HOLMImpulse: Measuring Frequency- & Impulse-Response - diyAudio
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Old 29th May 2009, 03:02 PM   #1
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Location: Denmark, Copenhagen
Lightbulb 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

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Old 29th May 2009, 03:31 PM   #2
soongsc is offline soongsc  Taiwan
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Very interesting. I like the 192KHz 24 bit
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Old 29th May 2009, 03:38 PM   #3
doug20 is offline doug20  United States
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Thanks!

Can a calibrated ECM8000 mic measure THD accurately?

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



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Old 29th May 2009, 03:43 PM   #4
SY is offline SY  United States
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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.
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Old 29th May 2009, 04:34 PM   #5
Thawach is offline Thawach  Thailand
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i know u will post . askbojesen great! i already sent the link to my friends in thailand. thanks a lot my friend.
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Old 29th May 2009, 05:15 PM   #6
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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.
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Old 29th May 2009, 06:00 PM   #7
Dr_EM is offline Dr_EM  United Kingdom
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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)
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Old 30th May 2009, 11:16 AM   #8
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Default 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
Click the image to open in full size.

Three different wm61a capsules
Click the image to open in full size.
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Old 30th May 2009, 11:34 AM   #9
Dr_EM is offline Dr_EM  United Kingdom
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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
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Old 30th May 2009, 06:02 PM   #10
aduljr is offline aduljr  United States
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Default documentation

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