1. A method for discriminating and attenuating the echoes of a digital audio signal generated from a transform encoding, which generates echoes, the method including at least in the decoding, for each current frame of this digital audio signal, the following steps: discriminating a low-energy zone preceding a transition to a high-energy zone; defining a false-alarm zone corresponding to the non-discriminated zones of the current frame; determining an initial processing of the echoes with attenuation gain values of the current frame; attenuating the echoes according to the initial processing of the echoes in said low-energy discriminated zones of the current frame; inhibiting the attenuation of the echoes in the initial processing in the false-alarm zone.