Enhancement of Word-Recognition Performance With a Filtering Technique The NU No. 6 materials spoken by a female speaker were passed through a notch filter centered at 247 Hz with a 34-dB depth The filtering reduced the amplitude range within the spectrum of the materials by 10 dB that was reflected as a 7.5-vu reduction measured on a true ... Research Note
Research Note  |   December 01, 1991
Enhancement of Word-Recognition Performance With a Filtering Technique
 
Author Affiliations & Notes
  • Richard H. Wilson
    VA Medical Center Long Beach, CA and University of California, Irvine
  • John P. Preece
    VA Medical Center Long Beach, CA and University of California, Irvine
  • Courtney S. Crowther
    VA Medical Center Long Beach, CA and University of California, Irvine
  • Requests for reprints should be sent to Richard H. Wilson, PhD, Audiology-126, VA Medical Center, 5901 E. 7th Street, Long Beach, CA 90822.
Article Information
Hearing / Research Note
Research Note   |   December 01, 1991
Enhancement of Word-Recognition Performance With a Filtering Technique
Journal of Speech, Language, and Hearing Research, December 1991, Vol. 34, 1436-1438. doi:10.1044/jshr.3406.1436
History: Received August 20, 1990 , Accepted November 28, 1990
 
Journal of Speech, Language, and Hearing Research, December 1991, Vol. 34, 1436-1438. doi:10.1044/jshr.3406.1436
History: Received August 20, 1990; Accepted November 28, 1990

The NU No. 6 materials spoken by a female speaker were passed through a notch filter centered at 247 Hz with a 34-dB depth The filtering reduced the amplitude range within the spectrum of the materials by 10 dB that was reflected as a 7.5-vu reduction measured on a true vu meter. Thus, the notch filtering in effect changed the level calibration of the materials. Psychometric functions of the NU No. 6 materials filtered and unfiltered in 60-dB SPL broadband noise were obtained from 12 listeners with normal hearing. Although the slopes of the functions for the two conditions were the same, the functions were displaced by an average of 5 8 dB with the function for the filtered materials located at the lower sound-pressure levels.

Acknowledgments
Support for this project was provided by the Medical Research Service, Department of Veterans Affairs, Washington, DC. Appreciation is expressed to Gerald Studebaker and an anonymous reviewer for their suggestions.
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