celp_codec

This is a simple CELP voice codec implementation. http://en.wikipedia.org/wiki/Code-excited_linear_prediction

Features

Encoding and decoding from multiple WAV and AIFF formats.
Support file or stdin/stdout
Real time processing, encode and decode from streams.
Configurable
- LPC order
- Frame length
- Number of subframes
- Adaptive codebook size
- Multiple frame windows ('hanning', 'boxcar', etc)
- Weighting coefficients

Dependencies

numpy
scipy
ctlibsnd (ṕython libsndfile wrapper) https://bitbucket.org/san/ctlibsnd

Future improvements

Implement fixed codebooks of different sizes
Support more sample rates (currently only 8 kHz)
Preprocesing filter (high pass, and equalization)
Convert LPC (linear prediction coefs) to LSP (linear spectral pairs)
- Quantize LSP
- Convert LSP to LPC