[speex-dev] improving microphone input

Jean-Marc Valin jean-marc.valin at hermes.usherb.ca
Thu Mar 20 15:49:35 PST 2003

Le jeu 20/03/2003 à 18:06, Daniel Vogel a écrit :
> I've been toying around with Speex' 4kbs narrowband mode and have to admit
> that I was pleasantly surprised by the quality - great job there! I noticed
> one problem though, which seems to be cleanly solved in some way with the
> XBox Live VoIP implementation - dealing with "clamped" input data when you
> put the microphone too close to your mouth or are too "loud".
> Are there clever ways to deal with this problem?

Well, it all depends on where the clamping comes from. If you get it
clamped already after the ADC, I doubt there's much to do about it
(except perhaps some smoothing but I'm not sure). If it comes from the
codec itself, maybe you can try slightly reducing the gain before the
codec input.


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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 242 bytes
Desc: signature.asc
Url : http://lists.xiph.org/pipermail/speex-dev/attachments/20030320/85ce8bd9/signature-0001.pgp

More information about the Speex-dev mailing list