0. Background

This directory contains files associated with two papers published at ICASSP'02 
in Orlando, Florida, May 2002. These papers are

1. P. Alku and T. Bäckström, "All-pole Modeling Technique Based on the Weighted 
Sum of the LSP Polynomials," in Proceedings of Int Conf Acoustics Speech Sig Proc, 
Orlando, FL, May 2002.

2. T. Bäckström, P. Alku and W. B. Kleijn, "A time domain reformulation of linear 
prediction equivalent to the LSP decomposition," in Proceedings of Int Conf 
Acoustics Speech Sig Proc, Orlando, FL, May 2002.


1. Files

The directory contains six files

   lsp.m         Generate LSP Polynomials the conventional way
   lspfit.m      Subroutine for wlsp.m
   lsptd.m       Generate LSP Polynomials by reformulation of LP
   lspx.m        Subroutine for wlsp.m
   wlsp.m        Weighted-Sum LSP -model
   README.txt    This file

These functions can be used in MATLAB as is. The three most useful functions 
are lsp.m, lsptd.m and wlsp.m. The other files are merely subroutines.
Of these, functions lsp.m and lsptd.m calculate basically the same thing but
with different approaches - lsp.m calculates LSP polynomials the conventional
way and lsptd.m with the time-domain reforumlation of LP presented in paper 2.

wlsp.m calculates the WLSP-model presented in paper 1. Please note that
this application of WLSP works well only for small models (m < 30). For larger
models, the calculation of the autocorrelation of the all-pole model should be
improved.


2. Aknowledgements and Copyright

These files are provided as free examples in conjunction with the above 
mentioned articles. They are free to use as long as the authors name(s) are
mentioned. If the files are changed, the name(s) of the original authors
as well as the names of the new authors should be retained.