CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

  • December 31, 2015, 11:10:05 AM
  • Welcome, Guest
Please login or register.

Login with username, password and session length
Advanced search  
Pages: [1] 2

Author Topic: Diffuse field EQ  (Read 2595 times)

0 Members and 1 Guest are viewing this topic.

Marvey

  • The Man For His Time And Place
  • Master
  • Pirate
  • *****
  • Brownie Points: +555/-33
  • Offline Offline
  • Posts: 6698
  • Captain Plankton and MOT: Eddie Current
Diffuse field EQ
« on: May 05, 2012, 04:48:47 AM »
Does anyone have any nice graphs, papers, or links on diffuse field EQ?  I need them for compensating IEM measurements.


Thanks.
Logged

ujamerstand

  • Guest
Re: Diffuse field EQ
« Reply #1 on: May 05, 2012, 04:58:03 AM »
Uh... I've got some on implementing diffuse field EQ as a DSP. Need to dig them up though.

Photocopied an article called "Determination of Noise Immision From Sound Sources Close to the Ears" today, which is suppose to describe some good measurement techniques. My university's subscription to online full text articles is wonky recently. I'll send you a copy when the access is good?

Edit: No, I have stuff on generating proper HRTFs by compensating it with diffuse field EQ. In the tutorial it is simply defined as the average of all HRTFs from all directions. Which should model just the ear canal (and probably the concha). http://xenia.media.mit.edu/~mkc/micArray/node13.html
« Last Edit: May 05, 2012, 05:10:20 AM by ujamerstand »
Logged

RexAeterna

  • Gigolo of Gigolos
  • Mate
  • Pirate
  • ****
  • Brownie Points: +355/-1
  • Offline Offline
  • Posts: 1373
  • Friendship is magic
Re: Diffuse field EQ
« Reply #2 on: May 05, 2012, 05:18:26 AM »
will these work?

www.aes.org/technical/documentDownloads.cfm?docID=175

www.neumann.com/download.php?download=lect0025.PDF

looking for more, but these only one i found that the links would work properly with. i scanned them real quick though so don't know exactly if they're what you're looking for. seems to though explain different compensations between free-field and diffused-field
Logged
''I'm a music lover. Not an audiophile.''

''The World is Study.''

''I have no special talent. I am only passionately curious.''

''Logic will get you from A to B. Imagination will take you everywhere.''

ultrabike

  • Burritous Supremus (and Mexican Ewok)
  • Master
  • Pirate
  • *****
  • Brownie Points: +4226/-2
  • Offline Offline
  • Posts: 2384
  • I consider myself "normal"
Re: Diffuse field EQ
« Reply #3 on: May 05, 2012, 05:19:00 AM »
Logged

Marvey

  • The Man For His Time And Place
  • Master
  • Pirate
  • *****
  • Brownie Points: +555/-33
  • Offline Offline
  • Posts: 6698
  • Captain Plankton and MOT: Eddie Current
Re: Diffuse field EQ
« Reply #4 on: May 05, 2012, 06:52:15 AM »
Wow, I feel my head is about to explode.
Logged

rhythmdevils

  • Mate
  • Pirate
  • ****
  • Brownie Points: +131/-65535
  • Offline Offline
  • Posts: I am a geek!!
  • Team Cheap, Picky Basterds
    • www.my40dollarorhosarebetterthanyour1kflagship.com
Re: Diffuse field EQ
« Reply #5 on: May 05, 2012, 07:05:14 AM »
Mine already exploded  :P
Logged

Marvey

  • The Man For His Time And Place
  • Master
  • Pirate
  • *****
  • Brownie Points: +555/-33
  • Offline Offline
  • Posts: 6698
  • Captain Plankton and MOT: Eddie Current
Re: Diffuse field EQ
« Reply #6 on: May 05, 2012, 07:11:04 AM »

Anyone have access to that ISO standard? Hate having to pay for everything from them.
Maybe I should just look at all the raw data I have and invent my own curve. Seems that every other scientist and measurement head vendor has their own version which is slightly different.
Logged

ujamerstand

  • Guest
Re: Diffuse field EQ
« Reply #7 on: May 05, 2012, 07:34:12 AM »
ISO 4869? ISO 11904? I can check with the library tomorrow.
« Last Edit: May 05, 2012, 07:37:33 AM by ujamerstand »
Logged

ujamerstand

  • Guest
Re: Diffuse field EQ
« Reply #8 on: May 05, 2012, 07:49:47 AM »
« Last Edit: May 05, 2012, 08:17:43 AM by ujamerstand »
Logged

ultrabike

  • Burritous Supremus (and Mexican Ewok)
  • Master
  • Pirate
  • *****
  • Brownie Points: +4226/-2
  • Offline Offline
  • Posts: 2384
  • I consider myself "normal"
Re: Diffuse field EQ
« Reply #9 on: May 05, 2012, 08:01:14 AM »
Not sure if ISO 532 is what you need:

Also, check slides 11 through 14 here (ISO 532B):
http://www.sae.org/events/nvc/workshops/2009/wadebray4.pdf

MATLAB code abstract (and link):
"I am including (what I think is) a working matlab program for the
calculation of loudness according to DIN45631 / ISO 532 B.  It reads a sound
from a wav file, calibrates the data, filters it into 1/3 OBs, and then
calculates Loudness and Specific Loudness."
http://www.auditory.org/mhonarc/2000/msg00498.html
Logged
Pages: [1] 2
« previous next »