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Transform domain signal processing might be very time consuming unless efficient computational
algorithms are used. In this chapter, we describe application of Fast Fourier and Fast Cosine Transform to
computing signal convolution and Scaled and Rotated Discrete Fourier Transforms and, in addition, recursive
algorithms for computing local signal DFT and DCT spectra in sliding window.
Dept. of Physical Electronics, School of Electrical Engineering, Tel Aviv University, Tel Aviv 69978, Israel.