Process for reducing the pre-echoes or post-echoes affecting audio recordings

Process for eliminating, from a first segment of a digitized audio signal, an attenuated replica of a portion of a second segment of the digitized audio signal, said portion of the second segment exhibiting a time shift with respect to said replica, said process comprising the steps of:

• determining a value representative of an attenuation factor between said portion of the second segment and said replica for each of a plurality of values of a frequency index k;
• for each of a plurality of values of an integer p, calculating respective short-term discrete Fourier transforms X(p,k) and X.sub..tau. (p,k) of the audio signal shifted by pR samples and of the audio signal shifted by pR+.tau. samples, R denoting a predetermined integer at most equal to a length T of said short-term discrete Fourier transforms and .tau.denoting said time shift expressed as a number of samples, calculating a corrected signal in the frequency domain by nonlinear transformation of the short-term Fourier transform X(p,k) taking account, for each of said plurality of values of the frequency index k, of the value representative of the attenuation factor relating to said replica and of the short-term Fourier transform X.tau.(p,k), and calculating a short-term component of a corrected signal in the time domain by short-term inverse Fourier transform of the corrected signal in the frequency domain;
• and
• forming the corrected signal in the time domain by weighted summation of the short-term components thereof.