[speex-dev] Recommendations for Pre-/Post-Processing

Jean-Marc Valin jean-marc.valin at hermes.usherb.ca
Tue Apr 15 08:35:13 PDT 2003

> I just wanted to know if there are any recommendations for
> pre-/post-processing (processing power isn't a question).
> I'm aiming at 16kHz and tried an lowpass-filter at 11kHz before encoding but
> this didn't improve the results...

Well, I don't know if that what you really meant, because at 16 kHz the
Nyquist rate is 8 kHz, so there's no point in filtering at 32 kHz. At 16
kHz, the only thing I'd do is to make sure there's nothing left below 50
Hz and that's about it.


Jean-Marc Valin, M.Sc.A.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada

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