speech compression ,lpc to lsf using poly2lsf

hi,

this is my code for speech compression . i have two more blocks to write lbg codebook, and vector quantisation. till here iam getting error in lptolf file like this

          Error using ==> roots at 28
  Input to ROOTS must not contain NaN or Inf.

Error in ==> poly2lsf at 33
if (max(abs(roots(a))) >= 1.0),

Error in ==> lptolf at 4
   lsfcoeff(i,:)=poly2lsf(ssig(:,i));

Error in ==> s2 at 15
[lsfcoeff]=lptolf(ssig,C3);

so where iam going wrong i couldn't understand

s2.m s my main file. before adding lptolf file everything fine.test.wav s my sound file of single channel.

thanks in advance.

[Walter Roberson]

At the MATLAB command line, command

dbstop if naninf

and then run your code. When it stops, it will be at a line that produced a nan or inf result. You need to work backwards from there to figure out why it produced those results.

My speculation would be that it is occurring in filter(), as a result of you passing in incorrect filter coefficients because of some circumstance that you did not take into account.