SOUND SOURCE SIGNAL ESTIMATION DEVICE, SOUND SOURCE SIGNAL ESTIMATION METHOD, AND PROGRAM

摘要

Provided is a sound source signal estimation technique whereby degradation in sound quality can be inhibited by taking both amplitude components and phase components into account when removing crosstalk components. In the present invention, βm,m'(ω) (1 ≤ m ≤ M, 1 ≤ m' ≤ M, m' ≠ m) is taken as a coefficient indicating the degree to which a crosstalk component of a signal from an m'th sound source distorts an mth separate sound source signal ^Sm(f, ω). A crosstalk component removing unit comprises: a coefficient calculation unit that calculates coefficient βm,m'(ω) by solving a prescribed optimization problem for the set of m and m' in which 1 ≤ m ≤ M, 1 ≤ m' ≤ M, and m' ≠ m; and a crosstalk-component-free signal calculation unit that uses coefficient βm,m'(ω) to calculate an mth estimated sound source signal ~Sm(f, ω) (m = 1, …, M) from an mth separate sound source signal ^Sm(f, ω) (m = 1, …, M).