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Jean Baptiste Joseph Fourier (1768-1830)

Jean Baptiste Joseph Fourier (1768-1830). had crazy idea (1807): Any periodic function can be rewritten as a weighted sum of sines and cosines of different frequencies. Don’t believe it? Neither did Lagrange, Laplace, Poisson and other big wigs Not translated into English until 1878!

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Jean Baptiste Joseph Fourier (1768-1830)

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  1. Jean Baptiste Joseph Fourier (1768-1830) • had crazy idea (1807): • Any periodic function can be rewritten as a weighted sum of sines and cosines of different frequencies. • Don’t believe it? • Neither did Lagrange, Laplace, Poisson and other big wigs • Not translated into English until 1878! • But it’s true! • called Fourier Series

  2. Frequency Spectra = + =

  3. Frequency Spectra =

  4. Frequency Spectra

  5. Einstein

  6. Campbell-Robson

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