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uk.tech.digital-tv (Digital TV - General) (uk.tech.digital-tv) Discussion of all matters technical in origin related to the reception of digital television transmissions, be they via satellite, terrestrial or cable. Advertising is forbidden, with no exceptions.

HDMI cable



 
 
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  #21  
Old August 29th 17, 03:34 PM posted to uk.tech.digital-tv
R. Mark Clayton[_2_]
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Posts: 476
Default HDMI cable

On Tuesday, 29 August 2017 13:53:21 UTC+1, Mark wrote:
On Tue, 29 Aug 2017 02:45:18 -0700 (PDT), "R. Mark Clayton"
wrote:

On Tuesday, 29 August 2017 08:13:27 UTC+1, Woody wrote:
"pamela" wrote in message
...
On 12:55 23 Aug 2017, lewhiggins wrote:

On 22/08/2017 16:57, Jim Lesurf wrote:

For most purposes it doesn't matter, but not all HDMI cables
are the same and it may affect you depending on your setup.
For an explanation of the various versions see:

https://en.wikipedia.org/wiki/HDMI

Which tends to lead (pun alert!) on to the practical problem of
HDMI cables which aren't fully described at the point of sale,
etc. Leaving the potential buyer to guess. Its a bungle out
there...

Yes indeed. Buyers need to be wary of the assertion that,
because they're digital they're all the same.

On the other hand, there's no need to buy this sort of thing....

http://www.russandrews.com/kimber-hd...e-27299997979/

"And the result of this precise manufacture? Stunning images and
crystal-clear sound. We've seen clear improvements in image
quality, with less noise and finer colour detail; sound was
also more detailed and has better three-dimensional resolution."



He never gives up, does he? At least it gives we readers something to
smile about!


I once bought a hi-fi mag that had a mains cable comparison - what a laugh! Similar piffle about silver speaker cables etc. You want them chunky (high current), but that is about it.

The difference with digital is it either gets there or it doesn't.


Unless it's marginal and some bits are received incorrectly.


In which case they are either corrected or they can't be, but in principle the signal either gets there or it doesn't.

For video, you can take a few dropped packets, but not for real data.


My broadband comes over several hundred metres of very thin, corroded aluminium wire unshielded from neighbouring wires, through rats' nests of connections in wet and / or underground boxes and still manages to deliver a thousand times more bandwidth than a CD virtually without error (and those are corrected).


And could deliver more bandwidth if it wasn't a piece of wet string.


Indeed - Virgin will give you 200Mhz down coax.
  #22  
Old August 29th 17, 03:37 PM posted to uk.tech.digital-tv
Mark[_6_]
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Posts: 91
Default HDMI cable

On Tue, 29 Aug 2017 08:34:39 -0700 (PDT), "R. Mark Clayton"
wrote:

On Tuesday, 29 August 2017 13:53:21 UTC+1, Mark wrote:
On Tue, 29 Aug 2017 02:45:18 -0700 (PDT), "R. Mark Clayton"
wrote:

On Tuesday, 29 August 2017 08:13:27 UTC+1, Woody wrote:
"pamela" wrote in message
...
On 12:55 23 Aug 2017, lewhiggins wrote:

On 22/08/2017 16:57, Jim Lesurf wrote:

For most purposes it doesn't matter, but not all HDMI cables
are the same and it may affect you depending on your setup.
For an explanation of the various versions see:

https://en.wikipedia.org/wiki/HDMI

Which tends to lead (pun alert!) on to the practical problem of
HDMI cables which aren't fully described at the point of sale,
etc. Leaving the potential buyer to guess. Its a bungle out
there...

Yes indeed. Buyers need to be wary of the assertion that,
because they're digital they're all the same.

On the other hand, there's no need to buy this sort of thing....

http://www.russandrews.com/kimber-hd...e-27299997979/

"And the result of this precise manufacture? Stunning images and
crystal-clear sound. We've seen clear improvements in image
quality, with less noise and finer colour detail; sound was
also more detailed and has better three-dimensional resolution."



He never gives up, does he? At least it gives we readers something to
smile about!


I once bought a hi-fi mag that had a mains cable comparison - what a laugh! Similar piffle about silver speaker cables etc. You want them chunky (high current), but that is about it.

The difference with digital is it either gets there or it doesn't.


Unless it's marginal and some bits are received incorrectly.


In which case they are either corrected or they can't be, but in principle the signal either gets there or it doesn't.


If they can't be corrected then people are likely to notice.

For video, you can take a few dropped packets, but not for real data.


Again, for video, people are likely to notice dropped packets.


  #23  
Old August 29th 17, 08:01 PM posted to uk.tech.digital-tv
Richard Tobin
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Posts: 1,374
Default HDMI cable

In article ,
R. Mark Clayton wrote:

The difference with digital is it either gets there or it doesn't.


Unless it's marginal and some bits are received incorrectly.


In which case they are either corrected or they can't be, but in
principle the signal either gets there or it doesn't.


As I've mentioned before, cables can have problems that are not so
easily classified. I have two HDMI cables which didn't work reliably
for audio return. In one case the sound would drop out for couple of
seconds every 30 minutes or so, in the other the same happened when I
changed the volume. A cheap Amazon Basics cable solved the problem.

[It's not certain that the cables are faulty - perhaps the TV or
receiver needs a better-than-spec cable.]

And of course some cables are susceptible to this sort of problem:

http://www.cogsci.ed.ac.uk/~richard/hdmi.jpg

-- Richard
  #24  
Old August 29th 17, 09:55 PM posted to uk.tech.digital-tv
lewhiggins
external usenet poster
 
Posts: 13
Default HDMI cable

On 29/08/2017 16:34, R. Mark Clayton wrote:

In which case they are either corrected or they can't be, but in principle the signal either gets there or it doesn't.


"Burbling" is a known problem with DAB radios which have a problem
receiving a signal. It's not always all or nothing. See for example:

http://support-uk.pure.com/en/kb/art...er-dab-station

--
Lew
  #25  
Old August 29th 17, 10:15 PM posted to uk.tech.digital-tv
Andy Burns[_12_]
external usenet poster
 
Posts: 346
Default HDMI cable

R. Mark Clayton wrote:

My broadband comes over several hundred metres of very thin, corroded
aluminium wire unshielded from neighbouring wires, through rats'
nests of connections in wet and / or underground boxes and still
manages to deliver a thousand times more bandwidth than a CD

Russ is missing a trick, surely a fully shielded NTE5 with solid silver
xDSL faceplate and Japanese ring capacitor would make spotify sound
richer and youtube look brighter?

  #26  
Old August 30th 17, 07:11 AM posted to uk.tech.digital-tv
Woody[_5_]
external usenet poster
 
Posts: 1,723
Default HDMI cable


"Richard Tobin" wrote in message
news
In article ,
R. Mark Clayton wrote:

The difference with digital is it either gets there or it
doesn't.


Unless it's marginal and some bits are received incorrectly.


In which case they are either corrected or they can't be, but in
principle the signal either gets there or it doesn't.


As I've mentioned before, cables can have problems that are not so
easily classified. I have two HDMI cables which didn't work
reliably
for audio return. In one case the sound would drop out for couple
of
seconds every 30 minutes or so, in the other the same happened when
I
changed the volume. A cheap Amazon Basics cable solved the problem.

[It's not certain that the cables are faulty - perhaps the TV or
receiver needs a better-than-spec cable.]

And of course some cables are susceptible to this sort of problem:

http://www.cogsci.ed.ac.uk/~richard/hdmi.jpg


You have to remember that HDMI is an entirely digital carrier so a
cheap cable with poor coupling isolation will result in crosstalk
and/or higher capacitance which results in waveform shaping both of
which may make decoding difficult for the receiving end. The
description above (as I read it) of poor operation in one direction
seems to indicate poor receive decoding at one end (or low drive from
the transmitting end.)



 




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