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Strange bluetooth artefacts in audio connection

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  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

#33467 — Strange bluetooth artefacts in audio connection

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.


-- 
Chris Green
·

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#33578

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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#33585

Frank Slootweg <this@ddress.is.invalid> wrote:
> 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.

Yes, thanks.  It actually seems to be down to some specific
interaction between one particular Bluetooth 'receiver' and the
amplifier I'm using.

So, say the first Bluetooth receiver I tried is called BTA and a new
one I just bought is called BTB.

BTA works with most amplifiers but produces the above syptoms with a
Sony midi system.  BTB works with all systems including the Sony. 

It could be (as you suggest) some wireless interaction.  However as I
now have a compination that works I'm not going to fuss too much! :-)

-- 
Chris Green
·

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