Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Clock Crystal Accuracy
Clock Crystal Accuracy
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 14th February 2020, 11:31 PM   #1
poynton is offline poynton  United Kingdom
diyAudio Member
poynton's Avatar
Join Date: Mar 2005
Location: UK
Default Clock Crystal Accuracy

I know that the frequency of my CD player is 16.9344MHz.

What difference would it make using a clock oscillator with a frequency of 16.9340MHz?

If it ain't broke, break it !! Then fix it again. It's called DIY !
  Reply With Quote
Old 14th February 2020, 11:45 PM   #2
martin clark is offline martin clark  Europe
diyAudio Member
Join Date: Jul 2003
Location: Bath, UK
That's 400ppm low.

Somewhere in the back of my mind I thought Red Book cd recommends +/-200ppm; I might be wrong on that.

Practically, as a clock in a standalone CD player - no issue at all: - it's the close-in LF phase noise ('goodness' of teh clock source) that seems to make a difference. *

that said, if you plan on using he result as a transport to a dac - probably won't matter, but it might depending on how tight/ exactly how that dac is programmed to lock to the datastream.

* musically - 400ppm low average is likely >= 2dec places below what even the finest human sense of pitch can perceive; so no issue at all, muscally

Last edited by martin clark; 14th February 2020 at 11:47 PM.
  Reply With Quote
Old 15th February 2020, 12:07 PM   #3
martin clark is offline martin clark  Europe
diyAudio Member
Join Date: Jul 2003
Location: Bath, UK
Edit - got my maths wrong; that's only 25ppm out. Don't worry about it.
  Reply With Quote
Old 16th February 2020, 09:18 AM   #4
Mike P is offline Mike P  England
diyAudio Member
Join Date: Jan 2012
Location: South Yorkshire
Martin is right (as usual).

What matters for audio (assuming use as a single box player) is 'jitter' of the clock signal. As long as it's within sensible tolerances the absolute frequency of the clock being a tiny amount out doesn't matter, it won't be audible.
  Reply With Quote


Clock Crystal AccuracyHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tube Crystal Clock Oscillator poynton Everything Else 3 25th August 2008 06:32 PM
Clock crystal for NAD c520 CDP dhoffman79 Digital Source 4 7th October 2006 07:24 PM
How to fit a 4 legged Crystal into Kwak Clock ? Will Digital Source 5 20th November 2004 04:40 PM
low ppm crystal clock?m where tone Digital Source 6 27th February 2003 10:23 AM
5.6448mhz clock (crystal) glewis4744 Digital Source 1 16th January 2003 10:18 PM

New To Site? Need Help?

All times are GMT. The time now is 02:31 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio