Patent ID: 6067513
Filing Date: 2000-05-23
Classification: G10L

Abstract:
A speech recognition method of recognizing an input speech in a noisy environment by using a plurality of clean speech models, each of said clean speech models having a clean speech feature parameter S representing a cepstrum parameter of a clean speech thereof, said speech recognition method comprising the processes of:detecting a noise feature parameter N representing a cepstrum parameter of a noise in said noisy environment, immediately before said input speech is input;detecting an input speech feature parameter X representing a cepstrum parameter of said input speech in said noisy environment;calculating a modified clean speech feature parameter Y according to a following equation:Y=k.multidot.S+(1-k).multidot.N (0<k.ltoreq.1),where said ""k"" is a predetermined value corresponding to a signal-to-noise ratio in said noise environment;comparing said input speech feature parameter X with said modified clean speech feature parameter Y; andrecognizing said input speech by repeatedly carrying out said calculating process and said comparing process, respectively, with respect to said plurality of clean speech models.