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6th July 2009, 10:25 AM  #281  
diyAudio Member
Join Date: Mar 2003
Location: Denmark, Copenhagen

Quote:
We really need a numerical example to justify the faded inverses used by DRC and others. I have tried several transfer functions that all validates my method  Power expansion like y = 0.5x + 0.1x^2 + 0.2x^3 + 0.1x^4 +...  Clipping to amplitude en after multiplied buy 1.25  Introducing echoes y[i] = 0.5x[i] + 0.2x[i100]  0.2x[i1000] My problem is that they use intuitive arguments for fading the inverse. We need a transfer function / filter that will prove that using the real inverse is not working. 

6th July 2009, 11:04 AM  #282 
diyAudio Member
Join Date: Oct 2008

Fade in/out is only beneficial for people using the Farina method to generate the inverse as it reduces the transients at the beginning/end that otherwise cause errors in deconvolution. When the inverse is derived from the FFT of the stimulus fading in/out offers only cosmetic benefit, i.e. the FFT of the stimulus looks nicer and there is no possibility of an audible click at the end of a band limited sweep.

6th July 2009, 11:16 AM  #283  
diyAudio Member
Join Date: Mar 2003
Location: Denmark, Copenhagen

Quote:
(since I use FFT to create the exact inverse) NB: When making LP/HP measurements in HOLMImpulse there is indirectly fading to the signal since the logsweep is convolved with a LP/HP FIR filter. The inverse is still the inverse of the fullrange logsweep. Så the LP/HP is "simulating" a digital filter in the speaker. 

6th July 2009, 11:23 AM  #284  
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Join Date: Oct 2008

Quote:


6th July 2009, 01:30 PM  #285 
diyAudio Member
Join Date: Apr 2007
Location: China Grove, NC

Vista
I have been following this thread but I have been unable to get HolmImpulse to run on my Vista system. Does anyone else have trouble?
I have updated it several times and it updates but then won't load Tom 
6th July 2009, 01:38 PM  #286  
diyAudio Member
Join Date: Mar 2003
Location: Denmark, Copenhagen

Re: Vista
Quote:
 Does the msipackage install?  Any erros when starting? 

6th July 2009, 01:55 PM  #287  
diyAudio Member
Join Date: Mar 2003
Location: Denmark, Copenhagen

Quote:


6th July 2009, 04:15 PM  #288 
diyAudio Member
Join Date: Mar 2006
Location: Westchester County, NY

New Release 1.2.0.2
First, thanks for this great software. I find it works very well and has (I think) an intuitive interface. After struggling to perform measurements with SpeakerWorkshop for several years this is a huge improvement.
Unfortunately, one of the two machines I use this on is a rather old desktop that does not include SSE2 (the other is an SSE2 enabled laptop). Thus I have what may seem to be a bit of an odd request. I downloaded the latest version and of course it does not work on my non SSE2 enabled desktop. Unless there is some way to make the new version run on my ancient hardware, I would really appreciate it if someone could please send me the install file for the previous version so that I could at least continue to use the desktop for measurements until I upgrade this machine in the fall. TIA Again, thanks for a really intriguing and useful piece of software! 
6th July 2009, 07:05 PM  #289  
diyAudio Member
Join Date: Mar 2003
Location: Denmark, Copenhagen

SSE2
Quote:
http://www.holmacoustics.com/downloa...se1.2.0.0.msi I'll introduce the specific SSE2 version again from 1.2.0.4 

7th July 2009, 12:41 PM  #290  
diyAudio Member
Join Date: Apr 2007
Location: China Grove, NC

Re: Re: Vista
Quote:


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