Convert line spectral frequencies to prediction filter coefficients
a = lsf2poly(lsf)
a = lsf2poly(lsf) returns a vector,
a, containing the prediction filter coefficients from the vector,
lsf, of line spectral frequencies. If lsf is a
matrix of size M × N with separate
channels of line spectral frequencies in each column, the returned a
matrix has the resulting prediction filter coefficients as its rows and is of size
N × (M + 1).
[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.