[ltp] Best Wireless Headphone with Thinkpad and Linux?

[David A. Desrosiers]

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On Sun, 2006-09-03 at 08:32 -0400, James Knott wrote:

> I guess HP believes in myths.=20

Apparently they do, but significant (non-vendor-sponsored) research has
already disproved this several years ago. Bluetooth has changed a LOT in
the last 4.5 years since this HP article was published.

Not only are Bluetooth devices FAR too weak to affect access points
(unless these APs are VERY far apart), but you are much more susceptible
to interference from a neighbor's no-name-brand cordless phone on the
2.4Ghz band or their microwave than you are from your own Bluetooth
device.=20

The #1 point of interference is actually other 802.11x wireless networks
and equipment, not bluetooth devices.=20

The main problem is actually wifi interference on Bluetooth function,
not the opposite. This is precisely why Adaptive Frequency Hopping (AFH)
was implemented. AFH allows the bluetooth device to selectively remove
frequencies which have interference on them (i.e. those where an active
wireless network is using that frequency). Most, if not all, Bluetooth
1.2 devices are using AFH.=20

The problem is coming up again though, because of physical distance from
the bluetooth and the wireless device. With devices using wifi AND
bluetooth in the same physical device at the same time (VoWLAN
devices).=20

This might provide more insight:=20

http://www.edn.com/contents/images/629312.pdf



--=20
David A. Desrosiers
desrod gnu-designs com
http://gnu-designs.com

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