poly2lsf

Convert prediction filter coefficients to line spectral frequencies

Syntax

lsf = poly2lsf(a)

Description

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

Examples

Generate Line Spectral Frequencies

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)

lsf = 5×1

    0.7842
    1.5605
    1.8776
    1.8984
    2.3593

Input Arguments

a — Prediction filter coefficients

vector

Prediction filter coefficients, specified as a vector.

Data Types: single | double

Output Arguments

lsf — Line spectral frequencies

column vector

Line spectral frequencies, returned as a column vector.

References

[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.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

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^®.

Version History

Introduced before R2006a