| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise suppression technology which suppresses an unsteady noise signal with respect to an input signal.SOLUTION: Input signal spectral information and sound feature quantity used for parameter estimation of a noise model are extracted from an input signal by using a soundless model and a voice model; a noise model parameter of a noise model and a speaker adaptation parameter dependent on a speaker are estimated by using the sound feature quantity, the soundless model and the voice model; a noise suppression filter is estimated by using the sound feature quantity, the soundless model, the voice model, the noise model parameter and the speaker adaptation parameter; and a target signal is output by applying the noise suppression filter to the spectral information. The noise model is expressed as a weighting mixed probability distribution, and a posterior probability used for the estimation of the noise model parameter and the speaker adaptation parameter is estimated by marginalizing the soundless model, the weighting mixed probability distribution of the input signal acquired by synthesizing the sound model and the noise model, and a posterior probability acquired from the input signal. |
