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Table 2 Evaluation standards of STI values according to ICE 60268-16

From: Speech intelligibility improvement in noisy reverberant environments based on speech enhancement and inverse filtering

STI value Subjective intelligibility impression
0.75–1.00 Excellent
0.60–0.75 Good
0.45–0.60 Satisfactory
0.30–0.45 Poor
0.00–0.30 Very poor