Timing is everything - pburant

Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

Timing is everything

Posted by pburant (A) on October 20, 2004 at 13:33:50

In Reply to: Re: Yep, and.... posted by Heidi2000 on October 20, 2004 at 13:06:46:

With the MS Windows bits, your compouter can retry time after time to read all the bits until it reads them all. It must get them all in the right order, but this is all independent of time. With a CDP, it can't retry forever, since it's working in real time. Yes, there is oversampling, but in order to continue to reproduce music without interruption, the player must eventually make a decision. Probably a bigger factor than this, however, is that when a CDP does have to sturggle to read a bit properly, this wreaks havoc on the power supply, which can degrade the performance of the DAC, or in the case of a transport only, introduce jitter into the bitstream output.

If you visit Jon Risch's web site (there is a link to it in the Asylum FAQs), he goes into much more detail than this. Even though it may be more detail than you want, I'd still recommend it to make sure I haven't passed any of it on incorrectly. The short of it, though, is that the more perfectly the bits are laid down on the disc, the easier it is for your player to properly turn it into music, as the side effects of slobby bits are degraded sound quality.

The bit position on a disc can only be altered via imperfections in the burning process (remember - all things mechanical have tolerances). Moving a bit in any other way would really be changing it from a one to a zero, or vice-versa and therefore altering the content, not just the precision of the digital copy of the content.

As for why you didn't see any differences in the VCD copy, were you using the same player? Even if you were, the video reproduction circuitry may not be as susceptible to jitter as the audio section. There's also the issue of whether or not your eyes are as sensitive to a certain level of jitter on a particular screen as your ears are thru a particular system. If you were to take your original and CDR audio CDs and play tem on a different system, it's possible that you may not hear as much, or any, difference.

-Pete

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Follow Ups Full Thread

Topic - CDRs vs Regular CDs - Heidi2000 11:55:03 10/20/04 (14)

Re: CDRs vs Regular CDs - nutella 19:58:54 10/22/04 (0)

Re: CDRs vs Regular CDs - Todd Krieger 21:41:22 10/21/04 (0)

Re: CDRs vs Regular CDs - Awe-d-o-file 07:17:31 10/21/04 (0)

Thanks all for your contribution. One last observation regarding store bought CDs - Heidi2000 05:37:45 10/21/04 (0)

Just as mystifyingly..... - max-greece 02:40:38 10/21/04 (0)

totally different recording process )) Re: CDRs vs Regular CDs - ruffscruff 22:11:50 10/20/04 (0)

Different types of CDR's will be better than others! - NEAR SOTA 21:36:56 10/20/04 (0)

Yep, and.... - pburant 12:37:11 10/20/04 (6)

Re: Yep, and.... - JarrettH 00:36:01 10/21/04 (0)

Re: Yep, and.... - Heidi2000 13:06:46 10/20/04 (4)

Re: Yep, and.... - PhilNYC 05:46:55 10/21/04 (0)

Also, with computers, there is NO error correction....(nt) - Android 14:07:15 10/20/04 (1)

Where do you get that notion from?? .....(nt) - clifff 03:13:49 10/22/04 (0)

Timing is everything - pburant 10/20/0413:33:50 10/20/04 (0)

Follow Ups

Timing is everything - pburant 10/20/0413:33:50 10/20/04 (0)

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