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Comparison of Predicted, Measured and Auralized Sound Fields with Respect to Speech Intelligibility in Classrooms Using CATT-Acoustic and ODEON

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CATT-Acoustic and ODEON, two software systems for modeling rooms, predicting their acoustical characteristics and auralizing sound in them, were compared — and compared with experiment in the real rooms — with respect to speech intelligibility, at three receiver positions, in classrooms with low and high reverberation times and low and high background noise. Speech intelligibility was measured using Modified Rhyme Test speech signals combined, in the high-noise case, with four-talker babble noise, either played into the real classrooms or auralized in the virtual rooms by way of head-related transfer functions and predicted binaural impulse responses. Predictions of reverberation time, early-decay time, 80-ms early-to-late energy fraction and steady-state level, in octave bands from 125 to 4000 Hz, were very similar; however, significant differences between the results in the real and virtual classrooms were found. Good agreement was found between speech-intelligibility results for the virtual classrooms created by the two models, especially in the low-noise condition. In the high-reverberation room, the results from the virtual classrooms agreed with those for the real classroom; however, in the low-reverberation room, results from the virtual classrooms were significantly lower than those in the virtual classrooms, especially with babble noise. This result is anomalous, suggesting that auralization is not accurate in the case of high noise and/or low reverberation.
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Document Type: Research Article

Publication date: November 1, 2008

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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