Home Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Digital Drive ]
[ Alert Moderator ]

RE: I have just read this and

fmak,

I believe that the marketing copy refers to a clock recovery technique based around an NCO (numerically controlled oscillator), rather than around the usual analog VCXO. An NCO can track a wider input range than can an VCXO, yet still generate a frequency locked, low jitter local clock. The NCO frequency can be adjusted in very fine steps so to closely match the remote source's clock frequency, enabling a quasi-free running of the NCO.

Because the source clock's long term frequency average must be followed to account for drift, there still can be some jitter transfer if the NCO frequency requires subsequent adjusting, but such jitter would be at very low frequency. So, yes, there still will be some intrinsic jitter stemming from the NCO circuitry itself, and also possibly some very low frequency jitter transferred from the remote source's clock, depending on that remote clock's long term frequency stability. Not exactly zero jitter, but if properly implemented, can perform very well on reducing both intrinsic and transferred jitter.


_
Ken Newton


Edits: 03/16/14
This post is made possible by the generous support of people like you and our sponsors:
  Amplified Parts  

Follow Ups Full Thread
Follow Ups
FAQ

Post a Message!

 Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]