Glass break detection using multiple frequency ranges

Details Glass break detection using multiple frequency ranges Glass break detection using multiple frequency ranges

1995-03-10

1996-09-03

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340566, 340541, 73659, G08B 1300

Patent

active

055527701

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 sounds only when low frequencies are detected not before the high frequencies are first detected but within a predetermined time period after the first detection of the high frequencies.

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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.
patent: 5438317 (1995-08-01), McMaster
patent: 5450061 (1995-09-01), McMaster

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