Release Time:2019-03-11  Hits:

Indexed by: Conference Paper

Date of Publication: 2014-07-13

Included Journals: EI

Volume: 2

Page Number: 1832-1839

Abstract: Two STI (speech transmission index) measurement methods are recommended by IEC 60268-16: a direct method based on signal modulation and an indirect method based on impulse response. In this study, the STI and STIPA (speech transmission index for public address system) metrics were measured at 12 receiver positions in four rooms with a total of 48 measurement conditions using the direct and indirect methods, and the measurement results of the two methods were compared, with particular attention being paid to the influence of the frequency response of the measurement system. The results indicate that there is no substantial difference between the STI and STIPA metrics; both the direct and indirect measurement methods can be used as the objective rating method for speech intelligibility, as long as the standardised measurement program and measurement system are adopted.