VITERBI DECODER AND A METHOD FOR RECOGNIZING A VOICE, PARTICULARLY FOR STABLY MAINTAINING A STABLE RECOGNITION FUNCTION EVEN WHEN A VOICE SIGNAL IS CONTAMINATED BY A NOISE

摘要

PURPOSE: A viterbi decoder and a method for recognizing a voice are provided to prevent the dramatic lowering of an observation probability of a contaminated portion caused by an unintended impulse noise.;CONSTITUTION: An optimal state calculator(220) obtains the state of the maximum accumulated similarity in each measurement vector of an observation vector row for the inputted voice. A buffer unit(240) stores an observation probability value for the plural voices inputted prior to the inputted voice. A non-linear filtering unit(250) calculates the observation probability value based on the observation probability value calculated by an observation probability calculator(230). A maximum similarity producer(260) calculates a local maximum similarity value based on the observation probability value.;COPYRIGHT KIPO 2010