Optical audio connections
 

In article , Phil Allison
scribeth thus

"tony sayer" = the Tosser's Arselicker


** Then go Sayer that one

you CONTEXT SHIFTING, ****ING ARSEWIPE !!!



...... Phil




A complement indeed;).....

Must've touched a nerve somewhere;)

Thats if they have a nervous system down there;!..
--
Tony Sayer

Optical audio connections
 

In article , Phil Allison
scribeth thus

"tony sayer" = congenital ****wit


** Cannot be explained without diagrams and math.

Stop avoiding the question...


** Go do your own ****ing test - arsehole.

I have ..


** You have no idea what is even being talked about.

You ****ing, anencephalic pommy pig.



...... Phil




Spouted from the arse of a dingo;)..




--
Tony Sayer

Optical audio connections
 

In article , Phil Allison
scribeth thus

"Jim Lesurf"


FWIW I assumed the "symmetry" PA was referring to is the physical symmetry
that co-ax has as a coaxial circular arrangement.


** Yep - co-axial cable has a symmetry other cables do not have.


This means that the internal (fundamental) TEM(00) mode conveyed has it
E-field vectors radially symmetric about the center of the cable, and
circumferential H-field vectors also symmetric (rotational symmetry about
axis of cable). To 1st order this would tend to reject external fields as
their effect tends to cancel on when you sum the coupling to the TEM mode
inside the waveguide (co-ax). However this makes assumptions about the
coupling field as well as the ideal symmetry of the cable. So field
profiles not uniform across the guide space would not be perfectly
rejected
in general by symmetry.


** It may not be *perfect* in extreme cases ( like with the cable wrapped
around an AC supply transformer) but it is at least as good ( at hum
rejection) as twisted pair cables in the same circumstances.

To know that one simply MUST try it out.

Also try a non twisted pair cable ( figure 8) for reference.


No need for any 'math' to follow the above,


** Nonsense.

The necessary math concepts haves gotta be in your head already - plus so
well entrenched that you instinctively trust them.

Far easier and more convincing to do a comparison test with real cables and
a mic pre amp with headphones.

The you have a very nice demonstration of why balanced mic cable is always
twisted pair - why "star quad" cable exists - bur a real puzzle about
why co-axial cable has been given such bad press as a mic cable.


Yep .. I wonder why the BBC and other pro broadcast outfits don't use it
for audio?..

Let alone PA operators ...
--
Tony Sayer

Optical audio connections
 

In article , Eeyore rabbitsfriendsandrel
scribeth thus


tony sayer wrote:

Phil Allison scribeth thus

The lack of shielding is a disaster for hi-fi audio.

And digital audio IS a data signal.

Anyone specify balanced operation and what level?...

I do believe there's this AES3 / EBU thingy standard.

Graham

Indeed!..
--
Tony Sayer

Optical audio connections
 

"tony sayer" wrote in message
...


I'm not for a moment knocking digital transmission principles its an
excellent thing except where in end delivery they chuck as many bits as
they can get away with .. away;(

What eventually did it for analogue music circuits feeding FM transmitters
was stereo. It proved impossible to match two lengthy music circuits well
enough and hold that matching with changes in temperature etc. Meanwhile
sound-in-sync did away with the need to use them to feed TV transmitters.

Nope .. over very long distances analogue just can't offer the same
quality but still for local it can do very well, of course it needs to
be balanced over twin not a bit of co-ax;)..
--

Agreed, over a few miles balanced circuits over ordinary telephone cable can
do very well indeed. The OP was, of course, talking about the wiring within
his house, so we are talking yards, not miles.

David.

Optical audio connections
 

In article ,
David Looser wrote:
What eventually did it for analogue music circuits feeding FM
transmitters was stereo. It proved impossible to match two lengthy
music circuits well enough and hold that matching with changes in
temperature etc. Meanwhile sound-in-sync did away with the need to use
them to feed TV transmitters.

Big snag with SIS is the fact that you lose the sound with the picture,
and has to be decoded/re-encoded if you wish to do anything to the sound
or picture.

IIRC, it's pretty well restricted to some OB use these days.

--
*When companies ship Styrofoam, what do they pack it in? *

Dave Plowman London SW
To e-mail, change noise into sound.

Optical audio connections
 

In article , David Looser
scribeth thus
"tony sayer" wrote in message
...


I'm not for a moment knocking digital transmission principles its an
excellent thing except where in end delivery they chuck as many bits as
they can get away with .. away;(

What eventually did it for analogue music circuits feeding FM transmitters
was stereo. It proved impossible to match two lengthy music circuits well
enough and hold that matching with changes in temperature etc. Meanwhile
sound-in-sync did away with the need to use them to feed TV transmitters.

And that also take the feeds for the FM Tx\'s from those with NICAM 728
....


--
Tony Sayer