Abstract
A two-dimensional vowel chart has been used in the presentation of the articulatory positions of eight Finnish vowels produced by deaf subjects. The method and its evaluation is presented, showing individual analyses of a 13-year-old deaf boy. The values of the two lowest formants were determined from the real-time spectral analyses of each finnish vowel and their positions on the vowel diagram, and these are compared with the identifications by listeners with normal hearing. Although the distortion and fuzziness of vowel spectra caused some difficulties in the exact determination of formant values, the comparison showed a fairly high validity for the method. This kind of vowel chart can be used for the estimation of individual articulatory capacity of deaf subjects.