METHOD OF CONVERTING LINE SPECTRAL FREQUENCIES BACK TO LINEAR PREDICTION COEFFICIENTS

摘要

A method for the conversion of LSF to LPC coefficients (Line Spectral Frequencies to Linear Prediction Coefficients) to avoid excessive growth of intermediate coefficients during calculation of polynomial products. The symmetric and antisymmetric polynomials P(z) and Q(z) are ordered in series which are reduced two by two until obtaining two polynomials which are multiplied.