Speech transmission index

Speech Transmission Index (STI) is a measure of speech transmission quality. The absolute measurement of speech intelligibility is a complex science. The STI measures some physical characteristics of a transmission channel (a room, electro-acoustic equipment, telephone line, etc.), and expresses the ability of the channel to carry across the characteristics of a speech signal. STI is a well-established objective measurement predictor of how the characteristics of the transmission channel affect speech intelligibility.Jacob, K., McManus, S., Verhave, J.A., and Steeneken, H., (2002) 'Development of an Accurate, Handheld, Simple-to-use Meter for the Prediction of Speech Intelligibility', Past, Present, and Future of the Speech Transmission Index, International Symposium on STI Speech Transmission Index (STI) is a measure of speech transmission quality. The absolute measurement of speech intelligibility is a complex science. The STI measures some physical characteristics of a transmission channel (a room, electro-acoustic equipment, telephone line, etc.), and expresses the ability of the channel to carry across the characteristics of a speech signal. STI is a well-established objective measurement predictor of how the characteristics of the transmission channel affect speech intelligibility. The influence that a transmission channel has on speech intelligibility is dependent on: The STI was introduced by Tammo Houtgast and Herman Steeneken in 1971, and was accepted by Acoustical Society of America in 1980. Steeneken and Houtgast decided to develop the Speech Transmission Index because they were tasked to carry out a very lengthy series of dull speech intelligibility measurements for the Netherlands Armed Forces. Instead, they spent the time developing a much quicker objective method (which was actually the predecessor to the STI).