Japanese linguistic processing for continuous speech recognition

A Japanese text input system using speech, which is now under development, is described. This system recognizes continuous phrase speech and translates it into Japanese text. This system is composed of two major parts, acoustic processing and linguistic processing. In the acoustic processing CV (consonant-vowel) syllables and words in continuous speech are detected by continuous dynamic programming (DP). As the result a CV lattice and a word lattice are obtained. In the linguistic processing, the CV lattice and word lattice are converted into written form. In the conversion process the word lattice is used in combination with the CV lattice to improve translation accuracy. A CV recognition accuracy of 63-83 % and a translation accuracy of 38-62 % was obtained as an experimental result.