🚀 go-pugleaf

kclee@hk.gin.net (Chung) writes:

> Could you made sure your CD reader could 100% read the CD without
> error?  If yes (ie.100% correct), why there are so expansive CD
> transport on selling?  If No (have error), than even CDR 100% correct,

A scsi drive, say a Plextor which has a built in hardware (positioning) 
jitter correction could extract data 100% exact each time. The simpliest 
way to verify this is would be to get a programm called feurio from 
http://www.feurio.de/ and start the three different tests available 
there (they are repeated as many times as you want and auto-compare). 

On the other side a data extraction is something different (buffered copy) 
than a real time play (on a CD transport). On the CD transport expensive 
components have to assure that each sample arrives in an exact clock on 
the digital out. A computer drive just reads all the samples and stores 
them, no matter clock and speed -- only requirement is a very accurate 
laser pickup positioning. 

If you try to *play* a CD in the same computer drive it wont sound as 
good as on the transport because of the bad timings (jitter) itroduced 
on its cheap built in DAC. Put the same disc on the transport and you 
will hear a big difference. 


-- 
Bob Velkov
Bob.Velkov@par.univie.ac.at