Difference between revisions of "BS.1387"

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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 ''(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 using objective testing methodologies are still inconclusive.
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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 ''(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===
 
===Testing Using EAQUAL===
''note: I couldn't find any information about how the test is actually performed (no surprise). this section will be completed soon ''
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As of version 0.1.3alpha, the ''-h'' argument can be used to find out how to use eaqual (ex: ''eaqual -h'').<br>
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To compare a test wave file to a reference wave file, one can use for example: ''eaqual -fref ref.wav -ftest test.wav''.<br>
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===Interpreting the Results Output by EAQUAL===
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The results of EAQUAL are interpreted using what is known as an ODG score.
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''Note: this information needs to be expanded.''<br>
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===Status of the EAQUAL Project===
  
 
===External links:===  
 
===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.  
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* [http://www.mp3-tech.org/programmer/sources/eaqual.tgz EAQUAL Sourcecode] linux archive of c code used to implement EAQUAL provided by Gabriel 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.
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[[Category:Software]]

Revision as of 20:15, 11 September 2006

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 AAC encoders to determine via a 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).
To compare a test wave file to a reference wave file, one can use for example: eaqual -fref ref.wav -ftest test.wav.

Interpreting the Results Output by EAQUAL

The results of EAQUAL are interpreted using what is known as an ODG score. Note: this information needs to be expanded.

Status of the EAQUAL Project

External links:

  • EAQUAL Sourcecode linux archive of c code used to implement EAQUAL provided by Gabriel Bouvigne.
  • EAQUAL Tools zip compression archive of the utility used to perform EAQUAL tests provided by Rarewares.