Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-04-08
1995-09-12
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340566, 340541, G08B 1300
Patent
active
054500613
ABSTRACT:
Apparatus and a method for detecting glass breaking from an impact. Low frequencies are detected that are characteristics of the glass flexing from the impact, and high frequencies are detected that are characteristic of a) the sound of the impact and b) the glass breaking. An alarm signal is issued when the low and high frequencies occur in a predetermined sequence, and have appropriate durations, that are characteristic of glass breaking events. More specifically, the alarm signal is issued only when the detected low frequencies last for a minimum duration on a sliding scale related to their magnitude. Weaker signals must last longer.
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Detection Systems Inc.
Lee Benjamin C.
Mathews J. Addison
Peng John K.
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