Some spatial and temporal effects on the speech privacy of meeting rooms

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Journal titleJournal of the Acoustical Society of America
Pages30383051; # of pages: 14
Subjectspeech privacy, meeting rooms, spatial effect; Office acoustics; Speech security
AbstractThis paper reports on initial experiments concerning how key spatial and temporal effects in roomsinfluence the speech privacy provided by enclosed rooms. The first part of the work demonstratesthat for the same signal-to-noise ratio, the intelligibility of speech and the threshold of intelligibilityare significantly different for transmission between real rooms than in the previous results inapproximately free-field conditions. The second part investigates the influence of aspects of the spatial and temporal components of sound fields in typical rooms, to explain these differences for transmission betweenreal rooms. These components included the separate effects of early-arriving and later-arrivingreflected speech sounds. They also included the effects of spatially separated speech and noisesources as well as more diffuse noise representative of typical meeting rooms. In realisticcombinations these effects are of practical importance and can change privacy criteria by 5 dB ormore. Ignoring them could lead to costly over-design of the sound insulation required to achieveadequate speech privacy.
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number53559
NPARC number20374502
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Record identifier7357e19c-02f9-4f0d-8c7d-62f4dd51bcf4
Record created2012-07-23
Record modified2016-05-09
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