Objective Difference Grade

The objective difference grade (ODG) is calculated by perceptual evaluation of the audio quality algorithm specified in ITU BS.1387-1.(PEAQ) It corresponds to the subjective difference grade used in human-based audio tests. The ODG ranges from 0 to −4 and is defined as follows:

Impairment description ITU-R Grade 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

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