On Thu, 11 Nov 2004 21:53:03 -0000, "Keith G"
wrote:

"Trevor Wilson" wrote in message
...

"Tat Chan" wrote in message
...
Keith G wrote:

A while back I made a reference to a woolly memory of something I had
read in HFW to do with Tim de P's views on bitrates and their vinyl
equivalents and said I would post a reference to it, if it ever
appeared. Well it's popped up out of the blue and is, of course, nothing
like I remembered it.

It's on 2 pages of the April 2004 edition:

http://www.apah69.dsl.pipex.com/keit.../article01.jpg

plus the top left paragraph he

http://www.apah69.dsl.pipex.com/keit.../article02.jpg


The 'bitrates' are nothing to do with vinyl it seems - simply Tim De
P's idea of a minimum requirements for digital to come even close.


so Tim de P reckons that digital should be 24/400, eh?
Most people can't hear above 20kHz, and 400kHz would allow signals with
frequency content of up to 200kHz be reproduced perfectly. A bit of a
waste, isn't it? Though 200kHz would better capture the harmonics of a
square/triangle wave.

**16/44 digital can't even reproduce a decent 5kHz square wave. Such a
feat is a doddle for a good vinyl system. Do you think you can hear the
difference between a 5kHz square wave and a 5kHz sine wave? Hint: You
probably can.


24-bit resolution would imply a dynamic range of 144dB. That's pretty
loud!


Now, having said all this, I still have another memory that there are
some pretty impressive figures somewhere that compare vinyl 'information
flow' very favourably with digital bitrates, but I've no idea where from
and have no intention of trying to find out. - I don't need to,


Vinyl only has (at best) 70 - 78 dB of dynamic range, which equates to
12 - 13 bits resolution, and I am sure vinyl is bandwidth limited as well
(cuts off at 16kHz?).

**Nope. In fact, a good vinyl recording can go well past 50kHz. The mighty
Dynavector 10D-II can operate to 60kHz. The square wave performance of
this very fine cartridge is exemplary.


Isn't the extra "frequency content" associated with vinyl a byproduct of
the mechanical replay system?

**In poor systems, yes. In good systems, no.

In *any* system, definitely yes, since even the mighty Rockport Sirius
III with an Insider cartridge, will still be playing the same tired
old vinyl, which has nothing but noise above 20kHz, despite Trevor's
bull**** claims.

OK Mr Wilson, that was rather neatly done - I have to admit that....

Neat perhaps, utter ********, definitely.
--

Stewart Pinkerton | Music is Art - Audio is Engineering