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If you know the reference input you might reverse engineer codec behaviour by trying all different codecs at all different bitrates until one matched. Or you might se telltale signs (rectangular patches in the frequency domain where energy is just above/bellw the threshold of being/not being transmitted) of a filterbank that is known to be used for one ...


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Run short term fourier transform with proper windowing and frame size Calculate power for each frame in each band. Calculate running mean and standard deviation (in each band) Compare mean and ratio of standard deviation to mean to thresholds. If in any band the mean is high enough (above noise floor) and the ratio is low enough (steady state) then you have ...


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