FIELD: ultrasonic intruder and fire alarms, particularly for protection of informatization objects into which sound information to be protected circulates.
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, noise generator, phase changer, attenuator, summing unit and emitting electroacoustic audio frequency transformer.
EFFECT: prevention of circulating information escape.
6 dwg
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