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I'm currently working on my project related to implementing an speech enhancement algorithm on fpga which uses continuous wavelet with morel wavelet, how can i use efficient fft algorithm to calculate cwt and inverse cwt? i also came across this diagram from following paper https://aip.scitation.org/doi/citedby/10.1063/1.1147636which explains how to use fft to perform cwt but does not mentions how to calculate inverse cwt. Does the cross sign represents a complex multiplication? enter image description here

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