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

Equipment & Tools From test equipment to hand tools

Waveform analysis
Waveform analysis
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 23rd March 2008, 01:11 AM   #1
Conrad Hoffman is offline Conrad Hoffman  United States
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
Default Waveform analysis

I need to analyze some varying periodic signals and can easily record a wav file. Is there any freeware or easy technique to locate zero crossing points (or peaks) and get the time data into Excel? I need the rate of change of the frequency/period. I could probably write a program to do this, but don't want to reinvent the wheel if I don't have to.
I may be barking up the wrong tree, but at least I'm barking!
  Reply With Quote
Old 23rd March 2008, 03:53 AM   #2
jcx is offline jcx  United States
diyAudio Member
Join Date: Feb 2003
Location: ..
Linear's free LtSpice/SwCad III imports .wav, then all of their waveform analysis options are available, look at the .MEAS doc in the help file, also examples on the LtSpice Yahoo group

for a small # of crossings .Meas with cross=1, cross=2 ... could get the intervals

you could even "build" a FM demodulator in sim if you needed to using PLL, Slope filter, or PWM demodulation

another free option is the MathCad workalike SciLab, also with .wav import and all of the number crunching power you could want (well actually a little limited by the 50Meg "stacksize" so audio processing/editing is probably out of the question)
  Reply With Quote


Waveform analysisHide 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
Triangular waveform dead rat Class D 27 11th November 2008 06:54 PM
What waveform to use for testing? __BriKs__ Class D 0 10th December 2006 07:00 PM
Funny waveform! ifrythings Power Supplies 19 1st April 2006 12:49 AM
help with zen waveform jcayer Pass Labs 17 23rd February 2005 04:10 AM

New To Site? Need Help?

All times are GMT. The time now is 01:38 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio