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a2dp and multiple headsets

Bluez-devel JP Freeley (GMAIL-NYC) 3 participants 9 messages Feb 3, 2007 – Feb 4, 2007 Bluetooth drivers

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#0 lore raw

Pardon me if a FAQ or OT...

Is there a limit as to how many simultaneous headsets can be streaming audio?
Does anyone have suggestions about configurations, hardware, software to stream to multiple headsets?
I'm looking to "broadcast" stream to about 35 headsets simultaneously.

Thanks,

jpf

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#1 lore raw

JP

the a2dp spec has no provisions for broadcast and there are piconet size limits to deal with anyway. You'd have to set up multiple bluetooth adapters to really stack in the headsets but you'd never reach 35. You may want to try a more traditional RF broadcast.

Brad

Quoted 12 lines

Pardon me if a FAQ or OT...

Is there a limit as to how many simultaneous headsets can be streaming audio?
Does anyone have suggestions about configurations, hardware, software to stream to multiple headsets?
I'm looking to "broadcast" stream to about 35 headsets simultaneously.

Thanks,

jpf

Quoted 9 lines

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#2 lore raw

Brad --

That were my research was pointing me, but I was told that something had been done in Amsterdam....but the details I have are about that vague. I figured this list would have the definitive answers.

Am I correct that in some profiles (i.e. OPP, FTP, SPP) 1 BT device can make upto 7 simultaneous connections?

thanks,

jpf

Quoted 32 lines · Brad Midgley

JP

the a2dp spec has no provisions for broadcast and there are piconet size limits to deal with anyway. You'd have to set up multiple bluetooth adapters to really stack in the headsets but you'd never reach 35. You may want to try a more traditional RF broadcast.

Brad

Quoted 10 lines

Pardon me if a FAQ or OT...

Is there a limit as to how many simultaneous headsets can be streaming audio?
Does anyone have suggestions about configurations, hardware, software to stream to multiple headsets? I'm looking to "broadcast" stream to about 35 headsets simultaneously.

Thanks,

jpf

Quoted 10 lines

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Quoted 11 lines

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#3 lore raw

JP

Quoted 2 lines

Am I correct that in some profiles (i.e. OPP, FTP, SPP) 1 BT device can make upto 7 simultaneous connections?

OPP etc are all point-to-point profiles. You may have heard that one master device can have 7 slaves in its piconet.

Brad

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#4 lore raw

got it .. thanks again.

jpf

Quoted 10 lines · Brad Midgley

JP

Quoted 2 lines

Am I correct that in some profiles (i.e. OPP, FTP, SPP) 1 BT device can make upto 7 simultaneous connections?

OPP etc are all point-to-point profiles. You may have heard that one master device can have 7 slaves in its piconet.

Brad

Quoted 11 lines

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#5 lore raw
In reply to Brad Midgley

brad --

last question....if I indeed wanted to install 35 transmitters and 35 headsets, as crazy as that may sound, must I then worry about RF interference in the room?

you said "you'd never reach 35" and I'm not sure what my "limiting factor would be"... is it RF interference?

in general, how many BT radios (frequency-wise) can exist in a single room?

thanks,

jpf

Quoted 10 lines · Brad Midgley

JP

Quoted 2 lines

Am I correct that in some profiles (i.e. OPP, FTP, SPP) 1 BT device can make upto 7 simultaneous connections?

OPP etc are all point-to-point profiles. You may have heard that one master device can have 7 slaves in its piconet.

Brad

Quoted 11 lines

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#6 lore raw

Hi JP,

I was able to stream A2DP to two headsets simultaneously. So, in principle, you dont need 35 transmitters :). At lower a2dp bit rates the ratio may increase, i did not test it though.

Quoted 7 lines · --- "JP Freeley (GMAIL-NYC)

brad --

last question....if I indeed wanted to install 35
transmitters and 35
headsets, as crazy as that may sound, must I then
worry about RF
interference in the room?

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#7 lore raw

Thanks Sergey ---

What transmitter/headset brand/model did you use? Did you try streaming to 3?

jpf

Quoted 24 lines · Sergey Krivov

Hi JP,

I was able to stream A2DP to two headsets simultaneously. So, in principle, you dont need 35 transmitters :). At lower a2dp bit rates the ratio may increase, i did not test it though.

Quoted 6 lines · --- "JP Freeley (GMAIL-NYC)

brad --

last question....if I indeed wanted to install 35 transmitters and 35 headsets, as crazy as that may sound, must I then worry about RF interference in the room?

____________________________________________________________________________________
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Quoted 11 lines

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#8 lore raw

JP,

IBM T40 internal bluetooth vs HP stereo bluetooth headset and Motorola HT820 headset. No, i did not try with 3, i had just two headsets, but it should not be difficult to try if you have them.

Quoted 11 lines · --- "JP Freeley (GMAIL-NYC)

Thanks Sergey ---

What transmitter/headset brand/model did you use? Did you try streaming
to 3?

jpf

Quoted 2 lines · Sergey Krivov

Hi JP,

Quoted 24 lines
Quoted 3 lines

I was able to stream A2DP to two headsets simultaneously. So, in principle, you dont need 35 transmitters :). At lower a2dp bit rates the ratio

may

Quoted 3 lines

increase, i did not test it though.

--- "JP Freeley (GMAIL-NYC)" <[email protected]>

Quoted 15 lines · wrote:
Quoted 10 lines

brad --

last question....if I indeed wanted to install 35
transmitters and 35
headsets, as crazy as that may sound, must I then
worry about RF
interference in the room?

____________________________________________________________________________________

Quoted 6 lines
Quoted 5 lines

TV dinner still cooling?
Check out "Tonight's Picks" on Yahoo! TV.
http://tv.yahoo.com/

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web services, security?

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Get stuff done quickly with pre-integrated

technology to make your job easier.

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Download IBM WebSphere Application Server v.1.0.1

based on Apache Geronimo

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Quoted 5 lines
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Quoted 1 line

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