APPARATUS AND METHOD FOR ESTIMATING SPECTRAL SHAPE FEATURE QUANTITY OF SIGNAL FOR EVERY SOUND SOURCE, AND APPARATUS, METHOD AND PROGRAM FOR ESTIMATING SPECTRAL FEATURE QUANTITY OF TARGET SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a technique for estimating a spectral shape feature quantity of a signal for every sound source, thereby efficiently performing a spectral estimation of a target sound, even using a model in which spectral values have correlation between frequencies.;SOLUTION: A prior probability density function (a spectral shape model) of a spectral shape feature quantity corresponding to each sound source, and a conditioned probability density function (a spectral observation model) of the spectral feature quantity when the spectral shape feature quantity is given are used. An optimization function is represented by a product of the conditioned probability density function of the spectral shape feature quantity which has, in a latent variable, an occupancy sound source number representing a sound source of an acoustic signal having maximal energy in each time frequency point and to which the spectral shape feature quantities of all sound sources are given, and the prior probability density function of the spectral shape feature quantity determined for every sound source. The optimization function is maximized by using the spectral shape model and the spectral observation model, to estimate the spectral shape feature quantity for every sound and a sound source occupancy.;COPYRIGHT: (C)2013,JPO&INPIT