SILENT EMERGENCY ALARM SYSTEM FOR SCHOOLS AND THE LIKE
First Claim
1. In a stationary structure defining a plurality of discrete stationary locations and a central stationary location, a method of indicating at said central location the existence of an emergency in any of said discrete locations, the method including the steps of:
- providing in each of said discrete stationary locations fixedly located detection means for detecting a supersonic signal generated therein;
providing in said central location display means, which are directly connected by means of continuous wires to the detection means in the various discrete locations, and which include a plurality of indicators, each associated with a different detection means and energized when the detection means with which it is associated detects a supersonic signal;
generating in each discrete stationary location at which an emergency exists a supersonic signal which is detected by the detection means in the discrete location;
providing audio means in at least one of said discrete stationary locations, said audio means including a variabe gain audio amplifier; and
automatically increasing the gain of said amplifier when the detection means in the stationary location detect a supersonic signal which is generated therein.
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Abstract
In a school each classroom (or other area) is instrumented with a hidden microphone and receiver tuned to a non-audible frequency. The receivers'"'"''"'"' outputs are connected to a central display unit in the school'"'"''"'"'s administrative office. Each instructor is provided with a small concealable transmitter which, when hand activated by the instructor upon the occurrence of any emergency, generates a non-audible signal at the receiver'"'"''"'"'s tuned frequency.
17 Citations
2 Claims
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1. In a stationary structure defining a plurality of discrete stationary locations and a central stationary location, a method of indicating at said central location the existence of an emergency in any of said discrete locations, the method including the steps of:
- providing in each of said discrete stationary locations fixedly located detection means for detecting a supersonic signal generated therein;
providing in said central location display means, which are directly connected by means of continuous wires to the detection means in the various discrete locations, and which include a plurality of indicators, each associated with a different detection means and energized when the detection means with which it is associated detects a supersonic signal;
generating in each discrete stationary location at which an emergency exists a supersonic signal which is detected by the detection means in the discrete location;
providing audio means in at least one of said discrete stationary locations, said audio means including a variabe gain audio amplifier; and
automatically increasing the gain of said amplifier when the detection means in the stationary location detect a supersonic signal which is generated therein.
- providing in each of said discrete stationary locations fixedly located detection means for detecting a supersonic signal generated therein;
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2. In combination with a stationary structure defining a plurality of discrete stationary chambers each adapted to be occupied by a plurality of individuals and a stationary control location, a system for indicating at said control location the existence of an emergency in any of said chambers, the system comprising:
- separate detection means installed in each stationary chamber for detecting a non-audible signal generated therein;
control means located in said control location, directly coupled to said separate detection means and including a separate energizable indicator for each separate detection means installed in each chamber, said control means further including means for energizing each indicator associated with a detection means which detects a non-audible signal;
signal generating means in each discrete stationary location for generating a non-audible signal therein; and
audio means associated with at least one of said stationary chambers, said audio means including a variable gain audio amplifier, and means for coupling said amplifier to the detection means in said chamber with the gain of said amplifier increasing when the detection means detect a non-audible signal in said chamber.
- separate detection means installed in each stationary chamber for detecting a non-audible signal generated therein;
Specification