My experiences with perfect digital transfers were originally with a Sonic
Solutions edit workstation, a Tascam DA20 DAT recorder and a very old Kenwood CD
player. I have done a lot of editing with this setup, including merging the same
piece of audio after splitting it manually, sample accurately. I never noticed
any change in sample values, and if I did, It was because it really wasn't the
same spot.

For your conveniance (and because of the name of this group, and because it is
interesting), I just did another experiment, using
-Computer with ZoltrixNightingale and home-brew coaxial input
-Sony 59ES DAT-recorder
-Denon DCD-635 CD-player.
-Cool Edit Pro software

First, I made two copies of a DAT-tape with lute music.
Loaded these in Cool Edit Pro
Searched the same spot by a distinct lute note, and trimmed the beginning of
both recordings on the highest sample of this note.
Then I copied the left channel of recording 1 over the right channel of
recording 2.
Now my screen looked more or less like yours, but without the differences
between the channels!
With the 'channel mixer', I subtracted the channels from each other, and only
perfect silence remained. Zero samples only!

Next, I did the same experiment with a CD, using the DAT recorder as
optical-coaxial converter.
Same result, exept for a regular pattern of noise pulses, coming from a scratch
on the CD. Between these pulses, again absolute zero!


Looking at your screenshot, I would say that there must have been a kind of
re-sampling and-or redithering.
Maybe because of AC3 logic (dsp!) in the LD player?

Regards,
Michel.










----- Original Message -----
From: "sfdsdgdsg" <de_haro@...>
To: <cmi833X@yahoogroups.com>
Sent: Thursday, November 06, 2003 9:13 PM
Subject: [cmi833X] Re: Perfect digital transfer, it's possible?


> Thank you for your answers, and excuse me for my bad english.
>
> This is what I have:
>
> -LD player (Pioneer CLD-D925), with Toslink optical output.
>
> -Sound card Terratec Aureon 5.1 Sky, with Toslink optical input.
>
> And this is what I want to do:
>
> I would like to transfer the digital sound track of some movies on
> LD to my Hard Disk, with any loss of quality, this mean perfect
> transaction bit to bit.
>
> The sound on LD is digital PCM (the same system on CD audio).
>
> I'm sure that I'm transfering the digital track because the digital
> output on the LD player only can out the digital track. The movie
> also have a analog audio track, but this track can not be out to the
> digital output, only to the analog one.
>
> I'm sure that the digital transaction is far to be perfect because I
> do two consecutive transfers of the same sound, later I compare the
> two samples and the waveform is diferent.
>
> Of course, I strip the zero samples and start comparing from the
> first real audiosample.
>
> Take a look here and you will see what I mean:
>
> http://personales.ya.com/deharo/digitalsoundtest.JPG
>
> I have try to use a portable computer with digital output instead
> the LD player, and I have the same results.
>
> Michel, you say you have done perfect transactions, how have you
> verified that? What hardware have you used? Please, tell me what
> source (CD player, LD, minidisc), what sound card (manufacturer and
> model) and what kind of conections, optical or coaxial. Your
> information is very important for me.
>
> Thank you
>
>
>
>
> --
>
> cmi833x list archive, files, settings and unsubscribe
> - http://groups.yahoo.com/group/cmi833X
>
> Xenomorph
> - http://xenomorph.net
> Tom Browne's site
> - http://www.tbrowne.demon.co.uk
> Duncan Martin's site (incl. SAQ!)
> - http://www.codebunny.org
> Cmedia
> - http://www.cmedia.com.tw
>
>
>
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>