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The signal to noise ratio, which plays such an important role in informationtheory, is shown to become pointless in digital communications where - symbolsare modulating carriers, which are solutions of linear differential equationswith polynomial coefficients, - demodulations is achieved thanks to newalgebraic estimation techniques. Operational calculus, differential algebra andnonstandard analysis are the main mathematical tools.

Critique du rapport signal \`a bruit en th\'eorie de l'information -- A critical appraisal of the signal to noise ratio in information theory