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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: Jun 1, 2025

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

Published on: March 6, 2019

Sparse loudspeaker array design for wideband frequency-invariant beamforming with multiple targets.

Keyu Pan¹, Simiao Chen¹, Yiming Han¹

¹Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China.

The Journal of the Acoustical Society of America

|January 21, 2025

Summary

This study introduces a new method for designing sparse loudspeaker arrays that create multiple sound beams efficiently. The approach reduces the number of drivers needed while maintaining sound quality, saving costs and design time.

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Last Updated: Jun 1, 2025

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Area of Science:

Acoustics
Signal Processing
Array Design

Background:

Current sparse array design methods optimize for single directions, limiting multi-channel sound systems.
Wideband frequency-invariant beamforming in multiple directions is crucial for advanced sound applications.

Purpose of the Study:

To present a novel design method for sparse loudspeaker line arrays.
To achieve wideband frequency-invariant beams in multiple target directions.
To reduce the number of drivers and computational cost in beamforming systems.

Main Methods:

A tapped delay line model was developed.
A two-stage design approach was proposed: compressive sensing with an extended fast iterative shrinkage-thresholding algorithm for driver placement, followed by least squares for driver excitation.
Numerical simulations were used for validation.

Main Results:

A 32.3% reduction in the number of drivers compared to uniform linear arrays was achieved.
Frequency-invariant beam properties were maintained.
The algorithm demonstrated significant computational efficiency.

Conclusions:

The proposed method enables efficient design of sparse loudspeaker arrays for multi-directional beamforming.
This approach is suitable for sound projection and can be extended to other multi-channel beamforming systems.
The method reduces system costs and design time while ensuring reliable beam performance.