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Implementation narrowly directed beeper

By David Hladký


The present final thesis discusses the transmission of a narrowly directional parametric sound beam through an amplitude-modulated ultrasonic wave, utilizing the effect of auto-demodulation in a nonlinear medium and ensuring the subsequent processing of the input signal for the parametric sound transmitter. Emphasis is placed on the mathematical tools that relate to parametric sound transmission in a nonlinear medium. The basic part of the thesis describes a parametric speaker and the associated amplitude modulation techniques, which constitute a major prerequisite for the processing of the transmitted signal. In the following section, the author then analyzes the computational intensity of these techniques, considering applicable hardware approaches. Finally, the fabrication and practical use of the proposed solution are discussed, including the measurement of typical parameters such as the spatial radiation characteristics, total harmonic distortion, and transmission channel bandwidth

Topics: nelineární prostředí; STM NUCLEO-411RE.; amplitudová modulace; Parametric acoustic array; auto-demodulation; parametrický reproduktor; ultrazvuková vlna; amplitude modulation; PZT transducer; Hilbertova transformace; autodemodulace; nonlinear medium; ultrasound wave; Hilbert transform; PZT měnič; parametric loudspeaker; Parametrické akustické pole
Publisher: Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií
Year: 2016
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