Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1979-11-14
1984-06-12
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340538, 307128, 307140, 179 5R, G08B 2900, H04M 1104
Patent
active
044545029
ABSTRACT:
Apparatus for a monitoring and signalling system such as a home health care system. The monitoring and signalling system includes a plurality of ac-based sensors powered by an ac voltage and operative to monitor the occurrence of activities performed by an individual in his or her residence and to produce signals indicative of the occurrence of the monitored activities. Signals produced by the sensors during the presence of the ac voltage are processed by a microprocessor. A loss or absence of the ac voltage and the subsequent restoration of the ac voltage causes the ac-based sensors to produce signals falsely indicating the occurrence of monitored activities. In accordance with the present invention, the microprocessor operates to monitor the state of the ac voltage to detect a loss or absence of the ac voltage and a subsequent restoration thereof and, upon detecting the restoration of the ac voltage, to refuse to accept for processing, for a two-second interval, signals received from the sensors.
REFERENCES:
patent: 3808860 (1974-04-01), King
patent: 3885235 (1975-05-01), Bergstrom et al.
patent: 4007456 (1977-02-01), Paige et al.
patent: 4138670 (1979-02-01), Schneider et al.
Fahey Robert J.
Resnick Martin L.
Crosland Donnie L.
United Telecommunications, Inc.
Ziarhos Peter
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