| 摘要 |
The noise removal device includes plural microphones, a time axis adjustment unit, an FFT analysis unit, and a noise removal processing unit, and determines frequency signals of a to-be-extracted sound by performing a threshold judgment on each of the phase distances, of the mixed sounds each received through a corresponding one of the microphones, in the case where the phases are expressed by the expression ψ′(t)=mod 2&pgr;(ψ(t)−2&pgr;ft) (f denotes a reference frequency).
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