| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise removing device which has high noise removal precision and generates a less-distorted signal after processing. SOLUTION: The noise removing device 180 includes a framing processing part 200 which frames a speech signal 182 and calculates acoustic spectra by frames, a noise spectrum estimation part 202 and a spectrum subtraction part 204 that estimate noise spectra included in the acoustic spectra of the respective frames and subtract them from the respective frames, a masking threshold calculation part 208 which calculates a frequency-axis directional masking threshold for the acoustic spectra of the respective frames outputted by the framing processing part 200, and a time-axis directional smoothing processing part 206 and a frequency directional smoothing processing part 210 that smoothes the acoustic spectra by the frames outputted from the spectrum subtraction part 204 in both the time-axis direction and frequency-axis direction by using the masking threshold and the acoustic spectrum of the frame right before a frame to be processed. COPYRIGHT: (C)2005,JPO&NCIPI
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