| 摘要 |
PROBLEM TO BE SOLVED: To stably suppress a noise component and musical noise by using a spectrum subtraction method, even in an input signal of a low S/N ratio. SOLUTION: This noise suppressing device estimates a sound signal power spectrum ¾Sn(ω)¾<SP>2</SP>and a noise signal power spectrum ¾Wn(ω)¾<SP>2</SP>from an input signal spectrum Xn(ω) which is converted to a frequency domain, and generates a compressed sound signal power spectrum ¾SSn(ω)¾<SP>2</SP>, by compressing level variation of the spectrum of an average noise level or less in the voice signal power spectrum to a fixed width or less, in a musical noise suppression section 15. In a noise attenuation coefficient creation section 16, a noise attenuation coefficient Hn(ω) is generated based on the compressed voice signal power spectrum and the noise signal poser spectrum. In a noise suppressing section 17, an output signal spectrum Yn(ω) is generated by multiplying the noise attenuation coefficient by the input signal spectrum. COPYRIGHT: (C)2010,JPO&INPIT |
