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

DiAna, a software Distortion Analyzer
DiAna, a software Distortion Analyzer
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 5th December 2017, 11:08 PM   #11
Edmond Stuart is offline Edmond Stuart  Netherlands
diyAudio Member
 
Edmond Stuart's Avatar
 
Join Date: Nov 2003
Location: Amsterdam
Default Hartley transform

Quote:
Originally Posted by davada View Post
Edmond why did you choose the fast Hartley over Fourier?
Hi David,

Good question. Since we are dealing here with real-valued data (thus not complex), an FHT is more elegant and slightly faster than an FFT. For further reading, please see: https://www.embedded.com/design/conn...artley-Smartly

Cheers, E.
__________________
http://www.data-odyssey.nl/
  Reply With Quote
Old 5th December 2017, 11:48 PM   #12
davada is offline davada  Canada
diyAudio Member
 
Join Date: Jul 2004
Location: Fort St John, BC Canada
I have the transform code and I'm familiar with this site.
It's also easier to understand. I like that fact that it is the inverse of itself.
__________________
David.
  Reply With Quote
Old 6th December 2017, 12:09 AM   #13
Edmond Stuart is offline Edmond Stuart  Netherlands
diyAudio Member
 
Edmond Stuart's Avatar
 
Join Date: Nov 2003
Location: Amsterdam
Default FHT vs FFT

And, opposed to an FFT, no ugly hassle to store real date in the space for imaginary stuff. That's what I dislike most about an FFT, totally malformed in order to accommodate only real data.

__________________
http://www.data-odyssey.nl/
  Reply With Quote
Old 6th December 2017, 02:03 AM   #14
bk856er is online now bk856er  United States
diyAudio Member
 
bk856er's Avatar
 
Join Date: Feb 2011
Location: SF Bay Area
DiAna, a software Distortion Analyzer
Quote:
Originally Posted by Edmond Stuart View Post
The file itself can be downloaded at www.data-odyssey.nl/diana/ (not Index of /diana/)
and a few hints to get started can be found at: DiAna
Documentation and help files will come later.

Good luck.

Cheers, E.
Microsoft Security Essentials says the zip contains a virus and automatically deletes the file. This is a first for me. Safe or no?

BK
  Reply With Quote
Old 6th December 2017, 02:39 AM   #15
kannan_s is offline kannan_s  United States
diyAudio Member
 
Join Date: Jun 2009
Send a message via Yahoo to kannan_s
same case for me too?
  Reply With Quote
Old 6th December 2017, 03:15 AM   #16
davada is offline davada  Canada
diyAudio Member
 
Join Date: Jul 2004
Location: Fort St John, BC Canada
Edmond try removing the .exe extension and re-zip.
Users can add the extension after DL.

Works for me when emailing exe's.
__________________
David.
  Reply With Quote
Old 6th December 2017, 03:20 AM   #17
davada is offline davada  Canada
diyAudio Member
 
Join Date: Jul 2004
Location: Fort St John, BC Canada
Have you played around with the Hilbert transform.
It's quite cool. One can generate the cosine of a signal. Make the other half for FFT.
__________________
David.
  Reply With Quote
Old 6th December 2017, 06:18 AM   #18
mbrennwa is offline mbrennwa  Switzerland
diyAudio Member
 
mbrennwa's Avatar
 
Join Date: Mar 2005
Location: Zurich, Switzerland
Quote:
Originally Posted by Edmond Stuart View Post
The residual is obtained by subtracting a pure sine from the (coherent integrated) input signal.
But how do you determine the amplitude and the time / phase shift of the signal used to subtract?
__________________
[ audioroot.net | hifibau.ch ]
  Reply With Quote
Old 6th December 2017, 01:15 PM   #19
Edmond Stuart is offline Edmond Stuart  Netherlands
diyAudio Member
 
Edmond Stuart's Avatar
 
Join Date: Nov 2003
Location: Amsterdam
Indeed, a good question. To do it right and accurately, it is far from easy. As for the fundamental, hundreds lines of code were needed to extract the frequency, phase, amplitude and offset from the data. How exactly I've done it, I won't tell you, sorry. But it is done as accurate as possible with an error rate in the order of 1E-6 to 1E-22, depending on the background noise, of course (as you know: 'garbage in, garbage out', which also applies in this case, alas).
__________________
http://www.data-odyssey.nl/
  Reply With Quote
Old 6th December 2017, 01:39 PM   #20
Edmond Stuart is offline Edmond Stuart  Netherlands
diyAudio Member
 
Edmond Stuart's Avatar
 
Join Date: Nov 2003
Location: Amsterdam
Quote:
Originally Posted by bk856er View Post
Microsoft Security Essentials says the zip contains a virus and automatically deletes the file. This is a first for me. Safe or no?
BK
It is a false positive as only two out of 60 virus scanners are wining about "not-a-virus:AdWare.Win32.Gamevance.gen", see list below (generated by virustotal.com). Anyhow, a virus or not, it's harmless.
Cheers, E.
Attached Images
File Type: jpg virustotal.jpg (116.4 KB, 675 views)
__________________
http://www.data-odyssey.nl/
  Reply With Quote

Reply


DiAna, a software Distortion AnalyzerHide 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
Analyzer Software Overview dennis h Equipment & Tools 153 10th December 2017 07:40 AM
Distortion analyzer troystg Equipment & Tools 5 7th December 2016 06:11 AM
True RTA analyzer software JAY X Equipment & Tools 5 18th October 2016 01:29 PM
Spectrum Analyzer software recommendations head_unit PC Based 8 22nd January 2012 06:39 AM
HP8903B Audio Analyzer Software Conrad Hoffman Equipment & Tools 11 1st June 2010 01:21 PM


New To Site? Need Help?

All times are GMT. The time now is 04:40 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki