Title:
SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND SIGNAL PROCESSING PROGRAM
Document Type and Number:
WIPO Patent Application WO/2021/038782
Kind Code:
A1
Abstract:
A signal processing device 1 is provided with: an expansion coefficient calculation unit 11 that calculates an expansion coefficient of spherical harmonics for reproducing a sound field from an outward sound field to be reproduced; an expansion coefficient conversion unit 12 that converts the calculated expansion coefficient of the spherical harmonics to a weighting coefficient of superposition of a multi-pole sound source; a filter coefficient calculation unit 13 that calculates, from the weighting coefficient, a filter coefficient corresponding to each speaker which is included in a multi-pole speaker array and provides an output outward; and a convolution computing unit 14 that convolves the filter coefficient corresponding to each speaker in an input acoustic signal and calculates an output acoustic signal to each speaker.
Inventors:
IMAIZUMI KENTA (JP)
TSUTSUMI KIMITAKA (JP)
NAKADAIRA ATSUSHI (JP)
TSUTSUMI KIMITAKA (JP)
NAKADAIRA ATSUSHI (JP)
Application Number:
PCT/JP2019/033870
Publication Date:
March 04, 2021
Filing Date:
August 29, 2019
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04R3/00; G10K11/34; H04R1/40
Foreign References:
| JP2019050492A | 2019-03-28 | |||
| JP2019075616A | 2019-05-16 |
Other References:
HANEDA, YOICHI ET AL: "Directivity synthesis using multipole sources based on spherical harmonic expansion", JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN, vol. 69, no. 11, 30 November 2013 (2013-11-30), pages 577 - 588, XP055732240
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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