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Most LPC-based audio coders improve reproduction quality by using predictor coefficients to embody perceptual masking in noise spectral shaping. Since the predictor coefficients were originally derived to characterize sound production models, they cannot precisely describe the human ear's nonlinear responses to frequency and loudness. In this paper, we report on new approaches to exploiting the masking threshold in the design of a perceptual noise-weighting filter for excitation searches. Todoi:10.1109/89.486062 fatcat:czvzjbudlrav7ou3l4szgg7wta