PeteS
Guest
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 Posted:
Sun Dec 04, 2005 5:35 pm Post subject:
Re: How can I measure jitter? |
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Don Bowey wrote:
| Quote: | On 12/2/05 11:26 PM, in article c8a.439148ae.db87e@clunker.homenet, "Jasen
Betts" <jasen@free.net.nospam.nz> wrote:
On 2005-12-01, Anthony Fremont <spam@anywhere.com> wrote:
"Don Bowey" <dbowey@comcast.net> wrote
There is no "audio signal" transported on Bluetooth.
Really? Are you sure about that?
They use something like that for wireless headsets.
Bye.
Jasen
"Something like that" gets used for lots of things. But maybe what you are
thinking of is something like Bluetooth transporting a digital bit-stream of
encoded audio.
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Bluetooth has two data channels.
The ACL (Asynchronous) channel is usually operated in a serial port
style (especially when used as a cable replacement). The SCO
(Synchronous) channel is nominally designed for audio (and meets ISDN
data rate specs for that, as well as the normal audio rate PCM highway
for both 8 and 16 bit samples).
The data rates and latency are usually dependent on the software stack
for ACL. The SCo channel is buried deep to give a guaranteed data rate.
I have achieved up to 19k2 fairly simply on the ACL channel. I use the
SCO channel for digitised audio with 16 bit samples, and it works just
fine. The ACL channel is also active at that time (indeed, it needs to
be in most applications as commands such as volume controls are passed
over the ACL link).
So Boki needs to tell us which channel he is using.
Cheers
PeteS
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