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)^[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

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.

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[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

[1]

[2]

[3]

References

Further reading