Rectangular Pulse and Its Fourier Transform - Wolfram Demonstrations Project
I wanted to calculate the Fourier transform of sin(at) and ended up that it's indeterminate. Wolfram Alpha says tho that the answer has to do with the Dirac delta function. Where did
FFT (Fast Fourier Transform) Waveform Analysis
Fourier Series Calculator - Fourier Series on line - Mathstools
Fourier Transform Calculator | The Best Fourier Series Calculator
Fourier Transform of Basic Signals (Unit Step Signal) - YouTube