Speex

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== About ==
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{{historical}}
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The Speex project maintains a patent-clear audio codec designed for compressing speech data.
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= Speex is deprecated; Xiph recommends you use [[Opus]] instead =
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== Website ==
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The [http://www.speex.org/ Speex homepage] has all the project info.
 +
 
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== Hardware ==
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See [[Speex hardware]] for a partial list of supported hardware
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== Tasks ==
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These are some improvements that could be made to Speex. Let [mailto:speex-dev@xiph.org us] know if you'd like to work on one of them.
 +
 
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* 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)
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** 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
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** 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 ==
== External links ==
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[http://www.speex.org Speex homepage]
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* [[Wikipedia: Speex]]
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[[Category:Speex]]

Revision as of 20:22, 24 July 2013

This page is currently inactive and is kept primarily for historical interest.

Contents

Speex is deprecated; Xiph recommends you use Opus instead

Website

The Speex homepage has all the project info.

Hardware

See Speex hardware for a partial list of supported hardware

Tasks

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

Retrieved from "http://wiki.xiph.org/Speex"
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