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Towards altering sound frequency at will by a linear meta-layer with time-varying and quantized properties

Engineering and Technology

Towards altering sound frequency at will by a linear meta-layer with time-varying and quantized properties

Y. Zhang, K. Wu, et al.

Discover a groundbreaking mechanism that transforms wave frequencies into desired values through a digitally pre-defined, time-varying material property. This innovative research by Yumin Zhang, Keming Wu, Chunqi Wang, and Lixi Huang showcases an electromagnetic diaphragm capable of modulating acoustic impedance and has profound implications for super-resolution imaging and encrypted underwater communication.

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Playback language: English
Abstract
This paper introduces a linear mechanism to convert wave frequency to any desired value using a digitally pre-defined, time-varying material property. The device, an electromagnetic diaphragm with a MOSFET-controlled shunt circuit, achieves an acoustic impedance modulation ratio of up to 45. Experiments demonstrate audible sound conversion to infrasound and ultrasound, and a monochromatic tone to white noise via randomized MOSFET time sequences. Potential applications include super-resolution imaging, sub-wavelength energy flow control, and encrypted underwater communication.
Publisher
Communications Physics
Published On
Sep 29, 2021
Authors
Yumin Zhang, Keming Wu, Chunqi Wang, Lixi Huang
Tags
wave frequency
time-varying material
acoustic impedance
infrasound
ultrasound
energy flow control
underwater communication
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