FIELD: ultrasonic intruder and fire alarm, particularly for rooms with high noise level.
SUBSTANCE: device has generator, transmitting and receiving electroacoustic ultrasonic frequency converters, high-frequency amplifier, low-frequency amplifier, mixer, alarm units to warn about intruder and fire, note amplifier, phase changer, attenuator, summing unit and receiving electroacoustic sound transformer.
EFFECT: prevention of false operation in presence of intensive noise in scanned area due to noise compensation.
2 dwg
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