12-11-2014
Many thanks to all for their help. Especially to Don for his kind and helpful explanation. One is never too old to learn (just turned 65) and this forum is a wonderful place to learn with helpful people.
This User Gave Thanks to gimley For This Post:
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LEARN ABOUT SUNOS
mlib_signalmelcepstral_s16_adp
mlib_SignalMelCepstral_S16_Adp(3MLIB) mediaLib Library Functions mlib_SignalMelCepstral_S16_Adp(3MLIB)
NAME
mlib_SignalMelCepstral_S16_Adp - perform cepstral analysis in mel frequency scale
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_SignalMelCepstral_S16_Adp(mlib_s16 *cepst, mlib_s32 *cscale, const mlib_s16 *signal, void *state);
DESCRIPTION
The mlib_SignalMelCepstral_S16_Adp() function performs cepstral analysis in mel frequency scale. The scaling factor of the output data
will be calculated based on the actual data.
The first two steps of mel scale cepstral analysis is the same as in general cepstral anaysis. After the logarithm of the spectrum magni-
tude is obtained, it is converted into mel frequency scale before the inverse Fourier transform.
+-----------+ +-----------+
| Linear | | Inverse |
... ------>| to |------->| Fourier |----->
X'(k) | Mel Scale | X''(m) | Transform | c(n)
+-----------+ +-----------+
where X'(k) is defined in linear frequency scale and X''(m) is defined in mel frequency scale.
The mel frequency scale is defined as following.
freq_mel = melmul * LOG10(1 + freq_linear / meldiv)
where freq_mel is the frequency in mel scale, freq_linear is the frequency in linear scale, melmul is the multiplying factor, muldiv is the
dividing factor.
Optionally, a bank of band pass filters in linear frequency scale can be used below the bank of band pass filters in mel frequency scale,
as shown below in linear frequency scale.
0 f1 f2 f3 fp fp+1 fp+2 fp+3 fp+q
|---|---|---| ... |---|----|-----| ... | ... -> freq
where fp = melbgn, fp+q = melend, p = nlinear, q = nmel; the filters number 1 to p are defined in linear frequency scale which have equal
bandwidth in linear frequency scale; the filters number p+1 to p+q are defined in mel frequency scale which have equal bandwidth in mel
frequency scale and increasing bandwidth in linear frequency scale.
See Digital Signal Processing by Alan V. Oppenheim and Ronald W. Schafer, Prentice Hall, 1974.
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.
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_SignalMelCepstralInit_S16(3MLIB), mlib_SignalMelCepstral_S16(3MLIB), mlib_SignalMelCepstralFree_S16(3MLIB), attributes(5)
SunOS 5.10 10 Nov 2004 mlib_SignalMelCepstral_S16_Adp(3MLIB)