FIELD: radio engineering, communication.
SUBSTANCE: system for active noise reduction with an ultrasonic radiator consists of a microphone, analogue-to-digital converter, a received signal processing device, a digital-to-analogue converter, an ultrasonic radiator, a high-frequency radiation generator with a mixer, a broadband amplifier and an acoustic filter. The generator and the mixer are situated between the signal processing device and the digital-to-analogue converter, and a power amplifier is connected by its input to the output of the digital-to-analogue converter, the output of the amplifier is connected to a piezoelectric transducer and the output of the transducer is connected to the input of the acoustic filter.
EFFECT: wide spectrum of emitted frequencies.
2 cl, 1 dwg
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