音響信号処理装置、音響信号処理方法および音響信号処理プログラム

Japanese Patent JP6955186

B2

An acoustic signal processing device 1 includes: a focal point position determination unit 12 that obtains a plurality of sets of initial focal point coordinates, coordinates of the virtual sound source, and a direction of directivity thereof, and for a pair of sets of initial focal point coordinates with different polarities among the plurality of sets of initial focal point coordinates, multiplies the sets of initial focal point coordinates by a rotation matrix based on the coordinates of the virtual sound source to thereby determine sets of focal point coordinates, the rotation matrix being specified from the direction of the directivity; a circular harmonic coefficient conversion unit 13 that calculates weights to be applied to multipoles including the sets of focal point coordinates from a circular harmonic coefficient; a filter coefficient computation unit 14 that, for each of the speakers in the speaker array, computes a weighted driving function to be applied to the speaker from the sets of focal point coordinates, polarities of the sets of focal point coordinates, and the weights to be applied to the multipoles; and a convolutional operation unit 15 that, for each of the speakers in the speaker array, convolves the weighted driving function for the speaker into the input acoustic signal to output the output acoustic signal for the speaker.

Kimitaka Tsutsumi
Kenichi Noguchi
Takada Hideaki
Yoichi Haneda

JP2020503603A

October 27, 2021

February 28, 2019

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Nippon Telegraph and Telephone Corporation

H04R3/00; H04R1/40; H04S7/00

JP2012169895A
JP2015507421A

羽田陽一 ほか,「球調和関数展開に基づく多重極音源を用いた指向性合成」,日本音響学会誌,日本,一般社団法人日本音響学会,2013年11月01日,第69巻第11号,pp.577-588
堤公孝 ほか,「焦点音源で生成した多重極音源による仮想音源の指向性制御」,日本音響学会 2017年秋季研究発表会 講演論文集,2017年09月,pp.469-470

Hidekazu Miyoshi
Rie Kudo

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