Comparing the effects of reverberation and of noise on speech recognition in simulated electric-acoustic listening

Tillery, Kate Helms; Brown, Christopher A.; Bacon, Sid P.

doi:10.1121/1.3664101

Cited by 22 publications

(19 citation statements)

References 71 publications

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“…The lack of spectral smearing for acoustic stimuli with bimodal simulations is consistent with other studies examining bimodal hearing for normal-hearing individuals (Brown and Bacon 2009a, 2009b; Chang et al 2006; Helms Tillery et al 2012; Kong and Carlyon 2007; Qin et al 2006). For example, Kong and Carolyn (2007) tested sentence recognition at a +5 dB SNR and found an average of approximately 25-percentage points bimodal benefit.…”

Section: Discussionsupporting

confidence: 89%

The Effects of Acoustic Bandwidth on Simulated Bimodal Benefit in Children and Adults with Normal Hearing

et al. 2016

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Objectives The primary purpose of this study was to examine the effect of acoustic bandwidth on bimodal benefit for speech recognition in normal-hearing children with a cochlear implant (CI) simulation in one ear and low-pass filtered stimuli in the contralateral ear. The effect of acoustic bandwidth on bimodal benefit in children was compared to the pattern of adults with normal hearing. Our hypothesis was that children would require a wider acoustic bandwidth than adults to 1) derive bimodal benefit, and 2) obtain asymptotic bimodal benefit. Design Nineteen children (6–12 years) and ten adults with normal hearing participated in the study. Speech recognition was assessed via recorded sentences presented in a 20-talker babble. The AzBio female-talker sentences were used for the adults and the pediatric AzBio sentences (BabyBio) were used for the children. A CI simulation was presented to the right ear and low-pass filtered stimuli were presented to the left ear with the following cutoff frequencies: 250 Hz, 500 Hz, 750 Hz, 1000, and 1500 Hz. Results The primary findings were 1) adults achieved higher performance than children when presented with only low-pass filtered acoustic stimuli, 2) adults and children performed similarly in all the simulated CI and bimodal conditions, 3) children gained significant bimodal benefit with the addition of low-pass filtered speech at 250 Hz, and 4) unlike previous studies completed with adult bimodal patients, adults and children with normal hearing gained additional significant bimodal benefit with cutoff frequencies up to 1500 Hz with most of the additional benefit gained with energy below 750 Hz. Conclusions Acoustic bandwidth effects on simulated bimodal benefit were similar in children and adults with normal hearing. Should the current results generalize to children with CIs, these results suggest pediatric CI recipients may derive significant benefit from minimal acoustic hearing (<250 Hz) in the non-implanted ear and increasing benefit with broader bandwidth. Knowledge of the effect of acoustic bandwidth on bimodal benefit in children may help direct clinical decisions regarding a second CI, continued bimodal hearing, and even optimizing acoustic amplification for the non-implanted ear.

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Section: Discussionsupporting

confidence: 89%

The Effects of Acoustic Bandwidth on Simulated Bimodal Benefit in Children and Adults with Normal Hearing

et al. 2016

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“…Syllable identification depends more on the initial than on the finial. Moreover, in the time domain, the reverberation smears the time gap between syllables, which also reduces the speech intelligibility (Tillery et al, 2012). When reverberation and noise are combined, especially with long RT, reverberation does not only strongly mask the initial, final, and tone, but it also enhances the noise level that increases the masking effect of noise on the initial, final, and tone.…”

Section: Resultsmentioning

confidence: 99%

Chinese Syllable and Phoneme Identification in Noise and Reverberation

Peng¹

2015

Archives of Acoustics

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Chinese is a tonal language, which differentiates it from non-tonal languages in the Western countries. A Chinese character consists of an initial, a final, and a tone. In the present study, the effects of noise and reverberation on the Chinese syllable, initial, final, and tone identification in rooms were investigated by using simulated binaural impulse responses through auralization method. The results show that the syllable identification score is the lowest, the tone identification score is the highest, and the initial identification scores are lower than those of the final identification under the same reverberation time and signal-to-noise ratio condition. The Chinese syllable, initial, and final identification scores increase with the increase of signal-to-noise ratio and decrease of the reverberation time. The noise and reverberation have insignificant effects on the Chinese tone identification scores under most room acoustical environments. The statistical relationship between the Chinese syllable articulation and phoneme articulation had been experimentally proved under different noise and reverberation conditions in simulated rooms.

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“…It is now widely accepted that electric-acoustic stimulation (EAS) in the form of bimodal hearing [cochlear implant (CI) supplemented by low-frequency acoustic hearing in the contralateral ear] or hybrid hearing (CI supplemented by low-frequency acoustic hearing preserved postoperatively in the same ear) has the potential to enhance speech understanding relative to a CI alone (see reviews by Gifford, 2008, 2010). This is especially true when the target speech signal occurs in the presence of competing maskers or background noise (e.g., real EAS users: Kong et al, 2005;Zhang et al, 2010;Carroll et al, 2011;Visram et al, 2012a,b;Neuman and Svirsky, 2013; simulated EAS listeners: Qin and Oxenham, 2006;Li and Loizou, 2008;Tillery et al, 2012).…”

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confidence: 99%

The role of continuous low-frequency harmonicity cues for interrupted speech perception in bimodal hearing

Donaldson

Kong

2016

The Journal of the Acoustical Society of America

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Low-frequency acoustic cues have been shown to enhance speech perception by cochlear-implant users, particularly when target speech occurs in a competing background. The present study examined the extent to which a continuous representation of low-frequency harmonicity cues contributes to bimodal benefit in simulated bimodal listeners. Experiment 1 examined the benefit of restoring a continuous temporal envelope to the low-frequency ear while the vocoder ear received a temporally interrupted stimulus. Experiment 2 examined the effect of providing continuous harmonicity cues in the low-frequency ear as compared to restoring a continuous temporal envelope in the vocoder ear. Findings indicate that bimodal benefit for temporally interrupted speech increases when continuity is restored to either or both ears. The primary benefit appears to stem from the continuous temporal envelope in the low-frequency region providing additional phonetic cues related to manner and F1 frequency; a secondary contribution is provided by low-frequency harmonicity cues when a continuous representation of the temporal envelope is present in the low-frequency, or both ears. The continuous temporal envelope and harmonicity cues of low-frequency speech are thought to support bimodal benefit by facilitating identification of word and syllable boundaries, and by restoring partial phonetic cues that occur during gaps in the temporally interrupted stimulus.

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Comparing the effects of reverberation and of noise on speech recognition in simulated electric-acoustic listening

Cited by 22 publications

References 71 publications

The Effects of Acoustic Bandwidth on Simulated Bimodal Benefit in Children and Adults with Normal Hearing

The Effects of Acoustic Bandwidth on Simulated Bimodal Benefit in Children and Adults with Normal Hearing

Chinese Syllable and Phoneme Identification in Noise and Reverberation

The role of continuous low-frequency harmonicity cues for interrupted speech perception in bimodal hearing

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