[Bluez-devel] btsco occasional loud bursts of static

[Bluez-devel] btsco occasional loud bursts of static

[Chase Douglas]

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

[Brad Midgley]

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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> https://lists.sourceforge.net/lists/listinfo/bluez-devel



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[Bluez-devel] TODO list

[Doan Chi-minh]

Hi,
We're a group of 4 french students and we have a project to do. We have 
decidec
to pick up a topic from the ToDo list but after searching on the archive, I
found that almost all things have been begun. So we would like to know if
there's any point that need development. Or maybe I'm wrong and anybody have
begin something from the ToDo list (and in this case, i apologize).
We need a precise subject because it's a work for the university.
Regards, Chi-Minh

ps : sorry if my english is not very comprehensive



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Re: [Bluez-devel] TODO list

[Brad Midgley]

Chi-minh

> We're a group of 4 french students and we have a project to do

The bluetooth audio has todo items (moving into alsa/gstreamer plugins).
I've done some of the stereo transmission work without any headset by
sending from one pc to another, so it doesn't require special hardware.

Brad


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