US 11,758,324 B2
PSD optimization apparatus, PSD optimization method, and program
Hironobu Chiba, Tokyo (JP); Kenta Niwa, Tokyo (JP); and Noboru Harada, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/633,190
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Aug. 8, 2019, PCT No. PCT/JP2019/031450
§ 371(c)(1), (2) Date Feb. 5, 2022,
PCT Pub. No. WO2021/024475, PCT Pub. Date Feb. 11, 2021.
Prior Publication US 2022/0279274 A1, Sep. 1, 2022
Int. Cl. H04R 3/04 (2006.01); G06F 17/11 (2006.01); H04R 3/00 (2006.01); H04R 5/04 (2006.01)
CPC H04R 3/04 (2013.01) [G06F 17/11 (2013.01); H04R 3/005 (2013.01); H04R 5/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power spectral density (PSD) optimization device including a PSD updater that,
with uS as a variable representing a target sound PSD, uIN as a variable representing an interference noise PSD, and uBN as a variable representing a background noise PSD,
takes a target sound PSD input value  φS(ω, τ), an interference noise PSD input value  φIN(ω, τ), and a background noise PSD input value  φBN(ω, τ) as input, and generates a target sound PSD output value φS(ω, τ), an interference noise PSD output value φIN(ω, τ), and a background noise PSD output value φBN(ω, τ), by solving an optimization problem for a cost function relating to the variable uS, the variable uIN, and the variable uBN,
wherein the optimization problem for the cost function is defined using at least one of:
a constraint based on difference in sound source enhancement characteristics of a beamformer in accordance with a degree of inclusion of a target sound, with regard to a PSD of signals beamformed in a target sound direction-of-arrival,
a convex cost term based on the difference in sound source enhancement characteristics of the beamformer in accordance with the degree of inclusion of the target sound, with regard to the PSD of signals beamformed in the target sound direction-of-arrival,
a constraint based on the difference in sound source enhancement characteristics of the beamformer in a frequency direction, with regard to the PSD of signals beamformed in the target sound direction-of-arrival, and
a convex cost term based on the difference in sound source enhancement characteristics of the beamformer in the frequency direction, with regard to the PSD of signals beamformed in the target sound direction-of-arrival.