THE SPEECH TRANSMISSION INDEX AFTER FOUR DECADES OF DEVELOPMENT.

This year, the Speech Transmission Index (STI) celebrates its 40th birthday. It has been four decades since Houtgast and Steeneken first published their objective method for predicting speech intelligibility in Acustica [1]. Since then, the STI has evolved into a versatile and mature method, used in a diversity of applications. It is now more popular than ever, with record numbers of STI users as well as manufacturers of STI measuring solutions. We mark the occasion by looking back at the development of the Speech Transmission Index throughout the decades, while also presenting an overview of current developments and challenges. [ABSTRACT FROM AUTHOR]

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