[EMAIL PROTECTED] wrote:
>
> Ralphie explained jitter:
>
> > So lets play them back. But with some jitter introduced
> > of -0.1 +0.1 +0.1 -0.1.
> > Thus,
>
> This is a useful exposition, but in practice, what you may get is:
>
> 1 @ -0.0001
> -1 @ 1.0001
> 1 @ 2.00001
> -1 @ 2.99999
>
> the question is, does this make any difference ? These jitters are measured
> in picoseconds. There are 22 675 737 picoseconds between samples at 44.1
> kHz.
Sorry simon, but there are 2 S/PDIF frames of 32 bits in each sample.... Ie,
22 675 737 / 64 = 354.3 ns per sample...
Hmm, I agree, 1 ps of jitter is probably un-noticable.
> > I think you agree that this series of bits represents
> > another waveform.
>
> In the digital domain, it is easy to measure the jitter with suitable
> equipment. Is there ANYTHING (other than a golden ear) that can measure a
> difference in the analog output from the D/A as a result of this jitter,
> even if it isn't reclocked ?
I'll try see if I can come up with two FFTs to compare.... It'll take me
some time, probalby the time of my boss.... Hmmm... Maybee that's not a
very bright idea....
Cheers,
Ralph -> Trying to spend less time on md-l and more on ST....
--
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Ralph Smeets Functional Verification Centre Of Competence - CMG
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