Encoding method (1) of an audio signal (x), the method comprising the steps of: estimating (110) a position of a transient signal component in the audio signal, in which the transient signal component gradually decreases after an initial increase; correspond (111, 112) a function of form in the transient signal component, function so that it has an initial behavior according to tn and a decrease behavior after the initial behavior, according to e-alfat, in which t is time yny alpha are form parameters that describe the form function; and include (15) the position and shape parameters in an audio stream (AS).
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