| 摘要 |
PROBLEM TO BE SOLVED: To provide a near-field sound source separation method emphasizing only near-field sound by suppressing far-field sound without using assumption of a room transfer function and an inverse filter thereof. SOLUTION: In order to separate a near-field sound source based on an amplitude ratio between microphones arranged with prescribed intervals with respect to one sound source on a two-dimensional flat plate, amplitudes of respective microphones are extracted, the amplitude ratio between the microphones is determined, an SN ratio is estimated from the amplitude ratio, the relation between the SN ratio and the amplitude ratio with respect to each sound source distance is calculated based on the distance attenuation and, by using a weighting function selected from among a plurality of weighting functions compiled as a database, in accordance with the distance from the sound source which is desirably emphasized, the estimated SN ratio is weighted and, thereby, the emphasis of the near-field sound is performed. COPYRIGHT: (C)2009,JPO&INPIT
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