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Published on: January 28, 2019
A bank of beamformers implementing a constant-amplitude panning law
Yoomi Hur1, Jonathan S Abel1, Young-cheol Park2
1Center for Computer Research in Music and Acoustics, Music Department, Stanford University, Stanford, California 94305 yoomi@ccrma.stanford.edu, abel@ccrma.stanford.edu.
Abstract:
This paper describes a technique for designing a collection of beamformers, a "beamformer bank," that approximately produces a constant-amplitude panning law. Useful in multichannel audio recording scenarios, a point source will appear with energy above a specified sidelobe level in at most two adjacent beams, and the sum of all beam signals will approximate the source signal. A design method is described in which a specified sidelobe level determines beamwidth as a function of arrival direction and frequency, leading directly to the number and placement of beams at each frequency. Simulation results are presented verifying the proposed technique's performance.
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