BlueTooth dongle versions and wireless speakers

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Man-wai Chang

Do I need 4.0?

Could I just use 2.0 and connect to all Bluetooth speakers out there?

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Man-wai Chang said:
Do I need 4.0?

Could I just use 2.0 and connect to all Bluetooth speakers out there?
Click to expand...

It's hard to find all the documentation in one place.

First, you've got the datarate of the Bluetooth. I think
it went up, when Bluetooth 2.1 came out (EDR).

Next, you've got a profile the Bluetooth uses, to
do the job. The only one I see for audio is A2DP.
Maybe there is some other one, and I just missed it.

http://en.wikipedia.org/wiki/A2DP#Advanced_Audio_Distribution_Profile_.28A2DP.29

Now, I don't know what determines how much bandwidth the
A2DP can use. Whether it's capped in some way (to promote
fairness), or it's purely a function of the CODEC.

At the next level up, is the CODEC choice. Some of the original
choices for audio CODEC, looked like they were lossy ones.
With a lossy method, you don't necessarily have good audio
fidelity. And the reason this was acceptable at first, is
because you'd be carrying cellphone audio to a cellphone
headset.

Now, for speakers, I can find a reference to a third-party
CODEC. It's mentioned in this product description.

http://www.jr.com/jaybird/pe/JBD_BAU/

"Bluetooth V2.1 / A2DP
uSport features apt-X, wired Audio quality for
Bluetooth with a cleaner, clearer, bassier music signal."

Apparently, that CODEC has a lossless option. Now, does
that depend on EDR ? Do you have higher bitrate options
with a later Bluetooth version ? I don't know the answer
to that, because I didn't find an article that went
into details about max (over air) data rate, A2DP data rate,
CODEC data rate.

http://en.wikipedia.org/wiki/Apt-X

"apt-X Lossless, a scalable, adaptive, lossless type
audio codec was announced in April, 2009"

So then the question becomes, what are the capabilities of
SBC (Sub-Band Codec) versus Apt-X ? And would the speakers
and their amplifier be of good enough quality, to care ?

Paul
 
So then the question becomes, what are the capabilities of
SBC (Sub-Band Codec) versus Apt-X ? And would the speakers
and their amplifier be of good enough quality, to care ?
Click to expand...

Never thought about the codec things....

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Man-wai Chang said:
Never thought about the codec things....
Click to expand...

Bluetooth speakers, would probably support whatever the
default is. If it is SBC, they would probably do that
in any case.

The speaker maker would likely need to buy a license to
use the apt-X option, as it comes from a third party,
and there's probably a patent. And it does take some
processing power, even if by modern standards it doesn't
seem like a lot.

In general, the documentation of Bluetooth leaves
a lot to be desired. They tried to use the concept
of "profiles", but there's still a lot of information
consumers could use, that is missing.

Paul
 
In general, the documentation of Bluetooth leaves
a lot to be desired. They tried to use the concept
of "profiles", but there's still a lot of information
consumers could use, that is missing.
Click to expand...

Maybe I should just solder myself a simple FM transmitter and use
regular FM/AM radio as wireless speaker.... :)

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Yes, you can buy those. There's probably a pretty low
limit on transmit power levels though. Some of these listed
a transmitter range of only 5 meters. Which is pretty weak.

http://www.amazon.com/STEREO-TRANSM...=dp_db_cm_cr_acr_txt?ie=UTF8&showViewpoints=1


Paul
Click to expand...

See link below for modifying these generic FM LCD transmitters to
increase the transmit range and to disable the auto power off on
silence feature.

http://www.instructables.com/id/Belkin-Tunecast-II-FM-Transmitter-Mod/?ALLSTEPS
 
Yes, you can buy those. There's probably a pretty low
See link below for modifying these generic FM LCD transmitters to
increase the transmit range and to disable the auto power off on silence
feature.
Click to expand...

No... I don't need long range, just for my own ears in my home.

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http://www.amazon.com/STEREO-TRANSM...=dp_db_cm_cr_acr_txt?ie=UTF8&showViewpoints=1

This one is designed for cars. It's expensive as well.

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