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STI to SRT conversion issue

Dear List,


I would like to convert the speech intelligibility data from van Wijngaarden and Drullman (JASA, vol 123, pages 4514-4523) which are presented as a CVC word score (in percent correct) versus STI (Speech Transmission Index). I want to get the corresponding SRT (Speech Reception Threshold  = SNR for 50% correct)  of each condition.


Does anyone know how to do it or have any paper/documentation to recommend which might be helpful?


Thanks a lot,


Best regards,




Ph.D. Student

Université de Lyon - École Nationale des Travaux Publics de l'État (ENTPE)

Laboratoire Génie Civil et Bâtiment (LGCB)

Rue Maurice Audin - 69518 Vaulx-en-Velin - France

Office B022

Tel : (+33)