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Posted by Tom Stiller on 11/10/06 12:32
In article <m3bqnh8glz.fsf@ieee.org>, Randy Yates <yates@ieee.org>
wrote:
> Tom Stiller <tomstiller@comcast.net> writes:
>
> > In article <11s4h.1084$GS2.1008@newssvr14.news.prodigy.com>,
> > "Guest" <llcoolj@comcast.com> wrote:
> >
> >> If you are not used to dealing with high resolution video in it's
> >> purist form and only came aboard recently, then your eye for
> >> spotting resolutions and details may not be as sharp as others. I
> >> have been dealing with high-res video since 1990. I had the
> >> Laserdisc, S-VHS VCR, various DVD players and HD. I know what the
> >> deal is.
> >
> > The issue raised has nothing to do with the quality of high
> > resolution video or the sound quality of audio, but rather can a
> > wire, or fiber, transmitting a bit serial stream compromise the
> > quality of the reconstructed analog signal.
>
> Actually, it can. I'll have to back-peddle a little here.
>
> S/PDIF is a single-wire interface that embeds the clock with the
> data. Because of this, problems with the interface that aren't
> serious enough to cause bit errors can still affect the sound by
> affecting the quality of the recovered clock. A PLL is used to
> recover the clock, and depending on the type of loop filter used in
> the PLL, input noise from cable degradations could introduce jitter
> into the digital clock and thus the reconstructed analog signal.
>
Are you proposing that the clock jitter you describe is sufficient to
shift a bit from one multi-bit sample to another? If so, there would be
more than a subtle effect on the reconstructed analog waveform and you
wouldn't need to be an "expert" to see/hear it.
--
Tom Stiller
PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
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