Speech related acoustical parameters in classrooms and their relationships

Tang, Shiu Keung

doi:10.1016/j.apacoust.2007.08.008

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…For the TSC velodrome, RT (500Hz-1000Hz) was 2.78-3.38 s, EDT (500Hz-1000Hz) was 2.22-3.63 s, and D50 (500Hz-4000Hz) was 0.3-0.62. The speech intelligibility in the stadium with a smaller volume decreased with the increase in RT or EDT, which was also found in ordinary spaces [5,27]. However, in the velodrome, for a relatively low SNR, this phenomenon was observed only when RT was less than 3 s; when RT was more than 3 s, the speech intelligibility increased with the increase in RT.…”

Section: Effect Of the Room-acoustic Parameterssupporting

confidence: 63%

“…On the other hand, the decay curves in large spaces as shown in Fig. 2 showed significant double-curvature, which was different from the exponential decay curves in ordinary spaces [27]. Moreover, the early decay rate at low-and-medium frequency sound which was the main components of speech had obvious fluctuation.…”

Section: Effect Of the Room-acoustic Parametersmentioning

confidence: 81%

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The speech intelligibility and applicability of the speech transmission index in large spaces

Liu

Kang

et al. 2020

Applied Acoustics

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This paper aims to explore the influence factors of speech intelligibility and the applicability of the speech transmission index (STI) in large spaces, where the sound energy is unevenly distributed and non-exponentially decays. The subjective speech intelligibility tests were conducted in Mandarin (China mainland) in two large spaces with volumes of 97000 m³ and 246000 m³. Objective indicators such as the Reverberation Time (RT), Early Decay Time (EDT), Definition (D50), and Speech Transmission Index (STI) under different signal-tonoise ratio (SNRs) were also measured in these two spaces. The results showed that both the SNR and room acoustics had significant effect on the speech intelligibility in these two spaces, but the effect of room acoustics on speech intelligibility was also affected by SNR. The speech intelligibility scores significantly increased with the increase in SNR when the SNR was less than 14.4dB. In terms of room acoustics, D50 was more relevant to speech intelligibility than RT and EDT in these two large spaces when SNR ranged from -5dB to 15dB. The STI value in large spaces should not be used as in ordinary spaces to evaluate the speech intelligibility. Based on the tests in this paper, the corresponding relation between STI and speech intelligibility in large spaces was modified, and a new rating threshold of STI was also proposed according to the revised relation, which indicated a necessity to modify the rating criteria of using STI to predict speech intelligibility in large spaces.

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Section: Effect Of the Room-acoustic Parameterssupporting

confidence: 63%

Section: Effect Of the Room-acoustic Parametersmentioning

confidence: 81%

The speech intelligibility and applicability of the speech transmission index in large spaces

Liu

Kang

et al. 2020

Applied Acoustics

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“…There are also studies investigating the relationships between various developed indices, for instance, Okano et al, 13 Carvalho, 14 and Tang. 15 The prediction of objective performance indices is also a hot topic. However, owing to the complexity of a performance hall, analytical formulas are hardly available.…”

Section: Introductionmentioning

confidence: 99%

Geometrical parameter combinations that correlate with early interaural cross-correlation coefficients in a performance hall

Cheung

Tang

2016

The Journal of the Acoustical Society of America

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The previous binaural data of the authors measured inside two multi-purpose performance halls are re-analyzed using regression in this study. It is done in an attempt to establish a framework that can improve the prediction of early interaural cross-correlation coefficients (IACCs), but with as little measurement effort and parameters as possible. The results show that regression models consist of linear combinations of polynomials of geometrical parameters, when used together with the measurement schemes suggested previously by the authors, are sufficient for predicting the IACCs to within engineering tolerance. The predictions are better than those obtained previously by the neural network approach of the authors. The relative importance of the geometrical parameters in the prediction of IACCs is also investigated.

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“…In the process of simulation, though the speech related acoustic parameters [27] such as EDT, RT, C80 and SPL have been carefully controlled, biases still exist between the simulated and in-situ measured speech intelligibility scores, and accordingly, further investigation is required to determine the cause.…”

Section: Discussionmentioning

confidence: 99%

Comparisons between simulated and in-situ measured speech intelligibility based on (binaural) room impulse responses

Zhu

Kang

et al. 2015

Applied Acoustics

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This study systematically compares acoustic simulation and in-situ measurement in terms of speech transmission index (STI), speech intelligibility scores and relationship curves when considering (binaural) room impulse response and four general room conditions, namely, an office, a laboratory, a multimedia lecture hall and a semi-anechoic chamber. The results reveal that STI can be predicted accurately by acoustic simulation (using room acoustics software ODEON) when there is a good agreement between the virtual models and the real rooms and that different reverberation time (RT) and signal-to-noise ratio (SNR) may exert less significant influence on the simulated STI. However, subjective intelligibility may be overestimated when using acoustic simulation due to the head-related transfer function (HRTF) filter used, and the score bias may be minimal and difficult to detect in everyday situations. There is no obvious score tendency caused by different RT, though with the decrease in the SNR, score bias may increase. Overall, considering that the accurate acoustic modelling of rooms is often problematic, it is difficult to obtain accurate speech intelligibility prediction results using a simulation technique, especially when the room has not yet been built.

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Speech related acoustical parameters in classrooms and their relationships

Cited by 8 publications

References 13 publications

The speech intelligibility and applicability of the speech transmission index in large spaces

The speech intelligibility and applicability of the speech transmission index in large spaces

Geometrical parameter combinations that correlate with early interaural cross-correlation coefficients in a performance hall

Comparisons between simulated and in-situ measured speech intelligibility based on (binaural) room impulse responses

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