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Effects of upper-frequency boundary and spectral warping on speech intelligibility in electrical stimulation
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10.1121/1.2831738
/content/asa/journal/jasa/123/4/10.1121/1.2831738
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/4/10.1121/1.2831738

Figures

Image of FIG. 1.
FIG. 1.

Different frequency-to-tonotopic place mappings used in this experiment. Panel (a) shows the baseline condition , where frequencies of the speech signal are mapped to 12 channels, essentially the same as the normal clinical mapping. Panel (b) shows the condition, a matched condition where the spectral content is low-pass filtered, but unwarped from the normal clinical mapping. Panel (c) shows a compression of full spectral content to a limited set of 6 channels. Panel (d) shows an expansion of limited spectral content to a full set of 12 channels.

Image of FIG. 2.
FIG. 2.

An illustrative matrix of conditions tested in experiment 1. In total there are 18 different conditions tested, which vary the upper-frequency boundary index or the number of channels .

Image of FIG. 3.
FIG. 3.

(Color online) Percent correct scores as a function of matched channels for five high-performance CI listeners (upper-left panel), six NH listeners (upper-right panel), and two low-performance CI listeners (bottom panels). The upper panels have errors bars that are two standard deviations in length.

Image of FIG. 4.
FIG. 4.

(Color online) Percent correct scores relative to the matched conditions (shown by the vertical dotted line) vs the number of channels for a fixed upper-frequency boundary and spectral content . Open symbols show no significant difference from the matched case. Closed symbols show a significant difference from the matched case . The matched case was often the best case. Significant decreases were seen for changes of more than two channels from the matched cases.

Image of FIG. 5.
FIG. 5.

(Color online) Percent correct scores relative to the matched condition (shown by the vertical dotted line) vs the amount of spectral content for a fixed channel number . Open symbols show no significant difference from the matched case. Closed symbols show a significant difference from the matched case. The matched case was often the best case. Significant decreases were seen for changes of more than two frequency boundary indices from the matched cases.

Image of FIG. 6.
FIG. 6.

(Color online) Results from experiment 2 showing percent correct vs session number averaged over three NH listeners. Session 0 contains the baseline data from experiment 1. Sessions 1–8 are from experiment 2.

Tables

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TABLE I.

Center frequency, bandwidth, and octave shift for each band for each combination of and .

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TABLE II.

Bibliographic data of the CI listeners.

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TABLE III.

Percent correct differences between the baseline condition and the other conditions averaged over all four SNRs. The values were found from Tukey’s post-hoc tests from a three-way RM ANOVA. Values not different from the baseline are marked in bold.

Generic image for table
TABLE IV.

Comparison of the performance in percent correct between the baseline condition and the extended frequency range condition for all four SNRs. The values were found by one-way RM ANOVAs.

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/content/asa/journal/jasa/123/4/10.1121/1.2831738
2008-04-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of upper-frequency boundary and spectral warping on speech intelligibility in electrical stimulation
http://aip.metastore.ingenta.com/content/asa/journal/jasa/123/4/10.1121/1.2831738
10.1121/1.2831738
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