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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 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[edit]

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[edit]

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[edit]

External links:[edit]

  • 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.