In article ,
Keith G wrote:
"Mr.T" MrT@home wrote in message
...
See the works of Shannon, and the last 25 years of actual test
measurements.
No, I said *where's* you proof, not *what* is your proof....
Keith, the best "where" to go would be for you to begin with Shannon's
work. A good example last time I looked was at
http://cm.bell-labs.com/cm/ms/what/s...day/paper.html
You would need to read his paper and understand it. (If that page has been
moved, you can probably find other copies of his papers elsewhere on the
web as it is quite an important bit of work. Forms one of the basics of
information theory and engineering.)
Alternatively, a summary introduction to the relevant part of his work is
covered in part 8 of the 'Information and Measurement' section of the
'Scots Guide'.
Once you have understood the work Shannon and others did you will then be
able to follow what the actual evidence in terms of quantifying amounts of
'information' means for various real-world systems, and then how different
systems compare on that basis.
if you apply this, then it can be shown fairly easily that even with very
careful manufacture and use, the vinyl LP system doesn't deliver an
information channel capacity that reaches that of a correctly made and used
CDA. Thus claims that it inherently has a higher information capacity than
CDA are simply incorrect. This has nothing to do with what you or I may
prefer to listen to.
Indeed, a rough assessment of this is an example I often use as a test
question for undergrads. Once you understand the relevant theory, the
evidence is quite clear, and has been so for some decades - even using
optimum values for test pressings. Examples of the relevant information
have appeared in the professional journals. Some of these are listed at as
references in the 'Good Resolutions' article on the audiomisc site.
TBH The main complication in assessing this accurately is that the
nonlinearies of LP as an information channel, along with all sorts of
factors like the max level and noise level varying with frequency and
distance from the center of rotation make it hard to take everything into
account. Thus most analysis omits these and assumes that the LP is better
(in terms of information channel capacity) than in reality will be the
case.
Slainte,
Jim
--
Electronics
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Audio Misc
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http://www.audiomisc.co.uk/Armstrong/armstrong.html