diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Software Tools (http://www.diyaudio.com/forums/software-tools/)
-   -   HOLMImpulse: Measuring Frequency- & Impulse-Response (http://www.diyaudio.com/forums/software-tools/144984-holmimpulse-measuring-frequency-impulse-response.html)

askbojesen 29th May 2009 03:02 PM

HOLMImpulse: Measuring Frequency- & Impulse-Response
 
Hi,

I have developed a freeware program called HOLMImpulse for speaker gain and phase response measurement.

HOLMImpulse is Non-Commercial freeware with full functionality (No limitations or trial periods) running on Windows XP/Vista

Download HOLMImpulse here

The purpose of the application is to:
- Work with any soundcard
- Easy and fast to use
- Measure Frequency-response (gain and Phase)
- Measure Impulse-response
- Dynamically/Automaticly adjust the time window (Gating)
- Use cross-correlation techniques with logsweep, chirp or MLS
- Very good signal/noise ratio (Due to cross-correlation)
- Make bandwitdh limited measurements with no phase-errors
- Measure Harmonic distortion (THD)
- Compare measurements (50 slots, and 3 shown at a time)
- Easy open/save import/export measurements in any format
- Be freeware with full functionality (Up to 192KHz, 24 bit)
- Manipulate measurements (Lowpass, highpass, etc...)

I would like your response
I know that there is no manual, but we are all geeks who rather want features than manuals - right?
- Simply define select your soundcard and click measure
- I would like you to reply in this post and tell me if you have had any success with the program
- And of course post your measurements ;-)
- If you have any difficulties getting this to work, then I'll assist you in this thread

NB I am working for
HOLM Acoustics (A new small Danish Company),
but I have no commercial interest in HOLMImpulse, which is mostly developed in my spare time. The core libraries used in HOLMImpulse are the same as in
HOLMFIR, which is a program used to configure the commercial product DSPre

http://www.holmacoustics.com/picture...n1_800x600.jpg

soongsc 29th May 2009 03:31 PM

Very interesting. I like the 192KHz 24 bit

doug20 29th May 2009 03:38 PM

Thanks!

Can a calibrated ECM8000 mic measure THD accurately?

I have been learn to use trueRTA and ARTA. I have used REW for years.




SY 29th May 2009 03:43 PM

Excellent! I've downloaded it and as soon as we're moved and unpacked, I'm anxious to give it a try. Thanks for providing this to the community.

Thawach 29th May 2009 04:34 PM

i know u will post . askbojesen great! i already sent the link to my friends in thailand. thanks a lot my friend.;)

David_Web 29th May 2009 05:15 PM

Thanks. I have used it for quite a while and like it. Ill dl the latest version.
It's always nice to meet the author.
That way you know who to bug for features and bugs ;)


So thanks again for all your hard work. It is really appreciated.

Dr_EM 29th May 2009 06:00 PM

It sounds good! I haven't had much luck with taking measurements in the past, but perhaps this will be better for me. Thanks for providing this software!


Not to be too OT, but could I use the panasonic capsule mics, connected to a normal mixer and powered with phantom power, to take measurements? Leaving EQ and high pass off naturally. I have built mics like this in the past for recording, all i'd need to change is the mounting of the capsule (placing it on a wand) :)

askbojesen 30th May 2009 11:16 AM

Microphone calibration
 
Quote:

Originally posted by Dr.EM

Not to be too OT, but could I use the panasonic capsule mics, connected to a normal mixer and powered with phantom power, to take measurements? Leaving EQ and high pass off naturally. I have built mics like this in the past for recording, all i'd need to change is the mounting of the capsule (placing it on a wand) :)

As I posted in DIY measurement mic
We have a calibration file for the wm61a:
http://www.holmacoustics.com/downloa.../Mic_WM61A.cal

But of course any microphone calibration can be used in HOLMImpulse
  • Exspects data in columns:
    Frequency <seperator> dB <seperator> phase <eol>
  • Ignores lines not starting with a number
  • Accepts the following seperators: space, semicolon, tabular
  • Accepts , and/or . as decimal point

Import microphone calibration
http://www.holmacoustics.com/picture...n2_800x600.jpg

Three different wm61a capsules
http://www.holmacoustics.com/forumpi...fmicsWM61A.png

Dr_EM 30th May 2009 11:34 AM

That's excellent! Yes, those are the capsules I used. The Linkwitz mod doesn't make any difference to the frequency response does it, just to the max SPL handled? I have some unmodified and some modified, but heard that during the mod it is possible to break the seal and upset the low frequency response, so I'd sooner trust my unmodified capsules :)

aduljr 30th May 2009 06:02 PM

documentation
 
How about a community wiki for the documentation? Let us help contribute to it as well. :)


All times are GMT. The time now is 05:15 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2