Log in
Register
Home
Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
News
Members
Current visitors
New profile posts
Search profile posts
Features
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Menu
Install the app
Install
Reply to thread
Home
Forums
Pro Audio
Varsity
Dual Channel FFT
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Mark DeArman" data-source="post: 56149" data-attributes="member: 950"><p>Re: Dual Channel FFT</p><p></p><p></p><p></p><p>Not to get completely off my topic and into synchronization issues. I went looking for any papers published on this and I can't find any. There are a lot of publications on clock jitter effects, long haul digital audio, broadcast audio video sync, etc.. Does anyone know of a study on input-output clock synchronization effects on noise measurements? I would be really interested to know, if you take the computer OS timing issues out of the equation, what the effect on the measurements would be.</p><p></p><p><a href="http://www.aes.org/e-lib/browse.cfm?elib=12347" target="_blank">AES E-Library » Time Delay Spectrometry Processing Using Standard Hardware Platforms</a></p><p></p><p>Pretty recent and talks a little bit about all the issues I would imagine to be a problem. But doesn't have any actual data to show how much effect the problems have.</p><p></p><p></p><p></p><p>Not really sure how SMAART works. In my "theoretical" system it works like this:</p><p></p><p>Microphone->Cable->ADC->Buffer->Low level DMA->ASIO Wrapper->Main Memory.</p><p>While the reference is already in Main Memory.</p><p></p><p>No extra moves required. Pretty sure this is how EASERA works in single channel mode.</p><p></p><p></p><p></p><p>I'm confused. Whether you use a loop-back cable or not if you want to reference your system to something real it should be calibrated. If you're making relative measurements calibration curves from the output to the input are sufficient?</p></blockquote><p></p>
[QUOTE="Mark DeArman, post: 56149, member: 950"] Re: Dual Channel FFT Not to get completely off my topic and into synchronization issues. I went looking for any papers published on this and I can't find any. There are a lot of publications on clock jitter effects, long haul digital audio, broadcast audio video sync, etc.. Does anyone know of a study on input-output clock synchronization effects on noise measurements? I would be really interested to know, if you take the computer OS timing issues out of the equation, what the effect on the measurements would be. [URL="http://www.aes.org/e-lib/browse.cfm?elib=12347"]AES E-Library » Time Delay Spectrometry Processing Using Standard Hardware Platforms[/URL] Pretty recent and talks a little bit about all the issues I would imagine to be a problem. But doesn't have any actual data to show how much effect the problems have. Not really sure how SMAART works. In my "theoretical" system it works like this: Microphone->Cable->ADC->Buffer->Low level DMA->ASIO Wrapper->Main Memory. While the reference is already in Main Memory. No extra moves required. Pretty sure this is how EASERA works in single channel mode. I'm confused. Whether you use a loop-back cable or not if you want to reference your system to something real it should be calibrated. If you're making relative measurements calibration curves from the output to the input are sufficient? [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Pro Audio
Varsity
Dual Channel FFT
Top
Bottom
Sign-up
or
log in
to join the discussion today!