Bluetooth headsets to the rescue

Simon Kagstrom simon.kagstrom at
Sat Mar 21 12:38:21 CET 2009

On Sat, 21 Mar 2009 11:23:40 +0300
Paul Fertser <fercerpav at> wrote:

> >   Another (I guess unrelated) problem I have is that the sound
> > through the headset is quite bad. I hear a faint echo of myself and
> > the sound has a sharp "metallic" tone to it. My girlfriend in the
> > other end also complained that the sound was so low that it was
> > difficult to hear the conversation.
> Are you sure the echo of yourself is definetely bluetooth-related?
> Because there're quite some cases in gsm communications where one can
> hear echo of his voice, i had this myself numerous times using regular
> dumb cell phone.

No, I'm not sure. It might not be bluetooth-related, but perhaps is
caused by the mixer settings. I don't hear my own echo when talking
without the bluetooth headset though.

> As to the low signal fed to calypso, well, just look at the sound
> routing diagram and tweak mixer settings, i guess that's an easy one
> to fix.

Yes, and maybe the metallic sound is possible to fix with this as well.
I've tried changing mixer settings in alsamixer somewhat at random
(basically turning all knobs), but wihtout getting any real
improvement. Anyway, I'm sure it's possible to get this working some
way and at least for me it would be a huge usability improvement of the

// Simon

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