| 摘要 |
PROBLEM TO BE SOLVED: To robustly analyze source sound components and reverberation components for propriety of condition setting.SOLUTION: For a probability model for distributing respective acoustic components of acoustic signals SA into source sound components X(f,t) and reverberation components W(f,t) according to a source sound-reverberation distribution coefficient &bgr;(f) and distributing the reverberation components W(f,t) into acoustic components Y(f,t-i) over a plurality of unit periods in the past according to a unit distribution coefficient gi(f) for each unit period on a time base, a reverberation analysis part 34 calculates respective posterior distributions (q(X(f,t)), q(&bgr;(f)), q(gi(f))) of the source sound components X(f,t), the source sound-reverberation distribution coefficient &bgr;(f) and the respective unit distribution coefficients gi(f). In the probability model, a prior distribution for which the unit distribution coefficients gi(f) of the respective acoustic components Y(f,t-i) are densely distributed is imparted to the respective unit distribution coefficients gi(f), and an absence information prior distribution is imparted to the source sound components X(f,t) and the source sound-reverberation distribution coefficient &bgr;(f). |
