6 May
2003
6 May
'03
8:33 a.m.
--- nickt <nicktsocanos(a)charter.net> wrote: > Hi,
Sorry if this is the wrong list. I have never found a
list with people
who can help me with these kind of questions.
I am trying to figure out how a rectifier works in code. I have created
something like it using tanh() distribution ( which will turn a sine
wave into a sort-of-square wave). I can also achieve it with hard
clipping/saturation. In the same sense I'd also like to know how a
smooth operation works as well. I can not find any source code or
explanations to help me figure out the algorithm yet.
My other question is how are exponential signals generated? I want to
experiment with exponential FM. My only understanding of Exp. Fm is that
it sweeps half down and full up ( at 440hz, it would sweep 220hz down
and 880 hz up). I haven't much of an idea how this is achieved. How do I
convert a sine wave into an exponential signal for Exp FM?
freq * pow(2.0, sin(x))
will modulate a frequency in this way.
e.g. 440 * pow(2.0, 1.0) will raise by 1 octave (880Hz)
440 * pow(2.0, -1.0) will lower by 1 octave (220Hz)
So an unscaled sine wave will do a 2 octave sweep.
Mike
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