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#141 | |
diyAudio Member
Join Date: Feb 2008
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No, because that conflicts with the "Gaussian-derived" highpass section.
My vote is for "higher-order Gaussian-like". It's a mouthful, but at least it's not ambiguous. Quote:
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#142 |
diyAudio Member
Join Date: Mar 2008
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Apology my gross ignorance. How do you manage to get preshoot and ringing, with negative values, on your so-called "Gauss" lowpass ?
Here is the code I'm using for generating a Gauss FIR and I don't understand how to enhance it for getting preshoot and ringing. Gauss = Me.FIR2_Box1.Text FIR2_coeff(m) = 1 For i As Integer = 1 To n arg = i / Gauss val = Math.Exp(-arg * arg) FIR2_coeff(m + i) = val FIR2_coeff(m - i) = val Next Steph |
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#143 | ||
diyAudio Member
Join Date: Feb 2009
Location: UK
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Quote:
Quote:
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#144 |
diyAudio Member
Join Date: Mar 2008
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Now I understand, thanks. I'm attaching the corresponding design form.
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#145 | ||
diyAudio Member
Join Date: Feb 2009
Location: UK
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Any experts on patents here?
Just looking at the Neville Thiele patent for crossover filter with notched response: http://www.pat2pdf.org/patents/pat6854005.pdf Claim 19 says the following Quote:
Quote:
But supposing, instead, we sold a program, or an electronic box, with a user interface that allowed the user to specify basically any filter they wanted. How would the patent work with that sort of thing? Would the program have to mask out certain no-go areas that were covered by patents? I'm just curious. |
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#146 |
diyAudio Member
Join Date: Dec 2011
Location: The Dells, WI
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gberchin ... noticed that you had stated a relationship w/EV. I'm curious, if you know, as to how well their Bessel filters (2,3,4th order) found in the DX34A series digital processors approximate the idealized Gaussian filter(s)?
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#147 | |
diyAudio Member
Join Date: Feb 2008
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Quote:
In answer to your question: If EV is still using the Bessel filters that I designed for the DSP56K processor family, then they are textbook implementations of analog Bessel filters converted to digital by means of the bilinear transform, with prewarping to match the analog prototypes at the -3 dB frequencies. Their precision and accuracy are very close to the maximum possible in a 24-bit context because extended-precision is used for the internal calculations. So, basically, they are about as good an approximation to Gaussian filters as 24-bit Bessel filters can be. If EV has changed processors (or implementations), then I am unable to speak to what might be there. |
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#148 |
diyAudio Member
Join Date: Sep 2008
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iDFT XO CGn does not work as it can not write to c:/iDFT_XO_CGn.txt
Creating a file with permission and ownership changes nothing as win7 won't allow it. It is also bad practice to write there as EVE online found out when they modified autoexec.bat (which was their launch script) but accidentally took c:/ one instead. |
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#149 | |
diyAudio Member
Join Date: Mar 2008
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Quote:
post #1 post #6 The file gets written in a more suitable directory. |
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#150 |
diyAudio Member
Join Date: Sep 2008
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Thanks, didn't see that thread. I was using the version posted above in #144
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