[Music] Re: [Audacity-devel] New Nyquist effects: cross-fades

[Alexandre Prokoudine]

--- Письмо переслано от Erich Neuwirth
<erich.neuwirth at univie.ac.at> ---

Date: Mon, 16 Feb 2004 22:14:55 +0100
From: Erich Neuwirth <erich.neuwirth at univie.ac.at>
Reply-To: audacity-devel at lists.sourceforge.net
Subject: Re: [Audacity-devel] New Nyquist effects:
cross-fades
To: audacity-devel at lists.sourceforge.net

your function is not smooth,
1-x^2 has a "sharp edge" at x=1.
You cuould use

f(x)=1-2*x^2 for 0<x+<=1/2
f(x)=2*(1-x)^2 for 1/2<x<=1

to get a smoother fade.





Dominic Mazzoni wrote:
> I needed a true cross-fade for something I was
working on, so
> I implemented cross-fade-in and cross-fade-out as
Nyquist effects.
> 
> The fade-in function is just f(x)=1-x^2 and fade-out
is f(x)=1-(1-x)^2.
> When you fade one track out and the other one in with
this function,
> the average (RMS) signal level stays the same, so
it's handy for
> creating loops.
> 
> - Dominic
> 
> P.S. I have no idea what's going on, but I've been
trying to post to
> the list from three different computers for over a
week, and all of
> my posts are still being rejected!  As soon as I
figure out what's
> going on, I'll catch up on everything.
> 
> 
> 
> 
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Erich Neuwirth, Computer Supported Didactics Working Group
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