Convert line spectral frequencies or line spectral pairs to linear prediction coefficients
Estimation / Linear Prediction
The LSF/LSP to LPC Conversion block takes a vector or matrix
of line spectral pairs (LSPs) or line spectral frequencies (LSFs)
and converts it to a vector or matrix of linear prediction polynomial
coefficients (LPCs). When converting LSFs to LPCs, the block outputs
match those of the
The block input can be an N-by-M matrix or an unoriented vector. Each column of the matrix is treated as a channel. When the input is an unoriented vector, the input is treated as one channel. Each input channel must be in the same format, which you specify in the Input parameter:
LSF in range (0 pi) —
Vector of LSF values between 0 and π radians
in increasing order. Do not include the guaranteed LSF values, 0 and π.
LSF normalized in range (0 0.5) —
Vector of normalized LSF values in increasing order, (compute by dividing
the LSF values between 0 and π radians by
2π). Do not include the guaranteed normalized
LSF values, 0 and 0.5.
LSP in range (-1 1) —
Vector of LSP values in decreasing order, equal to the cosine of the
LSF values between 0 and π radians. Do not
include the guaranteed LSP values, -1 and 1.
Specifies whether to convert
LSP in range (-1 1),
in range (0 pi), or
LSF normalized in range
(0 0.5) to linear prediction coefficients (LPCs).
Double-precision floating point
Single-precision floating point
Kabal, P. and Ramachandran, R. "The Computation of Line Spectral Frequencies Using Chebyshev Polynomials." IEEE Transactions on Acoustics, Speech, and Signal Processing, Vol. ASSP-34 No. 6, December 1986. pp. 1419-1426.