On the importance of early reflections for speech in rooms

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DOIResolve DOI: http://doi.org/10.1121/1.1570439
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Journal titleJournal of the Acoustical Society of America
IssueJune 6
Pages32333244; # of pages: 12
Subjectspeech intelligibility, room acoustics; Speech security
AbstractThis paper presents the results of new studies based on speech intelligibility tests in simulated sound fields and analyses of impulse response measurements in rooms used for speech communication. The speech intelligibility test results confirm the importance of early reflections for achieving good conditions for speech in rooms. The addition of early reflections increased the effective signal-to-noise ratio and related speech intelligibility scores for both impaired and non-impaired listeners. The new results also show that for common conditions where the direct sound is reduced, it is only possible to understand speech because of the presence of early reflections. Analyses of measured impulse responses in rooms intended for speech show that early reflections can increase the effective signal-to-noise ratio by up to 9 dB. A room acoustics computer model is used to demonstrate that the relative importance of early reflections can be influenced by the room acoustics design.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45431
NPARC number20386323
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Record identifierdd3c1e7a-8d8d-440e-bbcd-04c69ef20419
Record created2012-07-25
Record modified2016-05-09
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