Let x[n] be a discrete-time signal obtained by sampling a continuous-time signal x c (t) with some
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Let x[n] be a discrete-time signal obtained by sampling a continuous-time signal xc(t) with some sampling period T so that x[n] = xc(nT). Assume xc(t) is bandlimited to 100 Hz, i.e, Xc(jΩ) = 0 for |Ω| ≥ 2π(100). We wish to estimate the continuous-time spectrum Xc(jΩ) by computing a 1024-point DFT of x[n], X[k]. What is the smallest value of T such that the equivalent frequency spacing between consecutive DFT samples X[k] corresponds to I Hz or less in continuous-time frequency?
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Discrete Time Signal Processing
ISBN: 978-0137549207
2nd Edition
Authors: Alan V. Oppenheim, Rolan W. Schafer
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