[Speex-dev] how to fix high freq noise?

Jean-Marc Valin jean-marc.valin at usherbrooke.ca
Wed Jan 7 20:29:52 PST 2009

What version did you use. Some older releases had encoder-side issues
with some times, but that should be fixed now.


Jason Hennigar a écrit :
> Hi Masakazu,
> I have reproduced the Speex high frequency noise issue on a Blackfin 537 
> by sending 'silence' into the Speex fixed point encoder. By recording 
> the Speex decoder output and plotting the spectrum using Audacity the 
> following two frequencies.
> 1596Hz at -31.3dB
> 3200Hz at -48dB
> These two frequencies are present in both Narrow Band and Wide Band 
> modes. I've tried a number of different configurations and these two 
> frequencies are always present (quality set to 10 or default, the 
> complexity set to default, perceptual enhancement turned on or off). I 
> have not determined how to correct this problem but wanted to provide 
> additional information.
> Cheers!
> Jason
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