Recognition of speaker-dependent continuous speech with KEAL

A description of the speaker-dependent continuous speech recognition system KEAL is given. An unknown utterance is recognised by means of the following procedures: acoustic analysis, phonetic segmentation and identification, word and sentence analysis. The combination of feature-based speaker-independent coarse phonetic segmentation with speaker-dependent statistical classification techniques is one of the main design features of the acoustic-phonetic decoder. The lexical access component is essentially based on a statistical dynamic programming technique which aims at matching a phonemic lexical entry containing various phonological forms, against a phonetic lattice. Sentence recognition is achieved by use of a context-free grammar and a parsing algorithm derived from Earley´s parser. A speaker adaptation module allows some of the system parameters to be adjusted by matching known utterances with their acoustical representation. The task to be performed, described by its vocabulary and its grammar, is given as a parameter of the system. Continuously spoken sentences extracted from a ´pseudo-logo´ language are analysed and results are presented.