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Table 4 Relationship between the ITU-R 5-grade scale and ODG[30]

From: Practical design of delta-sigma multiple description audio coding

Impairment ITU-R 5-grade scale ODG
Imperceptible 5.0 0.0
Perceptible but not annoying 4.0 -1.0
Slightly annoying 3.0 -2.0
Annoying 2.0 -3.0
Very annoying 1.0 -4.0