992-04-02
1994-05-31
Kuntz, Curtis
Telephonic communications
Emergency or alarm communications
Responsive to sensed nonsystem condition
379 44, 379 50, 379 51, 379 37, 379102, 340567, H04M 1104, H04M 1100, G08B 1318
Patent
active
053176200
ABSTRACT:
A battery-powered infrared sensor security system capable of operating on a single set of batteries for a minimum of one year. The system is connected to a telephone line and employs a bidirectional dual-tone multiple frequency (DTMF) tone generator/receiver to allow communication to and from a remote location. The system status may be checked from the remote location and certain system parameters may be varied from the remote location. The system uses a Fresnel lens arrangement and a pair of infrared sensors to provide a substantially uniform field of coverage of 180.degree.. The system also uses real time digital analysis of the output signals from the infrared sensors. The digital analysis uses time sequence analysis of the output signals, performs variance measurements between the current measurement of the infrared sensor signals and the stored time sequence, coherence measurements between the two sensors, and can compare measured amplitude spectra to predefined signature spectra entered by the user.
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patent: 4912748 (1990-03-01), Horii et al.
patent: 4922450 (1990-05-01), Rose et al.
patent: 5101194 (1992-03-01), Sheffer
patent: 5107120 (1992-04-01), Tom
Chan Jasan
Kuntz Curtis
Orca Technology, Inc.
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