Query: mlib_signallpc2lsp_f32
OS: opensolaris
Section: 3mlib
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mlib_SignalLPC2LSP_F32(3MLIB) mediaLib Library Functions mlib_SignalLPC2LSP_F32(3MLIB)NAMEmlib_SignalLPC2LSP_F32 - convert linear prediction coefficients to line spectral pair coefficientsSYNOPSIScc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_SignalLPC2LSP_F32(mlib_f32 *lsp, const mlib_f32 *lpc, mlib_s32 order);DESCRIPTIONThe mlib_SignalLPC2LSP_F32() function converts linear prediction coefficients to line spectral pair coefficients. The line spectral pair (LPS) coefficients are defined as the roots of the following two polynomials: -(M+1) -1 P(z) = A(z) + z * A(z ) -(M+1) -1 Q(z) = A(z) - z * A(z ) where A(z) is the inverse filter M -i A(z) = 1- SUM a(i) * z i=1 Note that since P(z) is symmetric and Q(z) is antisymmetric all roots of these polynomials are on the unit circle and they alternate each other. P(z) has a root at z = -1 (w = PI) and Q(z) has a root at z = 1 (w = 0). The line spectral frequency (LPF) are the angular frequency of the line spectral pair (LPS) coefficients. q = cos(w) where q is the LPS and w is the LPF. See Fundamentals of Speech Recognition by Lawrence Rabiner and Biing-Hwang Juang, Prentice Hall, 1993.PARAMETERSThe function takes the following arguments: lsp The line spectral pair coefficients. lpc The linear prediction coefficients. order The order of the linear prediction filter.RETURN VALUESThe function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.ATTRIBUTESSee attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+SEE ALSOmlib_SignalLSP2LPC_F32(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_SignalLPC2LSP_F32(3MLIB)