Isn't the question about the algorithm used?The simulation set-up of Hans can read in a .dsf file and calculate an FFT using LTSpice, if I understand it correctly.

To calculate a DFT directly from a DSD stream, wouldn't that require cross-correlation of sine and cosine waves with the DSD stream of 1-bit samples? It would presumably be a form of averaging, seems like anyway. (where a 1 is taken as a +1 sample, and a 0 is taken as a -1 sample, or something equivalent to that?)

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