Re: [Bluez-devel] btsco occasional loud bursts of static

[Brad Midgley <bmidgley@xmission.com>]

Chase

One thing to check is the code we have to accommodate a byte getting
lost. If we don't watch for this, subsequent samples have what should be
a high byte in the low position and vice-versa, so the result is loud
noise for the remainder of the connection.

I haven't looked closely at this, but it's really baffling to think a
single byte could be lost from a stream of 16-bit samples like that. The
protocol should drop entire samples when the signal is bad--losing
*half* a sample is a worst-case scenario.

Brad

> I have a dlink dbt-120 rev. b4 bluetooth adapter with a motorola hs850
> and I use btsco to talk with people online. When I have my laptop
> sitting on my lap, everything works fine. However, when I start to walk
> around, the sound transmitted to the other person from my headset will
> have bursts of loud static. I am guessing that this is a problem with
> the connection being worse. I would like to get this resolved, and I can
> do some coding as well. I have a 2 MB hcidump which somewhere near the
> end has the offending sound packets. I can't find any documentation on
> the SCO protocol, so I can't find where the static was. Can anyone point
> me in the right direction?
> 
> Thank you,
> Chase Douglas
> 
> 
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