Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-07-17
1998-04-21
Kuntz, Curtis
Communications: electrical
Condition responsive indicating system
Specific condition
340556, 340541, 381 56, G08B 1300
Patent
active
057422320
ABSTRACT:
A first wave of a glass breaking sound has a sharp peak due to an impact sound and thereafter it attenuates rapidly. The attenuating characteristics of the first wave is measured with an attenuating time or a magnitude of attenuation thereof so that whether or not glass breaking has occurred is determined. Since an original waveform obtained by a microphone includes noise, low frequency components are eliminated by a high pass filter. The characteristics of the first wave of the glass breaking sound is almost stable. Therefore, by detecting the characteristics from the first wave, the glass breaking can be detected without errors. Further, since the glass breaking is detected by attenuation of the first wave, the detection can be carried out quickly.
REFERENCES:
patent: 4060803 (1977-11-01), Ashworth, Jr.
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
patent: 5117220 (1992-05-01), Marino et al.
patent: 5185593 (1993-02-01), Du Rand
patent: 5192931 (1993-03-01), Smith et al.
patent: 5229748 (1993-07-01), Ehriner et al.
patent: 5323141 (1994-06-01), Petek
patent: 5414409 (1995-05-01), Voosen et al.
patent: 5438317 (1995-08-01), McMaster
patent: 5450061 (1995-09-01), McMaster
patent: 5471195 (1995-11-01), Rickman
patent: 5510767 (1996-04-01), Smith
patent: 5515029 (1996-05-01), Zhevelev et al.
patent: 5543783 (1996-08-01), Clark et al.
patent: 5552770 (1996-09-01), McMaster
Hayashi Toshio
Kurahashi Akira
Kuntz Curtis
Mei Xu
Nippondenso Co. Ltd.
LandOfFree
Glass breaking detection device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Glass breaking detection device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Glass breaking detection device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2061898