Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1992-04-22
1995-06-27
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340538, 34087021, 34031001, G08B 2900, H04B 300
Patent
active
054283426
ABSTRACT:
A system for analyzing the operating conditions of electrical apparatus in order for the aged to check the change and abnormal state of life and for the external institute to check the safety of the houses or homes and so on. The data of standard power spectra of particular consumption current for each apparatus are stored in the memory of the system. The electrical signal detected from the wiring conductor is converted into a digital signal by the preprocessor and undergoes fast Fourier transform at the processor so as to be converted into an extracted power spectrum. If the extracted power spectrum includes a particular one of the standard power spectra as a result of comparing this spectrum with the standard power spectra, the operating conditions of that apparatus are stored in the memory with lapse of time. Thus, the life condition/rhythm of the private person can be checked by himself from the operating conditions of apparatus, and also transmitted as life information through the communication network to the outside institutes.
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Enoki Hideo
Kawauchi Masataka
Nakamura Ichiro
Ohki Hiroshi
Sakai Kazuo
Crosland Donnie L.
Hitachi , Ltd.
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