spdif signal generator - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

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

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 22nd August 2010, 11:26 AM   #1
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
Default spdif signal generator

Dear All,

Just curious: what do you use to test DACs and other digital sources ? Do you have something like an spdif signal generator ? I understand that a PC can be used, but I am wondering if the frequency limitations that the software signal generators have depend on the sound card. Do you think it is possible to generate a 50 kHz signal with the PC using the spdif out, or some interface like the hiface ?

thanks,

Davide
  Reply With Quote
Old 22nd August 2010, 11:49 AM   #2
diyAudio Member
 
kipman725's Avatar
 
Join Date: Jun 2007
Location: London/N.lincs
Send a message via MSN to kipman725
yep as long as the sample rate is set high enough on the PC, IE 192Khz for >48Khz. However why would 50Khz be on interest? you can't hear it.
  Reply With Quote
Old 23rd August 2010, 12:49 AM   #3
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
50 khz was just a number to say "something above the audio range" , I was curious to see what is the pass band of the DAC chip. Any software recommendation ? for MAC would be optimal, but windows is fine as well.

What is difficult then to check with such a setup is the phase of the signal, as I cannot see how I can have a common time base between the input and the output.

D.
  Reply With Quote
Old 23rd August 2010, 03:18 AM   #4
jcx is online now jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
PC soundcard record/capture can have significant latency - single digit ms is considered acceptable, more annoys musicians trying to add/layer tracks

hitting a defined in/out relative phase at 50KHz is simply beyond current technology PC audio - if you need such resolution you need to include markers in your source file and determine phase with respect to them in the recorded output

for most soundcards the skew between channels should be very small and stable, recording analog stimulus signal and tested device output to different soundcard ADC channels is another solution to acquiring precise phase information

I have used Ltspice to create complicated .wav at higher sample rate/resolutions and used Audacity open source sound editor to play/record on a pci soundcard- but haven't tried to determine or make measurements that would rely on the latencey

Last edited by jcx; 23rd August 2010 at 03:48 AM.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Signal generator schematic rinox Parts 5 18th November 2009 10:00 PM
Signal Generator Help Bengali Equipment & Tools 12 24th April 2008 05:20 PM
looking for a signal generator Ahmad_tbp Solid State 21 9th September 2006 12:37 AM
DIY signal generator? Loial Parts 13 19th September 2005 11:36 AM
signal generator help hizz_eye Solid State 2 3rd March 2005 11:25 AM


New To Site? Need Help?

All times are GMT. The time now is 06:54 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2