|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
|
|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
In Reply to: Re: RE Error Rates and Jitter posted by Charlie G on January 1, 2002 at 20:58:23:
Well, I'd love to see some measurements/proof to back this up:
"Jitter read from a CD will affect how well the read servo
stays locked, and how much the read servo has irregular power
supply demands." (from the website)How exactly does the exact timing of the pits of a single bit effect the positioning of the servo? As long as the bits are coming off the disc correctly, at least well enough that the transport is not interpolating, I can see no reason this would cause the servo to reposition itself or otherwise cause a voltage transient due to that. I'm not saying it COULDN'T be happening, or perhaps I'm just reading that statement the wrong way, but where is the proof of this?
Well if he's referring to the tracking servo, i.e. the servo motor that keeps the laser centered on the pits, then I think this claim is rather off the mark.
The tracking error signal is generated based on the lateral symmetry/asymmetry of intensity of two tracking beams which is derived from the difference of two pairs of sums from the four laser detection diodes, i.e. (D1 + D2) - (D3 + D4). So even if the "timing" from one pit to another is off the mark (i.e. as the result of "jitter" in the medium itself), lateral symmetry/asymmetry of the two beams would not be effected.
se
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: RE Error Rates and Jitter - Steve Eddy 23:34:59 01/01/02 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
