I_L
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- 27.03.2003
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Ser at 6moons linker til rapporten, har sendt følgende mail:
Ift drivverk og transmisjon har klokke og PLL i DAC omtrent tusen ganger mer å si for endelig ytelse mtp. samplingsjitter. Og det å komme under Dunns hørbarhetsterskel som ofte blir gjengitt og referert til, er ikke spesielt vanskelig. Og koster ikke mye penger.Dear Srajan,
I have been made aware that an excerpt from a document of mine is reprinted in a 6moons review written by you:
http://www.6moons.com/audioreviews/esoteric2/g25u_3.html
Normally I would just see it as a compliment to have my writings republished and thus acknowledged by a hifi magazine such as yours, however in this case one of the reprinted statements is erroneous.
The statement of concern is the following: "CD discs even have physical jitter, often referred to as landscape-jitter and pit-jitter. All these are secondary distortion sources; they can lead to sampling jitter, which will again lead to distortion."
This statement is factually wrong, as there is no link between a CD's physical landscape-/pit-jitter and clock-jitter whatsoever. These are two terms descibing completely different effects; the landscape- and pit-jitter on a CD only affects its yield, it has no relation to sampling jitter as the (sampling) clock is not something that is stored on the disc, but rather a signal generated during conversion. Thus, the above sentence should probably be removed from the site.
The document, that you also link to, was written as a report in a PhD-course and it contants a few errors like this one, since it was never peer-reviewed or intended to be a scientific publication. You should probably note this when linking to the document. If you want to, you are also free to provide a link to my final thesis found here.
Thanks and regards,
Ivar Løkken.