Objective difference grade

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The objective difference grade (ODG) is calculated by perceptual evaluation of the audio quality algorithm specified in ITU BS.1387-1.(PEAQ)[1] It corresponds to the subjective difference grade used in human-based audio tests.[2] The ODG ranges from 0 to −4 and is defined as follows:

Impairment description ITU-R Grade[3] 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


  1. ^ ITU Recommendation BS.1387
  2. ^ Introduction to Digital Audio Coding and Standards, by Marina Bosi and Richard E. Goldberg, Kluwer Academic Publishers (2002) ISBN 1-40207-357-7.
  3. ^ ITU Recommendation BS.1284

Further reading[edit]

  • Andreas Spanias; Ted Painter; Venkatraman Atti (2007). "Quality Measures for Perceptual Audio Coding". Audio Signal Processing and Coding. Wiley-Interscience. p. 401. ISBN 9780471791478. 
  • Nedeljko Cvejic; Tapio Tapio Seppänen (2007). "Subjective and Objective Quality Evaluation of Watremarked Audio". Digital Audio Watermarking Techniques and Technologies. Idea Group Inc. p. 270. ISBN 9781599045153.