| 摘要 |
PROBLEM TO BE SOLVED: To suppress musical noise when separating and extracting a signal of a specified sound source. SOLUTION: It is assumed that a left sound source and a right sound source are present on the left side and right side of two microphones. Then FFT sections (13L and 13R) convert signals of left and right channels on a time region into signals (frequency spectra) on a frequency region through FFT. A comparison section (14) subdivides bands included in the frequency spectra into a plurality of bands, and compares phases of signals in identical subdivided bands between the left and right channels to classify the respective subdivided bands into a first necessary band for separating and extracting the signal of the left sound source, a second necessary band for separating and extracting the signal of the right sound source, and an unnecessary band. The classification result sequence is converted into time-series data. Then respective filter coefficients of FIR filters performing digital filter processing on the signal of the left channel on the time region are updated in steps at sampling time intervals based upon the time-series data. COPYRIGHT: (C)2009,JPO&INPIT
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