Patent ID: 8467893

Claim:
A method of objective perceptual evaluation of audio quality based on at least one model output variable comprising: bandwidth compensating the at least one model output variable for differences in bandwidth between an original signal and a processed signal by applying a function to the at least one model output variable, the function being a linear combination of the at least one model output variable and a function of the difference between a measure of the bandwidth of the original signal and a measure of the bandwidth of the processed signal; wherein the coefficients of the linear combination are functions of the difference; and wherein the bandwidth compensating the at least one model output variable includes bandwidth compensating at least one of the model output variables F i of the Perceptual Evaluation of Audio Quality (PEAQ) standard, to obtain the corresponding bandwidth compensated model output variable F* i where: F 1 =WinModDiff1; F 2 =AvgModDiff1; F 3 =AvgModDiff2; F 4 =TotalNMR; F 5 =RelDistFrames; F 6 =MFPD; F 7 =ADB; F 8 =EHS; and F 9 =RmsNoiseLoud; and wherein the bandwidth compensation is performed in accordance with: F i * = ( 1 - α ) ⁢ F i + α ⁢ ⁢ Δ ⁢ ⁢ BW where Δ ⁢ ⁢ BW =  BandwidthRef - BandwidthTest  BandwidthRef where ∥.∥ denotes the absolute value; BandwidthRef is the measure of the bandwidth of the original signal; BandwidthTest is the measure of the bandwidth of the processed signal; α is a compressing function of ΔBW; and F* i denotes the bandwidth compensated version of F i .