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- W1891428917 abstract "A vector‐valued signal in N dimensions is a signal whose value at any time instant is an N ‐dimensional vector, that is, an element of . The sum of an arbitrary number of such signals of the same frequency is shown to trace an ellipse in N ‐dimensional space, that is, to be confined to a plane . The parameters of the ellipse (major and minor axes, represented by N ‐dimensional vectors; and phase) are obtained algebraically in terms of the directions of oscillation of the constituent signals, and their phases. It is shown that the major axis of the ellipse can always be determined algebraically. That is, a vector, whose value can be computed algebraically (without decisions or comparisons of magnitude) from parameters of the constituent signals, always represents the major axis of the ellipse. The ramifications of this result for the processing and Fourier analysis of signals with vector values or samples are discussed, with reference to the definition of Fourier transforms, particularly discrete Fourier transforms, such as have been defined in several hypercomplex algebras, including Clifford algebras. The treatment in the paper, however, is entirely based on signals with values in . Although the paper is written in terms of vector signals (which are taken to include images and volumetric images), the analysis clearly also applies to a superposition of simple harmonic motions in N dimensions. Copyright © 2016 John Wiley & Sons, Ltd." @default.
- W1891428917 created "2016-06-24" @default.
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- W1891428917 date "2016-06-16" @default.
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- W1891428917 title "On harmonic analysis of vector‐valued signals" @default.
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- W1891428917 doi "https://doi.org/10.1002/mma.3938" @default.
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