Re: [Audacity-devel] EQ response curve speedup patch

[Martyn S. <mar...@gm...>]

Hi

This is the last msg I can easily find on this subject on 
audacity-devel so I am responding to it.  Sorry if I missed something. 
  There were some pms.

 From my POV, we either display the green 'what you get' curve or we 
don't, we should not approximate it.

We should maybe have an option to turn it off, if it is a problem 
if/when we get to 'real time'.

Meanwhile we could use the attached patch, an idea I had from FFT code 
in Numerical Recipes (NR) to calculate cosines from previous values.

Please test, I think it halves the response time.  How does it work 
for you?  Optimisations are in the tightest loop.

TTFN
Martyn

On 04/02/2014 03:48, Andrew Hallendorff wrote:
> Thanks so much for showing me the faults and such.
>
> I do think that that skew in your first graph was the misplaced &&
> that should of been a || as it didn't show up for me. Although it is
> there to protect division by zero? Huh.
>
> I may investigate it tomorrow.
>
> Check out the updated version with overlay. (attached pic)
>
> No strange blip in the data.
>
> The (green) graph actually looks like the fingers or sidelobes they
> talk about when referring to filter leakage. I don't know the nuances
> of filter problems like you do, but I'm learning. What do you think?
>
> Here's a patch with the fixed (||&&) as well. (Original and Lagrange
> code active)
>
> Andrew
>
> On 2/3/2014 7:56 PM, Martyn Shaw wrote:
>> HPF Leg prob
>
>
>
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