BS.1387

2005-12-09T00:01:09Z

Dorutc:

'''EAQUAL''' stands for ''Evaluation Of Audio Quality''. It's an '''objective''' measurement technique used to measure the quality of encoded/decoded audio files ''(very similiar to PEAQ)''. 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 on a given set of test samples. The results, however when using objective testing methodologies are still inconclusive and mostly only used by codec developers and researchers.

===Testing Using EAQUAL===
As of version 0.1.3alpha, the ''-h'' argument can be used to find out how to use eaqual (ex: ''eaqual -h'').<br>
To compare a test wave file to a reference wave file, one can use for example: ''eaqual -fref ref.wav -ftest test.wav''.<br>

===Interpreting the Results Output by EAQUAL===
''Note: I couldn't find information on how to interpret the output of eaqual.''<br>

===Status of the EAQUAL Project===
''Note: I couldn't find information on whether or not this useful project is still maintained, nor where is its home page.''<br>

===External links:===

* [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.

Hydrogenaudio Knowledgebase - User contributions [en]

BS.1387