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32kpbs public listening test

Written by Lasse Penttinen @ 05 Jul 2004 11:06 User comments (2)

32kpbs public listening test Roberto Amorim keeps pushing new audio quality comparisons with a steady pace. Now it is time to focus to ultra low bitrates around 32kbps. Even though storage capacity is constantly getting cheaper and more widely available, there is still plenty of uses for a low bitrate compression.
With most modern formats reaching transparency, or getting close to it, at 128kbps as my Multiformat at 128kbps listening test demonstrated, the real arena where codecs are competing, and most development is going, is at low bitrates. There are important reasons for that: dial-up streaming, storage savings, bandwidth savings for the streaming station... such low bitrates can also be useful for 1 CD DVD rips.
This test's purpose is simulating a dial-up streaming feed. For that reason, bitrates are kept at 32kbps CBR, and VBR isn't being used.

The encoders and parameters tested are:
  • LAME encoder 3.96 -b 32
  • Ahead HE AAC+PS 32kbps CBR High Quality
  • Ogg Vorbis post-1.0.1CVS --managed -b 32 resampled with SSRC
  • Real Audio 32kbps stereo music codec in Helix Producer 10
  • QDesign Music Codec 2 Pro 32kbps at 32kHz, Quality mode
  • Microsoft WMA9 Std 32kbps at 32kHz
  • MP3pro 32kbps at 32kHz, in Adobe Audition 1.5
  • High anchor lowpassed at 7kHz with Sox 12.17.4
  • Go to in order to participate.

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    2 user comments

    16.7.2004 6:16

    32kbps is about telephone quality right?

    215.7.2004 13:39

    "Usual telephone lines provide a typical data rate of about 28.8 kbps (ITU-T V.34)."

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