mlib_SignalLPC2Cepstral_F32(3MLIB)			    mediaLib Library Functions				mlib_SignalLPC2Cepstral_F32(3MLIB)

NAME

       mlib_SignalLPC2Cepstral_F32 - convert linear prediction coefficients to cepstral coefficients

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_SignalLPC2Cepstral_F32(mlib_f32 *cepst,
	    const mlib_f32 *lpc, mlib_f32 gain, mlib_s32 length,
	    mlib_s32 order);

DESCRIPTION

       The mlib_SignalLPC2Cepstral_F32() function converts linear prediction coefficients to cepstral coefficients.

       The cepstral coefficients are the coefficients of the Fourier transform representation of the log magnitude spectrum.

       The LPC cepstral coefficients can be derived recursively from the LPC coefficients as following.

	 c(0) = log(G)

		       m-1  k
	 c(m) = a(m) + SUM --- * c(k) * a(m-k), 1 <= m <= M
		       k=1  m

		m-1  k
	 c(m) = SUM --- * c(k) * a(m-k), m > M
		k=1  m

       See Fundamentals of Speech Recognition by Lawrence Rabiner and Biing-Hwang Juang, Prentice Hall, 1993.

PARAMETERS

       The function takes the following arguments:

       cepst	 The cepstral coefficients.

       lpc	 The linear prediction coefficients.

       gain	 The gain of the LPC model.

       length	 The length of the cepstral 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_SignalLPC2Cepstral_S16(3MLIB), mlib_SignalLPC2Cepstral_S16_Adp(3MLIB), mlib_SignalLPC2Cepstral_F32(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007					mlib_SignalLPC2Cepstral_F32(3MLIB)