Difference between revisions of "Hydrogenaudio Listening Tests"

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(make the changes I described in the Listening Test forum)
(External Tests: Strike thru on some dead links on External Tests links.)
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Other people have held listening tests in venues outside of Hydrogenaudio (although the organizers of the tests tend to be HA members :).  The results of these tests are found below:
 
Other people have held listening tests in venues outside of Hydrogenaudio (although the organizers of the tests tend to be HA members :).  The results of these tests are found below:
  
* [http://ff123.net/ ff123's site on audio testing and listening tests] (most recent test 2002-07-27)
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* <s>[http://ff123.net/ ff123's site on audio testing and listening tests]</s> (most recent test 2002-07-27)
* [http://www.rjamorim.com/test/index.html Roberto's Public Listening Tests] (most recent test 2004-07-11)
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* <s>[http://www.rjamorim.com/test/index.html Roberto's Public Listening Tests]</s> (most recent test 2004-07-11)
 
* [http://listening-tests.hydrogenaudio.org/sebastian/ Sebastian Mares' Listening Tests] (most recent test updated 2008-11-22)
 
* [http://listening-tests.hydrogenaudio.org/sebastian/ Sebastian Mares' Listening Tests] (most recent test updated 2008-11-22)
 
* [http://www.soundexpert.info/ SoundExpert Listening Tests] (continually updated)
 
* [http://www.soundexpert.info/ SoundExpert Listening Tests] (continually updated)

Revision as of 15:16, 14 December 2012

One of the most visible ways that HydrogenAudio members have shown their enthusiasm for audio quality and their respect for scientific principles over the years is by organizing and participating in public blind listening tests of lossy codecs and presenting statistical analyses of the results. These results show the advantages and disadvantages of different formats and encoders and help identify which are "state of the art."

Private listening tests also provide useful data, but the public HydrogenAudio tests are a rarity in having enough participants to both average out variations among individual listeners and still have statistically significant results.

Note that a listening test cannot really compare formats or encoder "brands." Instead, it compares particular versions of particular encoders at particular bitrates. Results will differ with different encoders, newer versions of the same encoders, or different bitrates. Use caution when extrapolating, and use the most recent results when extrapolating to the newest encoder versions.

Note: There would be no point in listening tests of lossless encoders; the decoded results are bit-identical to the original uncompressed recordings. Lossless encoder comparisons instead consider technical aspects such as compression ratio and encode/decode speed.

All tests are sorted by date, newest first. All dates are in ISO8601 format.

Multiformat Tests

Date Title
Samples
Performed by Codecs Links
2011-04-10 64-kbps
General
igorc Vorbis aoTuV, Quicktime HE-AAC, Opus HA Thread
Complete Result
2007-08-16 64-kbps
General
Sebastian Mares Vorbis aoTuV, Nero AAC,
WMA Pro
HA Thread
Complete Result
2006-11-22 48-kbps
General
Sebastian Mares Vorbis aoTuV, Nero AAC,
WMA Pro, WMA Standard
HA Thread
Complete Result
2006-01-13 128-kbps
General
Sebastian Mares iTunes & Nero AAC, LAME MP3,
Vorbis aoTuV, WMA Pro
HA Thread
Complete Result

Single-format Tests

AAC

Date Title
Samples
Performed by Codecs Links
2011-08-20 96-kbps
General
igorc CT, Fraunhofer IIS, Nero, QuickTime TVBR & CVBR HA Thread
Complete result
2006-02-20 48-kbps HE-AAC
General
Gabriel 3gpp (v1), CT (v1 & v2), Nero (v1 & v2) HA Thread
Complete Result
2006-02-05 48-kbps HE-AAC
Classical
Ivan Dimkovic Nero HE-AAC v1 & v2 HA Thread


MP3

Date Title
Samples
Performed by Codecs Links
2008-10-17 130-kbps
General
Sebastian Mares LAME 3.97, LAME 3.98.2, iTunes, FhG, Helix HA Thread
Complete Result

External Tests

Other people have held listening tests in venues outside of Hydrogenaudio (although the organizers of the tests tend to be HA members :). The results of these tests are found below: