DEVICE, METHOD AND PROGRAM FOR SIGNAL ENHANCEMENT, AND DEVICE, METHOD AND PROGRAM FOR SPEECH RECOGNITION

摘要

PROBLEM TO BE SOLVED: To provide speech enhancement technology which is effective even against sudden noise having no noise section and unknown sudden noise. SOLUTION: A signal enhancement device equipped with spectrum subtracting means 13a, 13b, 15 of subtracting a specified reference signal from an input signal containing a target signal and a noise signal, an adaptive filter 14 which is applied to a reference signal, and a coefficient control means of controlling a filter coefficient of the adaptive filter so as to reduce components of the noise signals of the input signal is provided with a database 16 for a signal model representing a specified quantity of the target signal with a specified statistical model, and controls the filter coefficient according to the likelihood of the signal model to the output signal of the spectrum subtracting means. COPYRIGHT: (C)2005,JPO&NCIPI