poly2lsf

Convert prediction filter coefficients to line spectral frequencies

Syntax

lsf = poly2lsf(a)

lsf = poly2lsf(a) returns a vector, lsf, of line spectral frequencies from a vector, a, of prediction filter coefficients.

Given a vector, a, of prediction filter coefficients, generate the corresponding line spectral frequencies.

a = [1.0000  0.6149  0.9899  0.0000  0.0031 -0.0082];
lsf = poly2lsf(a)

[1] Deller, John R., John G. Proakis, and John H. L. Hansen. Discrete-Time Processing of Speech Signals. New York: Macmillan, 1993.

[2] Rabiner, Lawrence R., and Ronald W. Schafer. Digital Processing of Speech Signals. Englewood Cliffs, NJ: Prentice-Hall, 1978.

Usage notes and limitations:

See Variable-Sizing Restrictions for Code Generation of Toolbox Functions (MATLAB Coder).
Poorly conditioned prediction polynomials generate line spectral frequencies that do not always match MATLAB^®.