ERIC Number: ED072608
Record Type: RIE
Publication Date: 1973
Research on Frequency Transposition for Hearing Aids. Final Report.
Gengel, Roy W.; Pickett, J. M.
Reported were studies measuring residual auditory capacities of deaf persons and investigating hearing aids which transpose speech to lower frequencies where deaf persons may have better hearing. Studies on temporal and frequency discrimination indicated that the duration of a signal may have a differential effect on its detectability by sensorineural hearing-impaired persons compared to normal, but that temporal effects on frequency discrimination and perception of temporal order seem normal, and therefore provide scant explanation of low speech discrimination abilities. Problems involved in doing research with long-term hearing impaired Ss were identified. Studies of speech pattern perception yielded the following conclusions: sensorineural hearing-impaired listeners have better residual reception for low-frequency speech patterns than the middle- and high-frequency patterns; and the superiority of low-frequency pattern reception holds over a rather wide range of degrees and types of sensorineural impairment. Data was reported concerning the hypothesis that acoustic transposition of phonemic differences could make them indistinguishable at least until discrimination could be retrained. Also presented were data showing that speech discrimination performance is higher for transposer amplification than for conventional amplification. Theoretical aspects of frequency transposition were discussed. (GW)
Publication Type: N/A
Education Level: N/A
Sponsor: Bureau of Education for the Handicapped (DHEW/OE), Washington, DC.
Authoring Institution: Gallaudet Coll., Washington, DC.