Graph Signal Processing, Fourier Transform, Graph Fourier Transform, Eigenvectors, Spectral Analysis.
Using this we can define a low-pass signal s as a signal for which the graph Fourier coefficients are zero for ​​ Ωk, ​ k > l, for some l, 0 ≤ l < N − 1. We can similarly define band- and high pass signals and filters. References [1] Ortega et al. (2018) Graph Signal Processing: Overview,