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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Published on: April 1, 2020

A superdirective array of phase shift sources.

Marcos F Simón Gálvez¹, Stephen J Elliott, Jordan Cheer

¹Institute of Sound and Vibration Research, University of Southampton, Southampton, Hampshire, SO17 1BJ, United Kingdom. mfsg1e10@soton.ac.uk

The Journal of the Acoustical Society of America

|August 17, 2012

Summary

This summary is machine-generated.

This study introduces a compact superdirective audio array using phase shift enclosures to direct sound. This technology enhances audio in specific zones, aiding hearing-impaired television viewers by minimizing overall sound power.

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Area of Science:

Acoustics
Audio Engineering
Signal Processing

Background:

Conventional audio systems can struggle with sound localization and intelligibility in enclosed spaces.
Hearing impairment presents challenges for enjoying audio-visual media, necessitating targeted sound enhancement.
Superdirective arrays offer potential for compact, directional sound sources.

Purpose of the Study:

To design and evaluate a superdirective array of audio drivers for enhanced sound delivery.
To minimize sound power output and reduce reverberant field excitation in enclosed environments.
To improve audio clarity for hearing-impaired individuals using television.

Main Methods:

Simulations comparing monopoles, phase shift loudspeakers, and double monopole arrays using contrast maximization.
Design and construction of an 8-driver array.
Anechoic environment testing of the array's acoustic response.
Comparison of acoustic contrast maximization with least squares formulations.

Main Results:

Phase shift enclosures enable directional sound emission from compact audio drivers.
Simulations and anechoic tests validate the array's performance.
A least squares formulation can achieve similar results to acoustic contrast maximization with appropriate target field selection.

Conclusions:

Superdirective audio arrays with phase shift enclosures are effective for directional sound control.
The developed array technology can enhance audio experiences for specific listeners, such as those with hearing impairments.
Optimization strategies like acoustic contrast maximization and least squares are crucial for achieving desired sound fields.