Perceptual filter comparisons for wideband and FM bandwidth audio coders

High quality music coders commonly use auditory masked thresholds to account for the characteristics of the human ear. Perceptual lters (based upon linear signal prediction used in speech coders) are compared to lters using masked thresholds. Using listening tests, we have noticed that the second method does not provide better perceptual results. A natural way of proceeding would be to de ne a better psychoacoustical model. However, an intermediate method is presented here which allows additional degrees of freedom in a standard technique. The roots of the whitening lter are treated individually.