Real Ear Compression Ratios The Effects of Venting and Adaptive Release Time Research Article
Research Article  |   July 01, 1997
Real Ear Compression Ratios
 
Author Affiliations & Notes
  • Todd W. Fortune, PhD
    Argosy Electronics, 10300 West 70th Street, Eden Prairie, MN 55344
  • Portions of this paper were presented at the American Academy of Audiology annual convention in Salt Lake City in April 1996.
    Portions of this paper were presented at the American Academy of Audiology annual convention in Salt Lake City in April 1996.×
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Special Populations / Genetic & Congenital Disorders / Speech, Voice & Prosody / Research Articles
Research Article   |   July 01, 1997
Real Ear Compression Ratios
American Journal of Audiology, July 1997, Vol. 6, 55-63. doi:10.1044/1059-0889.0602.55
History: Received July 15, 1996 , Accepted May 15, 1997
 
American Journal of Audiology, July 1997, Vol. 6, 55-63. doi:10.1044/1059-0889.0602.55
History: Received July 15, 1996; Accepted May 15, 1997

An investigation was conducted to determine the effects of vent diameter, stimulus characteristics, and adaptive release time on the real ear compression ratio (CR). Real ear input/output (I/O) functions generated in response to syllables and speech-shaped noise revealed that the real ear CR is often less than the nominal value measured in the coupler, but only for CRs greater than 2:1. Results were similar across all vents except IROS, a condition that resulted in much larger errors than smaller vents. Pooled across vents, CRs of individual phonemes were found to be associated with phoneme duration, crest factor, and the interval of time between phonemes. Results were also influenced by an adaptive release time, which may have affected the compression of vowels and consonants differently.

Acknowledgment
The author wishes to thank Robert Turner and two anonymous reviewers for providing valuable comments and suggestions regarding this work.
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