LSF/LSP to LPC Conversion
Convert line spectral frequencies or line spectral pairs to linear prediction coefficients
Library
Estimation / Linear Prediction
dsplp
Description
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 lsf2poly function.
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.
Parameters
- Input
Specifies whether to convert
LSP in range (-1 1),LSF in range (0 pi), orLSF normalized in range (0 0.5)to linear prediction coefficients (LPCs).
Supported Data Types
Double-precision floating point
Single-precision floating point
References
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.
See Also
| LPC to LSF/LSP Conversion | DSP System Toolbox |
| LPC to/from RC | DSP System Toolbox |
| LPC/RC to Autocorrelation | DSP System Toolbox |
lsf2poly | Signal Processing Toolbox |