EAQUAL
From Hydrogenaudio Knowledgebase
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.
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[edit] 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.
[edit] 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.
[edit] Status of the EAQUAL Project
[edit] 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.
