A novel algorithm to estimate the line spectral frequencies from LPC coefficients

A new method to estimate the line spectral frequencies (LSF's) with any desired accuracy is described. LSF's are estimated by locating the zeros of two polynomials derived from LPC inverse filter polynomial on the unit circle in z-plane. The computational load increases as the required accuracy increases. An important feature of algorithm is the ability of compromising the required accuracy and computational load. The method can also be applied to convert the higher order LPC coefficients to associated LSF's. The algorithm does not require a very high precision arithmetic and can be implemented using fixed-point digital signal processors.