[Speex-dev] Noisy sound quality with Blackfin in WB-mode

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Thu Nov 3 04:50:23 PST 2005

Hi Bernhard,

Got any luck with the Blackfin stuff? One thing I forgot mentioning that
would probably help a lot in narrowing down the bug is to simply disable
assembly functions one by one and see which one breaks Speex.


Le mercredi 26 octobre 2005 à 17:35 +0200, Bernhard Gerlach a écrit :
> Hello Jean-Marc,
> > Could you try mixing the encoders and decoders (encode with one  
> > version,
> > decode with the other) to see whether the problem is in the  
> > encoder, the
> > decoder or both.
> I tested that,and the results are: The fixedpoint+blackfin encoder  
> used together with the fixedpoint-only decoder produces an bad  
> sounding file (for all the combinations for quality and complexity I  
> mentioned in my previous postings, and also for both WB and UWB mode).
> The combination fixedpoint-only encoder together with the fixedpoint 
> +blackfin decoder results in good sounding files.
> > A couple things worth checking: try with WB quality 5 and 8. Do  
> > both of
> > these have a problem (they use a different scheme). Also, with Speex,
> > it's possible to encode in NB and decode in WB and vice versa.  
> > Could you
> > try that too? With all this information, I should have a good idea of
> > where the problem is.
> I tried the WB with 5 and 8 for quality what leads to the same  
> results for fixedpoint+blackfin encoder/decoder: bad sounding file.  
> Sound was good when quality 5 or 8 was used with fixedpoint-only  
> encoder/decoder.
> I also tried the --force-XY options supported by the decoder. But I  
> couldn't finish the tests til now, because I got files with wrong  
> overall playing time entries in the wav-header for some --force- 
> options. I'm not finished trying to reproduce this behaviour on a x86/ 
> PC. So, unfortunately no results for this so far.
> Bernhard Gerlach
> Technical University Ilmenau
> Germany
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