Objective Difference Grade
Encyclopedia
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:
PEAQ
PEAQ is a standardized algorithm for objectively measuring perceived audio quality, developed in 1994-1998 by a joint venture of experts within Task Group 6Q of the International Telecommunication Union . It was originally released as ITU-R Recommendation BS.1387 in 1998 and last updated in 2001...
) 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 |