Speex dev - Jan 2006 - Echo cancel problem with 1.1.11

Hi,

 

  We are having problems with echo cancel in 1.1.11 that we didn't have with
1.1.10. Doing sound tests (just saying "check, test" for about 30
seconds),
we hear electronic noise and at some point the algorithm goes wild and the
residue samples returned by the echo cancel become so big they become bigger
than the floating point range (all values in the residue buffer are
"nan" or
"not a number"). Then we have to reset the echo cancel otherwise
everything
hangs (i.e. the preprocess becomes really slow trying to handle "nan"
and
the echo cancel never comes back on its own). I can make it consistently
crash with 1.1.11 but I cannot reproduce it with 1.1.10. Any idea of what
could cause this?

 

Regards.

 

"Intellectuals solve problems,

geniuses prevent them.", Einstein

-----------------------------------------

Martin Lamothe <Martin.Lamothe@sess.ca>

SESS Canada (450)653-9669

-----------------------------------------

 

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Salut Martin,
>   We are having problems with echo cancel in 1.1.11 that we didn?t
> have with 1.1.10. Doing sound tests (just saying ?check, test? for
> about 30 seconds), we hear electronic noise and at some point the
> algorithm goes wild and the residue samples returned by the echo
> cancel become so big they become bigger than the floating point range
> (all values in the residue buffer are ?nan? or ?not a number?). Then
> we have to reset the echo cancel otherwise everything hangs (i.e. the
> preprocess becomes really slow trying to handle ?nan? and the echo
> cancel never comes back on its own). I can make it consistently crash
> with 1.1.11 but I cannot reproduce it with 1.1.10. Any idea of what
> could cause this?
I've no idea what causes this and I've seen it before. I also have no
idea why, but it appears to be fixed in the current svn version. Please
try that and see if the problem goes away (it should).

	Jean-Marc