Investigation on the effects of source directivity of Chinese speech intelligibility in real and virtual rooms

Peng, Jianxin; Wang, Ting; Wu, Shuoxian

doi:10.1016/j.apacoust.2013.03.004

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…This is different from the result of a previous study [6], where a smaller range of source directivity range was used. Also, due to the differences in room conditions, it is not necessary that a sound source with better directivity will have a higher intelligibility result when background noise is high, as suggested in another previous study [9]. …”

Section: Influence Of Directivitymentioning

confidence: 63%

“…Petra and Hongistob [8] compared the STI and SII measurement methods and suggested that loudspeakers possibly have a considerable influence on the STI and SII measurements. Peng et al [9] evaluated subjective Chinese speech intelligibility using three sources with different directional patterns: an omnidirectional source, a source with directivity similar to a human speaker, and a human speaker in both real and virtual rooms with different reverberation times. The results show that speech intelligibility scores obtained using an omnidirectional source are lower than those obtained using the other two sources.…”

Section: Introductionmentioning

confidence: 99%

“…For sound sources, directivity and frequency response are important characteristics that can influence the results of STI and SII measurements [6,7,8,9]. In IEC 60268-16 [5], it is specified clearly that STI measurement shall be conducted using a sound source with directivity and radiation pattern similar to those of the average human mouth and an omnidirectional microphone, and there are also corresponding specifications for the frequency response of sound sources.…”

Section: Introductionmentioning

confidence: 99%

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Influence of sound source characteristics in determining objective speech intelligibility metrics

Zhu

Kang

2015

Applied Acoustics

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Sound source characteristics may be one of the main causes of objective speech intelligibility metric inaccuracy. In this study, the influences of the sound source directivity and frequency response were investigated using three typical sound sources: an artificial mouth, a monitor speaker, and a dodecahedral sound source. The results show that, the simultaneous influences of directivity and frequency response on the objective speech intelligibility metric are significant, typically with a variation of 0.147 in speech transmission index (STI); sound source directivity may also result in a noticeable difference in the objective speech intelligibility metric, typically with a variation of 0.123 in STI. In comparison with sound sources with a high directivity index (DI), the measurement results for sound sources with a relatively low DI may be higher when background noise is high, and may be lower when background noise is low. The influence of sound source directivity may also depend on the room acoustic conditions, and at receiver position where reflections are abundant, the influence of sound source directivity may be more significant. Not applying frequency response equalisation resulted in large errors in the values being measured, which deviate from the real values of STI by up to 0.172, depending on the original frequency response characteristics of the sound sources that are used.

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Section: Influence Of Directivitymentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of sound source characteristics in determining objective speech intelligibility metrics

Zhu

Kang

2015

Applied Acoustics

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“…The directivity of the sound radiated by aspeaker has been studied for various purposes, including microphone placement optimisation [1], telephony [ 2], vocal performance practice [3,4,5], experimental validation of acoustic theories [6], architectural acoustics [7], auralization and 3D sound synthesis [8,9]. The observation on real subjects by several authors [1,4,3,5] showed that if as peaker issuance is almost omnidirectional at lowf requency, the directivity patterns become more and more complexa t high frequency.…”

Section: Introductionmentioning

confidence: 99%

Influence of Higher Order Acoustical Propagation Modes on Variable Section Waveguide Directivity: Application to Vowel [α]

Blandin¹,

Hirtum²,

Pelorson³

et al. 2016

Acta Acustica united with Acustica

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The radiation of sound from the mouth of aspeaker is often described using aplane piston assumption. This is satisfactory as long as the wavelength is longer than the largest transverse dimension of the vocal tract. Forshorter wavelengths, higher order acoustical modes can propagate and the particle velocity field in the mouth exit plane can be nonuniform. As aconsequence, the plane piston assumption does not hold and amore accurate description of the particle velocity distribution at the mouth exit is necessary.T his can be achievedu sing the multimodal theory which allows one to account for higher order mode propagation. In order to study the influence of higher order modes on the sound radiated from the mouth, four approximations of the vocal tract shape for the vowel [A] are studied. The eccentricity of the junctions between the different portions of these geometries is used to control the propagation of ahigher order mode. The radiated sound is simulated and compared with the measurements performed on mechanical replicas at various angles in the horizontal plane. It is observed that the propagation of ah igher order mode can strongly modify the directivity.V arying the degree of eccentricity of the junction between the different sections shows that avery small eccentricity can induce the propagation of ahigher order mode. Reducing the size of the open end shows that higher order modes can affect the radiated sound even if the radiating surface is small compared to the largest transverse dimension of the geometry.

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Experimental comparison of speech transmission index measurement in natural sound rooms and auditoria

Zhu

Tao

et al. 2020

Applied Acoustics

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Investigation on the effects of source directivity of Chinese speech intelligibility in real and virtual rooms

Cited by 8 publications

References 6 publications

Influence of sound source characteristics in determining objective speech intelligibility metrics

Influence of sound source characteristics in determining objective speech intelligibility metrics

Influence of Higher Order Acoustical Propagation Modes on Variable Section Waveguide Directivity: Application to Vowel [α]

Experimental comparison of speech transmission index measurement in natural sound rooms and auditoria

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