[From nobody Sat Feb 28 16:04:37 2009
From: Joerg Reisenweber <joerg@openmoko.org>
To: gta02@lists.internal.openmoko.org
Subject: Re: [gta02] A6+Om2008.12 audio quality part test. Mic path OK
Date: Mon, 16 Feb 2009 06:15:19 +0100
User-Agent: KMail/1.9.10
Cc: Matt Hsu <matt_hsu@openmoko.org>, testing@openmoko.com,
	Wendy <wendy_hung@openmoko.com>, Marek Lindner <marek@openmoko.com>
References: <200902132147.03745.wendy_hung@openmoko.com>
	<200902131902.57311.joerg@openmoko.org>
	<4998D80C.2080509@openmoko.org>
In-Reply-To: <4998D80C.2080509@openmoko.org>
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Am Mo  16. Februar 2009 schrieb Matt Hsu:
>=20
> > Please attach gsmhandset.state file so we all can learn how other=20
important=20
> > controls are set up.
> >  =20
> Hi Joerg and teat team,
>=20
> I post the update on the trac. Here is the link:
>=20
> https://docs.openmoko.org/trac/ticket/2121
>=20
> Matt

I checked this gsmhanset.state for microphone path.
I confirm it uses correct routing according to=20
http://people.openmoko.org/joerg/ALSA/doc/WM8753_control_diag_gsmhandset_mi=
c_std.png

=46or even further reducing white noise I suggest to modify level adjustmen=
ts as=20
follows:
control.48 0->3 =20
control.12 7->5
control.5 101-> (10..70) [[reduce until you get same sensitivity as before]]



reasoning:=20
calypso has a microphone input which is *very* sensitive -> we don't want t=
o=20
drive it with 101/128 of a ~3Vpp output of WM8753 -> set control.5 to low=20
value.
WM8753 wants internal level of -6dB for best results, mic2 has output of -4=
8dB=20
(iirc) -> set control.48 mic boost to max. (If WM8753 gets >0dB due to this=
=20
setting, we will hear distorted sound that feels sharp and aggressive. If=20
this happens, reduce control.48 from 3 to 2, then re-adjust control.5=20
accordingly)
control.12 ST2MOVOL has a range from -15dB..+6dB in 3dB steps, we don't wan=
t=20
to change internal level here, so we set to 5 =3D=3D 0dB



Will check earpiece receiver path and level setting later today, as well as=
=20
possible unwanted sidetone pathes.


cheers
jOERG

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