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raw_symbols[160] = list of the audio snipets of all the symbols sounds as raw recorded.
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filtered_symbol[7] = for ONE given symbol (among the 160), this contains the 7 arrays reprensenting the 7 filtered audio snippets, 1 per frequency.
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freq_cosine[7] = the list of the 7 arrays representing the 7 (clean) raised cosines frequencies that may (or not) compose the sent signal.
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correlated_symbol[7] = list of 7 arrays corresponding to the 7 cross-correlations of the filtered audio snippets of a symbol, with the 7 clean raised-cosines.
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amplitude_symbol[7] = list of 7 floats reprensenting the average amplitude of the 7 cross-correlations (if large, then the very frequency was sent, else it wasn't).
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decoded_symbol[7] = list of the 7 bits (representing 1 symbol) that were sent during the symbol duration, going from the lowest freq to the highest.
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