Evaluation of a spectral subtraction strategy to suppress reverberant energy in cochlear implant devices. J Acoust Soc Am 2015 Jul;138(1):115-24
Date
08/04/2015Pubmed ID
26233012Pubmed Central ID
PMC5392068DOI
10.1121/1.4922331Scopus ID
2-s2.0-84935488613 (requires institutional sign-in at Scopus site) 7 CitationsAbstract
The smearing effects of room reverberation can significantly impair the ability of cochlear implant (CI) listeners to understand speech. To ameliorate the effects of reverberation, current dereverberation algorithms focus on recovering the direct sound from the reverberated signal by inverse filtering the reverberation process. This contribution describes and evaluates a spectral subtraction (SS) strategy capable of suppressing late reflections. Late reflections are the most detrimental to speech intelligibility by CI listeners as reverberation increases. By tackling only the late part of reflections, it is shown that users of CI devices can benefit from the proposed strategy even in highly reverberant rooms. The proposed strategy is also compared against an ideal reverberant (binary) masking approach. Speech intelligibility results indicate that the proposed SS solution is able to suppress additive reverberant energy to a degree comparable to that achieved by an ideal binary mask. The added advantage is that the SS strategy proposed in this work can allow for a potentially real-time implementation in clinical CI processors.
Author List
Kokkinakis K, Runge C, Tahmina Q, Hu YAuthor
Christina Runge PhD Associate Provost, Chief, Professor in the Otolaryngology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Acoustic StimulationAcoustics
Adolescent
Adult
Aged
Algorithms
Cochlear Implants
Facility Design and Construction
Female
Hearing Loss, Sensorineural
Humans
Male
Middle Aged
Perceptual Masking
Phonetics
Sound
Speech Intelligibility
Speech Perception
Subtraction Technique
Wavelet Analysis
Young Adult
