FIRE ALARM SYSTEM
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Abstract
A FIRE ALARM SYSTEM WHICH UTILIZES A PLURALITY OF LOW ENERGY FIRE DETECTION UNITS, EACH OPERATING SOLELY FROM ENERGY RECEIVED FROM A FIRE AND EACH BEING CAPABLE OF PRODUCING AND TRANSMITTING A STABILIZED RADIO FREQUENCY SIGNAL IN RESPONE TO AN ENVIRONMENTAL TEMPERATURE CHANGE RESULTING FROM A FIRE. A SINGLE REMOTE ALARM UNIT RECEIVES AND DEMODULATES THE TRANSMITTED SINGAL RECEIVED FROM ONE OR MORE DETECTION UNITS AND PRODUCES AN AUDIBLE AND/OR VISUAL ALARM IN RESPONSE THERETO. THE SENSITIVITY OF THE DETECTION UNITS IS MADE ADJUSTABLE AND THE RADIO FREQUENCY SIGNAL FROM EACH OF SUCH UNITS MAY BE APPROPRIATELY MODULATED BY AN AUDIO FREQUENCY SIGNAL. THE FREQUENCY VALUES OF SUCH RADIO FREQUENCY SIGNALS AND/OR AUDIO FREQUENCY SIGNALS MAY BE DIFFERENT FOR EACH DETECTION UNIT AND SUCH SIGNALS MAY BE SUITABLY UTILIZED AT THE RECEIVER ALARM UNIT TO IDENTIFY THE LOCATION OF THE FIRE.
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