High- and Low-Frequency Decrement Contribution to Spectral Enhancement Purpose The relative benefit of a single, flanking, high- or low-frequency decrement was assessed to better understand properties of spectral enhancement that may aid in algorithm design. Method Detection thresholds were measured for intensity increments applied to a narrow target band of frequencies embedded in a broadband signal ... Research Article
Research Article  |   September 01, 2015
High- and Low-Frequency Decrement Contribution to Spectral Enhancement
 
Author Affiliations & Notes
  • Jeffrey J. DiGiovanni
    Ohio University, Athens
  • Travis L. Riffle
    Ohio University, Athens
  • Naveen K. Nagaraj
    UALR Speech and Hearing Clinic, Little Rock, AR
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Jeffrey J. DiGiovanni: digiovan@ohio.edu
  • Editor and Associate Editor: Larry Humes
    Editor and Associate Editor: Larry Humes×
Article Information
Hearing Disorders / Speech, Voice & Prosody / Research Articles
Research Article   |   September 01, 2015
High- and Low-Frequency Decrement Contribution to Spectral Enhancement
American Journal of Audiology, September 2015, Vol. 24, 432-439. doi:10.1044/2015_AJA-14-0087
History: Received December 18, 2014 , Revised April 27, 2015 , Accepted May 17, 2015
 
American Journal of Audiology, September 2015, Vol. 24, 432-439. doi:10.1044/2015_AJA-14-0087
History: Received December 18, 2014; Revised April 27, 2015; Accepted May 17, 2015

Purpose The relative benefit of a single, flanking, high- or low-frequency decrement was assessed to better understand properties of spectral enhancement that may aid in algorithm design.

Method Detection thresholds were measured for intensity increments applied to a narrow target band of frequencies embedded in a broadband signal while 400-Hz-wide, 9- or 12-dB-deep intensity decrements were placed above, below, or on both sides of the target band. A mono condition with no decrements was used as a control. Eight participants with normal hearing and 8 participants with hearing impairment took part in this experiment.

Results Performance improved in the presence of decrements for both groups and was equivalent for both high- or low-frequency decrements. Comparison with individually measured auditory filters revealed that participants with normal hearing made use of energy cues available within these filters, whereas some participants with hearing impairment, despite improved increment detection, underutilized this information.

Conclusion Inclusion of a single, adjacent, high- or low-frequency decrement improved increment detection but not to the same extent as when decrements flanked both sides.

Acknowledgment
This study was funded by an American Speech-Language-Hearing Foundation Research Grant awarded to Jeffrey J. DiGiovanni.
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