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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?
I might accept that this could change the pattern of voltage transients caused by the amplifier for the laser pickup (and/or the input logic of the chipset), but there is no reason to assume these transients would normaly be precisely in synch with the master clock (or out of synch, or perhaps larger/smaller in magnitude) than during a theoretical 'perfect' series of pits.
I still don't think any good theory (let alone proof of said theory) has ever been put forward as to HOW the CD treatments work.
Charlie G