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 DTFT Properties This website includes a Java applet that displays the effect that various operations on an N-periodic, discrete-time signal (e.g. time shift, time scale, filtering) have on the signal and its spectra. Sketch the signal or magnitude and phase spectra with the mouse, and then select the operation. http://pages.jh.edu/~signals/dtftprops/indexDTFTprops.htm
 Phasor Phactory For the phasor phanatic, created Hsi Chen Lee of Johns Hopkins University, an applet that offers 4 ways to generate and observe continuous-time harmonic phasor sums and the corresponding fourier series. http://pages.jh.edu/~signals/phasorapplet2/phasorappletindex...
 Fourier Series Approximation This site includes a Java applet that displays Fourier series approximations and corresponding magnitude and phase spectra of a periodic continuous-time signal. Select from provided signals, or draw a signal with the mouse. http://pages.jh.edu/~signals/fourier2/index.html
 Fourier Transform I Created by Lang Moore for the Connected Curriculum Project, the purpose of this module is to study the Fourier transform and use it to describe solutions of the heat equation on an infinite rod. This is one of a much larger set of learning modules hosted by Duke University. https://www.math.duke.edu/education/ccp/materials/engin/ftra...
 Harmonic Phasors and Fourier Series This resource from Johns Hopkins University has audio and interactive components. Various forms of the Fourier series description for periodic signals are based on alternate ways of writing a cosine signal. This resource goes over Phasors, Phasor Sums, Harmonic Phasor Sums, Gibbs Effect, Windowing, Fejer Window, and Hamming Window. http://pages.jh.edu/~signals/phasorlecture2/indexphasorlect2...
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