On Mon, 09 Jul 2007 13:07:44 -0700, dspguy2@netscape.net wrote: (snipped)> >The halfway point between fft bins is used since it represents the >worst case loss. At the halfway point the power in adjacent FFT bins >is equal (for symmetric windows). If the frequency is lower then more >power goes to the lower FFT bin and less to the upper FFT bin. The >opposite happens when the frequency is increased. > >Cheers, >DavidHi, In case you're interested, there's a neat article, "FAST, ACCURATE FREQUENCY ESTIMATORS", by Eric Jacobsen and Peter Kootsookos in the "DSP Tips & Tricks" column, in the May 2007 issue of the IEEE Signal Processing magazine. That article addresses the subject of this thread. See Ya', [-Rick-]

# How much do Windowing procedures harm the signal?

Started by ●December 23, 2006

Reply by ●July 19, 20072007-07-19

Reply by ●July 19, 20072007-07-19

R.Lyons@_BOGUS_ieee.org (Rick Lyons) writes:> On Mon, 09 Jul 2007 13:07:44 -0700, dspguy2@netscape.net wrote: > > (snipped) >> >>The halfway point between fft bins is used since it represents the >>worst case loss. At the halfway point the power in adjacent FFT bins >>is equal (for symmetric windows). If the frequency is lower then more >>power goes to the lower FFT bin and less to the upper FFT bin. The >>opposite happens when the frequency is increased. >> >>Cheers, >>David > > Hi, > In case you're interested, > there's a neat article, "FAST, ACCURATE FREQUENCY > ESTIMATORS", by Eric Jacobsen and Peter Kootsookos > in the "DSP Tips & Tricks" column, in the May 2007 > issue of the IEEE Signal Processing magazine. > > That article addresses the subject of this thread. > > See Ya', > [-Rick-]There's also the landmark paper (seems no one quotes it anymore) that was published almost 30 years ago: @article{harris, title = "{On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform}", author = "{Harris, Frederic J.}", journal = "Proceedings of the IEEE", year = "1978", month = "January"} -- % Randy Yates % "And all that I can do %% Fuquay-Varina, NC % is say I'm sorry, %%% 919-577-9882 % that's the way it goes..." %%%% <yates@ieee.org> % Getting To The Point', *Balance of Power*, ELO http://home.earthlink.net/~yatescr

Reply by ●July 23, 20072007-07-23

On Thu, 19 Jul 2007 12:58:39 -0400, Randy Yates <yates@ieee.org> wrote: (snipped)> >There's also the landmark paper (seems no one quotes it >anymore) that was published almost 30 years ago: > >@article{harris, > title = "{On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform}", > author = "{Harris, Frederic J.}", > journal = "Proceedings of the IEEE", > year = "1978", > month = "January"} > >-- >% Randy Yates % "And all that I can doHi Randy, I've thought about that before. My guess, if I had to guess, would be that Cooley's & Tukey's original FFT paper is the MOST referenced signal processing paper. Then comes harris' "Windows" paper as the 2nd-most referenced paper. (I wonder if that's true.) See Ya', [-Rick-]

Reply by ●July 23, 20072007-07-23

Rick Lyons wrote: (snip)> I've thought about that before. My guess, > if I had to guess, would be that Cooley's & Tukey's > original FFT paper is the MOST referenced signal > processing paper. Then comes harris' "Windows" paper > as the 2nd-most referenced paper.I presume most here know that Gauss originated the FFT, though this wasn't discovered until a few years after the above mentioned paper was published. http://en.wikipedia.org/wiki/Cooley-Tukey_FFT_algorithm -- glen

Reply by ●July 24, 20072007-07-24

On Jul 19, 9:58 am, Randy Yates <ya...@ieee.org> wrote:>... > There's also the landmark paper (seems no one quotes it > anymore) that was published almost 30 years ago: > > @article{harris, > title = "{On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform}", > author = "{Harris, Frederic J.}", > journal = "Proceedings of the IEEE", > year = "1978", > month = "January"} > > -- > % Randy Yates % "And all that I can do > %% Fuquay-Varina, NC % is say I'm sorry, > %%% 919-577-9882 % that's the way it goes..." > %%%% <ya...@ieee.org> % Getting To The Point', *Balance of Power*, ELOhttp://home.earthlink.net/~yatescrAs posted earlier in this thread: Look for the original paper here: http://www.eng.vt.edu/me5714/textbook/windows.pdf It is still available there. Dale B. Dalrymple http://dbdimages.com