defines objective methods for rating the transmission quality of speech with respect to intelligibility. The four methods, which are closely related, are referred to as the "STI," the "STITEL", the "STIPA" and the "RASTI" methods (see Clause 3).
IEC 60268-16 Ed. 3.0 en:2003 History
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IEC 60268-16 Ed. 3.0 en:2003
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