Patent ID: 8260620

Claim:
A perceptual weighting device for coding/decoding of an audio signal in a given frequency band, said coding/decoding being effected in a plurality of adjacent sub-bands in said given frequency band, wherein said device includes, in at least one sub-band of the plurality of adjacent sub-bands, a perceptually weighted filter with gain compensation, said perceptually weighted filter with gain compensation being in the form of fac*Â(z/γ 1 )/Â(z/γ 2 ) where Â(z) represents a linear prediction filter, with 0≦γ 2 ≦1 and 0≦γ 1 ≦1, and fac represents a gain compensation factor which is a function of coefficients of said linear prediction filter Â(z), the gain compensation being adapted to realize spectral continuity between an output signal of said perceptually weighted filter with gain compensation and signals in sub-bands adjacent to said at least one sub-band, said gain compensation factor fac being given by: fac =  ∑ i = 0 p ⁢ ⁢ ( - γ 2 ) i ⁢ a ^ i ∑ i = 0 p ⁢ ⁢ ( - γ 1 ) i ⁢ a ^ i  where â i are the coefficients of said linear prediction filter Â(z)=â 0 +â 1 z −1 +â 2 z −2 + . . . +â p z −p , and p is the order of said linear prediction filter.