Steady-state pre-processing for improving speech intelligibility in reverberant environments: evaluation in a hall with an electrical reverberator

2005 ◽  
Author(s):  
Nahoko Hayashi ◽  
Takayuki Arai ◽  
Nao Hodoshima ◽  
Yusuke Miyauchi ◽  
Kiyohiro Kurisu
Keyword(s):  
Steady State ◽  
Speech Intelligibility ◽  
Reverberant Environments

scholarly journals Suppressing steady-state portions of speech for improving intelligibility in various reverberant environments

2004 ◽  
Vol 25 (1) ◽  
pp. 58-60 ◽  
Author(s):  
Nao Hodoshima ◽  
Tsuyoshi Inoue ◽  
Takayuki Arai ◽  
Akiko Kusumoto ◽  
Keisuke Kinoshita
Keyword(s):  
Steady State ◽  
Reverberant Environments

scholarly journals Effects of suppressing steady-state portions of speech on intelligibility in reverberant environments

2002 ◽  
Vol 23 (4) ◽  
pp. 229-232 ◽  
Author(s):  
Takayuki Arai ◽  
Keisuke Kinoshita ◽  
Nao Hodoshima ◽  
Akiko Kusumoto ◽  
Tomoko Kitamura
Keyword(s):  
Steady State ◽  
Reverberant Environments

scholarly journals Interactions Between Digital Noise Reduction and Reverberation: Acoustic and Behavioral Effects

2020 ◽  
Vol 31 (01) ◽  
pp. 017-029
Author(s):  
Paul Reinhart ◽  
Pavel Zahorik ◽  
Pamela Souza
Keyword(s):  
Noise Reduction ◽  
Hearing Impairment ◽  
Hearing Aids ◽  
Background Noise ◽  
Speech Intelligibility ◽  
Spectral Subtraction ◽  
Listening Effort ◽  
Speech In Noise ◽  
Reverberant Environments ◽  
Speech Naturalness

AbstractDigital noise reduction (DNR) processing is used in hearing aids to enhance perception in noise by classifying and suppressing the noise acoustics. However, the efficacy of DNR processing is not known under reverberant conditions where the speech-in-noise acoustics are further degraded by reverberation.The purpose of this study was to investigate acoustic and perceptual effects of DNR processing across a range of reverberant conditions for individuals with hearing impairment.This study used an experimental design to investigate the effects of varying reverberation on speech-in-noise processed with DNR.Twenty-six listeners with mild-to-moderate sensorineural hearing impairment participated in the study.Speech stimuli were combined with unmodulated broadband noise at several signal-to-noise ratios (SNRs). A range of reverberant conditions with realistic parameters were simulated, as well as an anechoic control condition without reverberation. Reverberant speech-in-noise signals were processed using a spectral subtraction DNR simulation. Signals were acoustically analyzed using a phase inversion technique to quantify improvement in SNR as a result of DNR processing. Sentence intelligibility and subjective ratings of listening effort, speech naturalness, and background noise comfort were examined with and without DNR processing across the conditions.Improvement in SNR was greatest in the anechoic control condition and decreased as the ratio of direct to reverberant energy decreased. There was no significant effect of DNR processing on speech intelligibility in the anechoic control condition, but there was a significant decrease in speech intelligibility with DNR processing in all of the reverberant conditions. Subjectively, listeners reported greater listening effort and lower speech naturalness with DNR processing in some of the reverberant conditions. Listeners reported higher background noise comfort with DNR processing only in the anechoic control condition.Results suggest that reverberation affects DNR processing using a spectral subtraction algorithm in such a way that decreases the ability of DNR to reduce noise without distorting the speech acoustics. Overall, DNR processing may be most beneficial in environments with little reverberation and that the use of DNR processing in highly reverberant environments may actually produce adverse perceptual effects. Further research is warranted using commercial hearing aids in realistic reverberant environments.

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