[Speex-dev] Noisy sound quality with Blackfin in WB-mode
bernhard.gerlach at stud.tu-ilmenau.de
Wed Oct 26 08:35:37 PDT 2005
> Could you try mixing the encoders and decoders (encode with one
> 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
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.
Technical University Ilmenau
More information about the Speex-dev