CD's can't have jitter....there is no timing information on a CD...just data samples....in order to get jitter you need some kind of clock or a clock signal.
The is No clock on a CD...
....these audio urban legends go against all logic. The jitter must come downstream of the CD.
So what explains the source of urban legends like thiis? Read on if you care...
Imagine a wobbly surface CD or one where the tracks wobble a lot - this is clealry more difficult to read for a lazer/mechanical system, as the CD rotates the mechanism performs more cyclical corrections per revolution of the disc (in fact the focus corrections will be periodic as each woble repeats on each revolution).
Now the lazer will require more focus adjustments per block of data than a well constructed CD (perfect center and perfect flat surface)....now if you postulate that the rapid oscillations of the focus system for the lazer and the transport mechanism require periodic power and this causes oscillations in the power rails that in turn affect the power to the clock in the D to A......then this may induce jittter in the clock signal.....worse if the jitter is periodic (due to periodicity of the power rail fluctuations) then it will have a much higher chance to be audible than if it where random.
However the problem is the CLOCK timing accuracy! The result may be that one CD perceptively has more jitter than another....but the CD isn't actually the cause. It is the BAD system design that does not properly isolate the lazer tracking mechanism from the clock used to time the D to A.
I hope this helps to explaiin how a CD might "appear" to have more jitter.....what it means is that it may or may not have more jitter depending on the robustness of the CDP player!
Which CD will sound better in a badly designed CDP player? CDR-R? Commercial stamped CD's? The reality is that it will vary....a kind of crap shoot. Genesis found something that worked for them but it may not be the same answer with a different batch of CD-Rs....even from the same manufacturer.
What can you do about it other than playing wiith marker pens and various CD-R manufacturers in an unscientific fashion? ( A hit and miss approach)
A more robust transport, copying either CD to a hard drive and using a computer to play the file back, or a system with an external clock, such as EMM labs use, will generally guarantee that they sound the same. YMMV
The is No clock on a CD...
....these audio urban legends go against all logic. The jitter must come downstream of the CD.
So what explains the source of urban legends like thiis? Read on if you care...
Imagine a wobbly surface CD or one where the tracks wobble a lot - this is clealry more difficult to read for a lazer/mechanical system, as the CD rotates the mechanism performs more cyclical corrections per revolution of the disc (in fact the focus corrections will be periodic as each woble repeats on each revolution).
Now the lazer will require more focus adjustments per block of data than a well constructed CD (perfect center and perfect flat surface)....now if you postulate that the rapid oscillations of the focus system for the lazer and the transport mechanism require periodic power and this causes oscillations in the power rails that in turn affect the power to the clock in the D to A......then this may induce jittter in the clock signal.....worse if the jitter is periodic (due to periodicity of the power rail fluctuations) then it will have a much higher chance to be audible than if it where random.
However the problem is the CLOCK timing accuracy! The result may be that one CD perceptively has more jitter than another....but the CD isn't actually the cause. It is the BAD system design that does not properly isolate the lazer tracking mechanism from the clock used to time the D to A.
I hope this helps to explaiin how a CD might "appear" to have more jitter.....what it means is that it may or may not have more jitter depending on the robustness of the CDP player!
Which CD will sound better in a badly designed CDP player? CDR-R? Commercial stamped CD's? The reality is that it will vary....a kind of crap shoot. Genesis found something that worked for them but it may not be the same answer with a different batch of CD-Rs....even from the same manufacturer.
What can you do about it other than playing wiith marker pens and various CD-R manufacturers in an unscientific fashion? ( A hit and miss approach)
A more robust transport, copying either CD to a hard drive and using a computer to play the file back, or a system with an external clock, such as EMM labs use, will generally guarantee that they sound the same. YMMV