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In Reply to: RE: DSD DAC with no DAC Chip: What are my choices? posted by Thorsten on August 09, 2014 at 22:40:44
"Common DAC structures"? I thought that the dCS Ring DAC is unique and patented. Mind you , I know nothing about DAC structures and and, like not possessing knowledge of the life cycle of the earwig, I am happy to remain that way. But interested in your comment.
Edits: 08/10/14 08/11/14Follow Ups:
There may be specific patents on the Ring DAC, but the basic technology has been around for some time and goes by the name "Dynamic Element Mapping". You will find this in chips such as the ESS SABRE chip, and ESS holds some patents on their specific dynamic element mapping method.
The basic idea behind dynamic element mapping is to spread the conversion process around randomly. This has no effect if all the individual DAC switching elements are identical, but if they have slight differences then these will show up as noise, rather than signal dependent distortion without the dynamic element mapping. Since noise that is uncorrelated with the music is much less obtrusive than distortion this is a net gain.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
nt
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