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A selective array activation method for the generation of a focused source considering listening position.

Min-Ho Song¹, Jung-Woo Choi, Yang-Hann Kim

¹Graduate School of Culture Technology, Korea Advanced Institute of Science and Technology, Science Town, Daejeon, 305-701, Korea. godspd@kaist.ac.kr

The Journal of the Acoustical Society of America

|February 23, 2012

Summary

This study introduces a new method to reduce artifacts in virtual auditory sources generated by acoustic focusing. The technique significantly lowers the energy of problematic convergent waves, improving the virtual source illusion.

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Area of Science:

Acoustics
Signal Processing
Virtual Audio

Background:

Focused sound sources can create auditory illusions of virtual sources.
Time-reversed acoustic focusing generates these virtual sources but suffers from artifacts due to convergent waves.

Purpose of the Study:

To propose and evaluate an array activation method for reducing artifacts in time-reversed acoustic focusing.
To enhance the quality of virtual sources for listeners within an arbitrary loudspeaker array.

Main Methods:

Developed a novel array activation method to control wave convergence.
Applied the method to a selected listening point within a loudspeaker array of arbitrary shape.

Main Results:

The proposed method effectively reduces the energy of convergent waves.

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Energy reduction of up to 60 dB was achieved in a significant region around the listening point.

Conclusions:

The array activation method successfully mitigates artifacts in time-reversed acoustic focusing.
This leads to improved realism and usability of virtual auditory sources.