BS.1387: Difference between revisions
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'''EAQUAL''' stands for ''Evaluation Of Audio Quality''. It's an '''objective''' measurement technique used to measure the quality of encoded/decoded audio files. It acts in contrast to more the common place '''subjective''' testing methodology deployed using [[ABX]] and [[ABC/HR]] reference testing ''(frequently preferred by hydrogenaudio)''. It's part of the ITU-R recommendation BS.1387. Several tests have been performed using EAQUAL most notably using numerous [http://www.hydrogenaudio.org/forums/index.php?showtopic=20264 AAC encoders] to determine via a [http://en.wikipedia.org/wiki/Pearson_correlation Pearson Correlation] the linear relationship between human ratings and EAQUAL ratings. | '''EAQUAL''' stands for ''Evaluation Of Audio Quality''. It's an '''objective''' measurement technique used to measure the quality of encoded/decoded audio files. It acts in contrast to more the common place '''subjective''' testing methodology deployed using [[ABX]] and [[ABC/HR]] reference testing ''(frequently preferred by hydrogenaudio)''. It's part of the ITU-R recommendation BS.1387. Several tests have been performed using EAQUAL most notably using numerous [http://www.hydrogenaudio.org/forums/index.php?showtopic=20264 AAC encoders] to determine via a [http://en.wikipedia.org/wiki/Pearson_correlation Pearson Correlation] the linear relationship between human ratings and EAQUAL ratings. The results however using objective testing methodologies are still inconclusive. | ||
==Additional reading:== | ===Additional reading:=== | ||
* [http://www.mp3-tech.org/programmer/sources/eaqual.tgz EAQUAL Sourcecode] linux archive of c code used to implement EAQUAL provided by Gabrial Bouvigne. | * [http://www.mp3-tech.org/programmer/sources/eaqual.tgz EAQUAL Sourcecode] linux archive of c code used to implement EAQUAL provided by Gabrial Bouvigne. | ||
* [http://www.rarewares.org/others.html EAQUAL Tools] zip compression archive of the utility used to perform EAQUAL tests provided by Rarewares. | * [http://www.rarewares.org/others.html EAQUAL Tools] zip compression archive of the utility used to perform EAQUAL tests provided by Rarewares. | ||
Revision as of 10:21, 8 July 2005
EAQUAL stands for Evaluation Of Audio Quality. It's an objective measurement technique used to measure the quality of encoded/decoded audio files. It acts in contrast to more the common place subjective testing methodology deployed using ABX and ABC/HR reference testing (frequently preferred by hydrogenaudio). It's part of the ITU-R recommendation BS.1387. Several tests have been performed using EAQUAL most notably using numerous AAC encoders to determine via a Pearson Correlation the linear relationship between human ratings and EAQUAL ratings. The results however using objective testing methodologies are still inconclusive.
Additional reading:
- EAQUAL Sourcecode linux archive of c code used to implement EAQUAL provided by Gabrial Bouvigne.
- EAQUAL Tools zip compression archive of the utility used to perform EAQUAL tests provided by Rarewares.