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Before I dropped the plank there was nothing,
... breaking something down into component parts that can be put together to create the object but that does not mean that the parts have any relationship to the real components that made the object in the first place.For example if I mage a loud bang by dropping a plank on a hard floor in a quiet room and record the waveform and include say a second of silence before the bang and a few seconds after the bang as the sound dies away I can break this noise down into fourier components using continuous sine waves and it will be recreated with as much accuracy as I desire but all the sine waves will continue for the entire period of the window over which I have decided to reproduce the recording ...
Perfectly true, of course.However the whole concept of Fourier transforms assumes you're working with a periodic or repetitive waveform (like a continuous tone, trumpet sound, violin etc) - not a one-off crash.
What are they? What are they used for?...they seem to pop up a lot in physics.ww.thenakedscientists.com/forum/index.php?topic=11068.0 .
Started by guest49538Board Physics, Astronomy & Cosmology