The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Trevor J. Cox - One of the best experts on this subject based on the ideXlab platform.
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A neural network model for Speech Intelligibility quantification
Applied Soft Computing, 2007Co-Authors: Trevor J. CoxAbstract:A neural network based model is developed to quantify Speech Intelligibility by blind-estimating Speech transmission index, an objective rating index for Speech Intelligibility of transmission channels, from transmitted Speech signals without resort to knowledge of original Speech signals. It consists of a Hilbert transform processor for Speech envelope detection, a Welch average periodogram algorithm for envelope spectrum estimation, a principal components analysis (PCA) network for Speech feature extraction and a multi-layer back-propagation network for non-linear mapping and case generalisation. The developed model circumvents the use of artificial test signals by exploiting naturally occurring Speech signals as probe stimuli, reduces measurement channels from two to one and hence facilitates in situ assessment of Speech Intelligibility. From a cognitive science viewpoint, the proposed method might be viewed as a successful paradigm of mimicking human perception of Speech Intelligibility using a hybrid model built around artificial neural networks.
Morteza Hamidi Nahrani - One of the best experts on this subject based on the ideXlab platform.
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The effect of hearing protection devices on Speech Intelligibility of Persian employees
BMC research notes, 2020Co-Authors: Mina Karami, Mohsen Aliabadi, Rostam Golmohammadi, Morteza Hamidi NahraniAbstract:This study aimed to investigate the effect of hearing protection devices (HPDs) on Speech Intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech Intelligibility during using HPDs was determined based on the Speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and + 5). Data were analyzed using SPSS 22. The actual to nominal noise reduction rating values were from 47 to 84% for HPDs. At two S/N ratios, no significant differences were observed in Speech Intelligibility using HPDs (p > 0.05). At S/N ratio = 0, the Speech Intelligibility descriptively has been only improved by using common earmuffs up to 9.07%. There was a significant difference up to 21.27% in Speech Intelligibility for proposed molded earplugs at S/N ratio = 0 (p
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The effect of hearing protection devices on Speech Intelligibility of Persian employees
2020Co-Authors: Mina Karami, Mohsen Aliabadi, Rostam Golmohammadi, Morteza Hamidi NahraniAbstract:Abstract Objective: This study aimed to investigate the effect of hearing protection devices (HPDs) on Speech Intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech Intelligibility during using HPDs was determined based on the Speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and +5). Data were analyzed using SPSS 22.Results: The actual to nominal noise reduction rating values were from 47% to 84% for HPDs. At two S/N ratios, no significant differences were observed in Speech Intelligibility using HPDs (p >0.05). At S/N ratio=0, the Speech Intelligibility descriptively has been only improved by using common earmuffs up to 9.07 %. There was a significant difference up to 21.27% in Speech Intelligibility for proposed molded earplugs at S/N ratio=0 (p <0.05). Increasing the HPDs' noise attenuation values led to an increase in Speech interference (p <0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable Speech Intelligibility should be worn by employees exposed to medium noise levels.
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The effect of hearing protection devices on Speech Intelligibility of Persian employees
2020Co-Authors: Mina Karami, Mohsen Aliabadi, Rostam Golmohammadi, Morteza Hamidi NahraniAbstract:Abstract Objective: This study aimed to investigate the effect of hearing protection devices (HPDs) on Speech Intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech Intelligibility during using HPDs was determined based on the Speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and +5). Data were analyzed using SPSS 22.Results: The actual to nominal noise reduction rating values were from 47% to 84% for HPDs. At two S/N ratios, no significant differences were observed in Speech Intelligibility using HPDs (p >0.05). At S/N ratio=0, the Speech Intelligibility descriptively has been only improved by using common earmuffs up to 9.07 %. There was a significant difference up to 21.27% in Speech Intelligibility for proposed molded earplugs at S/N ratio=0 (p <0.05). Increase the HPDs' noise attenuation values lead to increase interference in the Speech (p <0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable Speech Intelligibility should be worn by employees exposed to medium noise levels.
Mina Karami - One of the best experts on this subject based on the ideXlab platform.
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The effect of hearing protection devices on Speech Intelligibility of Persian employees
BMC research notes, 2020Co-Authors: Mina Karami, Mohsen Aliabadi, Rostam Golmohammadi, Morteza Hamidi NahraniAbstract:This study aimed to investigate the effect of hearing protection devices (HPDs) on Speech Intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech Intelligibility during using HPDs was determined based on the Speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and + 5). Data were analyzed using SPSS 22. The actual to nominal noise reduction rating values were from 47 to 84% for HPDs. At two S/N ratios, no significant differences were observed in Speech Intelligibility using HPDs (p > 0.05). At S/N ratio = 0, the Speech Intelligibility descriptively has been only improved by using common earmuffs up to 9.07%. There was a significant difference up to 21.27% in Speech Intelligibility for proposed molded earplugs at S/N ratio = 0 (p
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The effect of hearing protection devices on Speech Intelligibility of Persian employees
2020Co-Authors: Mina Karami, Mohsen Aliabadi, Rostam Golmohammadi, Morteza Hamidi NahraniAbstract:Abstract Objective: This study aimed to investigate the effect of hearing protection devices (HPDs) on Speech Intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech Intelligibility during using HPDs was determined based on the Speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and +5). Data were analyzed using SPSS 22.Results: The actual to nominal noise reduction rating values were from 47% to 84% for HPDs. At two S/N ratios, no significant differences were observed in Speech Intelligibility using HPDs (p >0.05). At S/N ratio=0, the Speech Intelligibility descriptively has been only improved by using common earmuffs up to 9.07 %. There was a significant difference up to 21.27% in Speech Intelligibility for proposed molded earplugs at S/N ratio=0 (p <0.05). Increasing the HPDs' noise attenuation values led to an increase in Speech interference (p <0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable Speech Intelligibility should be worn by employees exposed to medium noise levels.
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The effect of hearing protection devices on Speech Intelligibility of Persian employees
2020Co-Authors: Mina Karami, Mohsen Aliabadi, Rostam Golmohammadi, Morteza Hamidi NahraniAbstract:Abstract Objective: This study aimed to investigate the effect of hearing protection devices (HPDs) on Speech Intelligibility in Persian work environments. Three current earmuffs and three earplugs and one of the prototypes of molded earplug were tested on 15 male subjects which were randomly selected. The noise reduction of HPDs was measured based on the Real Ear Attenuation at Threshold (REAT) method. Speech Intelligibility during using HPDs was determined based on the Speech discrimination score (SDS) at two signal to noise (S/N) ratios (0 and +5). Data were analyzed using SPSS 22.Results: The actual to nominal noise reduction rating values were from 47% to 84% for HPDs. At two S/N ratios, no significant differences were observed in Speech Intelligibility using HPDs (p >0.05). At S/N ratio=0, the Speech Intelligibility descriptively has been only improved by using common earmuffs up to 9.07 %. There was a significant difference up to 21.27% in Speech Intelligibility for proposed molded earplugs at S/N ratio=0 (p <0.05). Increase the HPDs' noise attenuation values lead to increase interference in the Speech (p <0.05). The HPDs with the minimum required noise attenuation while maintaining acceptable Speech Intelligibility should be worn by employees exposed to medium noise levels.
Etienne Gaudrain - One of the best experts on this subject based on the ideXlab platform.
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neural entrainment to Speech modulates Speech Intelligibility
Current Biology, 2017Co-Authors: Lars Riecke, Elia Formisano, Bettina Sorger, Deniz Baskent, Etienne GaudrainAbstract:Summary Speech is crucial for communication in everyday life. Speech-brain entrainment, the alignment of neural activity to the slow temporal fluctuations (envelope) of acoustic Speech input, is a ubiquitous element of current theories of Speech processing. Associations between Speech-brain entrainment and acoustic Speech signal, listening task, and Speech Intelligibility have been observed repeatedly. However, a methodological bottleneck has prevented so far clarifying whether Speech-brain entrainment contributes functionally to (i.e., causes) Speech Intelligibility or is merely an epiphenomenon of it. To address this long-standing issue, we experimentally manipulated Speech-brain entrainment without concomitant acoustic and task-related variations, using a brain stimulation approach that enables modulating listeners' neural activity with transcranial currents carrying Speech-envelope information. Results from two experiments involving a cocktail-party-like scenario and a listening situation devoid of aural Speech-amplitude envelope input reveal consistent effects on listeners' Speech-recognition performance, demonstrating a causal role of Speech-brain entrainment in Speech Intelligibility. Our findings imply that Speech-brain entrainment is critical for auditory Speech comprehension and suggest that transcranial stimulation with Speech-envelope-shaped currents can be utilized to modulate Speech comprehension in impaired listening conditions.
Bradford N. Gover - One of the best experts on this subject based on the ideXlab platform.
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Evaluating airborne sound insulation in terms of Speech Intelligibility
Journal of the Acoustical Society of America, 2008Co-Authors: Hyeon Ku Park, John S. Bradley, Bradford N. GoverAbstract:This paper reports on an evaluation of ratings of the sound insulation of simulated walls in terms of the Intelligibility of Speech transmitted through the walls. Subjects listened to Speech modified to simulate transmission through 20 different walls with a wide range of sound insulation ratings, with constant ambient noise. The subjects’ mean Speech Intelligibility scores were compared with various physical measures to test the success of the measures as sound insulation ratings. The standard Sound Transmission Class (STC) and Weighted Sound Reduction Index ratings were only moderately successful predictors of Intelligibility scores, and eliminating the 8dB rule from STC led to very modest improvements. Various previously established Speech Intelligibility measures (e.g., Articulation Index or Speech Intelligibility Index) and measures derived from them, such as the Articulation Class, were all relatively strongly related to Speech Intelligibility scores. In general, measures that involved arithmetic av...
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Using Speech Intelligibility Scores to Rate Sound Insulation
Canadian Acoustics, 2007Co-Authors: Hyeon Ku Park, John S. Bradley, Bradford N. GoverAbstract:Sound insulation ratings have been measured by using Speech Intelligibility of transmitted Speech as Speech is a common type of disturbing sound and because Speech Intelligibility tests can provide accurate subjective ratings. Airborne sound insulation is usually rated in terms of the ISO Weighted Sound Reduction Index (R w ) or the ASTM Sound Transmission Class (STC). Measures in which decibel values are arithmetically averaged over a range of frequencies were all generally quite successful. However, results tended to be less successful, when measures included energy averaging of values at various frequencies. The arithmetic average transmission loss measure AA(200-2.5k) and the R w measure with the new spectrum weighting term provided very good relationships with mean Speech Intelligibility scores and are considerable improvements over existing standard measures. The new spectrum weighting is also appealing because it adds to an existing standardized approach.
