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A codec listening test is a scientific study designed to compare two or more lossy audio codecs, usually with respect to perceived fidelity or compression efficiency. Most tests take the form of a double-blind comparison. Commonly used methods are known as "ABX" or "ABC/HR" or "MUSHRA". There are various software packages available for ...
They are widely used in research on telecommunications, speech, and acoustics, where standardized and repeatable sequences of speech are needed. The Open Speech Repository [4] provides some freely usable, prerecorded WAV files of Harvard Sentences in American and British English, in male and female voices.
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A test CD is a compact disc containing tracks of musical and technical tests and demonstrations. Most of the tracks are made of electronic signals and pure frequencies . The purpose of these specialized compact discs is to make accurate tests and calibrate audio equipment .
Test.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 13 s, 432 × 288 pixels, 202 kbps overall, file size: 313 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Trinity_test.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 13 s, 321 × 240 pixels, 649 kbps overall, file size: 1,018 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
[64] [65] Users can test these programs using the list of Vorbis audio streams available on the same wiki. [66] For more information about support in software media players there is a comparison of media players available. Some newer Ubisoft games use Vorbis files renamed with the filename extension.sb0.
FAAD2 – open-source decoder for Advanced Audio Coding. There is also FAAC, the same project's encoder, but it is proprietary (but still free of charge). libgsm – Lossy compression ; opencore-amr – Lossy compression (AMR and AMR-WB) liba52 – a free ATSC A/52 stream decoder (AC-3) libdca – a free DTS Coherent Acoustics decoder