Roberto's public listening tests page

Welcome, and thank-you for your interest in my tests.

The recent developments in perceptual audio coding, including new formats like AAC, Ogg Vorbis, Musepack and Windows Media Audio, have brought competition to an arena formerly completely dominated by MP3. Users want to check out these novelties, but frequently stumble over the doubt of "What to choose?".

One of the most importat aspects to consider about a format is it's sound quality. Undesired artifacts like hissing, "pre echo" and "stereo collapse" can ruin the pleasure of the listening experience.

One of the most acclaimed methods of comparing codec quality is by performing so-called "Double Blind Listening Tests". In this sort of test, the participant compares various encoded samples against each other and against an uncompressed reference sample. The blind part means that the participant doesn't know which sample was encoded by which encoder. That guarantees there'll be no psychological bias towards his/her favorite codec, or against the codec he/she dislikes.

The purpose of this page is hosting the public tests I conduce from time to time. This includes hosting instructions, results, graphs, etc.

You can now subscribe to the listening tests announcement newsletter. Check the link for more details.

You can download all samples used in my listening tests here. They were encoded with WavPack.

NEW: You can download my entire listening test packages (except for the first AAC @ 128kbps, which I lost...) here.

The currently open test is: there's no listening test open at the moment

Here are the tests I conduced so far:


Aknowledgements: I would like to thank the following people

Roberto Amorim - design by Dibrom homepage