OBJECTIVE SPEECH INTELLIGIBILITY TESTING OF SOUND SYSTEMS
Peter A. Mapp · 2024
The paper examines and reviews the most commonly used, acoustically based, Indirect speech intelligibility measures such as Articulation Index, °/o Alcons, STI and Rasti as well as the lesser used early energy fractions such as C7 and 050.Their uses and more particularly their limitations are discussed.Measurement accuracy and common error mechanisms are highlighted, as are the effects of non-linear electronic and acoustic environments Erroneous effects that can be caused by modem signal processing and ways of avoiding such problems are also presented.The implications for producing workable and effective standards for sound system intelligibility measurement are discussed.1