Glass breakage detector

Details Glass breakage detector Glass breakage detector

1993-12-29

1996-05-07

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340540, 340556, G08B 1320

Patent

active

055150292

ABSTRACT:
A method of detecting glass breakage utilizing the sound produced by an event comprising the steps of sensing the sound and producing an electrical signal characteristic of the sound, producing a plurality of frequency band-limited signals from the sound signal, determining when a normalized rate-of-rise of a plurality of the band limited signals is above a given value specified for the particular band-limited signal and analyzing the sound signal further only if a plurality of the band-limited signals have a normalized rate-of-rise greater than their respective given value during a specified time period.

REFERENCES:
patent: 3863250 (1975-01-01), McCluskey, Jr.
patent: 3889250 (1975-06-01), Solomon
patent: 4091660 (1978-05-01), Yanagi
patent: 4134109 (1979-01-01), McCormick et al.
patent: 4668941 (1987-05-01), Davenport et al.
patent: 4837558 (1989-06-01), Abel et al.
patent: 4853677 (1989-08-01), Yarbrough et al.
patent: 5117220 (1992-05-01), Marino
patent: 5192931 (1993-03-01), Smith

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