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(a) Combined frequency response of a four-scale wavelet filter bank obtained by our optimization procedure. a = {4, 2, 1, 0.5}. Invertibility is imposed from degree 10 to 89. Combined frequency response cutoff is set to Lc = 150. (b) Plot of ringing versus cutoff frequency Lc. (a) Combined frequency response, Lc = 150. (b) Ringing versus Lc.
