Reproducing Styli for Speech Audiometry Between 1956 and 1958, Technisonic Studios changed the groove shape on the lateral-cut monophonic recordings that they supply for speech audiometry. A stylus that has a spherical tip with a radius of 1/1000 inch (1.0 mil) is the most appropriate one for reproducing (playing) Technisonic discs pressed since 1959. The ... Research Article
Research Article  |   December 01, 1968
Reproducing Styli for Speech Audiometry
 
Author Affiliations & Notes
  • David J. Lilly
    University of Iowa, Iowa City, Iowa
  • Richard L. Franzen
    University of Iowa, Iowa City, Iowa
Article Information
Research Articles
Research Article   |   December 01, 1968
Reproducing Styli for Speech Audiometry
Journal of Speech, Language, and Hearing Research, December 1968, Vol. 11, 817-824. doi:10.1044/jshr.1104.817
History: Received March 25, 1968
 
Journal of Speech, Language, and Hearing Research, December 1968, Vol. 11, 817-824. doi:10.1044/jshr.1104.817
History: Received March 25, 1968

Between 1956 and 1958, Technisonic Studios changed the groove shape on the lateral-cut monophonic recordings that they supply for speech audiometry. A stylus that has a spherical tip with a radius of 1/1000 inch (1.0 mil) is the most appropriate one for reproducing (playing) Technisonic discs pressed since 1959. The tone arms on many speech audiometers, however, still are equipped with a larger (2.5 mil) stylus. This report presents a rationale for using the 1.0-mil stylus. Methods are suggested for identification of groove shape on the Technisonic discs and for identification of stylus size.

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