Benefits of amplification for speech recognition in background noise

Turner, Christopher W. and Henry, Belinda A. (2002) Benefits of amplification for speech recognition in background noise. The Journal of the Acoustical Society of America, 112 4: 1675-1680. doi:10.1121/1.1506158

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Author Turner, Christopher W.
Henry, Belinda A.
Title Benefits of amplification for speech recognition in background noise
Journal name The Journal of the Acoustical Society of America   Check publisher's open access policy
ISSN 0001-4966
1520-8524
Publication date 2002-10-01
Year available 2002
Sub-type Article (original research)
DOI 10.1121/1.1506158
Open Access Status File (Publisher version)
Volume 112
Issue 4
Start page 1675
End page 1680
Total pages 6
Place of publication Melville, NY, United States
Publisher A I P Publishing LLC
Language eng
Subject 320705 Sensory Systems
321025 Rehabilitation and Therapy - Hearing and Speech
380302 Linguistic Processes (incl. Speech Production and Comprehension)
Abstract The purpose of the present study was to examine the benefits of providing audible speech to listeners with sensorineural hearing loss when the speech is presented in a background noise. Previous studies have shown that when listeners have a severe hearing loss in the higher frequencies, providing audible speech (in a quiet background) to these higher frequencies usually results in no improvement in speech recognition. In the present experiments, speech was presented in a background of multitalker babble to listeners with various severities of hearing loss. The signal was low-pass filtered at numerous cutoff frequencies and speech recognition was measured as additional high-frequency speech information was provided to the hearing-impaired listeners. It was found in all cases, regardless of hearing loss or frequency range, that providing audible speech resulted in an increase in recognition score. The change in recognition as the cutoff frequency was increased, along with the amount of audible speech information in each condition (articulation index), was used to calculate the "efficiency" of providing audible speech. Efficiencies were positive for all degrees of hearing loss. However, the gains in recognition were small, and the maximum score obtained by an listener was low, due to the noise background. An analysis of error patterns showed that due to the limited speech audibility in a noise background, even severely impaired listeners used additional speech audibility in the high frequencies to improve their perception of the "easier" features of speech including voicing
Keyword speech intelligibility
hearing aids
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
 
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Created: Wed, 28 Mar 2007, 09:06:01 EST by Kathleen Reinhardt on behalf of Faculty Of Health Sciences