Glass break detection using temporal sequence of selected freque

Details Glass break detection using temporal sequence of selected freque Glass break detection using temporal sequence of selected freque

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.

REFERENCES:
patent: 4091660 (1978-05-01), Yanagi
patent: 4134109 (1979-01-01), McCormick et al.
patent: 4668941 (1987-05-01), Davenport et al.
patent: 4853677 (1989-08-01), Yarbrough et al.
patent: 5117220 (1992-05-01), Marino et al.
patent: 5192931 (1993-03-01), Smith et al.

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