You probably think about oversampling and that is different. Pretty much every CDP contains PLL. It can be used straight just to suppress jitter providing stable clock (by means of averaging) or can be used to create oversampling. Such oversampling is done by comparing in phase detector incoming stream to divided down frequency of higher frequency internal clock. Because this division is integer these oversampling DACs always operate on multiples of incoming frequency while upsampling DACs can work on pretty much any non-integer ratio. Usually PLL is inserted somewhere. Even asynchronous rate converter based DACs (upsampling DACs) like my Benchmark have some form of PLL to make signal stable enough for upsampling. Such PLL is fast responding and single stage while most of CDPs have dual stage PLL that operates at different time constants.
The title is:"There's No Such Thing As Digital..."
Subtitled: "A Conversation With Charles Hansen, Gordon Rankin and Steve Silberman". It's an interesting read if you're not yet familiar with this particular topic...or have only considered it briefly. I wouldn't call myself a digital expert, but I can see no reason to quibble with it one bit:
www.audiostream.com/content/draft
Enjoy.
www.audiostream.com/content/draft
Enjoy.
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- 32 posts total
- 32 posts total