[Speex-dev] Problem encoding sine wave in 1.1.6 and somewhat in 1.0.4

[Jean-Marc Valin]

Hi Jared,

Just to let you know that this behavior got fixed in the 1.1.8 release.

	Jean-Marc

Le jeudi 13 janvier 2005 à 14:19 -0500, Jared Whitby a écrit :
> Well I think a sinusoid shouldn't totally trash the encoder state, so
> I still think theres a bug lurking around in there. The denoiser just
> prevents it from ever making it to the encoder. Just from browsing
> through the speex code and from what I've learned reading through the
> mailing list, it looks like there are a few places where checks are in
> place to prevent sinusoids from destabilizing the stream. Somehow this
> particular sine wave is getting through the cracks I think. I actually
> tried a couple of lower frequency samples and It didn't seem to cause
> the problem I was having.
> 
> But, I seem to be in good shape with the filter in place... so just
> figured I would share what i have learned.
> 
> Jared
> 
> 
> On Thu, 13 Jan 2005 19:40:11 +0100, Claude Brisson <claude at renegat.net> wrote:
> > On Thu, 2005-01-13 at 12:42 -0500, Jean-Marc Valin wrote:
> > > Le jeudi 13 janvier 2005 à 10:59 -0500, Jared Whitby a écrit :
> > > > Interestingly enough.. I started playing around with preprocessing
> > > > options in 1.1.6 and happened upon the denoise filter
> > > > (SPEEX_PREPROCESS_SET_DENOISE). When i run the test tone using that
> > > > option it is completely filtered out and I just get (complete)
> > > > silence. When the test tone is intermixed with regular voice I only
> > > > get the voice. So while i still don't quite understand why the test
> > > > tone dorks up the encoder, it looks like I have a way around it.
> > >
> > > Well, the denoiser is designed to remove any kind of stationary
> > > background noise. You sinusoid fits that definition pretty well :-)
> > >
> > >       Jean-Marc
> > 
> > The "Is is a bug? No, it's a feature" has just make another victim!
> > 
> > Claude
> > 
> > 
> 
> 
-- 
Jean-Marc Valin <Jean-Marc.Valin at USherbrooke.ca>
Université de Sherbrooke