Patent ID: 11922964
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. A power spectral density (PSD) optimization method including a PSD updating step, in which,
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,
a PSD optimization device takes a target sound PSD input value {circumflex over ( )}φS, an interference noise PSD input value {circumflex over ( )}φIN, and a background noise PSD input value {circumflex over ( )}φBN as input, and generates a target sound PSD output value φS, an interference noise PSD output value φIN, and a background noise PSD output value φBN, 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 relating to a frequency structure of a sound source or a convex cost term relating to the frequency structure of the sound source,
a constraint relating to a temporal structure of the sound source or a convex cost term relating to the temporal structure of the sound source, and
a constraint relating to a spatial structure of the sound source or a convex cost term relating to the spatial structure of the sound source.