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dc.contributor.authorKokkinakis, Kostas
dc.contributor.authorHazrati, Oldooz
dc.contributor.authorLoizou, Philipos C.
dc.date.accessioned2015-04-13T21:28:21Z
dc.date.available2015-04-13T21:28:21Z
dc.date.issued2011-11-05
dc.identifier.citationKokkinakis, 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.en_US
dc.identifier.urihttp://hdl.handle.net/1808/17401
dc.descriptionThis is the published version, also available here: http://dx.doi.org/10.1121/1.3559683.en_US
dc.description.abstractLittle 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.en_US
dc.publisherAcoustical Society of Americaen_US
dc.subjectSpeechen_US
dc.subjectCochlear implantsen_US
dc.subjectspeech intelligibilityen_US
dc.subjectSpeech Analysisen_US
dc.subjectSpeech codingen_US
dc.titleA channel-selection criterion for suppressing reverberation in cochlear implantsen_US
dc.typeArticle
kusw.kuauthorKokkinakis, Kostas
kusw.kudepartmentSpeech-Language-Hearingen_US
dc.identifier.doi10.1121/1.3559683
kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item meets KU Open Access policy criteria.
dc.rights.accessrightsopenAccess


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