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WTL - Here's an old thread where a computer programmer friend of mine thought he grasped how a CD was not strictly digital:
http://forum.stereophile.com/forum/showf...amp;Search=true
http://www.emedialive.com/Articles/ReadArticle.aspx?CategoryID=42&ArticleID=13076
http://hometheater.about.com/gi/dynamic/...orks.com/cd.htm
Thanks Jeff. I remember reading that thread before. I guess the idea here is that it's said to be not entirely digital, even if it goes from an analog signal through a ADC to be digital and back through a DAC to be analog. What does that say about analog, e.g. LPs?
Digital information is transmitted using analog methods.
An analog signal has a base frequency and its variations of caused by timing errors.
It also has amplitude and it is not always an exact level of a high or low.
Digital specs thus have tolerances to account for variations in the timing and level of the analog signal that contains the digital data.
Reference Bruno Putzeys 2006 AES paper "All Amplifiers Are Analogue But Some Amplifiers Are More Amalogue Than Others".
These are analog properties.
Excellent summary!