[Speex-dev] How Can I Get involved in Speex Fixed-PointDevelopment?

[Jim Crichton]

There is a port for the TI C55X, in the TI directory of the source tree.  This builds and runs directly on the TI C55x simulator (Code Composer).  I have run this on the Spectrum Digital C5509A EVMPLUS board, by modifying some of the sample audio drivers (I could provide some details if you chose that board).  You can certainly get started in the simulator.

The Speex port does not include any assembly optimization for TI, so that is an area that you might be interested in.  If you are considering the Speex echo canceller, that could greatly benefit from a TI-optimized FFT.  I have not used the preprocessor myself.

You should plan on providing external memory for your DSP if you are doing more than the basic codec.  Speex runs fairly efficiently in C on TI DSPs, but it has a big footprint.

I hope this in helpful in getting started with the DSP target.  I will defer to Jean-Marc on how to contribute to the project.

Regards,

Jim Crichton

  ----- Original Message ----- 
  From: Quirion, Jean 
  To: speex-dev at xiph.org 
  Sent: Thursday, July 19, 2007 8:04 AM
  Subject: [Speex-dev] How Can I Get involved in Speex Fixed-PointDevelopment? 


  Hi,

  My name is Jean Quirion and I am a DSP engineer. Currently I am
  working on a project where it is desired to implement a VoIP solution
  over a GSM GPRS link. I would like to use Speex as the vocoder for
  this application. This application would require the Speex
  encoder/decoder and possibly the pre-processor to run on a low power
  fixed-point DSP such as a TI C55x.

  Thus, I am interested in getting involved in the fixed-point
  implementation of Speex. I feel I can contribute significantly to the
  Speex project while effectively developing a vocoder solution for my
  project.

  Can you tell me how I can get started? I looked at the list of tasks
  on the Seepx wiki and I find that the following would be best suited
  for my interests:

  Complete fixed-point (DSP development)
  .       Rest of the narrowband modes
  .       Preprocessor (noise suppression, AGC)
  .       Jitter buffer

  Please let me know how to move forward. Where does the Speex vocoder
  fixed-point implementation stands? Has if been successfully ported and
  tested onto a TI DSP evaluation board (i.e. an EVM)? If not, and if it
  can be helpful, I would be interested in tackling that task.

  Sincerely,


  Jean Quirion


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