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The appendices provide a summary of notation, continuous-time Fourier theorems, a primer on statistical signal processing (at a deeper level than in Chapter 6), more about the Gaussian function, frequency warping (a preprocessing technique that can greatly enhance the quality of an audio filter design), and programming examples in the matlab language (including software for spectrogram computation and inversion). Finally, an historical summary of spectral modeling from a ``computer music point of view'' appears in Appendix G.

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