Speech training systems using the lateral shape of the vocal tract and an F1−F2 diagram for hearing-impaired children
Minoru Shigenaga, Y. Sekiguchi · The Journal of the Acoustical Society of America · 1978
Three speech training systems for hearing-impaired children were designed and constructed using a minicomputer and a microprocessor. The first system displays the lateral shape of the vocal tract for each vowel estimated from the speech sound. In this system, three storages are prepared. One of them can be used to store a reference shape which may be estimated from a teacher's voice or a prepared standard shape. A child can articulate seeing the reference shape and rearticulate comparing his own first articulation with the reference shape. The second system displays successively the lateral shapes for articulation of any phoneme sequences containing consonants. The lateral shapes for Japanese phoneme sequences are synthesized by a speech synthesizer using an articulatory model. The third system displays the first two formant frequencies extracted from speech as a spot on the F1−F2 plane, where the regions of vowels are also shown. Preliminary use of these devices has shown that they complement each other to form an effective system of speech training.