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mlib_signalcepstralfree_s16(3mlib) [opensolaris man page]

mlib_SignalCepstralFree_S16(3MLIB)			    mediaLib Library Functions				mlib_SignalCepstralFree_S16(3MLIB)

NAME
mlib_SignalCepstralFree_S16, mlib_SignalCepstralFree_F32 - clean up for cepstral analysis SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> void mlib_SignalCepstralFree_S16(void *state); void mlib_SignalCepstralFree_F32(void *state); DESCRIPTION
Each of these functions frees the internal state structure for cepstral analysis. This function cleans up the internal state structure and releases all memory buffers. PARAMETERS
Each of the functions takes the following arguments: state Pointer to the internal state structure. RETURN VALUES
None. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mlib_SignalCepstral_S16(3MLIB), mlib_SignalCepstral_F32(3MLIB), mlib_SignalCepstral_S16_Adp(3MLIB), mlib_SignalCepstralInit_S16(3MLIB), mlib_SignalCepstralInit_F32(3MLIB), attributes(5) SunOS 5.11 2 Mar 2007 mlib_SignalCepstralFree_S16(3MLIB)

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mlib_SignalCepstral_S16_Adp(3MLIB)			    mediaLib Library Functions				mlib_SignalCepstral_S16_Adp(3MLIB)

NAME
mlib_SignalCepstral_S16_Adp - perform cepstral analysis SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ] #include <mlib.h> mlib_status mlib_SignalCepstral_S16_Adp(mlib_s16 *cepst, mlib_s32 *cscale, const mlib_s16 *signal, void *state); DESCRIPTION
The mlib_SignalCepstral_S16_Adp() function performs cepstral analysis. The scaling factor of the output data will be calculated based on the actual data. The basic operations to compute the cepstrum is shown below. +-----------+ +--------+ +-----------+ | Fourier | | | | Inverse | ----->| |----->| log|*| |------>| Fourier |-----> x(n) | Transform | X(k) | | X'(k) | Transform | c(n) +-----------+ +--------+ +-----------+ where x(n) is the input signal and c(n) is its cepstrum. In mathematics, they are N-1 2*PI*k*n X(k) = SUM x(n) * exp(-j*----------) n=0 N X'(k) = log|X(k)| 1 N-1 2*PI*k*n c(n) = --- SUM X'(k) * exp(j*----------) N n=0 N Since X'(k) is real and even (symmetric), i.e. X'(k) = X'(N - k) the c(n) is real and the equation becomes Cosine transform. 1 N-1 2*PI*k*n c(n) = --- SUM X'(k) * cos(----------) N n=0 N The cepstral coefficients in LPC is a special case of the above. See Digital Signal Processing by Alan V. Oppenheim and Ronald W. Schafer, Prentice Hall, 1974. See Fundamentals of Speech Recognition by Lawrence Rabinerand Biing-Hwang Juang, Prentice Hall, 1993. PARAMETERS
The function takes the following arguments: cepst The cepstral coefficients. cscale The scaling factor of cepstral coefficients, where actual_data = output_data * 2**(-scaling_factor). signal The input signal vector, the signal samples are in Q15 format. state Pointer to the internal state structure. 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_SignalCepstralInit_S16(3MLIB), mlib_SignalCepstral_S16(3MLIB), mlib_SignalCepstralFree_S16(3MLIB), attributes(5) SunOS 5.10 10 Nov 2004 mlib_SignalCepstral_S16_Adp(3MLIB)
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