In article , RJH
wrote:
On 23/05/2015 08:21, Brian-Gaff wrote:
Does the sound have any disruptions just as it goes and comes, i.e.
spitting or clicks? I have heard this kind of thing when the signal is
almost out of lock or weak. If so then this points to the cable or
other parts of the optical link. the only other thing that springs to
mind is mains borne interference of some kind. One assumes that the
sound from the TV itself is not now doing the same, assuming the set
allows both its own sound and other devices to function at the same
time.


It's just on/off for a split second - no crackles. Never noticed it on
the TV, so I'd guess there's something going on with the optical
connection/gubbins.

Perhaps a bit of grime in the device's optical 'socket' that's reducing the
power level?

I have had that effect once in the past with something.

However it does look like a flaw in the device.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Yes an opening for Russ Andrews. How about negative refractive index pure
crystal cables

Brian

--
From the Sofa of Brian Gaff Reply address is active
"Don Pearce" wrote in message
...
On Sat, 23 May 2015 11:02:41 +0100, Jim Lesurf
wrote:

In article , RJH
wrote:
Not sure if anyone can give me any pointers to diagnose the following
issue:

I recently bought a Tannoy BaseStation One TV soundbar. While watching a
film, the audio will cut out for maybe half a second every 20 minutes
or so. Possibly relevant detail:

The BaseStation is connected directly to the TV with an optical cable;
The cut in sound never happens in the same place twice; It also happens
when optically connected directly to the Blu-ray player; The BaseStation
has replaced an AV amp, which was also optically linked to the TV, and
had no issues.

Any ideas please?

In the past I've had *occasional* dropouts when the optical 'fibre' was
either fairly lossy and/or made poor connections. Have you tried changing
the optical cable to a different design - perhaps shorter?

Beyond that, may be a fault in the device.

Jim

The idea of needing a shorter optical fibre feels wrong. I use fibres
that run for hundreds of miles with almost no signal loss, and here
are these things that are struggling to go a few feet. I know they are
not much more than bits of plastic - probably a bit like strimmer
cords - but it is still all wrong.

d

On Sat, 23 May 2015 15:57:33 +0100, "Brian-Gaff"
wrote:

Yes an opening for Russ Andrews. How about negative refractive index pure
crystal cables

Brian

Russ Andrews... Has he really not been done in by one of his customers
yet?

d

In article ,
Don Pearce wrote:
The idea of needing a shorter optical fibre feels wrong. I use fibres
that run for hundreds of miles with almost no signal loss, and here
are these things that are struggling to go a few feet. I know they are
not much more than bits of plastic - probably a bit like strimmer
cords - but it is still all wrong.

I thought the same at first encounter.

But in reality the high spec telcom/data fibres are low loss glass probably
single mode. Spliced and connected with precision, and matched. Whereas the
home AV ones are floppy plastic pipes connected in roughly about the right
places. Probably no matching or alignment beyond the order of half a mm.

More than once I've found one optical fibre didn't work when another did.
In some cases the output was visibly dimmer when using lengths of just a
couple of meters.

Alas, as in some other areas, cost and fancy labels may not be a guide.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article , Brian-Gaff
wrote:
Yes an opening for Russ Andrews. How about negative refractive index
pure crystal cables

Oh dear. You do realise that materials with a negative refractive index
*can* be made and used... 8-]

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

On Sat, 23 May 2015 16:26:02 +0100, Jim Lesurf
wrote:

In article ,
Don Pearce wrote:
The idea of needing a shorter optical fibre feels wrong. I use fibres
that run for hundreds of miles with almost no signal loss, and here
are these things that are struggling to go a few feet. I know they are
not much more than bits of plastic - probably a bit like strimmer
cords - but it is still all wrong.

I thought the same at first encounter.

But in reality the high spec telcom/data fibres are low loss glass probably
single mode. Spliced and connected with precision, and matched. Whereas the
home AV ones are floppy plastic pipes connected in roughly about the right
places. Probably no matching or alignment beyond the order of half a mm.

More than once I've found one optical fibre didn't work when another did.
In some cases the output was visibly dimmer when using lengths of just a
couple of meters.

Alas, as in some other areas, cost and fancy labels may not be a guide.

Jim

Precision? You just reminded me. When I was working in India a little
street girl, about seven years old, was hanging round every day,
interested in what we were doing. So I taught her how to splice fibre.
It took her about three goes and she was better at it than any of us.
So she was our fibre girl at 50 dollars a day. We taught her to read
as well. I really hope that money - I think she had about 2,000
dollars by the time the contract was up - gave her a decent start in
life.

d

No he sold them the gun, but they missed.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Don Pearce" wrote in message
...
On Sat, 23 May 2015 15:57:33 +0100, "Brian-Gaff"
wrote:

Yes an opening for Russ Andrews. How about negative refractive index pure
crystal cables

Brian

Russ Andrews... Has he really not been done in by one of his customers
yet?

d

Yes the invisible car syndrome perhaps.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Jim Lesurf" wrote in message
...
In article , Brian-Gaff
wrote:
Yes an opening for Russ Andrews. How about negative refractive index
pure crystal cables

Oh dear. You do realise that materials with a negative refractive index
*can* be made and used... 8-]

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics
http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

No indeed. I had a Sony one and one made by Crown, whoever they are, but
ironically, the Crown one worked but the Sony one was crap. I guess this is
just part of the brand engineering world we live in. I have decided that
optical systems should all be replaced by coax cable where the bandwidth
allows it. Much more robust.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Jim Lesurf" wrote in message
...
In article ,
Don Pearce wrote:
The idea of needing a shorter optical fibre feels wrong. I use fibres
that run for hundreds of miles with almost no signal loss, and here
are these things that are struggling to go a few feet. I know they are
not much more than bits of plastic - probably a bit like strimmer
cords - but it is still all wrong.

I thought the same at first encounter.

But in reality the high spec telcom/data fibres are low loss glass
probably
single mode. Spliced and connected with precision, and matched. Whereas
the
home AV ones are floppy plastic pipes connected in roughly about the right
places. Probably no matching or alignment beyond the order of half a mm.

More than once I've found one optical fibre didn't work when another did.
In some cases the output was visibly dimmer when using lengths of just a
couple of meters.

Alas, as in some other areas, cost and fancy labels may not be a guide.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics
http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article , Brian-Gaff
wrote:
Yes the invisible car syndrome perhaps. Brian

Also for making optical systems with 'super resolution'. i.e. resolve below
the standard level specified in textbooks from the wavelength and F-number.

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html