Phonetic typewriter based on phoneme source modeling

A phonetic typewriter that utilizes the underlying statistical structure of phoneme/character sequences is described. The syllable/character trigram approach to language modeling is adopted to make language source models. These are obtained by calculating trigram probabilities, using a large text database. The phonetic typewriter is tested using 279 phrases uttered by one male speaker, and the syllable source model achieves a 94.9% phoneme recognition rate with the test-set phoneme perplexity of 3.9. Without the syllable trigram, the phoneme recognition rate is only 73.2%. A trigram model based on characters is also evaluated. This model can reduce the phoneme perplexity significantly compared with that of the syllable trigram