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    A channel-selection criterion for suppressing reverberation in cochlear implants

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    Kokkinakis_JASA_2011(129)3221.pdf (812.0Kb)
    Issue Date
    2011-11-05
    Author
    Kokkinakis, Kostas
    Hazrati, Oldooz
    Loizou, Philipos C.
    Publisher
    Acoustical Society of America
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Little is known about the extent to which reverberation affects speech intelligibility by cochlear implant (CI) listeners. Experiment 1 assessed CI users’ performance using Institute of Electrical and Electronics Engineers (IEEE) sentences corrupted with varying degrees of reverberation. Reverberation times of 0.30, 0.60, 0.80, and 1.0 s were used. Results indicated that for all subjects tested, speech intelligibility decreased exponentially with an increase in reverberation time. A decaying-exponential model provided an excellent fit to the data. Experiment 2 evaluated (offline) a speech coding strategy for reverberation suppression using a channel-selection criterion based on the signal-to-reverberant ratio (SRR) of individual frequency channels. The SRR reflects implicitly the ratio of the energies of the signal originating from the early (and direct) reflections and the signal originating from the late reflections. Channels with SRR larger than a preset threshold were selected, while channels with SRR smaller than the threshold were zeroed out. Results in a highly reverberant scenario indicated that the proposed strategy led to substantial gains (over 60 percentage points) in speech intelligibility over the subjects’ daily strategy. Further analysis indicated that the proposed channel-selection criterion reduces the temporal envelope smearing effects introduced by reverberation and also diminishes the self-masking effects responsible for flattened formants.
    Description
    This is the published version, also available here: http://dx.doi.org/10.1121/1.3559683.
    URI
    http://hdl.handle.net/1808/17401
    DOI
    https://doi.org/10.1121/1.3559683
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    • Speech-Language-Hearing Scholarly Works [81]
    Citation
    Kokkinakis, Kostas., Hazati, Oldooz., Loizou, Philipos. "A channel-selection criterion for suppressing reverberation in cochlear implants." J. Acoust. Soc. Am. 129, 3221 (2011); http://dx.doi.org/10.1121/1.3559683.

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    1425 Jayhawk Blvd
    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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