A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Experimental comparison between speech transmission index, rapid speech transmission index, and speech intelligibility index
Tekijät: Larm P, Hongisto V
Kustantaja: ACOUSTICAL SOC AMER AMER INST PHYSICS
Julkaisuvuosi: 2006
Journal: Journal of the Acoustical Society of America
Tietokannassa oleva lehden nimi: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Lehden akronyymi: J ACOUST SOC AM
Vuosikerta: 119
Numero: 2
Aloitussivu: 1106
Lopetussivu: 1117
Sivujen määrä: 12
ISSN: 0001-4966
DOI: https://doi.org/10.1021/1.2146112
Tiivistelmä
During the acoustical design of, e.g., auditoria or open-plan offices, it is important to know how speech can be perceived in various parts of the room. Different objective methods have been developed to measure and predict speech intelligibility, and these have been extensively used in various spaces. In this study, two such methods were compared, the speech transmission index (STI) and the speech intelligibility index (SII). Also the simplification of the STI, the room acoustics speech transmission index (RASTI), was considered. These quantities are all based on determining an apparent speech-to-noise ratio on selected frequency bands and summing them using a specific weighting. For comparison, some data were needed on the possible differences of these methods resulting from the calculation scheme and also measuring equipment. Their prediction accuracy was also of interest. Measurements were made in a laboratory having adjustable noise level and absorption, and in a real auditorium. It was found that the measurement equipment, especially the selection of the loudspeaker, can greatly affect the accuracy of the results. The prediction accuracy of the RASTI was found acceptable, if the input values for the prediction are accurately known, even though the studied space was not ideally diffuse. (c) 2006 Acoustical Society of America.
During the acoustical design of, e.g., auditoria or open-plan offices, it is important to know how speech can be perceived in various parts of the room. Different objective methods have been developed to measure and predict speech intelligibility, and these have been extensively used in various spaces. In this study, two such methods were compared, the speech transmission index (STI) and the speech intelligibility index (SII). Also the simplification of the STI, the room acoustics speech transmission index (RASTI), was considered. These quantities are all based on determining an apparent speech-to-noise ratio on selected frequency bands and summing them using a specific weighting. For comparison, some data were needed on the possible differences of these methods resulting from the calculation scheme and also measuring equipment. Their prediction accuracy was also of interest. Measurements were made in a laboratory having adjustable noise level and absorption, and in a real auditorium. It was found that the measurement equipment, especially the selection of the loudspeaker, can greatly affect the accuracy of the results. The prediction accuracy of the RASTI was found acceptable, if the input values for the prediction are accurately known, even though the studied space was not ideally diffuse. (c) 2006 Acoustical Society of America.
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