SOUND PROCESSING APPARATUS AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To suppress feedback sound while suppressing the generation of musical noise caused by spectrum subtraction. SOLUTION: A feedback sound estimation unit 24 generates an estimated feedback sound component n2 (t) obtained by estimating a feedback sound component n1 (t) reaching a sound collection apparatus 14 from a sound emission apparatus 12. A feedback sound suppression unit 26 suppresses the estimated feedback sound component n2 (t) from a sound signal w1 (t) generated by the sound collection apparatus 14. A kurtosis calculation unit 52A calculates kurtosis KA (m) in a frequency distribution of intensity of an estimated residual sound component e2 (t) obtained by estimating a residual component within a feedback sound component n1 (t) after processing by the feedback sound suppression unit 26. A coefficient setter 54 sets a subtraction coefficientα(m) in accordance with the kurtosis KA (m) calculated by the kurtosis calculation unit 52A. A spectrum subtraction unit 42 adjusts a spectrum E2 (m, f) of the estimated residual sound component e2 (t) in accordance with a subtraction coefficientα(m) to be subtracted from a spectrum W2 of a sound signal w2 (t) after processing by the feedback sound suppression unit 26. COPYRIGHT: (C)2010,JPO&INPIT