Fourier Transform - Desmos
www.desmos.com › calculator › qpnz9celzfThis is the actual graph. If you add a wave at 5 beats per second and 3 beats per second, you get a weird graph and it would be hard to determine what waves were added. This is why you use the Fourier Transform. It also also normally expressed with complex numbers, but Desmos doesn't have them sadly.
Online calculator: The Discrete Fourier Transform Sandbox
planetcalc.com › 7543This calculator is an online sandbox for playing with Discrete Fourier Transform (DFT). It uses real DFT, the version of Discrete Fourier Transform, which uses real numbers to represent the input and output signals. DFT is part of Fourier analysis, a set of math techniques based on decomposing signals into sinusoids.