Movement detector for detecting movement within a predetermined

Details Movement detector for detecting movement within a predetermined Movement detector for detecting movement within a predetermined

1994-04-21

1995-08-01

Noland, Thomas P.

Communications: electrical

Condition responsive indicating system

Specific condition

340515, 367 94, G08B 1318, G08B 2920

Patent

active

054383188

ABSTRACT:
A movement detector includes a transmitter (1) and a receiver (2) of electromagnetic, acoustic or light waves, and a frequency variation demodulator (3) connected to the receiver (2) and adapted to supply a signal which is progressively variable as a function of the movement detected. The movement detector further includes an analog-digital converter (5) which transforms the demodulated signal into a digital signal, a memory (6) connected to the converter (5), and an arrangement for controlling the loading of the memory. The memory (6) continuously makes available information corresponding to a memorized threshold signal. A comparator (8) continuously compares the memorized threshold signal with the signal given off by the demodulator (3) and emits a signal when the former is less than the latter.

REFERENCES:
patent: 3781859 (1973-12-01), Hermans
patent: 3851301 (1974-11-01), Demers
patent: 4433328 (1984-02-01), Saphir
patent: 4527151 (1985-07-01), Byrne
patent: 4580249 (1986-04-01), Magee
patent: 4661936 (1987-04-01), Magee
patent: 4673935 (1987-06-01), Spencer
patent: 4721945 (1988-01-01), Maki
patent: 4929925 (1990-05-01), Bodine
patent: 5227764 (1993-07-01), Umemoto
Hobby Electronics, vol. 3, No. 9, Jul. 1981, pp. 11-13.
Patent Abstracts of Japan, vol. 012, No. 418 (E-678) JP-A-63 155 653 (Matsushita) 28 Jun. 1988.

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