Objective difference grade
In digital audio, 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 |
References
- ITU Recommendation BS.1387
- Introduction to Digital Audio Coding and Standards, by Marina Bosi and Richard E. Goldberg, Kluwer Academic Publishers (2002) ISBN 1-40207-357-7.
- ITU Recommendation BS.1284
Further reading
- Andreas Spanias; Ted Painter; Venkatraman Atti (2007). "Quality Measures for Perceptual Audio Coding". Audio Signal Processing and Coding. Wiley-Interscience. pp. 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.
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