Hello,
I have a couple of questions pertaining to fft~.
- 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?
- 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@aproximation.org
maybe this will help: http://www.parasitaere-kapazitaeten.net/Pd/fft_und_pd_en.htm if you just want to use the envelope of the adc~ to control another sound you can also just filter it with a lopass (lop~ 10) and multiplicate it with your straight tone. marius.
----- Original Message ----- From: "MC DANIEL WADE ARCHIE" mcdaniew@ucsu.colorado.edu To: pd-list@iem.kug.ac.at Sent: Sunday, April 13, 2003 2:25 AM Subject: [PD] fft question
Hello,
I have a couple of questions pertaining to fft~.
- 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?
- 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@aproximation.org
PD-list mailing list PD-list@iem.kug.ac.at http://iem.kug.ac.at/cgi-bin/mailman/listinfo/pd-list
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~.
- 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?
- 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@aproximation.org
PD-list mailing list PD-list@iem.kug.ac.at http://iem.kug.ac.at/cgi-bin/mailman/listinfo/pd-list
-
Ben Saylor -
marius schebella -
MC DANIEL WADE ARCHIE