Development of Japanese infant speech database using longitudinal recordings from birth to five years old

Previously developed longitudinal infant speech databases are limited in terms of recording period or number of utterances. To facilitate longitudinal research on the development of speech production, an infant speech database was developed by using five years of recordings containing a large number of daily life utterances of five Japanese infants and their parents. The resulting database contains 269,467 utterances with various types of information including a transcription, a fundamental frequency, and a phoneme label. The database is useful for both acoustical and linguistic analyses of speech development.