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Problem 4.6. Consider two lowpass spectra, Xi(f) and Xo(f) in Figure 4.15 and sketch the energy spectrum of the complex envelope, G(f) Relx,(n) 0 A.I Figure 4.15 Two lowpass Fourier transforms. 2 cos(2xf) 2 cos(2rft) Figure 4.16 Sine and cosine generator.

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