Gumstix is aware of this quality concern re audio output on the Overo series.

The company engineers are actively working on a resolution and we will let the community know shortly.


Don
@ Gumstix
========================

On Wed, May 13, 2009 at 8:44 PM, Eric Sorensen <ravix475@gmail.com> wrote:
In my experience, the audio was extremely noisy on the summit expansion board and there was no way of getting around it.

If you find the solution I'd love to hear it.

I did look at the PCB of the summit board and the analog ground seems to run over lots of lines carrying data, I think this may be a significant source of the noise.


On Thu, May 14, 2009 at 12:42 AM, David Woodhouse <dwmw2@infradead.org> wrote:
I have what I think is an Overo Air with Summit expansion board -- the
ones which were given out at the Linux Kernel Summit last year.

I'm having problems with audio output. I'm using aplay to play a 16-bit
44.1kHz .wav file through headphones, and there's a _lot_ of white
noise. It's especially noticeable after I hit ^C on aplay, when it
continues for 5 seconds before going silent.

This happens whether I'm reading the file from the SD card or from an
external USB hard drive. I've tried disconnecting the latter, as well as
leaving the wireless interface dormant.

Is there anything I can do to get rid of the noise? I've tried all the
mixer settings, some of which briefly seemed to make a difference but
not for long.

Also, I can't get the USB hard drive to work in the 'host' port; only in
the 'OTG' port. The same cable should work for both, shouldn't it? The
drive has external power.

My plan for this board is to fit it in my car running mpd, using one USB
port for the hard drive and another for a 'car2pc' adapter. I'm starting
to wonder if I should get a self-powered USB hub, and attach both those
devices _and_ a USB audio device through it.

--
dwmw2


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