The program uses fft and calculates the DCT.
This is relatively slower than the original DCT [Built-in], but this is open source DCT Implementation.
RFM (2021). DCT Implemetation using FFT. (https://www.mathworks.com/matlabcentral/fileexchange/13693-dct-implemetation-using-fft), MATLAB Central File Exchange. Retrieved .
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