#include <sent/stddefs.h>
#include <sent/mfcc.h>
関数 | |
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. | |
void | 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 |
ここでは,窓をかけて取り出された音声波形データから MFCC 特徴量を 算出するコア関数が納められています.
mfcc-core.c で定義されています。
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 |
mfcc-core.c の 42 行で定義されています。
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 |
mfcc-core.c の 67 行で定義されています。
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 |
mfcc-core.c の 94 行で定義されています。
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 |
mfcc-core.c の 127 行で定義されています。
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)" |
mfcc-core.c の 155 行で定義されています。
参照元 InitFBank().
Build filterbank information and generate tables for MFCC comptutation.
w | [i/o] MFCC calculation work area | |
para | [in] configuration parameters |
mfcc-core.c の 169 行で定義されています。
void FreeFBank | ( | FBankInfo * | fb | ) |
void ZMeanFrame | ( | float * | wave, | |
int | framesize | |||
) |
Remove DC offset per frame
wave | [i/o] waveform data in the current frame | |
framesize | [in] frame size |
mfcc-core.c の 260 行で定義されています。
参照元 new_SS_calculate().
float CalcLogRawE | ( | float * | wave, | |
int | framesize | |||
) |
Calculate Log Raw Energy.
wave | [in] waveform data in the current frame | |
framesize | [in] frame size |
mfcc-core.c の 279 行で定義されています。
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. |
mfcc-core.c の 299 行で定義されています。
参照元 new_SS_calculate().
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 |
mfcc-core.c の 315 行で定義されています。
参照元 new_SS_calculate().
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 |
mfcc-core.c の 336 行で定義されています。
参照元 new_SS_calculate().
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 |
mfcc-core.c の 388 行で定義されています。
Calculate 0'th cepstral coefficient.
w | [i/o] MFCC calculation work area | |
para | [in] configuration parameters |
mfcc-core.c の 448 行で定義されています。
Apply DCT to filterbank to make MFCC.
mfcc | [out] output MFCC vector | |
para | [in] configuration parameters | |
w | [i/o] MFCC calculation work area |
mfcc-core.c の 466 行で定義されています。
Re-scale cepstral coefficients.
mfcc | [i/o] a MFCC vector | |
para | [in] configuration parameters | |
w | [i/o] MFCC calculation work area |
mfcc-core.c の 500 行で定義されています。
Setup work area for parameters, values, buffers, tables to compute MFCC vectors, with a given parameter configurations
para | [in] configuration parameters |
mfcc-core.c の 537 行で定義されています。
参照元 j_final_fusion(), と 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 |
mfcc-core.c の 575 行で定義されています。
参照元 RealTimeMFCC(), と Wav2MFCC().
void WMP_free | ( | MFCCWork * | w | ) |
Free all work area for MFCC computation
w | [i/o] MFCC calculation work area |
mfcc-core.c の 617 行で定義されています。
参照元 j_mfcccalc_free().