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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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Related Experiment Video

Updated: Jan 17, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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Design, analysis, and experimental validation of a stepped plate parametric array loudspeaker.

Woongji Kim1, Beomseok Oh1, Chayeong Kim1

  • 1Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea.

The Journal of the Acoustical Society of America
|September 25, 2025
PubMed
Summary

This study introduces a novel stepped plate parametric array loudspeaker (SPPAL) for efficient sound generation. The SPPAL offers a compact and manufacturable alternative to traditional parametric loudspeakers.

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Area of Science:

  • Acoustics
  • Mechanical Engineering
  • Signal Processing

Background:

  • Conventional parametric loudspeakers often rely on complex transducer arrays.
  • There is a need for more compact and efficient parametric sound generation methods.

Purpose of the Study:

  • To design and analyze a novel stepped plate parametric array loudspeaker (SPPAL).
  • To develop an integrated modeling framework for SPPAL performance evaluation and optimization.
  • To experimentally validate the SPPAL's acoustic performance.

Main Methods:

  • Developed an approximate analytical 3D model for transducer dynamics.
  • Utilized an equivalence ratio formulation for stepped plate and rigid piston behavior.
  • Employed spherical wave expansion for nonlinear sound field simulation.
  • Performed multi-objective analysis to optimize dual-resonance behavior.

Main Results:

  • Optimized transducer dual-resonance for enhanced low-frequency audio.
  • Identified combination resonance as an inherent phenomenon in SPPAL operation.
  • Validated analytical models through experimental frequency response, modal analysis, and sound field measurements.

Conclusions:

  • The SPPAL presents a viable, efficient, and compact alternative to conventional parametric loudspeakers.
  • Findings provide practical guidance for developing plate-based flexural vibration parametric array loudspeakers.
  • The integrated modeling framework effectively predicts and optimizes SPPAL performance.