#include <sent/stddefs.h>
#include <sent/mfcc.h>
Go to the source code of this file.
Functions | |
static void | make_costbl_hamming (MFCCWork *w, int framesize) |
Generate table for hamming window. | |
static void | make_fft_table (MFCCWork *w, int n) |
Build tables for FFT. | |
static void | make_costbl_makemfcc (MFCCWork *w, int fbank_num, int mfcc_dim) |
Generate table for DCT operation to make mfcc from fbank. | |
static void | make_sintbl_wcep (MFCCWork *w, int lifter, int mfcc_dim) |
Generate table for weighing cepstrum. | |
float | Mel (int k, float fres) |
Return mel-frequency. | |
static boolean | VTLN_recreate_fbank_cf (float *cf, Value *para, float mlo, float mhi, int maxChan) |
Create fbank center frequency for VTLN. | |
boolean | InitFBank (MFCCWork *w, Value *para) |
Build filterbank information and generate tables for MFCC comptutation. | |
void | FreeFBank (FBankInfo *fb) |
Free FBankInfo. | |
void | ZMeanFrame (float *wave, int framesize) |
Remove DC offset per frame. | |
float | CalcLogRawE (float *wave, int framesize) |
Calculate Log Raw Energy. | |
void | PreEmphasise (float *wave, int framesize, float preEmph) |
Apply pre-emphasis filter. | |
void | Hamming (float *wave, int framesize, MFCCWork *w) |
Apply hamming window. | |
void | FFT (float *xRe, float *xIm, int p, MFCCWork *w) |
Apply FFT. | |
void | MakeFBank (float *wave, MFCCWork *w, Value *para) |
Convert wave -> (spectral subtraction) -> mel-frequency filterbank. | |
float | CalcC0 (MFCCWork *w, Value *para) |
Calculate 0'th cepstral coefficient. | |
void | MakeMFCC (float *mfcc, Value *para, MFCCWork *w) |
Apply DCT to filterbank to make MFCC. | |
void | WeightCepstrum (float *mfcc, Value *para, MFCCWork *w) |
Re-scale cepstral coefficients. | |
MFCCWork * | WMP_work_new (Value *para) |
Setup work area for parameters, values, buffers, tables to compute MFCC vectors, with a given parameter configurations. | |
void | WMP_calc (MFCCWork *w, float *mfcc, Value *para) |
Calculate MFCC and log energy for one frame. | |
void | WMP_free (MFCCWork *w) |
Free all work area for MFCC computation. |
These are core functions to compute MFCC vectors from windowed speech data.
Definition in file mfcc-core.c.
static void make_costbl_hamming | ( | MFCCWork * | w, | |
int | framesize | |||
) | [static] |
Generate table for hamming window.
w | [i/o] MFCC calculation work area | |
framesize | [in] window size |
Definition at line 42 of file mfcc-core.c.
Referenced by WMP_work_new().
static void make_fft_table | ( | MFCCWork * | w, | |
int | n | |||
) | [static] |
Build tables for FFT.
w | [i/o] MFCC calculation work area | |
n | [in] 2^n = FFT point |
Definition at line 67 of file mfcc-core.c.
Referenced by WMP_work_new().
static void make_costbl_makemfcc | ( | MFCCWork * | w, | |
int | fbank_num, | |||
int | mfcc_dim | |||
) | [static] |
Generate table for DCT operation to make mfcc from fbank.
w | [i/o] MFCC calculation work area | |
fbank_num | [in] number of filer banks | |
mfcc_dim | [in] number of dimensions in MFCC |
Definition at line 94 of file mfcc-core.c.
Referenced by WMP_work_new().
static void make_sintbl_wcep | ( | MFCCWork * | w, | |
int | lifter, | |||
int | mfcc_dim | |||
) | [static] |
Generate table for weighing cepstrum.
w | [i/o] MFCC calculation work area | |
lifter | [in] cepstral liftering coefficient | |
mfcc_dim | [in] number of dimensions in MFCC |
Definition at line 127 of file mfcc-core.c.
Referenced by WMP_work_new().
float Mel | ( | int | k, | |
float | fres | |||
) |
Return mel-frequency.
k | [in] channel number of filter bank | |
fres | [in] constant value computed by "1.0E7 / (para.smp_period * fb.fftN * 700.0)" |
Definition at line 155 of file mfcc-core.c.
Referenced by InitFBank().
static boolean VTLN_recreate_fbank_cf | ( | float * | cf, | |
Value * | para, | |||
float | mlo, | |||
float | mhi, | |||
int | maxChan | |||
) | [static] |
Create fbank center frequency for VTLN.
cf | [i/o] center frequency of channels in Mel, will be changed considering VTLN | |
para | [in] analysis parameter | |
mlo | [in] fbank lower bound in Mel | |
mhi | [in] fbank upper bound in Mel | |
maxChan | [in] maximum number of channels |
Definition at line 171 of file mfcc-core.c.
Referenced by InitFBank().
Build filterbank information and generate tables for MFCC comptutation.
w | [i/o] MFCC calculation work area | |
para | [in] configuration parameters |
Definition at line 223 of file mfcc-core.c.
Referenced by WMP_work_new().
void FreeFBank | ( | FBankInfo * | fb | ) |
Free FBankInfo.
fb | [in] filterbank information |
Definition at line 305 of file mfcc-core.c.
Referenced by WMP_free().
void ZMeanFrame | ( | float * | wave, | |
int | framesize | |||
) |
Remove DC offset per frame.
wave | [i/o] waveform data in the current frame | |
framesize | [in] frame size |
Definition at line 322 of file mfcc-core.c.
Referenced by new_SS_calculate(), and WMP_calc().
float CalcLogRawE | ( | float * | wave, | |
int | framesize | |||
) |
Calculate Log Raw Energy.
wave | [in] waveform data in the current frame | |
framesize | [in] frame size |
Definition at line 341 of file mfcc-core.c.
Referenced by WMP_calc().
void PreEmphasise | ( | float * | wave, | |
int | framesize, | |||
float | preEmph | |||
) |
Apply pre-emphasis filter.
wave | [i/o] waveform data in the current frame | |
framesize | [i/o] frame size in samples | |
preEmph | [in] pre-emphasis coef. |
Definition at line 361 of file mfcc-core.c.
Referenced by new_SS_calculate(), and WMP_calc().
void Hamming | ( | float * | wave, | |
int | framesize, | |||
MFCCWork * | w | |||
) |
Apply hamming window.
wave | [i/o] waveform data in the current frame | |
framesize | [in] frame size | |
w | [i/o] MFCC calculation work area |
Definition at line 377 of file mfcc-core.c.
Referenced by new_SS_calculate(), and WMP_calc().
void FFT | ( | float * | xRe, | |
float * | xIm, | |||
int | p, | |||
MFCCWork * | w | |||
) |
Apply FFT.
xRe | [i/o] real part of waveform | |
xIm | [i/o] imaginal part of waveform | |
p | [in] 2^p = FFT point | |
w | [i/o] MFCC calculation work area |
Definition at line 399 of file mfcc-core.c.
Convert wave -> (spectral subtraction) -> mel-frequency filterbank.
wave | [in] waveform data in the current frame | |
w | [i/o] MFCC calculation work area | |
para | [in] configuration parameters |
Definition at line 452 of file mfcc-core.c.
Referenced by WMP_calc().
Calculate 0'th cepstral coefficient.
w | [i/o] MFCC calculation work area | |
para | [in] configuration parameters |
Definition at line 523 of file mfcc-core.c.
Referenced by WMP_calc().
Apply DCT to filterbank to make MFCC.
mfcc | [out] output MFCC vector | |
para | [in] configuration parameters | |
w | [i/o] MFCC calculation work area |
Definition at line 541 of file mfcc-core.c.
Referenced by WMP_calc().
Re-scale cepstral coefficients.
mfcc | [i/o] a MFCC vector | |
para | [in] configuration parameters | |
w | [i/o] MFCC calculation work area |
Definition at line 576 of file mfcc-core.c.
Referenced by WMP_calc().
Setup work area for parameters, values, buffers, tables to compute MFCC vectors, with a given parameter configurations.
para | [in] configuration parameters |
Definition at line 614 of file mfcc-core.c.
Referenced by j_final_fusion(), and j_mfcccalc_new().
Calculate MFCC and log energy for one frame.
Perform spectral subtraction if ssbuf is specified.
w | [i/o] MFCC calculation work area | |
mfcc | [out] buffer to hold the resulting MFCC vector | |
para | [in] configuration parameters |
Definition at line 652 of file mfcc-core.c.
Referenced by RealTimeMFCC(), and Wav2MFCC().
void WMP_free | ( | MFCCWork * | w | ) |
Free all work area for MFCC computation.
w | [i/o] MFCC calculation work area |
Definition at line 694 of file mfcc-core.c.
Referenced by j_mfcccalc_free().