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 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...
 Rotating Phasors- Negative Frequencies This interactive phasor page allows you to control the values of a rotating phasor and see a visualization of each change that is done. You can control: one, pos/neg, two, beats, delta, sawtooth, square, triangle, time, zoom, plus you can put into five different values: Frequency (rel, HZ, mHZ), Amplitude (raw, rel), and Phases (Deg, Rad, unitrad). http://ptolemy.eecs.berkeley.edu/eecs20/week10/negativefreqs...
 Listen to Fourier series This webpage from Johns Hopkins University provides an introduction to Fourier series. The site describes Fourier series in the context of audio tones, and interactive applets that illustrate the concepts involved are also included. Also, at the bottom of the page, you can listen to different types of white noise. http://pages.jh.edu/~signals/listen-new/listen-newindex.htm
 The Fourier Transform and its Applications This collection of video guides, authored by Brad G. Osgood of Stanford University, states the goals for the course are to gain a facility with using the Fourier transform, both specific techniques and general principles, and learning to recognize when, why, and how it is used. Together with a great variety, the subject also has a great coherence, and the hope is students come to appreciate both. http://academicearth.org/mathematics/
 Computational Science and Engineering I This course, presented by MIT and taught by professor Gilbert Strang, provides a review of linear algebra. Topics include differential equations of equilibrium; Laplace's equation and potential flow; boundary-value problems; minimum principles and calculus of variations; Fourier series; discrete Fourier transform; convolution; and applications. MIT presents OpenCourseWare as free educational... http://ocw.mit.edu/courses/mathematics/18-085-computational-...
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