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Reference.org
Multidimensional spectral estimation
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<p>Multidimension spectral estimation is a generalization of <a href="/facts/Spectral_estimation/JefWFBsx">spectral estimation</a>, normally formulated for one-dimensional <a href="/facts/Signal/41YqUJ8c">signals</a>, to multidimensional signals or <a href="/facts/Multivariate_data/tDuNcWrL">multivariate data</a>, such as <a href="/facts/Wave_vector/Jk8wUEft">wave vectors</a>. </p>