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Related Concept Videos

Passive Filters01:27

Passive Filters

592
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
592
Active Filters01:25

Active Filters

909
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
909
Design Example01:23

Design Example

359
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
359
Parallel Resonance01:23

Parallel Resonance

255
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
255

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Updated: Aug 25, 2025

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Efficient and High-Purity Sound Frequency Conversion with a Passive Linear Metasurface.

Wei Wang1, Chengbo Hu1, Jincheng Ni2

  • 1Collaborative Innovation Center of Advanced Microstructures and Key Laboratory of Modern Acoustics, MOE Institute of Acoustics, Department of Physics, Nanjing University, Nanjing, 210093, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 17, 2022
PubMed
Summary

A novel rotating passive linear vortex metasurface achieves high-efficiency, high-purity sound frequency conversion at low audible frequencies. This robust system offers real-time control and cascading capabilities for advanced acoustic manipulation.

Keywords:
acoustic metasurfaceacoustic orbital angular momentumhigh-efficiency frequency conversionrotational Doppler effect

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Area of Science:

  • Acoustics and Wave Physics
  • Metamaterials and Nanotechnology
  • Signal Processing

Background:

  • Conventional nonlinearity-based frequency conversion methods in optics and acoustics suffer from poor mode purity, low conversion efficiency, and limited reconfigurability.
  • The Rotational Doppler effect offers a linear approach to frequency shifting but requires spiral-phase changes during wave propagation, posing practical challenges.

Purpose of the Study:

  • To develop a high-efficiency, high-purity, and reconfigurable frequency conversion mechanism for low-frequency acoustic waves.
  • To explore the application of a rotating passive linear vortex metasurface for acoustic frequency manipulation.

Main Methods:

  • Numerical simulations and experimental validation of a rotating passive linear vortex metasurface.
  • Investigation of frequency conversion efficiency, mode purity, and topological charge stability under varying rotational speeds and transmissivity.
  • Demonstration of cascading multiple metasurfaces for extended frequency conversion.

Main Results:

  • Achieved close-to-unity mode purity (>93%) and high conversion efficiency (>65%) for acoustic waves as low as 3000 Hz.
  • Demonstrated robustness and stability, with topological charge largely unaffected by rotational speed and transmissivity.
  • Successfully verified cascading of multiple metasurfaces for enhanced frequency conversion.

Conclusions:

  • The presented rotating vortex metasurface offers a robust and efficient solution for acoustic frequency conversion, overcoming limitations of conventional methods.
  • This approach enables precise, in-situ control and diversification of sound frequency manipulation.
  • Potential impacts span acoustic communications, signal processing, and contactless detection.