ISCA International Workshop on Speech and Language Technology in Education (SLaTE 2011)
In order to make a CALL system to detect lexical pitch accent
errors, we are developing a multi-level pitch pattern recognition
algorithm. With this method, it is possible to detect a wider
range of pitch accent errors than with previous methods and it is
possible to have more flexibility in displaying the pitch pattern
to the learner. This rule-based method is based on perceptual
experiments in which we made use of speech synthesis to manipulate
the pitch of utterances to perform quantitative analysis
on accent perception. The recognition is based on two-mora
units and the local pitch level pattern for those units. By combining
the local pitch level patterns for a word it is possible to
derive the two level pitch pattern for the word and also provide
a variety of ways to display the word to the language learner.
The average agreement rate with the labeling for these units was
75% in the case of the Japanese database and 66% in the case
of the non-Japanese database.
Index Terms. Japanese pitch accent, classification, perception, CALL system
Bibliographic reference. Short, Greg / Hirose, Keikichi / Minematsu, Nobuaki (2011): "Rule-based method for pitch level classification for a Japanese pitch accent CALL system", In SLaTE-2011, 45-48.