Abstract
The Priciple, the construction, the performance, and the characteristics of three kinds of visual speech trainers are summarized, which were developed for hard of hearing children. Those trainers, that is a 2-dimensional pitch-intensity indicator, an articulatory trainer of vowels and an intonation indicator, have CRT with a large screen(11''), and speech parameters are indicated as information of position on the screen. As the internal condition of the devices is automatically controlled to fit input speech, the speech parameters can accurately be extracted and the trainers can easily be operated. Finally, discussions are made for further development of the trainers reported in this paper, and new systems of speech trainers are proposed. By use of those trainers, speech parameters increase in number which we can transmit at once to hard of hearing children.
