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Personal audio system for neckband headset with low computational complexity.

Se-Woon Jeon¹, Jung-Woo Choi¹

¹School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea.

The Journal of the Acoustical Society of America

|December 31, 2020

Summary

This study introduces a neckband headset with three speakers per ear for personal audio. The novel multichannel filter enhances near-field sound, improving sound isolation with reduced computational cost.

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Area of Science:

Acoustics
Signal Processing
Audio Engineering

Background:

Personal audio systems aim to create isolated sound zones.
Existing solutions often face challenges with computational cost and sound leakage.

Purpose of the Study:

To propose a near-field personal audio solution using a neckband headset.
To develop a simple multichannel filter for reduced computational load on mobile devices.
To enhance sound level difference between the listener's ears and surrounding areas.

Main Methods:

A neckband headset with three loudspeakers per ear was designed.
A multichannel filter was developed using pressure matching techniques.
The filter was simplified to approximate a broadside differential array pattern.
Infinite impulse response filters were used to realize the simplified filter structure.

Main Results:

The proposed multichannel filter effectively boosts near-field sound.
Sound radiation to far-field areas was suppressed.
The simplified filter structure was realized using two second-order infinite impulse response filters.
Simulations and experiments confirmed effective personal audio system realization.

Conclusions:

The proposed neckband headset solution offers effective personal audio with minimal loss of sound isolation.
The simplified multichannel filter reduces computational cost for mobile applications.
This approach provides a practical method for creating personal sound zones.