Re: using iFFT on a Continuous Time Transfer Function
- To: mathgroup at smc.vnet.net
- Subject: [mg48734] Re: using iFFT on a Continuous Time Transfer Function
- From: "Mariusz Jankowski" <mjankowski at usm.maine.edu>
- Date: Fri, 11 Jun 2004 23:59:02 -0400 (EDT)
- Organization: University of Southern Maine
- References: <ca6hrm$g76$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Vin, if you have an analytic expression why not try InverseFourierTransform. Go to Help Browser, look in Algebraic Computation -> Calculus -> InverseFourierTransform. Mariusz >>> Vin<car_d_active_unit at hotmail.com> 6/9/2004 4:30:46 AM >>> Hello, I know what my signal looks like in the frequency domain, because I have a analytic expression for that (i.e., a function of frequency). I don't have a time domain counterpart though, but I expect it to be a real valued pulse-like signal, lasting a few nanoseconds. I am wondering, can I somehow apply the IFFT to this frequency domain function to get a discrete time representation of the time domain counterpart? If so, any hints as to how to go about it? I have already tried sampling my frequency domain function to produce something like the output of a FFT, e.g., with the -ve frequency function values being generated from the complex conjugate of the positive frequency function values etc. However, when I apply the IFFT, I get nothing like what I expect. thanks for any help Vin