Title:
FILTER COEFFICIENT OPTIMIZATION DEVICE, FILTER COEFFICIENT OPTIMIZATION METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2021/171533
Kind Code:
A1
Abstract:
Provided is filter coefficient optimization technology that enables design of a beam former that is good quality and stable, by taking into account filter coefficient relationships between adjacent frequency bins. This filter coefficient optimization device includes an optimization unit that calculates an optimal value for filter coefficients w={w1,…,wF} (where wf is the filter coefficient of the frequency bin f) of a beam former that emphasizes a sound (target sound) from D sound sources. Defining af,d as an array manifold vector of a frequency bin f corresponding to a sound wave of a planar wave arriving from a direction θd where a sound source d is present, the optimization unit calculates an optimal value on the basis of the optimization problem of a cost function defined using the sum of a prescribed normalization term and the sum of a cost function LMV_f(wf) under a prescribed constraint condition. The prescribed normalization term is defined using the phase difference between adjacent frequency bins relating to a response wf
Haf,d of a beam former at a frequency bin f with respect to a direction θd.
Inventors:
SATO RYOTARO (JP)
NIWA KENTA (JP)
NIWA KENTA (JP)
Application Number:
PCT/JP2020/008233
Publication Date:
September 02, 2021
Filing Date:
February 28, 2020
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04R1/40; G10K11/34; G10L21/0272; H04R3/00
Domestic Patent References:
| WO2019081035A1 | 2019-05-02 |
Foreign References:
| JP2018107697A | 2018-07-05 | |||
| US9456276B1 | 2016-09-27 | |||
| US9668066B1 | 2017-05-30 |
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
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