Frequency-Limiting Effects on Speech and Environmental Sound Identification for Cochlear Implant and Normal Hearing Listeners

Son-A Chang; Jong Ho Won; HyangHee Kim; Seung-Ha Oh; Richard S Tyler; Chang Hyun Cho

doi:10.7874/jao.2017.00178

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Frequency-Limiting Effects on Speech and Environmental Sound Identification for Cochlear Implant and Normal Hearing Listeners

Journal article

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Frequency-Limiting Effects on Speech and Environmental Sound Identification for Cochlear Implant and Normal Hearing Listeners

Son-A Chang, Jong Ho Won, HyangHee Kim, Seung-Ha Oh, Richard S Tyler and Chang Hyun Cho

Journal of audiology & otology, Vol.22(1), pp.28-38

12/2017

DOI: 10.7874/jao.2017.00178

PMCID: PMC5784366

PMID: 29325391

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Abstract

It is important to understand the frequency region of cues used, and not used, by cochlear implant (CI) recipients. Speech and environmental sound recognition by individuals with CI and normal-hearing (NH) was measured. Gradients were also computed to evaluate the pattern of change in identification performance with respect to the low-pass filtering or high-pass filtering cutoff frequencies. Frequency-limiting effects were implemented in the acoustic waveforms by passing the signals through low-pass filters (LPFs) or high-pass filters (HPFs) with seven different cutoff frequencies. Identification of Korean vowels and consonants produced by a male and female speaker and environmental sounds was measured. Crossover frequencies were determined for each identification test, where the LPF and HPF conditions show the identical identification scores. CI and NH subjects showed changes in identification performance in a similar manner as a function of cutoff frequency for the LPF and HPF conditions, suggesting that the degraded spectral information in the acoustic signals may similarly constraint the identification performance for both subject groups. However, CI subjects were generally less efficient than NH subjects in using the limited spectral information for speech and environmental sound identification due to the inefficient coding of acoustic cues through the CI sound processors. This finding will provide vital information in Korean for understanding how different the frequency information is in receiving speech and environmental sounds by CI processor from normal hearing.

Cochlear implant

Environmental sound

Cross-over frequency

Frequency information

Korean speech sound

Details

Title: Subtitle: Frequency-Limiting Effects on Speech and Environmental Sound Identification for Cochlear Implant and Normal Hearing Listeners
Creators: Son-A Chang - Department of Otolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Korea
Jong Ho Won - Department of Audiology and Speech Pathology, University of Tennessee Health Science Center, Knoxville, TN, USA
HyangHee Kim - Graduate Program of Speech and Language Pathology, Department and Research Institute of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Korea
Seung-Ha Oh - Department of Otolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Korea
Richard S Tyler - Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
Chang Hyun Cho - Department of Otolaryngology-Head and Neck Surgery, Gachon University Gil Medical Center, Incheon, Korea
Resource Type: Journal article
Publication Details: Journal of audiology & otology, Vol.22(1), pp.28-38
DOI: 10.7874/jao.2017.00178
PMID: 29325391
PMCID: PMC5784366
NLM abbreviation: J Audiol Otol
ISSN: 2384-1621
eISSN: 2384-1710
Publisher: Korea (South)
Language: English
Date published: 12/2017
Academic Unit: Communication Sciences and Disorders; Otolaryngology
Record Identifier: 9984002485702771

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