On Sep 30, 2010, at 11:16 PM, [email protected] wrote: > On Thu, Sep 30, 2010 at 09:23:08PM +0200, Robin Gareus wrote: > >> Back when I was introduced to FT in some Physics lecture I was happy >> that I was able to use it and completely forgot to check the history :) >> Probably related to why I favored experimental Physics over Theory. > > If you're still living in Paris, make sure to visit the 'Musée des > Arts et Métiers' one day. Quite a nice place for vintage experimental > physics. It's also the place where the final mad scene of Umberto Eco's > novel "Foucault's Pendulum" is situated. The pendulum itself used to be > there, but it's now at the Panthéon. >
I know the latter of course, but I've not yet been to the Musee des Arts et Metiers. Thanks for the hint, I'll definitely schedule a visit. There's so many hidden treasures here in plain sight one hardly knows where to start. >>> And I guess this is where the windowing comes in. Calculate the spectrum >>> of small pieces instead. >>> >> correct. >> >> Furthermore there are different kind of windows (here a window refers to >> a block of audio-samples) and windows can overlap. That's where it gets >> complicated. > > Even windows won't save you from apparent madness. Imagine a signal > consisting of all zero samples, except one every second which has > value 1. Such a signal contains all frequencies that are a multiple > of 1 Hz, up to half the sample frequency. Those frequencies are present > all the time. Now take a window of say half a second. If it includes a > pulse you get more or less the same spectrum again. If it doesn't, you > get nothing... even if the frequencies should be there :-) > to come back to the beginning: that's why paulstretch does allow to specify the window size. Cheers! robin > Ciao, > > -- > FA > > There are three of them, and Alleline. > _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
