#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. | |
| 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 | |
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。
参照元 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 |
mfcc-core.c の 67 行で定義されています。
参照元 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 |
mfcc-core.c の 94 行で定義されています。
参照元 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 |
mfcc-core.c の 127 行で定義されています。
参照元 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)" |
mfcc-core.c の 155 行で定義されています。
参照元 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 |
mfcc-core.c の 171 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 223 行で定義されています。
参照元 WMP_work_new().
| 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 322 行で定義されています。
| 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 341 行で定義されています。
参照元 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. |
mfcc-core.c の 361 行で定義されています。
| 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 377 行で定義されています。
| 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 399 行で定義されています。
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 452 行で定義されています。
参照元 WMP_calc().
Calculate 0'th cepstral coefficient.
| w | [i/o] MFCC calculation work area | |
| para | [in] configuration parameters |
mfcc-core.c の 523 行で定義されています。
参照元 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 |
mfcc-core.c の 541 行で定義されています。
参照元 WMP_calc().
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 576 行で定義されています。
参照元 WMP_calc().
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 614 行で定義されています。
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 652 行で定義されています。
参照元 RealTimeMFCC()・Wav2MFCC().
| void WMP_free | ( | MFCCWork * | w | ) |
Free all work area for MFCC computation
| w | [i/o] MFCC calculation work area |
mfcc-core.c の 694 行で定義されています。
参照元 j_mfcccalc_free().
1.5.1