Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-01-07
1981-12-15
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340565, G08B 1300, G08B 1320
Patent
active
043062288
ABSTRACT:
A method and system for evaluating output signals from at least one sound pickup of a security alarm system and for generating an alarm signal by performing the following operations: before the system is placed into operation, determining a first signal frequency range containing the frequency of a signal to be determined and a second signal frequency range containing the frequency of an interference signal; then, during operation, filtering the two frequency range components out of the sound pickup output signals, each component containing a respective one of the frequency ranges, comparing the amplitudes of the two frequency components to one another and generating a difference signal representative of the difference therebetween, and generating an alarm signal whenever the difference signal traverses a threshold value.
REFERENCES:
patent: 3614724 (1971-10-01), Brown et al.
patent: 3885234 (1975-05-01), Fujimoto
patent: 4012730 (1977-03-01), Nicholls
patent: 4097853 (1978-06-01), Francis, Jr.
patent: 4134109 (1979-01-01), McCormick et al.
LICENTIA Patent-Verwaltungs-G.m.b.H.
Swann III Glen R.
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