Sound Pressure in Ear Canals Modified by Surgery This two-part study measured sound pressure using a probe tube microphone in normal and surgically altered ear canals. In the first study sound was generated by a TDH-39 earphone in 24 normal ears and 21 ears exposed to radical mastoidectomy and Type III or IV tympanoplasty. Considered as groups the ... Research Article
Research Article  |   June 01, 1970
Sound Pressure in Ear Canals Modified by Surgery
 
Author Affiliations & Notes
  • William Melnick
    Ohio State University, Columbus, Ohio
Article Information
Research Articles
Research Article   |   June 01, 1970
Sound Pressure in Ear Canals Modified by Surgery
Journal of Speech, Language, and Hearing Research, June 1970, Vol. 13, 400-417. doi:10.1044/jshr.1302.400
History: Received August 18, 1969
 
Journal of Speech, Language, and Hearing Research, June 1970, Vol. 13, 400-417. doi:10.1044/jshr.1302.400
History: Received August 18, 1969

This two-part study measured sound pressure using a probe tube microphone in normal and surgically altered ear canals. In the first study sound was generated by a TDH-39 earphone in 24 normal ears and 21 ears exposed to radical mastoidectomy and Type III or IV tympanoplasty. Considered as groups the two types of ears showed little difference in measured sound pressure. The most remarkable observation was a sharp minimum in sound pressure which occurred at the 2000–3000 Hz range in the surgically altered ears but was not seen in the normal ears. The second study measured sound pressure deep in the canal and also at the canal entrance of 20 normal ears and 20 surgical ears in a sound field. The main effect was a shift in observed maxima and minima of sound pressure to lower frequencies in the surgically altered ears indicating an increase in the effective length of the canal. Changes in sound pressure were difficult to isolate audiometrically. The effects of surgery might be expected to influence audiometric results at frequencies above 2000 Hz.

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