Recent research on speech-analyzing aids for the deaf

The problem of acoustic transmission of speech sounds to the deaf is reviewed. Then some methods of speech analysis are described which have been developed as prototypes of new speech aids. Three types of new aids are covered: 1) aids intended for improving speech reception by recoding or transposing speech sounds into residual hearing ranges, 2) tactual aids to speech communication, and 3) visual aids to supplement speech reception, or for monitoring of speech in speech training.