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Further Investigations into Improving STI's Recognition of the Effects of Poor Frequency Response on Subjective Intelligibility

Previous work has highlighted deficiencies in the ability of the STI metric to satisfactorily recognise the subjective loss of intelligibility that occurs with sound systems having poor frequency responses, particularly in the presence of reverberation. In a recent paper, we explored the changes to STI values resulting from a range of dynamic speech spectra taken over differing time lengths with different filter responses. That work included determining the effects on STI values of three alternative spreading functions simulating the ear’s upward masking mechanism. This paper extends that work and explores the effects on STI values of two masking methods used in MPEG-1 audio coding.

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