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Related Concept Videos

Active Filters01:25

Active Filters

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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:
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Design Example01:23

Design Example

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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...
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Passive Filters01:27

Passive Filters

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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...
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Multi-functional programmable active acoustic meta-device: acoustic switch, lens, and barrier.

Anil Pundir1, Arpan Gupta2, Sarthak Nag3

  • 1Acoustics and Vibration Laboratory, School of Mechanical and Materials Engineering, IIT Mandi, Kamand, Mandi, Himachal Pradesh, 175005, India. ptd2006@students.iitmandi.ac.in.

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Summary

This study introduces a novel active acoustic metamaterial (AAMM) that functions as a multi-functional active acoustic meta-device (AAMD). This device can switch between acoustic switch, lens, and barrier functionalities by altering its configuration without material deformation.

Keywords:
Acoustic barrierAcoustic lensActive acoustic meta-materialMulti-functional meta-deviceProgrammable acoustic switch

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Area of Science:

  • Acoustics
  • Materials Science
  • Metamaterials

Background:

  • Active acoustic metamaterials (AAMM) offer multi-functional capabilities.
  • Programmable acoustic devices are crucial for advanced wave manipulation.

Purpose of the Study:

  • To demonstrate a novel AAMM programmable as a multi-functional Active Acoustic Meta-device (AAMD).
  • To enable switching between Acoustic Switch (AS), Acoustic Lens (AL), and Acoustic Barrier (AB) functionalities.

Main Methods:

  • The AAMM design utilizes relative displacements of scatterers to alter its dispersion diagram.
  • Basic design parameters like constituent elements, lattice constants, and filling fractions remain constant.
  • Functionalities are achieved by reconfiguring the AAMM without relying on constituent deformation.

Main Results:

  • As an Acoustic Lens (AL), it exhibits zero and negative refraction over a 200 kHz frequency range.
  • As an Acoustic Barrier (AB), it attenuates acoustic energy over a 700 kHz range compared to Phononic Crystals (PnC).
  • As an Acoustic Switch (AS), it operates across the entire 900 kHz applied frequency sweep.

Conclusions:

  • The proposed AAMM design offers versatile, switchable acoustic functionalities.
  • This programmable meta-device advances acoustic wave control and multi-functionality in acoustic metamaterials.