Modeling the Influence of Early Sound Reflections on Speech Intelligibility

Prodeus, Arkadiy; Didkovska, Maryna; Kukharicheva, Kateryna; Motorniuk, Daria

doi:10.1109/msnmc50359.2020.9255657

Cited by 2 publications

(8 citation statements)

References 7 publications

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“…However, no relation between the scores of speech intelligibility and the volume of a lecture room was detected, the links between the STI and BRIR parameters were not analyzed either. This shortcoming is partly compensated in [37] when considering two models of early sound reflections. The results of the analysis of these models are consistent with the conclusions in research [38] on the dual role of early reflections that increase the signal level but distort its spectrum.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The results of the analysis of these models are consistent with the conclusions in research [38] on the dual role of early reflections that increase the signal level but distort its spectrum. However, the models considered in paper [37] need to be further refined, as they do not take into account an increase in the density of early reflections over time.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…As we can see, in all rooms there is an effect of the negative influence of early reflections from the side wall closest to a listener. The observed phenomenon can be explained by distortion of the form of a sound signal and, as a result, deterioration of the quality of a perceived signal, due to the discrete structure of the BRIR in the interval of 0-50 ms [37].…”

Section: Dependence Of Speech Intelligibility Scores On the Listener's Locationmentioning

confidence: 99%

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Assessment of speech intelligibility in university lecture rooms of different sizes using objective and subjective methods

Prodeus

Didkovska

2021

EEJET

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The scores of speech intelligibility, obtained using objective and subjective methods for three university lecture rooms of the small, medium, and large sizes with different degrees of filling, were presented. The problem of achieving high speech intelligibility is relevant for both students and university administration, and for architects designing or reconstructing lecture rooms. Speech intelligibility was assessed using binaural room impulse responses which applied an artificial head and non-professional quality audio equipment for measuring. The Speech Transmission Index was an objective measure of speech intelligibility, while the subjective evaluation of speech intelligibility was carried out using the articulation method. Comparative analysis of the effectiveness of parameters of impulse response as a measure of speech intelligibility showed that Early Decay Time exceeded the score of the T30 reverberation time but was ineffective in a small lecture room. The C50 clarity index for all the considered lecture rooms was the most informative. Several patterns determined by the influence of early sound reflections on speech intelligibility were detected. Specifically, it was shown that an increase in the ratio of the energy of early reflections to the energy of direct sound leads to a decrease in speech intelligibility. The exceptions are small, up to 30‒40 cm, distances from the back wall of the room, where speech intelligibility is usually slightly higher than in the middle of the room. At a distance of 0.7–1.7 m from the side walls of the room, speech intelligibility is usually worse for the ear, which is closer to the wall. The usefulness of the obtained results lies in refining the quantitative characteristics of the influence of early reflections of sound on speech intelligibility at different points of lecture rooms.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Dependence Of Speech Intelligibility Scores On the Listener's Locationmentioning

confidence: 99%

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Assessment of speech intelligibility in university lecture rooms of different sizes using objective and subjective methods

Prodeus

Didkovska

2021

EEJET

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“…As it turns out, BSD is slightly better than FWSNR at estimating speech intelligibility in rooms of any size. This fact can be explained by a more complete consideration of the human auditory system properties in the BSD calculations algorithm [13,26].…”

Section: B Robustness Of Obtained Resultsmentioning

confidence: 99%

“…340 c  m/s is speed of sound in the air. A simplified model of early reflections in the form of a pulsed flow was considered in [26] 1 ( ) ( ) ( )…”

Section: B Robustness Of Obtained Resultsmentioning

confidence: 99%

Impact of University Classroom Size on the Relationship between Speech Quality and Intelligibility

Prodeus¹,

Didkovska²,

Kukharicheva³

2022

IJC

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In this paper, five objective measures of the quality of speech signals distorted by reverberation are compared with the Speech Transmission Index (STI). The main aim of the comparison is to further test and explain the reasons for the previously discovered phenomenon of an increase in the speech quality and intelligibility with increasing room size. The comparison is performed for three university classrooms of small, medium and large sizes. The correlation coefficients between the quality and intelligibility estimates of speech obtained for 5-6 points of each room are estimated. Speech signal quality is assessed using intrusive measures such as segmental signal-to-noise ratio (SSNR), log-spectral distortion (LSD), frequency-weighted segmental signal-to-noise ratio (FWSNR), bark spectral distortion (BSD), and perceptual evaluation of speech quality (PESQ). For BSD, high correlation coefficients (0.57-0.99) are determined for rooms of all sizes and an increase in the correlation coefficient with the room size increase is found, which can be explained by a decrease in the density of early sound reflections. For FWSNR, high correlation (0.65-0.98) is determined for medium and large rooms. For PESQ, high correlation (0.96-0.99) is obtained for large classroom. SSNR and LSD are found to be uncorrelated with STI for rooms of all sizes.

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Modeling the Influence of Early Sound Reflections on Speech Intelligibility

Cited by 2 publications

References 7 publications

Assessment of speech intelligibility in university lecture rooms of different sizes using objective and subjective methods

Assessment of speech intelligibility in university lecture rooms of different sizes using objective and subjective methods

Impact of University Classroom Size on the Relationship between Speech Quality and Intelligibility

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