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Codifus wrote:

Nousaine wrote:

(TChelvam) wrote:

Steven Sullivan wrote in message
news:gBMzc.40266$eu.31721@attbi_s02...

What's to prevent someone from claiming, 'you haven't measured the *right

thing*'?

Along with the ever-popular 'not everything can be measured'?

Like what they said in 1994 or 1993 issue of The Absolute Sound.
It goes something like this " ...the engineers must be laughing when
one magazine claimed that they managed to do meaningful jitter
measurement.".

I guess they must be laughing now at their ignorance, then.

Probably, prior to 1985, we do not know what a jitter was.

Actually jitter was a known and solved problem in telecommunications 20
years
prior to that. The American public first used digital audio as early as
1962
when Westren Electric installed the first digital carrier systems in the
long
distance network in Illinois.

As a former Bell Labs scientist explained to me about 1986; jitter can be
a
performance issue when you have a call that is placed from New Jersey and
finally connected in Los Angeles after several alternate possible
route-ings
and multiple analog to digital and reverse conversions but it isn't an
issue
between your cd player and dac inboard or otherwise.

But then, that would depend on the quality of the measurment. In phone
conversation, we aren't looking for audiophile quality, so any jitter
they find on the phone must be extreme. The jitter in audio is probably
high enough to be bothersome to those "golden ears" but more than
acceptable to phone conversations.

CD

Even if that were to be true the original claim was

Probably, prior to 1985, we do not know what a jitter was.

Which is patently untrue. Also note that Mr Pierce made reference to a bbc
paper published in 1974.