Picture, if you will, a calico
Well it's not actually caturday in this part of the world since "this" is the Sunshine state so enjoy my in-law's sweet pooch.
Nevermind the sad looking eyes of Sabrina, a beautiful bag-of-beagle.
The Fourier Transform, or more usefully the Discrete Fourier Transform, is a technique to convert a periodically-sampled series of the input into its frequency components. When adding the power component, the resulting series can be displayed as a Spectrogram or perhaps passed down the line to extract clock and symbol data to digital data stream as in the "dem"odulator element of a modem.
Do you remember the feeling of exhiliration, behind the wheel of your new automobile, drivers license fresh off the press, and a full tank of gas? Maybe it was the family car or a klunker. Flying feels like that, but better, and it keeps feeling fresh and new.
I use Freebsd on the desktop and on the servers. But like millions of others I run bookeeping and a FAX program on an XP box and the installation media is missing (these are licensed copies of software BTW).