Unformatted text preview: Fourier series, as a sum of complex sinusoids are basically sums of sines and cosines. With Gibbs phenomenon in mind, does a perfect square wave exist? No. Nothing can change, say, voltage from 0 to 5V in 0 second. It is physically impossible. Think about this. What is voltage? Due to electrons? How does voltage change? Due to electron or charge movement? Does electron have finite speed? Below speed of light? If a voltage can change instantaneously, does it mean that electron has infinite speed?...
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 Fall '07
 Prof.C.C.Ko
 Fourier Series, Light, Square wave

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