\doxysection{fe\+\_\+internal.\+h}
\label{fe__internal_8h_source}\index{src/libsphinxbase/fe/fe\_internal.h@{src/libsphinxbase/fe/fe\_internal.h}}

\begin{DoxyCode}{0}
\DoxyCodeLine{00001\ \textcolor{comment}{/*\ -\/*-\/\ c-\/basic-\/offset:\ 4;\ indent-\/tabs-\/mode:\ nil\ -\/*-\/\ */}}
\DoxyCodeLine{00002\ \textcolor{comment}{/*\ ====================================================================}}
\DoxyCodeLine{00003\ \textcolor{comment}{\ *\ Copyright\ (c)\ 1996-\/2004\ Carnegie\ Mellon\ University.\ \ All\ rights}}
\DoxyCodeLine{00004\ \textcolor{comment}{\ *\ reserved.}}
\DoxyCodeLine{00005\ \textcolor{comment}{\ *}}
\DoxyCodeLine{00006\ \textcolor{comment}{\ *\ Redistribution\ and\ use\ in\ source\ and\ binary\ forms,\ with\ or\ without}}
\DoxyCodeLine{00007\ \textcolor{comment}{\ *\ modification,\ are\ permitted\ provided\ that\ the\ following\ conditions}}
\DoxyCodeLine{00008\ \textcolor{comment}{\ *\ are\ met:}}
\DoxyCodeLine{00009\ \textcolor{comment}{\ *}}
\DoxyCodeLine{00010\ \textcolor{comment}{\ *\ 1.\ Redistributions\ of\ source\ code\ must\ retain\ the\ above\ copyright}}
\DoxyCodeLine{00011\ \textcolor{comment}{\ *\ \ \ \ notice,\ this\ list\ of\ conditions\ and\ the\ following\ disclaimer.\ }}
\DoxyCodeLine{00012\ \textcolor{comment}{\ *}}
\DoxyCodeLine{00013\ \textcolor{comment}{\ *\ 2.\ Redistributions\ in\ binary\ form\ must\ reproduce\ the\ above\ copyright}}
\DoxyCodeLine{00014\ \textcolor{comment}{\ *\ \ \ \ notice,\ this\ list\ of\ conditions\ and\ the\ following\ disclaimer\ in}}
\DoxyCodeLine{00015\ \textcolor{comment}{\ *\ \ \ \ the\ documentation\ and/or\ other\ materials\ provided\ with\ the}}
\DoxyCodeLine{00016\ \textcolor{comment}{\ *\ \ \ \ distribution.}}
\DoxyCodeLine{00017\ \textcolor{comment}{\ *}}
\DoxyCodeLine{00018\ \textcolor{comment}{\ *\ This\ work\ was\ supported\ in\ part\ by\ funding\ from\ the\ Defense\ Advanced\ }}
\DoxyCodeLine{00019\ \textcolor{comment}{\ *\ Research\ Projects\ Agency\ and\ the\ National\ Science\ Foundation\ of\ the\ }}
\DoxyCodeLine{00020\ \textcolor{comment}{\ *\ United\ States\ of\ America,\ and\ the\ CMU\ Sphinx\ Speech\ Consortium.}}
\DoxyCodeLine{00021\ \textcolor{comment}{\ *}}
\DoxyCodeLine{00022\ \textcolor{comment}{\ *\ THIS\ SOFTWARE\ IS\ PROVIDED\ BY\ CARNEGIE\ MELLON\ UNIVERSITY\ \`{}\`{}AS\ IS''\ AND\ }}
\DoxyCodeLine{00023\ \textcolor{comment}{\ *\ ANY\ EXPRESSED\ OR\ IMPLIED\ WARRANTIES,\ INCLUDING,\ BUT\ NOT\ LIMITED\ TO,\ }}
\DoxyCodeLine{00024\ \textcolor{comment}{\ *\ THE\ IMPLIED\ WARRANTIES\ OF\ MERCHANTABILITY\ AND\ FITNESS\ FOR\ A\ PARTICULAR}}
\DoxyCodeLine{00025\ \textcolor{comment}{\ *\ PURPOSE\ ARE\ DISCLAIMED.\ \ IN\ NO\ EVENT\ SHALL\ CARNEGIE\ MELLON\ UNIVERSITY}}
\DoxyCodeLine{00026\ \textcolor{comment}{\ *\ NOR\ ITS\ EMPLOYEES\ BE\ LIABLE\ FOR\ ANY\ DIRECT,\ INDIRECT,\ INCIDENTAL,}}
\DoxyCodeLine{00027\ \textcolor{comment}{\ *\ SPECIAL,\ EXEMPLARY,\ OR\ CONSEQUENTIAL\ DAMAGES\ (INCLUDING,\ BUT\ NOT\ }}
\DoxyCodeLine{00028\ \textcolor{comment}{\ *\ LIMITED\ TO,\ PROCUREMENT\ OF\ SUBSTITUTE\ GOODS\ OR\ SERVICES;\ LOSS\ OF\ USE,\ }}
\DoxyCodeLine{00029\ \textcolor{comment}{\ *\ DATA,\ OR\ PROFITS;\ OR\ BUSINESS\ INTERRUPTION)\ HOWEVER\ CAUSED\ AND\ ON\ ANY\ }}
\DoxyCodeLine{00030\ \textcolor{comment}{\ *\ THEORY\ OF\ LIABILITY,\ WHETHER\ IN\ CONTRACT,\ STRICT\ LIABILITY,\ OR\ TORT\ }}
\DoxyCodeLine{00031\ \textcolor{comment}{\ *\ (INCLUDING\ NEGLIGENCE\ OR\ OTHERWISE)\ ARISING\ IN\ ANY\ WAY\ OUT\ OF\ THE\ USE\ }}
\DoxyCodeLine{00032\ \textcolor{comment}{\ *\ OF\ THIS\ SOFTWARE,\ EVEN\ IF\ ADVISED\ OF\ THE\ POSSIBILITY\ OF\ SUCH\ DAMAGE.}}
\DoxyCodeLine{00033\ \textcolor{comment}{\ *}}
\DoxyCodeLine{00034\ \textcolor{comment}{\ *\ ====================================================================}}
\DoxyCodeLine{00035\ \textcolor{comment}{\ *}}
\DoxyCodeLine{00036\ \textcolor{comment}{\ */}}
\DoxyCodeLine{00037\ }
\DoxyCodeLine{00038\ \textcolor{preprocessor}{\#ifndef\ \_\_FE\_INTERNAL\_H\_\_}}
\DoxyCodeLine{00039\ \textcolor{preprocessor}{\#define\ \_\_FE\_INTERNAL\_H\_\_}}
\DoxyCodeLine{00040\ }
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\DoxyCodeLine{00043\ \textcolor{preprocessor}{\#endif}}
\DoxyCodeLine{00044\ }
\DoxyCodeLine{00045\ \textcolor{preprocessor}{\#include\ "{}sphinxbase/fe.h"{}}}
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\DoxyCodeLine{00053\ \}}
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\DoxyCodeLine{00055\ }
\DoxyCodeLine{00056\ \textcolor{preprocessor}{\#ifdef\ FIXED16}}
\DoxyCodeLine{00057\ \textcolor{comment}{/*\ Q15\ format\ */}}
\DoxyCodeLine{00058\ \textcolor{keyword}{typedef}\ int16\ frame\_t;}
\DoxyCodeLine{00059\ \textcolor{keyword}{typedef}\ int16\ window\_t;}
\DoxyCodeLine{00060\ \textcolor{keyword}{typedef}\ int32\ powspec\_t;}
\DoxyCodeLine{00061\ \textcolor{keyword}{typedef}\ \textcolor{keyword}{struct\ }\{\ int16\ r,\ i;\ \}\ complex;}
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\DoxyCodeLine{00063\ \textcolor{keyword}{typedef}\ fixed32\ frame\_t;}
\DoxyCodeLine{00064\ \textcolor{keyword}{typedef}\ int32\ powspec\_t;}
\DoxyCodeLine{00065\ \textcolor{keyword}{typedef}\ fixed32\ window\_t;}
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\DoxyCodeLine{00068\ \textcolor{keyword}{typedef}\ float64\ frame\_t;}
\DoxyCodeLine{00069\ \textcolor{keyword}{typedef}\ float64\ powspec\_t;}
\DoxyCodeLine{00070\ \textcolor{keyword}{typedef}\ float64\ window\_t;}
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\DoxyCodeLine{00073\ }
\DoxyCodeLine{00074\ \textcolor{comment}{/*\ Values\ for\ the\ 'logspec'\ field.\ */}}
\DoxyCodeLine{00075\ \textcolor{keyword}{enum}\ \{}
\DoxyCodeLine{00076\ \ \ \ \ \ \ \ \ RAW\_LOG\_SPEC\ =\ 1,}
\DoxyCodeLine{00077\ \ \ \ \ \ \ \ \ SMOOTH\_LOG\_SPEC\ =\ 2}
\DoxyCodeLine{00078\ \};}
\DoxyCodeLine{00079\ }
\DoxyCodeLine{00080\ \textcolor{comment}{/*\ Values\ for\ the\ 'transform'\ field.\ */}}
\DoxyCodeLine{00081\ \textcolor{keyword}{enum}\ \{}
\DoxyCodeLine{00082\ \ \ \ \ \ \ \ \ LEGACY\_DCT\ =\ 0,}
\DoxyCodeLine{00083\ \ \ \ \ \ \ \ \ DCT\_II\ =\ 1,}
\DoxyCodeLine{00084\ \ \ \ \ \ \ \ \ DCT\_HTK\ =\ 2}
\DoxyCodeLine{00085\ \};}
\DoxyCodeLine{00086\ }
\DoxyCodeLine{00087\ \textcolor{keyword}{typedef}\ \textcolor{keyword}{struct\ }melfb\_s\ melfb\_t;}
\DoxyCodeLine{00089\ \textcolor{keyword}{struct\ }melfb\_s\ \{}
\DoxyCodeLine{00090\ \ \ \ \ float32\ sampling\_rate;}
\DoxyCodeLine{00091\ \ \ \ \ int32\ num\_cepstra;}
\DoxyCodeLine{00092\ \ \ \ \ int32\ num\_filters;}
\DoxyCodeLine{00093\ \ \ \ \ int32\ fft\_size;}
\DoxyCodeLine{00094\ \ \ \ \ float32\ lower\_filt\_freq;}
\DoxyCodeLine{00095\ \ \ \ \ float32\ upper\_filt\_freq;}
\DoxyCodeLine{00096\ \ \ \ \ \textcolor{comment}{/*\ DCT\ coefficients.\ */}}
\DoxyCodeLine{00097\ \ \ \ \ mfcc\_t\ **mel\_cosine;}
\DoxyCodeLine{00098\ \ \ \ \ \textcolor{comment}{/*\ Filter\ coefficients.\ */}}
\DoxyCodeLine{00099\ \ \ \ \ mfcc\_t\ *filt\_coeffs;}
\DoxyCodeLine{00100\ \ \ \ \ int16\ *spec\_start;}
\DoxyCodeLine{00101\ \ \ \ \ int16\ *filt\_start;}
\DoxyCodeLine{00102\ \ \ \ \ int16\ *filt\_width;}
\DoxyCodeLine{00103\ \ \ \ \ \textcolor{comment}{/*\ Luxury\ mobile\ home.\ */}}
\DoxyCodeLine{00104\ \ \ \ \ int32\ doublewide;}
\DoxyCodeLine{00105\ \ \ \ \ \textcolor{keywordtype}{char}\ \textcolor{keyword}{const}\ *warp\_type;}
\DoxyCodeLine{00106\ \ \ \ \ \textcolor{keywordtype}{char}\ \textcolor{keyword}{const}\ *warp\_params;}
\DoxyCodeLine{00107\ \ \ \ \ uint32\ warp\_id;}
\DoxyCodeLine{00108\ \ \ \ \ \textcolor{comment}{/*\ Precomputed\ normalization\ constants\ for\ unitary\ DCT-\/II/DCT-\/III\ */}}
\DoxyCodeLine{00109\ \ \ \ \ mfcc\_t\ sqrt\_inv\_n,\ sqrt\_inv\_2n;}
\DoxyCodeLine{00110\ \ \ \ \ \textcolor{comment}{/*\ Value\ and\ coefficients\ for\ HTK-\/style\ liftering\ */}}
\DoxyCodeLine{00111\ \ \ \ \ int32\ lifter\_val;}
\DoxyCodeLine{00112\ \ \ \ \ mfcc\_t\ *lifter;}
\DoxyCodeLine{00113\ \ \ \ \ \textcolor{comment}{/*\ Normalize\ filters\ to\ unit\ area\ */}}
\DoxyCodeLine{00114\ \ \ \ \ int32\ unit\_area;}
\DoxyCodeLine{00115\ \ \ \ \ \textcolor{comment}{/*\ Round\ filter\ frequencies\ to\ DFT\ points\ (hurts\ accuracy,\ but\ is}}
\DoxyCodeLine{00116\ \textcolor{comment}{\ \ \ \ \ \ \ useful\ for\ legacy\ purposes)\ */}}
\DoxyCodeLine{00117\ \ \ \ \ int32\ round\_filters;}
\DoxyCodeLine{00118\ \};}
\DoxyCodeLine{00119\ }
\DoxyCodeLine{00120\ \textcolor{comment}{/*\ sqrt(1/2),\ also\ used\ for\ unitary\ DCT-\/II/DCT-\/III\ */}}
\DoxyCodeLine{00121\ \textcolor{preprocessor}{\#define\ SQRT\_HALF\ FLOAT2MFCC(0.707106781186548)}}
\DoxyCodeLine{00122\ }
\DoxyCodeLine{00124\ \textcolor{keyword}{struct\ }fe\_s\ \{}
\DoxyCodeLine{00125\ \ \ \ \ cmd\_ln\_t\ *config;}
\DoxyCodeLine{00126\ \ \ \ \ \textcolor{keywordtype}{int}\ refcount;}
\DoxyCodeLine{00127\ }
\DoxyCodeLine{00128\ \ \ \ \ float32\ sampling\_rate;}
\DoxyCodeLine{00129\ \ \ \ \ int16\ frame\_rate;}
\DoxyCodeLine{00130\ \ \ \ \ int16\ frame\_shift;}
\DoxyCodeLine{00131\ }
\DoxyCodeLine{00132\ \ \ \ \ float32\ window\_length;}
\DoxyCodeLine{00133\ \ \ \ \ int16\ frame\_size;}
\DoxyCodeLine{00134\ \ \ \ \ int16\ fft\_size;}
\DoxyCodeLine{00135\ }
\DoxyCodeLine{00136\ \ \ \ \ uint8\ fft\_order;}
\DoxyCodeLine{00137\ \ \ \ \ uint8\ feature\_dimension;}
\DoxyCodeLine{00138\ \ \ \ \ uint8\ num\_cepstra;}
\DoxyCodeLine{00139\ \ \ \ \ uint8\ remove\_dc;}
\DoxyCodeLine{00140\ \ \ \ \ uint8\ log\_spec;}
\DoxyCodeLine{00141\ \ \ \ \ uint8\ swap;}
\DoxyCodeLine{00142\ \ \ \ \ uint8\ dither;}
\DoxyCodeLine{00143\ \ \ \ \ uint8\ transform;}
\DoxyCodeLine{00144\ }
\DoxyCodeLine{00145\ \ \ \ \ float32\ pre\_emphasis\_alpha;}
\DoxyCodeLine{00146\ \ \ \ \ int32\ seed;}
\DoxyCodeLine{00147\ }
\DoxyCodeLine{00148\ \ \ \ \ int16\ frame\_counter;}
\DoxyCodeLine{00149\ \ \ \ \ uint8\ start\_flag;}
\DoxyCodeLine{00150\ \ \ \ \ uint8\ reserved;}
\DoxyCodeLine{00151\ }
\DoxyCodeLine{00152\ \ \ \ \ \textcolor{comment}{/*\ Twiddle\ factors\ for\ FFT.\ */}}
\DoxyCodeLine{00153\ \ \ \ \ frame\_t\ *ccc,\ *sss;}
\DoxyCodeLine{00154\ \ \ \ \ \textcolor{comment}{/*\ Mel\ filter\ parameters.\ */}}
\DoxyCodeLine{00155\ \ \ \ \ melfb\_t\ *mel\_fb;}
\DoxyCodeLine{00156\ \ \ \ \ \textcolor{comment}{/*\ Half\ of\ a\ Hamming\ Window.\ */}}
\DoxyCodeLine{00157\ \ \ \ \ window\_t\ *hamming\_window;}
\DoxyCodeLine{00158\ }
\DoxyCodeLine{00159\ \ \ \ \ \textcolor{comment}{/*\ Temporary\ buffers\ for\ processing.\ */}}
\DoxyCodeLine{00160\ \ \ \ \ \textcolor{comment}{/*\ FIXME:\ too\ many\ of\ these.\ */}}
\DoxyCodeLine{00161\ \ \ \ \ int16\ *spch;}
\DoxyCodeLine{00162\ \ \ \ \ frame\_t\ *frame;}
\DoxyCodeLine{00163\ \ \ \ \ powspec\_t\ *spec,\ *mfspec;}
\DoxyCodeLine{00164\ \ \ \ \ int16\ *overflow\_samps;}
\DoxyCodeLine{00165\ \ \ \ \ int16\ num\_overflow\_samps;\ \ \ \ }
\DoxyCodeLine{00166\ \ \ \ \ int16\ prior;}
\DoxyCodeLine{00167\ \};}
\DoxyCodeLine{00168\ }
\DoxyCodeLine{00169\ \textcolor{preprocessor}{\#define\ BB\_SAMPLING\_RATE\ 16000}}
\DoxyCodeLine{00170\ \textcolor{preprocessor}{\#define\ DEFAULT\_BB\_FFT\_SIZE\ 512}}
\DoxyCodeLine{00171\ \textcolor{preprocessor}{\#define\ DEFAULT\_BB\_FRAME\_SHIFT\ 160}}
\DoxyCodeLine{00172\ \textcolor{preprocessor}{\#define\ DEFAULT\_BB\_NUM\_FILTERS\ 40}}
\DoxyCodeLine{00173\ \textcolor{preprocessor}{\#define\ DEFAULT\_BB\_LOWER\_FILT\_FREQ\ 133.33334}}
\DoxyCodeLine{00174\ \textcolor{preprocessor}{\#define\ DEFAULT\_BB\_UPPER\_FILT\_FREQ\ 6855.4976}}
\DoxyCodeLine{00175\ }
\DoxyCodeLine{00176\ \textcolor{preprocessor}{\#define\ NB\_SAMPLING\_RATE\ 8000}}
\DoxyCodeLine{00177\ \textcolor{preprocessor}{\#define\ DEFAULT\_NB\_FFT\_SIZE\ 256}}
\DoxyCodeLine{00178\ \textcolor{preprocessor}{\#define\ DEFAULT\_NB\_FRAME\_SHIFT\ 80}}
\DoxyCodeLine{00179\ \textcolor{preprocessor}{\#define\ DEFAULT\_NB\_NUM\_FILTERS\ 31}}
\DoxyCodeLine{00180\ \textcolor{preprocessor}{\#define\ DEFAULT\_NB\_LOWER\_FILT\_FREQ\ 200}}
\DoxyCodeLine{00181\ \textcolor{preprocessor}{\#define\ DEFAULT\_NB\_UPPER\_FILT\_FREQ\ 3500}}
\DoxyCodeLine{00182\ }
\DoxyCodeLine{00183\ \textcolor{keywordtype}{void}\ fe\_init\_dither(int32\ seed);}
\DoxyCodeLine{00184\ }
\DoxyCodeLine{00185\ \textcolor{comment}{/*\ Apply\ 1/2\ bit\ noise\ to\ a\ buffer\ of\ audio.\ */}}
\DoxyCodeLine{00186\ int32\ fe\_dither(int16\ *buffer,\ int32\ nsamps);}
\DoxyCodeLine{00187\ }
\DoxyCodeLine{00188\ \textcolor{comment}{/*\ Load\ a\ frame\ of\ data\ into\ the\ fe.\ */}}
\DoxyCodeLine{00189\ \textcolor{keywordtype}{int}\ fe\_read\_frame(fe\_t\ *fe,\ int16\ \textcolor{keyword}{const}\ *in,\ int32\ len);}
\DoxyCodeLine{00190\ }
\DoxyCodeLine{00191\ \textcolor{comment}{/*\ Shift\ the\ input\ buffer\ back\ and\ read\ more\ data.\ */}}
\DoxyCodeLine{00192\ \textcolor{keywordtype}{int}\ fe\_shift\_frame(fe\_t\ *fe,\ int16\ \textcolor{keyword}{const}\ *in,\ int32\ len);}
\DoxyCodeLine{00193\ }
\DoxyCodeLine{00194\ \textcolor{comment}{/*\ Process\ a\ frame\ of\ data\ into\ features.\ */}}
\DoxyCodeLine{00195\ int32\ fe\_write\_frame(fe\_t\ *fe,\ mfcc\_t\ *fea);}
\DoxyCodeLine{00196\ }
\DoxyCodeLine{00197\ \textcolor{comment}{/*\ Initialization\ functions.\ */}}
\DoxyCodeLine{00198\ int32\ fe\_build\_melfilters(melfb\_t\ *MEL\_FB);}
\DoxyCodeLine{00199\ int32\ fe\_compute\_melcosine(melfb\_t\ *MEL\_FB);}
\DoxyCodeLine{00200\ \textcolor{keywordtype}{void}\ fe\_create\_hamming(window\_t\ *in,\ int32\ in\_len);}
\DoxyCodeLine{00201\ \textcolor{keywordtype}{void}\ fe\_create\_twiddle(fe\_t\ *fe);}
\DoxyCodeLine{00202\ }
\DoxyCodeLine{00203\ \textcolor{comment}{/*\ Miscellaneous\ processing\ functions.\ */}}
\DoxyCodeLine{00204\ \textcolor{keywordtype}{void}\ fe\_spec2cep(fe\_t\ *\ fe,\ \textcolor{keyword}{const}\ powspec\_t\ *\ mflogspec,\ mfcc\_t\ *\ mfcep);}
\DoxyCodeLine{00205\ \textcolor{keywordtype}{void}\ fe\_dct2(fe\_t\ *fe,\ \textcolor{keyword}{const}\ powspec\_t\ *mflogspec,\ mfcc\_t\ *mfcep,\ \textcolor{keywordtype}{int}\ htk);}
\DoxyCodeLine{00206\ \textcolor{keywordtype}{void}\ fe\_dct3(fe\_t\ *fe,\ \textcolor{keyword}{const}\ mfcc\_t\ *mfcep,\ powspec\_t\ *mflogspec);}
\DoxyCodeLine{00207\ }
\DoxyCodeLine{00208\ \textcolor{preprocessor}{\#ifdef\ \_\_cplusplus}}
\DoxyCodeLine{00209\ \}}
\DoxyCodeLine{00210\ \textcolor{preprocessor}{\#endif}}
\DoxyCodeLine{00211\ }
\DoxyCodeLine{00212\ \textcolor{preprocessor}{\#endif\ }\textcolor{comment}{/*\ \_\_FE\_INTERNAL\_H\_\_\ */}\textcolor{preprocessor}{}}

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