Abstract: An extrema coding circuit comprising a differentiator and a noisy limiting-amplifier. The limiting-amplifier may comprise any one of a number of commercially available limiting-amplifier integrated circuits, for example, a limiting-amplifier front end of an FM IF amplifier and detector integrated circuit. The limiting-amplifier is operated so that the input voltages provided to it are in the order of magnitude of broadband noise generated internally by the limiting-amplifier stages. Accordingly, the limiting-amplifier stages encode the differentiated analog signal and the internally generated noise signal into an extrema coded signal, i.e., a signal wherein the times of occurrence of extrema are represented as transitions of a binary signal. Because of the high gain of the limiting-amplifier stages, these stages perform infinite clipping. The extrema coded signal contains information sufficient to enable substantial reproduction of the original analog signal therefrom.