Alinha-PB: A Phonetic Aligner for Brazilian Portuguese

Phonetic alignment is the task of finding limits phones and higher units in an audio file. This has been reliably done many languages such as English, French German, but, so far, no available Brazilian Portuguese aligner had a performance comparable with ones used for these other languages. Thus, main goal this work was to implement useful tool forced Portuguese. The implementation two steps, grapheme-to-phoneme conversion itself. Converter responsible receiving input transcription graphemes converting it its equivalent phonemes allophones, implemented using computational rules derived from analysis regular grapheme-phoneme relations exception dictionary, words which could be applied. Aligner aligning phonemes/allophones previous module corresponding acoustic intervals file, called "phones". hidden Markov models. Results have accuracy over 99%, where mistakes involved mid vowels /e/ /ɛ/ /o/ /ɔ/. As Aligner, best model 87% alignments errors below 25 ms.