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Article #1661Re: Check of an FFT routine...
From: Dana C. Massie
Date: Tue, 09 Apr 1991 17:45
Date: Tue, 09 Apr 1991 17:45
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1446 bytes
In article <SRF.91Apr4100830@claudius.juliet.ll.mit.edu> srf@claudius.juliet.ll.mit.edu ( Steve Feinstein) writes: > >Your values are wrong and there aren't enough of them, either. >You should be generating at least N FFT points for an N-point >array. The example you've posted is a 16-pt FFT on 32-pt >data. Here is what MATLAB generated: > > -0.0023 -pi ... > Steve Feinstein I got the same results with matlab that Steve got. When i wrote an FFT i found it *much* easier to use simple test signals like a sine wave to test the fft. I would strongly addvise using a simple impulse in bin 0 of the input, then switch to an impulse in bin 1, etc. and check the output of each case. This is a very effective method. Also, once this is working, put an impulse in bin 0 and bin 1 - this will test superposition. good luck! dmassie@well.sf.ca.us
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!well!dmassie From: dmassie@well.sf.ca.us (Dana C. Massie) Newsgroups: comp.dsp Subject: Re: Check of an FFT routine... Summary: I agree - but use a simpler test case... Keywords: fft test signal Message-ID: <24112@well.sf.ca.us> Date: 9 Apr 91 17:45:14 GMT References: <1991Apr4.004750.15969@en.ecn.purdue.edu> <SRF.91Apr4100830@claudius.juliet.ll.mit.edu> Distribution: usa Organization: E-mu Systems, c/o Whole Earth 'Lectronic Link, Sausalito, CA Lines: 22