pfarrell;370564 Wrote:
> ar-t wrote:
> > Listen to a system with lots of jitter, and one with much lower
> jitter.
> > If you can't hear the difference, then I guess is doesn't matter to
> > you.
>
> This is silly. Where am I supposed to find said systems with "lots of"
> or "lower" jitter?
Listen to a decent CD player, that has a SPDIF output. Listen to its
analogue output, and then a typical outboard DAC. That is how.
> If you are on this list, you most likely have a SB3 or Duet or
> Transporter. Any of them particularly terrible? I would expect that TP
> to be fairly good, but what metric is used? For years, I ran the
> output
> of a SB through a Benchmark DAC-1. The Benchmark folks claim that
> their
> DAC is immune to jitter. I suspect that their claim is marketing, but
> how can one tell?
Immune...........well, that is their explanation. They use circuits
that get rid of most of the jitter inherent in the SPDIF chain.
> I've read that the "jitter" measurement that JA uses at Stereophile is
> meaningless, yet he devotes column inches to it each time he gets a
> transport or DAC.
You expect me to defend him? Dream on, bub.
> What metric of jitter is important?
> What devices that we are likely to have are examples, good and bad, of
> this measured thing?
Like THD, it depends on amount and spectral distribution. It can not be
answered in 25 words or less. Especially to skeptics.
> "When you can measure what you are speaking about, and express it in
> numbers, you know something about it; but when you cannot express it
> in
> numbers, your knowledge is of a meager and unsatisfactory kind. It may
> be the beginning of knowledge, but you have scarcely, in your
> thoughts,
> advanced to the stage of science."
> Popular Lectures and Addresses, Lord (William Thompson) Kelvin.
>
> I tried for five years to get a PhD in Software Engineering based on
> measurements of software, preferably measurements of quality or even
> quantity. I failed. There are no measurements of software that mean
> anything. Nothing like power, frequency, pressure, etc. that real
> engineers use to design products.
>
> I hear people talk about jitter, and use "less jitter" to justify huge
> expenditures of hard earned cash. But I've seen zero science or
> engineering to justify what is good and what is bad.
I can measure it. I heard it before I measured it, which is why we set
about to measure it.
> Without some science, I don't believe in jitter, and I don't believe it
> matters.
So, you don't believe in science and already have your mind made up.
Pointless to continue.
Pat
--
ar-t
http://www.analogresearch-technology.net
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