| 摘要 |
PROBLEM TO BE SOLVED: To further process output signals y1 , yN, etc., separated by a frequency range blind sound source separating method to which independent component analysis (ICA) is applied and to suppress noise based upon their reverberation components. SOLUTION: Noise-supressed yi (t) is obtained (S6) by finding each delayτij maximizing the cross-correlation between yi (ω,t) and each of other yj (ω,t-τ) (i=1 to N and j=1 to N except j≠1) (S2), giving the delaysτij to respective yi (ω,t) (S3), finding coefficientsαij (ω) of noise components included in yi (t) from the product of the correlation between the delayed signals and yj (t-τij ) and yi (t) and the ratio of respective totals (S4), multiplying and addingαij corresponding to respective yj (ω,t-τij ) and finding noise /yi <(c)> (ω,t) for yi (t,ω) (S5), and subtracting /yi <(c)> (ω,t) from yi (ω,t).
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