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Questions: Foundations of spectral analysis

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Questions: Foundations of spectral analysis

1. Explain the meaning of the Convolution theorem and the consequence for the subsequent application of filter operations.

2. How well can a discrete regular-spaced function be approximated by Fourier methods? What is the consequence for numerical methods based on the Fourier transform?

3. What are the different domains of application of the Fourier method and Chebyshev polynomials concerning the simulation of wave propagation?

4. What is Gibb’s phenomenon? Can it be avoided? What are the consequences for filtering and numerical methods based on the Fourier transform?

5. If “i” is the differential operator in the Fourier domain, what do you suggest should the differential operator on the time domain, in other words how would you calculate the time derivative entirely in the time domain to get exactly the same result?

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