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dc.contributor.authorHammond, Ross
dc.contributor.authorMapp, Peter
dc.contributor.authorHill, Adam J.
dc.date.accessioned2017-08-08T13:50:25Z
dc.date.available2017-08-08T13:50:25Z
dc.date.issued2017-05-21
dc.identifier.citationHammond, R., Mapp, P., Hill, A. J. (2017) 'Disagreement between STI and STIPA measurements due to high level, discrete reflections'. Presented at 142nd Convention of the Audio Engineering Society, Berlin, Germany. 20-23rd May.en
dc.identifier.urihttp://hdl.handle.net/10545/621811
dc.description.abstractObjective measures of intelligibility, speech transmission index (STI) and speech transmission index for public address systems (STIPA), often form the basis for sound system verification. The reported work challenges the accuracy of both measures when encountering high level, discrete reflections. Tests were carried out in an anechoic environment with artificial reflections added between 0 and 500ms. Discrepancies were found to occur above 80ms due to synchronisation between modulation frequencies and reflection arrival times. Differences between STI and STIPA of up to 0.1 were found to occur for the same delay condition. Results suggest STIPA should be avoided in acoustic environments where high level, discrete reflections occur after 80ms and STI should only be used alongside other verification methods.
dc.description.sponsorshipN/Aen
dc.language.isoenen
dc.publisherAudio Engineering Societyen
dc.relation.urlhttp://www.aes.org/e-lib/browse.cfm?elib=18686en
dc.relation.urlhttp://aesberlin17.mapyourshow.com/7_0/sessions/session-details.cfm?scheduleid=266en
dc.subjectAudio engineeringen
dc.subjectAcousticsen
dc.subjectPsychoacousticsen
dc.subjectSTIen
dc.subjectSpatial audioen
dc.titleDisagreement between STI and STIPA measurements due to high level, discrete reflectionsen
dc.typeMeetings and Proceedingsen
dc.contributor.departmentUniversity of Derbyen
dc.contributor.departmentPeter Mapp Accosiatesen
html.description.abstractObjective measures of intelligibility, speech transmission index (STI) and speech transmission index for public address systems (STIPA), often form the basis for sound system verification. The reported work challenges the accuracy of both measures when encountering high level, discrete reflections. Tests were carried out in an anechoic environment with artificial reflections added between 0 and 500ms. Discrepancies were found to occur above 80ms due to synchronisation between modulation frequencies and reflection arrival times. Differences between STI and STIPA of up to 0.1 were found to occur for the same delay condition. Results suggest STIPA should be avoided in acoustic environments where high level, discrete reflections occur after 80ms and STI should only be used alongside other verification methods.


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