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Companding to improve cochlear-implant speech recognition in speech-shaped noisea)
a)Portions of this work were presented in “Companding to improve cochlear implants’ speech processing in noise,” 2005 Conference on Implantable Auditory Prosthesis, Asilomar Conference Center, Pacific Grove, California, August 2005.
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10.1121/1.2749710
/content/asa/journal/jasa/122/2/10.1121/1.2749710
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/2/10.1121/1.2749710

Figures

Image of FIG. 1.
FIG. 1.

Detailed architecture of a single channel. ED-envelope detector.

Image of FIG. 2.
FIG. 2.

Spectra of the vowel /hid/ as a function of the number of channels . Lighter traces correspond to the original stimuli and the darker traces represent the stimuli after companding.

Image of FIG. 3.
FIG. 3.

Spectra of the vowel /hid/ as a function of time constant of the envelope detectors . Lighter traces correspond to the original stimuli and the darker traces represent the stimuli after companding.

Image of FIG. 4.
FIG. 4.

Temporal wave forms of the vowel /hid/ before and after companding.

Image of FIG. 5.
FIG. 5.

Spectra of the vowel /hid/ in steady-state speech-spectrum-shaped noise at different SNRs. Lighter traces correspond to the original stimuli and the darker traces represent the stimuli after companding.

Image of FIG. 6.
FIG. 6.

(a) Spectra of the initial vowel part of the consonant /aFa/. (b) Spectra of the consonant part following the initial vowel part. Lighter traces correspond to the original stimuli and the darker traces represent the stimuli after companding. (c), (d) Temporal wave forms of the same consonant before and after companding, respectively.

Image of FIG. 7.
FIG. 7.

Phoneme and sentence recognition scores for the NH subjects. Left panels show average percent correct scores and the right panels show average increase in the percent correct scores. Left panel: Circled traces represent the stimuli without CI simulation, whereas the inverted triangular traces correspond to the CI simulated stimuli. Open symbols correspond to the original stimuli and the filled symbols correspond to the stimuli after companding. Right panel: Filled inverted triangular traces correspond to the CI simulated stimuli and the open circular traces correspond to the stimuli without CI simulation. Vertical bars represent the standard errors.

Image of FIG. 8.
FIG. 8.

Phoneme and sentence recognition scores for the CI users. C1 to C5 - Nucleus 24 users, C6 and C7 - Clarion II users. Upper, middle and the bottom panels show scores on vowel, consonant and sentence recognition tests, respectively. Open circles correspond to the original stimuli and the filled circles correspond to stimuli after companding.

Image of FIG. 9.
FIG. 9.

Average percent correct scores and the average increase in percent correct scores for the CI subjects. Left panel: Open symbols correspond to the original stimuli and the filled symbols correspond to the stimuli after companding. Vertical bars represent the standard errors.

Tables

Generic image for table
TABLE I.

Detailed information of the cochlear implant users.

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/content/asa/journal/jasa/122/2/10.1121/1.2749710
2007-08-01
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Companding to improve cochlear-implant speech recognition in speech-shaped noisea)
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/2/10.1121/1.2749710
10.1121/1.2749710
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