Patent ID: 8676365

Claim:
A method for attenuating pre-echoes in a digital audio signal produced based on a transform coding, in the case where a reference signal arising from a temporal decoding and specific auxiliary information transmitted from a coder are not available, in which, upon decoding, for a current frame of this digital audio signal, the method comprising: defining a concatenated signal, based on at least a reconstructed signal of the current frame; dividing said concatenated signal into sub-blocks of samples of determined length; calculating a temporal envelope of the concatenated signal; detecting a transition of the temporal envelope to a high-energy zone; determining the sub-blocks of low energy preceding a sub-block in which a transition has been detected; and attenuating the determined sub-blocks, wherein the attenuation is performed utilizing an attenuation factor calculated for each of the determined sub-blocks, as a function of the temporal envelope of the concatenated signal and of the temporal envelope of the reconstructed signal of the previous frame; and calculating and storing the temporal envelope of the current frame after the step of attenuation in the determined sub-blocks.