Alarming system

Details Alarming system Alarming system

1991-11-22

1992-12-15

Swann, III, Glen R.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340527, 340529, 340430, 340550, G08B 1304

Patent

active

051720930

ABSTRACT:
In a glass smashing alarm system for generating an alarm when a glass smashing sound is detected, the present invention is directed to reduce the possibility of occurrence of an erroneous alarm, and includes a normal alarm mode in which a preliminary alarm is raised for a short time when a glass smashing sound is detected, and a special alarm mode in which a main alarm is raised for a long time when the glass smashing sound is detected, and is constituted in such a manner that mode switching is effected so as to shift the mode to the special alarm mode at the end of the preliminary alarm, and to return it to the normal alarm mode after the passage of a predetermined time if the glass smashing sound is not detected at the end of the main alarm or during the special alarming mode. In another aspect of the invention, generation of an alarm is inhibited if a key unlock switch is turned ON before passage of a predetermined time from detection of the glass smashing sound.

REFERENCES:
patent: 4030087 (1977-06-01), Ritchie et al.
patent: 5084697 (1992-01-01), Hwang

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