Abstract:
In order to clarify the applicability of STI as a parameter in sound system design, a working group was organized in JATET (Theatre and Entertainment Technology Association, Japan) in 1993. It has conducted a series of investigations on speech intelligibility in various aspects. This report summarizes the results of investigations on the following items: (1) STI round-robin tests with six measuring systems; (2) relationships between the intelligibility in listening tests and measured STI under the following different conditions---(a) acoustical conditions of the room, (b) types of loudspeakers, (c) listening levels, (d) frequency characteristics of signal sources, with and without microphone---(3) prediction of STI by computer simulation; and (4) a listening test by an auralization system.