Optimization team update (11/23 ~ 11/29)

Steve Mosher steve at openmoko.com
Wed Dec 10 05:23:53 CET 2008

yes joerg has a DRAFT version of the SOP for the buzz fix rework of 
A5/A6. Not everybody has the buzz issue.

1. It's a draft.
2. We need to have some independent test of the SOP

arne anka wrote:
>>>> "buzz / echo / hiss"... no software change can fix buzz.  It's baked
>>>> into the hardware and you will have to do fairly extreme meddling
>>>> with your soldering iron to impact it.
>>> Thanks, I hadn't seen that so clearly stated before!  (i.e. that buzz
>>> is known to be 100% a hardware issue).
> probably since everyone expects everyone else to know it :-)
> it was a hot topic some months ago, then someone (jörg?) came up with the  
> definite statement that it is hw related.
> since then we're all waiting for working and more or less easy diy fix --  
> which seems to be reached now.
>> weird though .. as I never experienced buzz in my calls (although I
>> have to admit I didn't make more than 10 calls max uptill now)
> plug in the wired headset ...
>>>> "Echo" reacts to some tweaking in alsa and maybe Calypso firmware
>>>> option selection, I guess this turn up in rootfs images as best it
>>>> can.
>>> OK, but do you need to be so imprecise about this?  What can't there
>>> be a definitive solution?
> because the echo is caused only partially (if at all) by hardware.  
> especially gsm 1800 providers like e-plus in germany have been reported as  
> echo prone.
> additionally people reported different experiences depending on their  
> location in time and space.
> and last but not least: nobody knews what exactly N0187 is doing, and if  
> it will live trough firmware updates, since it is not documented.
> since echo is a very complex issue, there are more then just one solution  
> more or less working for more or less people ...
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