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Re: Strange bluetooth artefacts in audio connection

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Chris Green <cl@isbd.net> wrote:
> I'm trying to use blutooth to stream music from a couple of Android
> devices using VLC for Android as the player.
> 
> I'm getting several strange (and annoying) effects when doing this,
> these are definitely down to the Bluetooth connection as a direct
> wired connection works without showing any of these effects.
> 
> The problems are as follows:-
> 
>     There's a strange sort of 'whoosh' noise at the start and end of
>     each track.
> 
>     If you turn the volume up the sound breaks up completely (turn up
>     at the amplifier that is).  The amplifier *isn't* being overloaded
>     so I really can't understand this effect.  How does turning the
>     volume up at the receiving end affect the sound?  It's not
>     clipping or anything, the sound is overwhelmed by what sounds like
>     a noisy volume control.
> 
>     On one device (Moto E, Android 5.1) the connection drops
>     completely for a few seconds at varying intervals.  Moving the
>     Bluetooth receiver about doesn't seem to make any difference.
> 
> 
> I would emphasise that these problems are *only* when playing via
> Bluetooth, there is no 'whoosh' when directly connected and I can turn
> the volume up to painful levels without significant distortion.  The
> noises occur on both Android devices so it wouldn't seem to be a fault
> on just one of them.

  Do you play from local files (i.e. on the Android device itself) or
from WiFi-connected remote files?

  If the latter, it may be interference between the frequencies used by
WiFi and those used by Bluetooth or/and some problem with the WiFi/
Bluetooth controllers in your device.

  WiFi 802.11b/g/n uses the same 2.4 Ghz bands (2.4 - 2.485 Ghz) as
Bluetooth, so if either end of your WiFi connection is 802.11b/g/n (or
it's configured that way), it may interfere with Bluetooth.

  On my (Windows 8.1) laptop, I had a situation with effects similar to
yours (except for the volume related problem). While I had (only)
802.11b/g/n at the (old(er)) router side, i.e. likely the
first/interference problem, I could solve my problems by using an extra
Bluetooth USB-dongle instead of the internal Bluetooth controller. Of
course that solution is of no help in your case, because - AFAIK - it is
not possible to add such a dongle to an Android device.

  So all-in-all no real help, but perhaps some areas to investigate.

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Thread

Strange bluetooth artefacts in audio connection Chris Green <cl@isbd.net> - 2016-08-17 10:11 +0100
  Re: Strange bluetooth artefacts in audio connection Frank Slootweg <this@ddress.is.invalid> - 2016-08-20 16:04 +0000
    Re: Strange bluetooth artefacts in audio connection Chris Green <cl@isbd.net> - 2016-08-21 10:26 +0100

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