| 摘要 |
The present invention is a fire detection system. A timer sets an observation time. This may be accomplished by a first counter or shift register receiving a predetermined number of oscillator pulses. A second counter or shift register counts an alarm pulse produced by an AND circuit from the oscillator and the output of a fire detector. If the observation time expires before the second counter or shift register reaches its full count, the second counter or shift register is reset. If the second counter or shift register reaches its full count prior to the expiration of the observation time, the fire alarm is activated. Using this method, the system distinguishes a false alarm from the fire detector from the actual start of a fire.
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