Re: [Audacity-nyquist] Problem with this plug-in in stereo

[<edg...@we...>]

Hi David,

I just did something similar the last two hours:

I have added a high pass filter to the rectifier function. Now you can
apply the effect as often as you like wihout causing a up or down
shifting or a bias, as I assume, is the correct term. Shifting usually
means a shifting in time. But it was me who had started to use confusing
terms.

The new function is:

(defun rectify (signal rectifyt offset)
(normalize (mult 2.0 (hp
(if (= rectifyt 1)
(sum (pos s) (neg s))
(pos s))
20)) ; cutoff frequency of the highpass filter
))

The offset now can be completely ignored because it is eliminated by the
high pass filter. A little drawback is that in the first fifty milliseconds
now there is a short glitch because the highpass filtes needs some time to
come to work. But this is the same with electronic filters and not a
Nyquist bug.

I have tried several other high pass filters up to highpass8 but the higher
the q factor and therefore the cutoff steepness the worse becomes the ripple
in the first few milliseconds. A simple high pass worked best.

I have sent the modified plugin to your private adress. Please have an ear
on it wether it still sounds like you had wanted it to be and if you like
it we can post it back to the list.

Have a nice day,

- edgar


the rest is the transcript of the original message

aud...@li... schrieb am 28.11.05 09:39:07:
> 
> Hi Edgar,
> 
> I've attached rectimod.ny , with highpass8 at 20Hz and lowpass8 at 20khz, 
> filtering the (sim ...) statement. Is this adequate, or do I need to apply 
> the filters to the rectified signal before it gets re-mixed with the dry 
> signal?
> 
> Thanks
> 
> David
> 
> 

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