Hi Ask,
After measuring a few electrical circuits to check if all is well I measured my coax nearfields today at ~25cm distance (but with a VERY crude "measurement" mic and q&d setup, you don't wanna know. Look at the low sensivity and the ~3% THD which is 2nd-HD mostly, dominated by the "mic pre" -- there wasn't any, that is --, the speakers themselves are not *that* bad, same for the mag response
).
Looks pretty nice, the 360° deg phase shift (centered to ~1.6kHz, which is the XO freq of these 2-ways) is clearly visible.
Some small issues I found:
- Impulse start estimation goes wrong. But then again, the shifter works well (a bit slow, though) and is a needed feature anyway. You have addressed that already, I see. EDIT: Sample offset isn't remembered between runs, although the display is fine. No deal, since it's a "relative" value anyway.
- I'd prefer to have a "not always in foreground" option, regarding some displayed windows.
- A initial delay would be a nice option (say 10sec, checkbox) to get out of the room etc before the sweep starts.
All in all, thumbs up! Stuff like the markers to locate the harmonics is really nice.
- Klaus
After measuring a few electrical circuits to check if all is well I measured my coax nearfields today at ~25cm distance (but with a VERY crude "measurement" mic and q&d setup, you don't wanna know. Look at the low sensivity and the ~3% THD which is 2nd-HD mostly, dominated by the "mic pre" -- there wasn't any, that is --, the speakers themselves are not *that* bad, same for the mag response
).Looks pretty nice, the 360° deg phase shift (centered to ~1.6kHz, which is the XO freq of these 2-ways) is clearly visible.
Some small issues I found:
- Impulse start estimation goes wrong. But then again, the shifter works well (a bit slow, though) and is a needed feature anyway. You have addressed that already, I see. EDIT: Sample offset isn't remembered between runs, although the display is fine. No deal, since it's a "relative" value anyway.
- I'd prefer to have a "not always in foreground" option, regarding some displayed windows.
- A initial delay would be a nice option (say 10sec, checkbox) to get out of the room etc before the sweep starts.
All in all, thumbs up! Stuff like the markers to locate the harmonics is really nice.
- Klaus
Attachments
Yes! Exactly my pointKSTR said:
even with a Quick and dirty measurement you learn a lot 
Yes I know that... I have a new version ready later this evening handling this issue with time zero much better. A bit slow? if you set the measurement save length down it will be faster, but you will loose some data.
Are you measuring lethal high volumes? - or why do you want to leave the room?
/Ask
New Release: Improved time zero detection
http://www.holmacoustics.com/downloads/HOLMImpulse/ChangeLog.txt
The time zero detection failures in above measurements made by Klaus and panomaniac should be fixed now.
(Try measure again with the new default settings)
NB: If you start HOLMImpulse while online the autoupdater detects new version available
Version 1.1.5.6 (2009-06-16)
Features/Changes:
* 0dB Normalization optional (Enabled by default)
* Time window auto-apply optional (Enabled by default)
* Stich measurement with phase and gain optional
* Match measurement with phase optional
* Detection of time zero improved and configurable
* LogSweep highpass of the resulting impulse response
Bugfixes:
* Impulse domain: Autozoom for not normalized measurements
* Normalization (Shift dB did not include pregain)
Notes:
* Code-cleanup for normalization
* Remake of detection of time zero
http://www.holmacoustics.com/downloads/HOLMImpulse/ChangeLog.txt
The time zero detection failures in above measurements made by Klaus and panomaniac should be fixed now.
(Try measure again with the new default settings)
NB: If you start HOLMImpulse while online the autoupdater detects new version available
Version 1.1.5.6 (2009-06-16)
Features/Changes:
* 0dB Normalization optional (Enabled by default)
* Time window auto-apply optional (Enabled by default)
* Stich measurement with phase and gain optional
* Match measurement with phase optional
* Detection of time zero improved and configurable
* LogSweep highpass of the resulting impulse response
Bugfixes:
* Impulse domain: Autozoom for not normalized measurements
* Normalization (Shift dB did not include pregain)
Notes:
* Code-cleanup for normalization
* Remake of detection of time zero
Attachments
Thanks again, Ask!
I'll try it later today with a real measurement.
And I already have another (not so) silly "option/display request" (I can hear you yelling "OMG, please, not HE again") : Group delay, obtained from a reasonably smoothed phase response (to avoid the typical increase in "roughness" from the numerical derivation of gd(omega) = -d(phi)/d(omega)).
- Klaus
I'll try it later today with a real measurement.
And I already have another (not so) silly "option/display request" (I can hear you yelling "OMG, please, not HE again"
) : Group delay, obtained from a reasonably smoothed phase response (to avoid the typical increase in "roughness" from the numerical derivation of gd(omega) = -d(phi)/d(omega)).- Klaus
I've been curious, so I tried it a bit today. After some fumbling around with XP and one of the sound cards installed, I got a measurement. The card is a Turtle Beach Fiji (44.1K sampling limit) that I still use with LAUD for measurements. It has a built-in high quality mic pre-amp. I use a dual-boot setup for Win98/XP Home Edition.
I tried to do a calibrate of the card, but could get no further measurements afterwards. Other apps that used the card would not output, either. After unistalling/reinstalling it cleared up. I also made sure that windows was set to no sounds (it was blank in the setting). The card shouldn't need a calibration andyway as it should be down at most 0.5db at 20K.
The driver is mounted on a 2m x 2m baffle with the mic at 0.5m on-axis.
The problem I have is that below 1K, I don't get good agreement. It likely has to do with the window as this area changes more with the window selected. I believe that I used a half Blackman-Harris in LAUD. It would be good to have options for type of window (or have I missed that?).
The measurement capture:
Overlay of LAUD and HOLMImpulse (using Praxis for display only):
Dave
I tried to do a calibrate of the card, but could get no further measurements afterwards. Other apps that used the card would not output, either. After unistalling/reinstalling it cleared up. I also made sure that windows was set to no sounds (it was blank in the setting). The card shouldn't need a calibration andyway as it should be down at most 0.5db at 20K.
The driver is mounted on a 2m x 2m baffle with the mic at 0.5m on-axis.
The problem I have is that below 1K, I don't get good agreement. It likely has to do with the window as this area changes more with the window selected. I believe that I used a half Blackman-Harris in LAUD. It would be good to have options for type of window (or have I missed that?).
The measurement capture:
Overlay of LAUD and HOLMImpulse (using Praxis for display only):
Dave
Reinstallation Problems
Hi All,
- I downloaded the first version ( when the first thread came into existance ) & successfully ran the software for some time .
- This morning I "unintalled it" as preparation for installing the latest version being offered ( 1.1.6.6 ) .
- Well, I downloaded the installer / but it won't run ( & install the newer version ).
- I also tried running the installer ( not downloaded ) from within my browser ( IE8 ) .
- I am online when I attempt either insall approach.
- I get an official message box telling me the program is not a valid installer ( this box appears after the first official warning that the installer program is “unpublished” )
- I'm running Windows XP SP3 .
- I've turned off all aspects of Norton & rebooted ( just in case that's necessary )
- NOTE: I'm really a long-time Mac guy so I'm out here in lala land when it comes to installation problems such as this .
Can anyone help me out here ? Thanks Muchos for your time !
>, EarlK
Hi All,
- I downloaded the first version ( when the first thread came into existance ) & successfully ran the software for some time .
- This morning I "unintalled it" as preparation for installing the latest version being offered ( 1.1.6.6 ) .
- Well, I downloaded the installer / but it won't run ( & install the newer version ).
- I also tried running the installer ( not downloaded ) from within my browser ( IE8 ) .
- I am online when I attempt either insall approach.
- I get an official message box telling me the program is not a valid installer ( this box appears after the first official warning that the installer program is “unpublished” )
- I'm running Windows XP SP3 .
- I've turned off all aspects of Norton & rebooted ( just in case that's necessary )
- NOTE: I'm really a long-time Mac guy so I'm out here in lala land when it comes to installation problems such as this .
Can anyone help me out here ? Thanks Muchos for your time !
>, EarlK
Strange that it wouldn't work. I downloaded the 1st version and every one since has been an automatic update. Never unistalled anything. It just updates when I start the software.
So you still have the original version to try again? If that works, the software should take care of updating by itself when you start it.
So you still have the original version to try again? If that works, the software should take care of updating by itself when you start it.
- Actually, I'd rather talk about what a great place I found Maui to be
but I shouldn't hijack the thread .- I "uninstalled" the original version .
- As a Mac head, one assumed consequence of taking this action, is that the original program is no longer findable on my hard-drive.
- Is my assumption correct or incorrect ?
>< cheers
Ah yes.... how I do miss my Maui home.
Don't know if the origianl software is still there. Did you save the download somewhere or just run it right from the download/browser?
But anyway - I just downloaded the newest version
http://www.holmacoustics.com/downloads/HOLMImpulse/HOLMImpulse-1.1.6.6.msi
onto this computer that had no previous install of the software. Had no trouble at all. Installed and running. Win XP.
Don't know if the origianl software is still there. Did you save the download somewhere or just run it right from the download/browser?
But anyway - I just downloaded the newest version
http://www.holmacoustics.com/downloads/HOLMImpulse/HOLMImpulse-1.1.6.6.msi
onto this computer that had no previous install of the software. Had no trouble at all. Installed and running. Win XP.
- Thanks, the above statement gave me one last idea / which panned out for a successful installation .
- I went back to the "Program Files" on my hard-drive and noticed that there was still a folder ( though now empty ) called HOLMacoustics ( or something such ).
- My "uninstall", didn't remove this folder ( this is "strange" to a Mac guy ) .
- Once I sent the orphaned folder to the recycling bin, I was able to successfully run the programs' installer ( & download the latest version onto my computer ) .
- FWIW, the old preferences file ( called "settings" within the program ) was obviously left intact , since the newer version of the software opened up to my previous custom "look" .
>< cheers
HOLMImpulse directories
Glad to here you could install
HOLMImpulse system directory:
%ProgramFiles%\HOLM Acoustics\HOLMImpulse
Eg.
C:\Program Files\HOLM Acoustics\HOLMImpulse
HOLMImpulse settings directory:
%ALLUSERSPROFILE%\Application Data\HOLM Acoustics\HOLMImpulse
Eg.
C:\Documents and Settings\All Users\Application Data\HOLM Acoustics\HOLMImpulse
When you uninstall the settings directory is not deleted
(Standard windows procedure... I'm sorry)
I could implement checkboxes asking to clean settings directory also
and delete the system directory.
Glad to here you could install
HOLMImpulse system directory:
%ProgramFiles%\HOLM Acoustics\HOLMImpulse
Eg.
C:\Program Files\HOLM Acoustics\HOLMImpulse
HOLMImpulse settings directory:
%ALLUSERSPROFILE%\Application Data\HOLM Acoustics\HOLMImpulse
Eg.
C:\Documents and Settings\All Users\Application Data\HOLM Acoustics\HOLMImpulse
When you uninstall the settings directory is not deleted
(Standard windows procedure... I'm sorry)
I could implement checkboxes asking to clean settings directory also
and delete the system directory.
gedlee said:
Does the 32 bit versions work on Vista 64 bit???:
HOLMImpulse-1.1.6.6.msi or HOLMImpulse-1.1.6.6-sse2.msi
work on Vista 64? I thought you needed a special 64 bit compiled version.
No pre impulses from the harmonics
1. The measurement save length must equal the signal length
2. You must use log-sweep
3. Try ZoomOut and the dB scale
NB: In the next version of HOLMImpulse you will get an option to autosave the direct correlation as a wavefile for your own analysis
Perhaps post the graph?
