Method for the adaptive filtering of a transformed signal in sub-bands and corresponding filtering method

A system for filtering a digital source signal, the system comprising:

• means for transforming the digital source signal from a temporal domain signal into at least two frequency domain sub-bands;
• means for defining an overall filtering profile corresponding to a filtering operation designed to filter the digital source signal;
• means for determining a set of neighboring partial filtering profiles based upon the overall filtering profile, each partial filtering profile corresponding to a respective frequency sub-band, at least one partial filtering profile being a function of at least one other of the neighboring partial filtering profiles;
• means for filtering each frequency sub-band based upon a corresponding partial filtering profile, at least two filtered frequency sub-bands having aliasing terms based upon the corresponding partial filtering profiles;
• means for transforming filtered frequency sub-bands from the frequency domain into filtered temporal domain signals;
• and
• means for reconstructing the filtered temporal domain signals to form an output signal, the output signal corresponding substantially to a filtered digital source signal, wherein reconstructing the filtered temporal domain signals to form the output signal includes at least partially compensating aliasing terms existing in at least one filtered frequency sub-band based upon the at least one partial filtering profile with aliasing terms existing in at least one other filtered frequency sub-band based upon at least one other neighboring partial filtering profile.