[LAD] Mixing audio: Noiseless volume changes

Fons Adriaensen fons at linuxaudio.org
Tue Mar 19 23:29:59 UTC 2013

On Tue, Mar 19, 2013 at 06:12:21PM -0500, Charles Z Henry wrote:

> If it was always a fixed time over which you need to fade in, I think you
> could find a good analytical function to use, or make a table that always
> has a predictable effect.

Raised cosine is a good solution, but you don't need
sines and cosines. Try e.g.

    x * x * (3 - 2 * x)

with x in [0...1].

This can even be generated using only additions.



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