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I get the math and the explanations and all that but what I don't get is how do you express a complex sound signal as a function of f? Is it a long array with t
by Phenomenit 4y ago
I get the math and the explanations and all that but what I don't get is how do you express a complex sound signal as a function of f? Is it a long array with t and the amplitude?
- sfpotter 4y agoYes.
- sizzzzlerz 4y agoIn reality, you can't. Since the fourier transform was designed for a continuous signal, it needs some modifications to tailor it to work in a digital world where, instead of a continuous signal, you periodically sample the waveform at regular intervals and use the discrete fourier transform (DFT) or its more efficient little brother, the fast fourier transform (FFT). Both these work off N samples of the waveform at a time.
- dsego 4y agoAfaik, in digital sound recordings it's basically an array of sampled amplitudes. And you need to know the sampling rate in advance, eg 44100 samples in a second. This is I think called PCM https://en.wikipedia.org/wiki/Pulse-code_modulation https://en.wikipedia.org/wiki/Pulse-code_modulation