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.

non os measurement
non os measurement
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
Reply
 
Thread Tools Search this Thread
Old 12th September 2006, 11:31 PM   #1
Bernhard is offline Bernhard  Germany
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Default non os measurement

This is about a partially filtered non os DAC.

First, music signal from an oversampling CD player, 31 kHz analyzer bandwith.
It can be seen the CD bandwith limitation of 22,5 kHz.

non os measurement


Now the transformer + cap filtered non os DAC.
The empty space above 22,5 kHz is filled with harmonics.
Non os gives back a little of what the CD format has taken away.

non os measurement


Pink noise from CD with oversampling, 83 kHz analyzer bandwith.

non os measurement


Pink noise from CD with non os DAC.
It can be seen, at 80 kHz HF is pretty much down.
That should not be a problem for a good amplifier.

non os measurement
  Reply With Quote
Old 13th September 2006, 12:50 AM   #2
Bernhard is offline Bernhard  Germany
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
1 kHz full scale sine non os.
There is the rest of the HF visible.

non os measurement


FFT of the sine, analyzer bandwith 10 kHz, 94dB vertical scale.
The k2 harmonic is caused by the passive I/V.

non os measurement


Same with 100 kHz analyzer bandwith, the 44,1kHz and 88,2 kHz are split, jitter

non os measurement
  Reply With Quote
Old 13th September 2006, 06:24 AM   #3
Werner is offline Werner  Europe
diyAudio Member
 
Join Date: Jan 2002
Location: Belgium
Quote:
Originally posted by Bernhard
The empty space above 22,5 kHz is filled with harmonics.
Non os gives back a little of what the CD format has taken away.
These aren't harmonics, and thus these aren't what 'the CD format has taken away'.


Quote:
Originally posted by Bernhard
Same with 100 kHz analyzer bandwith, the 44,1kHz and 88,2 kHz are split, jitter

Baseband frequency f creates images at every N*fs+f and N*Fs-f,
so 1kHz has images at
44.1kHz-1kHz
44.1kHz+1kHz
88.2kHz-1kHz
88.2kHz+1kHz
...
  Reply With Quote
Old 13th September 2006, 09:12 PM   #4
Bernhard is offline Bernhard  Germany
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Quote:
Originally posted by Werner

Baseband frequency f creates images at every N*fs+f and N*Fs-f,
so 1kHz has images at
44.1kHz-1kHz
44.1kHz+1kHz
88.2kHz-1kHz
88.2kHz+1kHz
...
Thanks

Still, there is something above 22 kHz and maybe it makes a difference. Perhaps.
  Reply to this post

Reply


non os measurementHide 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
PC Dac Measurement supra Digital Line Level 1 14th July 2009 12:54 PM
hum measurement Gluca Tubes / Valves 10 18th May 2005 10:26 AM
how to take db measurement sonu Multi-Way 7 9th May 2005 03:03 PM
New measurement mic in UK pinkmouse Multi-Way 4 10th February 2005 05:46 AM


New To Site? Need Help?

All times are GMT. The time now is 09:00 AM.


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
Wiki