ABX test

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An ABX test is a method of comparing two digital audio files to determine if any audible differences between the files can be found.

Its main use is to determine whether a lossy format can be used to compress a given audio file without introducing audible compression artifacts, or a lossless one should be used instead. It can also be useful to compare the different degrees of fidelity loss between different formats at a given bitrate, and decide which format to use.

In order to determine the loss of quality through the compression process, the compressed (lossy) output (e.g. Ogg Vorbis, mp3, AAC, etc.) file is compared with a lossless source (e.g. FLAC, Apple Lossless, WMA Lossless, APE, uncompressed WAV, etc.)

An ABX test can be performed with the foobar2000 audio player.

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