J Audiol Otol.
2018 Jan;22(1):28-38. 10.7874/jao.2017.00178.
Frequency-Limiting Effects on Speech and Environmental Sound Identification for Cochlear Implant and Normal Hearing Listeners
- Affiliations
-
- 1Department of Otolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Korea.
- 2Department of Audiology and Speech Pathology, University of Tennessee Health Science Center, Knoxville, TN, USA. jhwon15@gmail.com
- 3Graduate Program of Speech and Language Pathology, Department and Research Institute of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Korea.
- 4Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA, USA.
- 5Department of Otolaryngology-Head and Neck Surgery, Gachon University Gil Medical Center, Incheon, Korea.
- KMID: 2428999
- DOI: http://doi.org/10.7874/jao.2017.00178
Abstract
- BACKGROUND AND OBJECTIVES
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.
SUBJECTS AND METHODS
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.
RESULTS
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.
CONCLUSIONS
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.
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