[Bluez-users] how to use BT headset as microphone and the souncard as output

[Bluez-users] how to use BT headset as microphone and the souncard as output

[Laurent Lesage]

Well, this is not really a BT problem but I would like to use my BT 
headset as microphone and allow the sound to go out through the 
soundcard of the computer. So the BT headset would be like a wifi 
microphone. Cool for presentation, training or conference. But, as far 
as I tried, I cannot link the sound card and the BT headset, which uses 
USB via dongle.

Any idea or link?? (Linux OS)

Laurent


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Re: [Bluez-users] how to use BT headset as microphone and the souncard as output

[Laurent Lesage]

Well, I have part of the answer. I just used " cat /dev/dsp1 > /dev/dsp"=20
to re-route from the BT headset to the sound card. It works but there is=20
a delay of around one second : this is annoying if it has to be used for=20
a conference or training.

What is this delay due to?

Any idea appreciated :-)

Laurent

Laurent Lesage a =E9crit :

> Well, this is not really a BT problem but I would like to use my BT=20
> headset as microphone and allow the sound to go out through the=20
> soundcard of the computer. So the BT headset would be like a wifi=20
> microphone. Cool for presentation, training or conference. But, as far=20
> as I tried, I cannot link the sound card and the BT headset, which=20
> uses USB via dongle.
>
> Any idea or link?? (Linux OS)
>
> Laurent
>
>
> -------------------------------------------------------
> SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
> from IBM. Find simple to follow Roadmaps, straightforward articles,
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ick
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> https://lists.sourceforge.net/lists/listinfo/bluez-users
>
>



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Re: [Bluez-users] how to use BT headset as microphone and the souncard as output

[Tony Clark]

On Sun, 2005-06-26 at 23:26 +0000, Laurent Lesage wrote:
> Well, I have part of the answer. I just used " cat /dev/dsp1 > /dev/dsp=
" =

> to re-route from the BT headset to the sound card. It works but there i=
s =

> a delay of around one second : this is annoying if it has to be used fo=
r =

> a conference or training.
> =

> What is this delay due to?
> =

> Any idea appreciated :-)
> =

> Laurent
> =

> Laurent Lesage a =C3=A9crit :
I think from memory the best you will get it down to is around .5sec.  A
BT mic is probably not want for doing presentations, a normal wireless
mic should be much better.

tony



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Re: [Bluez-users] how to use BT headset as microphone and the souncard as output

[Laurent Lesage]

Tony Clark a =C3=A9crit :

>On Sun, 2005-06-26 at 23:26 +0000, Laurent Lesage wrote:
> =20
>
>>Well, I have part of the answer. I just used " cat /dev/dsp1 > /dev/dsp=
"=20
>>to re-route from the BT headset to the sound card. It works but there i=
s=20
>>a delay of around one second : this is annoying if it has to be used fo=
r=20
>>a conference or training.
>>
>>What is this delay due to?
>>
>>Any idea appreciated :-)
>>
>>Laurent
>>
>>Laurent Lesage a =C3=A9crit :
>>   =20
>>
>I think from memory the best you will get it down to is around .5sec.  A
>BT mic is probably not want for doing presentations, a normal wireless
>mic should be much better.
>
>tony
>
> =20
>
A BT headset is more comfortable and leaves your hands free. A small=20
wireless mic is not as cheap as BT headset. (and I don't own the first=20
but the second!)

Thank you for the information

Laurent



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Re: [Bluez-users] how to use BT headset as microphone and the souncard as output

[Brad Midgley]

Laurent,

SCO is designed to be low-latency. Usually if you want that low latency, 
you use the pcm i/o from the bluetooth chip directly to your 
application. That's not really an option with a general purpose computer.

The latency you get is from putting sco onboard the hci bus and the 
computer pulling it through the hci stack, but mostly squeezing it 
through kernel space/audio drivers a couple of times. you might try dd 
with a small bs instead of cat to see if that helps.

Brad

Laurent Lesage wrote:
> Well, I have part of the answer. I just used " cat /dev/dsp1 > /dev/dsp" 
> to re-route from the BT headset to the sound card. It works but there is 
> a delay of around one second : this is annoying if it has to be used for 
> a conference or training.
> 
> What is this delay due to?
> 
> Any idea appreciated :-)
> 
> Laurent
> 
> Laurent Lesage a écrit :
> 
>> Well, this is not really a BT problem but I would like to use my BT 
>> headset as microphone and allow the sound to go out through the 
>> soundcard of the computer. So the BT headset would be like a wifi 
>> microphone. Cool for presentation, training or conference. But, as far 
>> as I tried, I cannot link the sound card and the BT headset, which 
>> uses USB via dongle.
>>
>> Any idea or link?? (Linux OS)
>>
>> Laurent
>>
>>
>> -------------------------------------------------------
>> SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
>> from IBM. Find simple to follow Roadmaps, straightforward articles,
>> informative Webcasts and more! Get everything you need to get up to
>> speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click
>> _______________________________________________
>> Bluez-users mailing list
>> Bluez-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bluez-users
>>
>>
> 
> 
> 
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> from IBM. Find simple to follow Roadmaps, straightforward articles,
> informative Webcasts and more! Get everything you need to get up to
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> _______________________________________________
> Bluez-users mailing list
> Bluez-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-user
> s


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