Difference between revisions of "Speex"

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== External links ==
== External links ==
* [[Applications that use Speex]]
* [[Applications that use Speex]]
* [[Games that use Speex]]
* [[Wikipedia: Speex]]
* [[Wikipedia: Speex]]

Revision as of 17:25, 24 December 2014

Speex is deprecated; Xiph recommends you use Opus instead


The Speex homepage has all the project info.


See Speex hardware for a partial list of supported hardware


These are some improvements that could be made to Speex. Let us know if you'd like to work on one of them.

  • Speech/signal processing (DSP design)
    • Improve noise suppression (get rid of musical noise) and residual echo suppression
    • Improve packet-loss concealment (PLC)
    • Re-write the built-in voice activity detector (VAD)
    • Improve the 2.15 kbps vocoder mode (there are even 4 unused bits left to use)
    • Algorithmic optimizations (see if some searches can be simplified/approximated)
  • Complete fixed-point (DSP development)
    • Wideband
    • VBR
    • Rest of the narrowband modes
    • Preprocessor (noise suppression, AGC)
    • Jitter buffer
    • Arch-specific optimization
    • More...
  • Tune (playing with parameters)
    • Noise weighting filter
    • Perceptual enhancement
  • Features (plain C programming)
    • Implement maximum VBR bit-rate
    • Implement peeling (write functions to strip some of the bits)
      • Peel high-band (wideband -> narrowband)
      • Transform 24.6 kbps mode to 15 kbps mode
  • Documentation
    • Use questions from the mailing list to create a better FAQ on the wiki
    • Update the Speex manual based on recent papers
    • Improve libspeex documentation
    • Write good example code

External links