In digital audio, the objective difference grade (ODG) is calculated by perceptual evaluation of the

audio quality Sound quality is typically an assessment of the accuracy, fidelity, or Intelligibility (communication), intelligibility of sound, audio output from an electronic device. Quality can be measured objectively, such as when tools are used to gaug ...

algorithm In mathematics and computer science, an algorithm () is a finite sequence of rigorous instructions, typically used to solve a class of specific Computational problem, problems or to perform a computation. Algorithms are used as specificat ...

specified in

ITU The International Telecommunication Union is a specialized agency of the United Nations responsible for many matters related to information and communication technologies. It was established on 17 May 1865 as the International Telegraph Unio ...

BS.1387-1.(

PEAQ Perceptual Evaluation of Audio Quality (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's Rad ...

) It corresponds to the

subjective difference grade Subjective may refer to: * Subjectivity, a subject's personal perspective, feelings, beliefs, desires or discovery, as opposed to those made from an independent, objective, point of view ** Subjective experience, the subjective quality of consc ...

used in human-based audio tests.''Introduction to Digital Audio Coding and Standards'', by Marina Bosi and Richard E. Goldberg, Kluwer Academic Publishers (2002) . The ODG ranges from 0 to −4 and is defined as follows:

References

Further reading