Study on Chinese Speech Intelligibility Under Different Low-Frequency Characteristics of Reverberation Time Using a Hybrid Method

Reverberation time (RT) is an important indicator of room acoustics, however, most studies focus on the mid-high frequency RT, and less on the low-frequency RT. In this paper, a hybrid approach based on geometric and wave methods was proposed to build a more accurate and wide frequency-band room aco...

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Bibliographic Details
Published inArchives of acoustics Vol. 48; no. 2; pp. 151 - 157
Main Authors Huang, Wuqiong, Peng, Jianxin, Xie, Tinghui
Format Journal Article
LanguageEnglish
Published Warsaw Polish Academy of Sciences 01.01.2023
Institute of Fundamental Technological Research
Subjects
Acoustics
Architecture
Archives & records
Boundary conditions
classroom
Classrooms
Consonants (speech)
finite-difference time-domain method
High frequencies
Impulse response
Intelligibility
low frequency
Reverberation time
Simulation
Speech
speech intelligibility
Syllables
Time domain analysis
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Summary:Reverberation time (RT) is an important indicator of room acoustics, however, most studies focus on the mid-high frequency RT, and less on the low-frequency RT. In this paper, a hybrid approach based on geometric and wave methods was proposed to build a more accurate and wide frequency-band room acoustic impulse response. This hybrid method utilized the finite-difference time-domain (FDTD) method modeling at low frequencies and the Odeon simulation at mid-high frequencies, which was investigated in a university classroom. The influence of the low-frequency RT on speech intelligibility was explored. For the low-frequency part, different impedance boundary conditions were employed and the effectiveness of the hybrid method has also been verified. From the results of objective acoustical parameters and subjective listening experiments, the smaller the low-frequency RT was, the higher the Chinese speech intelligibility score was. The syllables, consonants, vowels, and the syllable order also had significant effects on the intelligibility score.
ISSN:0137-5075
2300-262X
DOI:10.24425/aoa.2023.145229