Lexical acquisition apparatus, multi dialogue behavior system, and lexical acquisition program

Abstract

A lexical acquisition apparatus includes: a phoneme recognition sectionfor preparing a phoneme sequence candidate from an inputted speech; a word matching sectionfor preparing a plurality of word sequences based on the phoneme sequence candidate; a discrimination sectionfor selecting, from among a plurality of word sequences, a word sequence having a high likelihood in a recognition result; an acquisition sectionfor acquiring a new word based on the word sequence selected by the discrimination section; a teaching word listA used to teach a name; and a probability modelB of the teaching word and an unknown word, wherein the discrimination sectioncalculates, for each word sequence, a first evaluation value showing how much words in the word sequence correspond to teaching words in the listA and a second evaluation value showing a probability at which the words in the word sequence are adjacent to one another and selects a word sequence for which a sum of the first evaluation value and the second evaluation value is maximum, and wherein the acquisition sectionacquires, as a new word, a word in the word sequence selected by the discrimination section that is not involved in the calculation of the first evaluation value.