Scaling voltage waveforms for distortion analysis - diyAudio
Go Back   Home > Forums > General Interest > Everything Else
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

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 8th September 2008, 01:31 AM   #1
okapi is offline okapi  United States
diyAudio Member
okapi's Avatar
Join Date: Aug 2004
Location: Buffalo
Default Scaling voltage waveforms for distortion analysis

I am using Igor Pro from Wavemetrics and my sound card to do some basic measurements of amps and speakers.

I would like to implement basic distortion analysis.

I can obtain time aligned output and input voltage waveforms.

I would like to scale the output waveform to the input waveform to obtain the minimum difference and then subtract the one from the other to give a distortion measurement.

My question is, what is/are the method/s for scaling a waveform to minimize the difference?

  Reply With Quote
Old 10th September 2008, 01:58 AM   #2
okapi is offline okapi  United States
diyAudio Member
okapi's Avatar
Join Date: Aug 2004
Location: Buffalo
i think i need to add some info to clarify my question.

the input and output waveforms are frequency sweeps - it would be much easier to find the best fit scaling for a single frequency but i am interested in obtaining
THD measurement in a single sweep across the audible spectrum.

also, how do distortion analyzers handle phase shifts - are phase shifts considered part of distortion or are waveforms phase aligned before distortion analysis?
  Reply With Quote


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
DIY Distortion Analyzer/Analysis? mlloyd1 Equipment & Tools 152 18th November 2016 10:58 PM
Scaling the SLCF for other voltage - help Will Tubes / Valves 5 6th March 2009 04:46 AM
SPICE distortion analysis jgedde Solid State 6 8th February 2008 04:57 PM
Distortion Analysis using an Oscilloscope gingertube Tubes / Valves 5 14th November 2007 04:14 PM
Distortion analysis mu follower docali Tubes / Valves 12 7th April 2005 06:54 AM

New To Site? Need Help?

All times are GMT. The time now is 08:26 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2