Speech recognition device, speech recognition method, and computer readable medium

Abstract

The present invention can increase the types of noises that can be dealt with enough to enable speech recognition with a speech recognition rate of high accuracy. A speech recognition device of the present invention performs processes of: storing, in a manner to relate them to each other, a suppression coefficient representing a noise suppression amount and an adaptation coefficient representing an adaptation amount of a noise model, where the noise model is generated on the basis of a predetermined noise and is to be compounded (synthesized) to a clean acoustic model generated on the basis of a voice including no noise; estimating noise from an input signal; suppressing from the input signal a portion of the estimated noise of an amount specified by a suppression amount specified on the basis of the suppression coefficient; generating an adapted acoustic model which is noise-adapted, by compounding (synthesizing) the clean acoustic model with a noise model generated on the basis of the estimated noise in accordance with an adaptation amount specified on the basis of the adaptation coefficient; and recognizing voice on the basis of the noise-suppressed input signal and the generated adapted acoustic model.