Volume controls

Al Johnson openmoko at mazikeen.demon.co.uk
Mon Nov 24 23:04:28 CET 2008

On Sunday 23 November 2008, Michael 'Mickey' Lauer wrote:
> Am Sunday 23 November 2008 18:51:28 schrieb Dieter Spaar:
> > Michael 'Mickey' Lauer wrote:
> > > Am Saturday 22 November 2008 21:37:22 schrieb Al Johnson:
> > >> Can we also have a way to check the echo suppression status please?
> > >
> > > I agree, a query command for that would be helpful.
> > > Dieter?
> >
> > OK, I will see what can be done and add it to the todo-list for "moko11".
> Thanks.


> > BTW, anyone already checked if the echo cancellation command ("AT%Nxx")
> > really does something useful ?
> Oh they do. The change is audible. It's still no clear which of the
> settings provide the best compromise though. I have studied said part of
> the code, but I'm wondering whether you can toggle echo cancellation and
> noise reduction completely independent or whether one category of these
> commands always turn off the other category and whether N0187 is the only
> one that toggles both ON, e.g. it's unclear whether you can set both to ON
> but with varying reduction (-6,-12,-18). What do you think?

The numbers look like a bitmask with -18 being both -6 and -12 enabled, and 
echo suppression separate from noise reduction. IIRC the values that ought to 
control them separately are unrecognised though.

There have also been reports of the echo returning after the first call, so it 
would be good to know what might clear these settings.

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