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mlib_signallpc2lsp_s16(3mlib) [sunos man page]

mlib_SignalLPC2LSP_S16(3MLIB)				    mediaLib Library Functions				     mlib_SignalLPC2LSP_S16(3MLIB)

NAME
mlib_SignalLPC2LSP_S16 - convert linear prediction coefficients to line spectral pair coefficients SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_SignalLPC2LSP_S16(mlib_s16 *lsp, const mlib_s16 *lpc, mlib_s32 lscale, mlib_s32 order); DESCRIPTION
The mlib_SignalLPC2LSP_S16() 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. PARAMETERS
The function takes the following arguments: lsp The line spectral pair coefficients in Q15 format. lpc The linear prediction coefficients. lscale The scaling factor of the linear prediction coefficients, where actual_data = input_data * 2**(-scaling_factor). order The order of the linear prediction filter. RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mlib_SignalLSP2LPC_S16(3MLIB), attributes(5) SunOS 5.10 10 Nov 2004 mlib_SignalLPC2LSP_S16(3MLIB)

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mlib_SignalLSP2LPC_F32(3MLIB)				    mediaLib Library Functions				     mlib_SignalLSP2LPC_F32(3MLIB)

NAME
mlib_SignalLSP2LPC_F32 - convert line spectral pair coefficients to linear prediction coefficients SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_SignalLSP2LPC_F32(mlib_f32 *lpc, const mlib_f32 *lsp, mlib_s32 order); DESCRIPTION
The mlib_SignalLSP2LPC_F32() function converts line spectral pair coefficients to linear prediction 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. PARAMETERS
The function takes the following arguments: lpc The linear prediction coefficients. lsp The line spectral pair coefficients. order The order of the linear prediction filter. RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mlib_SignalLPC2LSP_F32(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_SignalLSP2LPC_F32(3MLIB)
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