[PD] fft question

[Ben Saylor]

You probably want to use rfft~ and rifft~ (I'm not sure how one would 
use fft~ and ifft~, which take complex input, I think).  The input to 
rfft~ is the time-domain signal to be transformed.  The left output is 
the N/2 real components of the complex result, and the right output is 
the N/2 imaginary components, (or is it vice-versa?) where N is the 
blocksize.  rifft~ is just the inverse of that (swap the inputs and 
outputs), except you need to divide each input first by N to bring the 
output down to the right level.

Ben

On Saturday 12 April 2003 7:25 pm, MC DANIEL WADE ARCHIE wrote:
> Hello,
>
> I have a couple of questions pertaining to fft~.
>
> 1. How does one convolve using fft? Is there a way to just get the
> amplitude of, say , something from adc~ and convolve that with a
> straight tone?
>
> 2. What does the rfft~ operand return from its three outlets?
>
> Ive looked through some of the help files on fft~ and they dont get
> down to preconditions and postconditions for inlets and outlets, and
> thusly Im having trouble (this might in some way be related to the
> fact that Im basicaly a newbie). Any help will be greatly
> appreciated.
>
> Thank you for your time and patience,
> -the wade
> wade at aproximation.org
>
>
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