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

Multi-Way Conventional loudspeakers with crossovers

(1/12th etc..) Octave Smoothing Algorithm
(1/12th etc..) Octave Smoothing Algorithm
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 3rd April 2006, 09:47 PM   #1
digidocs is offline digidocs  United States
diyAudio Member
Join Date: Apr 2006
Location: Houston
Default (1/12th etc..) Octave Smoothing Algorithm

I've been doing some MLS measurements with some homebrew software lately. I can calculate frequency responses pretty well but I'd like to be able to do 1/8th, 1/12th, etc. octave smoothing to make my results directly comparable to other packages. Does anyone have any references for these smoothing aglorithms? I'd like to know what the actual math is...

David Carr
  Reply With Quote
Old 14th February 2007, 07:37 AM   #2
annex666 is offline annex666  England
diyAudio Member
annex666's Avatar
Join Date: Jul 2002
Location: England
I imagine it would involve calculating the midpoint of the 1/8th or 1/12th octave band, then averaging the response across the region +/-1/16th or +/- 1/24th regions around those midpoints.

The 1/12th, etc measurements you see from commercial software are often in the form of a bar chart/histogram - this would suggest that
what I say above is true.

There could be more complex ways of doing the same thing - i.e. calculation of a Gaussian curve that has 1/12th octave bandwidth at each 1/12th octave middle point - then use this to weight the average.

There are many ways to do it, but without seeing the source I can't tell you how a specific commercial software package does this.

Hope this helps.

..also I'm about to start work on my own measurement system for LTI systems (based on MLS techniques), so you might see a post from me on the forum with some screenshots (when I finally get round to it!)
...if it ain't broke don't fix it - make it BETTER!
  Reply With Quote


(1/12th etc..) Octave Smoothing AlgorithmHide 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
evolution algorithm Jamh Everything Else 0 8th June 2009 05:04 PM
12th fret harmonic Aidan135711 Instruments and Amps 11 5th March 2008 08:36 PM
CSD algorithm claudio Multi-Way 3 8th May 2005 02:50 PM
Auto EQ Algorithm dswiston Digital Source 5 22nd April 2005 01:32 PM
linear algebra / DSP help -- levison algorithm theChris The Lounge 1 21st February 2005 01:49 AM

New To Site? Need Help?

All times are GMT. The time now is 03:22 AM.

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