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[[Reference of hts_engine API]]
#contents
&br;
* Preprocessor symbols for conditional compilation　[#b930707d]
- For embedded device
HTS_EMBEDDED (slightly faster setting is used)
- Audio device setting
AUDIO_PLAY_WIN32 (for Windows 2000/XP/Vista C++ compiler)
AUDIO_PLAY_WINCE (for Windows Mobile C++ compiler)
AUDIO_PLAY_NONE (default)
- For [[Festival speech synthesis system:http://festvox.org/]]
FESTIVAL
- Endian definition
WORDS_BIGENDIAN (e.g. PowerPC, Cell BE, SPARC, 680x0)
WORDS_LITTLEENDIAN (e.g. x86, Alpha AXP)
* Structures [#y072254d]
** Models [#e904ac7d]
*** HTS_ModelSet [#s84d95d0]
> Set of HMMs and duration models.
int nstate - # of HMM states
int lf0stream - # of stream for F0
int mcpvsize - vector size for spectrum
int *nlf0pdf - # of PDFs at each state position (F0)
int *nmcppdf - # of PDFs at each state position (spectrum)
int ndurpdf - # of PDFs (duration)
double **durpdf - array of PDFs (duration)
double ***mcppdf - array of PDFs (spectrum)
double ****lf0pdf - array of PDFs (F0)
double weight_interp - weight for model interpolation
*** HTS_Model [#hca72a1d]
> A subword HMM in an utterance HMM.
char *name - name of this HMM (name only)
char *lab - label of this HMM (includes other information)
int durpdf - duration PDF index
int *lf0pdf - F0 PDF indexes
int *mcppdf - spectrum PDF indexes
int *dur - state durations (frame)
int totaldur - total duration in this HMM (frame)
double **lf0mean - mean vectors of F0 PDFs
double **lf0variance - diag variances of F0 PDFs
double **mcpmean - mean vectors of spectrum PDFs
double **mcpvariance - diag variances of spectrum PDFs
HTS_Boolean *voiced - voiced/unvoiced flags in this HMM
struct _HTS_Model *next - pointer to the next subword HMM
HTS_Boolean bool_rate - flag for speaking rate modification
HTS_Boolean bool_dur - flag for duration modification
HTS_Boolean bool_f0_level - flag for f0 level modification
HTS_Boolean bool_f0_range - flag for f0 range modification
HTS_Boolean bool_volume - flag for volume modification
HTS_Boolean bool_alpha - flag for frequency warping modification
double lab_rate - speaking rate specified in the given label
int lab_dur - # of frames specified in the given label
double lab_f0_level - f0 level specified in the given label
double lab_f0_range - f0 range specified in the given label
double lab_volume - volume specified in the given label
double lab_alpha - frequency warping specified in the given label
*** HTS_UttModel [#ke553faa]
> An utterance HMM.
HTS_Model *mhead - list of subword HMMs (head)
HTS_Model *mtail - list of subword HMMs (tail)
int nModel - # of subword HMMs in this utterance HMM
int nState - total # of HMM states in this utterance HMM
int totalframe - total # of frames in this utterance
** Trees [#n794348b]
*** HTS_Pattern [#xdfc3831]
> List of patterns in a question.
char *pat - pattern string
struct _HTS_Pattern *next - pointer to the next pattern
*** HTS_Question [#b0a9afa1]
> List of questions in HTS_TreeSet.
char *qName - name of this question
HTS_Pattern *phead - list of patterns (head)
HTS_Pattern *ptail - list of patterns (tail)
struct _HTS_Question *next - pointer to the next question
*** HTS_Node [#v097f6cf]
> List of tree nodes in a decision tree.
int idx - index of this node
int pdf - index of PDF for this node (leaf node only)
struct _HTS_Node *yes - pointer to its child node (yes)
struct _HTS_Node *no - pointer to its child node (no)
struct _HTS_Node *next - pointer to the next node
HTS_Question *quest - question applied at this node
*** HTS_Tree [#jb5f426a]
> List of decision trees in HTS_TreeSet.
int state - state position of this tree
HTS_Pattern *phead - list of patterns used in this tree (head)
HTS_Pattern *ptail - list of patterns used in this tree (tail)
struct _HTS_Tree *next - pointer to the next tree
HTS_Node *root - root node of this tree
HTS_Node *leaf - list of leaf nodes in this tree
*** HTS_TreeSet [#o01982e3]
> Set of decision trees.
HTS_Question *qhead[HTS_NUMMTYPE] - lists of questions for spectrum, F0 & duration (head)
HTS_Question *qtail[HTS_NUMMTYPE] - lists of questions for spectrum, F0 & duration (tail)
HTS_Tree *thead[HTS_NUMMTYPE] - lists of trees for spectrum, F0 & duration (head)
HTS_Tree *ttail[HTS_NUMMTYPE] - lists of trees for spectrum, F0 & duration (tail)
int nTrees[HTS_NUMMTYPE] - # of trees for spectrum, F0 & duration
** Parameter generation [#v6419ed7]
*** HTS_DWin [#w20384ff]
- Window coefficients to calculate dynamic features.
int num - # of windows (static, delta, delta-delta -> 3)
int **width - width of windows [0..num-1][0(left) 1(right)]
double **coef - window coefficients [0..num-1][width[0]..width[1]]
int maxw[2] - maximum width [0(left) 1(right)]
int max_L - maximum width {maxw[0], maxw[1]}
*** HTS_SMatrices [#yd54811c]
- Matrices/Vectors used in the speech parameter generation algorithm.
double **mseq - mean vector sequence
double **ivseq - inverse diag variance sequence
double *g - vector used in the forward substitution
double **WUW - W' U^-1 W
double *WUM - W' U^-1 mu
*** HTS_PStream [#bb9e7952]
- PDF stream used in the speech parameter generation algorithm.
int vSize - vector size of an observation vector (includes static & dynamic features)
int order - vector size of static features
int T - vector length (# of frames)
int width - maximum width of dynamic feature windows
HTS_DWin dw - dynamic feature windows
double **par - output parameter vector
HTS_SMatrices sm - matrices/vectors for parameter generation
HTS_Boolean *voiced - voiced/unvoiced decision
** Global settings [#t58554e0]
*** HTS_globalP [#gd4808ee]
- Global settings.
int rate - sampling rate (Hz)
int fperiod - frame shift (points)
double rho - speaking rate
double alpha - frequency warping
double beta - postfiltering coefficient
double f0_std - F0 multiply
double f0_mean - F0 bias
double uv - voiced/unvoiced threshold
double length - total number of frames
HTS_Boolean algnst - use state-level alignments from labels
HTS_Boolean algnph - use phone-level alignments from labels
int totaldur - total frame
int totalframe - total frame
int nsample - # of samples in a synthesized waveform
int buff_size - buffer size of audio output device
short *raw_data - synthesized waveform
HTS_Boolean stored_raw_data - flag to store a synthesized waveform in raw_data
*** HTS_AudioSet [#i320d4cd]
- For MS Windows (Windows Mobile) audio output device.
HWAVEOUT hwaveout - audio device handle
WAVEFORMATEX waveformatex - wave formatex
short *buff - current buffer
int buff_size - current buffer size
int which_buff - double buffering flag
HTS_Boolean now_buff_1 - double buffering flag
HTS_Boolean now_buff_2 - double buffering flag
WAVEHDR buff_1 - buffer
WAVEHDR buff_2 - buffer
int max_buff_size - buffer size of audio output device
- For Linux, etc.
int i - make compiler happy
*** HTS_VocoderSet [#aa21d7f5]
- MLSA filter settings. Usually you don't need to set this structure manually.
int fprd - frame shift
int iprd - interpolation period
int seed - seed of random generator
int pd - Pade approximation order (4 or 5)
unsigned long next - temporary variable for random generator
HTS_Boolean gauss - flag to use Gaussian noise
double p1 - used in excitation generation
double pc - used in excitation generation
double pade[21] - Pade coefficients
double *ppade - Pade array
double *c, *cc, *cinc, *d1 - used in the MLSA filter
double rate - sampling rate
int sw - switch used in random generator
double r1, r2, s - used in random generator
int x - excitation signal
HTS_AudioSet *as - pointer for audio device
int size - buffer size for postfiltering
double *d - used in postfiltering
double *g - used in postfiltering
double *mc - mel-cepstral coefficients
double *cep - cepstral coefficients
double *ir - impulse response
int o - used in postfiltering
int irleng - length of impulse response
*** HTS_Engine [#udd70536]
- HTS_Engine itself.
HTS_ModelSet *ms - sets of HMMs and duration models
HTS_TreeSet *ts - sets of decision trees
HTS_PStream lf0pst - PDF stream for F0
HTS_PStream mcppst - PDF stream for spectrum
HTS_globalP gp - global settings
int num_interp - # of models for interpolation
* Functions [#o5c11fa0]
** HTS_Engine functions [#i1438ea1]
*** HTS_Engine_initialize [#bc3db532]
void HTS_Engine_initialize(HTS_Engine *engine);
- Use: Initialize HTS_Engine structure.
- Arguments:
HTS_Engine *engine - Pointer for HTS_Engine structure
- ''Attention!!:'' To start HTS_Engine module, first you should call this function.
*** HTS_Engine_load_fn [#m45f8973]
void HTS_Engine_load_fn(HTS_Engine *engine,
char **fn_ms_lf0,char **fn_ms_mcp,char **fn_ms_dur,
char **fn_ts_lf0,char **fn_ts_mcp,char **fn_ts_dur,
int num_ws_lf0,char **fn_ws_lf0,
int num_ws_mcp,char **fn_ws_mcp,
double *rate_interp,int num_interp);
- Use: Load models/trees/windows from files using given filenames.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
char **fn_ms_lf0 - F0 PDF file names
char **fn_ms_mcp - spectrum PDF file names
char **fn_ms_dur - duration PDF file names
char **fn_ts_lf0 - F0 tree file names
char **fn_ts_mcp - spectrum tree file names
char **fn_ts_dur - duration tree file names
int num_ws_lf0 - # of dynamic feature windows for F0
char **fn_ws_lf0 - dynamic feature window file names for F0
int num_ws_mcp - # of dynamic feature windows for spectrum
char **fn_ws_mcp - dynamic feature window file names for spectrum
double *rate_interp - model interpolation rates
int num_interp - # of models to be interpolated
- ''Attention!!'': You should initialize variable '''engine''' using HTS_Engine_initialize before calling this function. If rate_interp==NULL, interpolation rates of all models are set to the same value.
*** HTS_Engine_load_fp [#w7185327]
void HTS_Engine_load_fp(HTS_Engine *engine,
FILE **fp_ms_lf0,FILE **fp_ms_mcp,FILE **fp_ms_dur,
FILE **fp_ts_lf0,FILE **fp_ts_mcp,FILE **fp_ts_dur,
int num_ws_lf0,FILE **fp_ws_lf0,
int num_ws_mcp,FILE **fp_ws_mcp,
double *rate_interp,int num_interp);
- Use: Load models, trees & windows from files using given file pointers.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
FILE **fp_ms_lf0 - F0 PDF file pointers
FILE **fp_ms_mcp - spectrum PDF file pointers
FILE **fp_ms_dur - duration PDF file pointers
FILE **fp_ts_lf0 - F0 tree file pointers
FILE **fp_ts_mcp - spectrum tree file pointers
FILE **fp_ts_dur - duration tree file pointers
int num_ws_lf0 - # of dynamic feature windows for F0
FILE **fp_ws_lf0 - dynamic feature window file pointers for F0
int num_ws_mcp - # of dynamic feature windows for spectrum
FILE **fp_ws_mcp - dynamic feature window file pointers for spectrum
double *rate_interp - model interpolation rates
int num_interp - # of models to be interpolated
- ''Attention!!'': You should initialize variable '''engine''' using HTS_Engine_initialize before calling this function. If rate_interp==NULL, interpolation rates of all models are set to the same value.
*** HTS_Engine_process [#i593ddb8]
void HTS_Engine_process(HTS_Engine *engine,HTS_Model *model,
FILE *wavfp, FILE *rawfp, FILE *lf0fp,
FILE *mcpfp, FILE *durfp, FILE *tracefp,
double *fr_f0, double *fr_power);
- Use: run HMM-based speech synthesis.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
HTS_Model *model - HTS_Model structure
FILE *wavfp - file pointer for RIFF waveform output
FILE *rawfp - file pointer for raw audio output
FILE *lf0fp - file pointer for generated (log) F0 sequence
FILE *mcpfp - file pointer for generated spectrum (mel-cepstrum)
FILE *durfp - file pointer for predicted durations
FILE *tracefp - file pointer for trace information
double *fr_f0 - Given F0 values
double *fr_power - Given powers
- ''Attention!!'': You can give F0 values or powers predicted by other modules via fr_f0 and fr_power.
*** HTS_Engine_refresh [#k57f1d0c]
void HTS_Engine_refresh(HTS_Engine *engine, Model *mhead);
- Use: free model list.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
Model *mhead - HTS_Model structure
- ''Attention!!'': You should call this function if you want to run HTS_Engine_process multiple times.
*** HTS_Engine_clear [#c3442e8d]
void HTS_Engine_clear(HTS_Engine *engine);
- Use: free memory.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
** HTS_Engine setting function [#xb2cbf1a]
*** HTS_Engine_set_sampling_rate [#q41e65a1]
void HTS_Engine_set_sampling_rate(HTS_Engine *engine,int i);
- Use: set sampling frequency.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
int i - sampling frequency (Hz), 0 < i <= 48000
- ''Attention!!:'' Default value is 16000.
*** HTS_Engine_set_fperiod [#c5c89881]
void HTS_Engine_set_fperiod(HTS_Engine *engine,int i);
- Use: set frame shift.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
int i - frame shift (point), 0 < i <= 2000
- ''Attention!!:'' Default value is 80.
*** HTS_Engine_set_alpha [#tbe7cee5]
void HTS_Engine_set_alpha(HTS_Engine *engine,double f);
- Use: set frequency warping parameter alpha.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
double f - alpha, 0.0 <= f <= 1.0
- ''Attention!!:'' Default value is 0.42.
*** HTS_Engine_set_beta [#m44c517c]
void HTS_SetBeta(HTS_Engine *engine,double f);
- Use: set postfiltering coefficient parameter beta.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
double f - beta, -0.8 <= f <= 0.8
- ''Attention!!:'' Default value is 0.0. If you set beta large value, formant structure will be emphasized strongly.
*** HTS_Engine_set_rho [#ha467b8e]
void HTS_Engine_set_rho(HTS_Engine *engine,double f);
- Use: set speaking rate control parameter rho.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
double f - rho, -1.0 <= f <= 1.0
- ''Attention!!:'' Default value is 0.0. If you set beta negative value, speaking rate of synthesized speech becomes fast.
*** HTS_Engine_set_f0_std [#v7dd1f01]
void HTS_Engine_set_f0_std(HTS_Engine *engine,double f);
- Use: set a parameter to be multiplied to generated F0 values
- Arguments:
HTS_Engine *engine - HTS_Engine structure
double f - F0 multiply value, 0.0 <= f <= 5.0
- ''Attention!!:'' Default value is 1.0.
*** HTS_Engine_set_f0_mean [#eb468ba6]
void HTS_Engine_set_f0_mean(HTS_Engine *engine,double f);
- Use: set a parameter to be added to generated F0 values
- Arguments:
HTS_Engine *engine - HTS_Engine structure
double f - F0 bias value, 0.0 <= f <= 100.0
- ''Attention!!:'' Default value is 0.0.
*** HTS_Engine_set_uv [#c0f3dac6]
void HTS_Engine_set_uv(HTS_Engine *engine,double f);
- Use: set voiced/unvoiced threshold.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
double f - voiced/unvoiced threshold, 0.0 <= f <= 1.0
- ''Attention!!:'' Default value 0.5.
*** HTS_Engine_set_length [#b06b19c7]
void HTS_Engine_set_length(HTS_Engine *engine,double f);
- Use: set total length of utterance in second
- Arguments:
HTS_Engine *engine - HTS_Engine structure
double f - total length of utterance (second), 0.0 <= f <= 30.0
- ''Attention!!:'' Default value is 0.0 (using predicted durations by state duration models).
*** HTS_Engine_set_algnst [#w1aa23b5]
void HTS_Engine_set_algnst(HTS_Engine *engine,HTS_Boolean i);
- Use: set flag whether state-level alignments from given labels is used or not.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
HTS_Boolean i - flag whether state-level alignments from given labels is used or not
- ''Attention!!:'' Default value is FALSE.
*** HTS_Engine_set_algnph [#b326f87f]
void HTS_Engine_set_algnph(HTS_Engine *engine,HTS_Boolean i);
- Use: set flag whether phone-level alignments from given labels is used or not.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
HTS_Boolean i - flag whether phone-level alignments from given labels is used or not
- ''Attention!!:'' Default value is FALSE.
*** HTS_Engine_set_buff_size [#ud5632df]
void HTS_Engine_set_buff_size(HTS_Engine *engine, int i);
- Use: set buffer size for audio device.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
int i - buffer size (pt), 0 < i <= 48000
- ''Attention!!:'' Default value is 0. If i==0, direct audio play is turned off.
*** HTS_Engine_set_stored_raw_data [#k5fc1be0]
void HTS_Engine_set_stored_raw_data(HTS_Engine *engine,HTS_Boolean i);
- Use: set flag whether a synthesized waveform is stored in an array.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
HTS_Boolean i - if TRUE, synthesized waveform is stored
- ''Attention!!:'' Default value is FALSE.
*** HTS_Engine_get_sampling_rate [#j4e9c970]
int HTS_Engine_get_sampling_rate(HTS_Engine *engine);
- Use: get sampling frequency.
- Return value: sampling frequency (Hz)
- Arguments:
HTS_Engine *engine - HTS_Engine structure
*** HTS_Engine_get_total_dur [#l57d5bb9]
int HTS_Engine_get_total_dur(HTS_Engine *engine);
- Use: get total durations
- Return value: get total durations
- Arguments:
HTS_Engine *engine - HTS_Engine structure
*** HTS_Engine_get_total_frame [#fb2b6082]
int HTS_Engine_get_total_frame(HTS_Engine *engine);
- Use: get total # of frame.
- Return value: total # of frames．
- Arguments:
HTS_Engine *engine - HTS_Engine structure
*** HTS_Engine_get_nsample [#oa0b9847]
int HTS_Engine_get_nsample(HTS_Engine *engine);
- Use: get # of samples in a synthesized waveform.
- Return value: # of samples.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
*** HTS_Engine_get_pros_len [#p93969ff]
int HTS_Engine_get_pros_len(HTS_Engine *engine);
- Use: get spectrum, F0 data length.
- Return value: data length.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
*** HTS_Engine_get_pros [#e30e0ece]
HTS_Boolean HTS_Engine_get_pros(HTS_Engine *engine,int len,
double *f0_data,double *power_data);
- Use: get mcp, lf0 data array.
- Return value: if len==data length, return TRUE.
- Arguments:
HTS_Engine *engine - HTS_Engine structure
int len - data length
double *f0_data - generated F0 sequence
double *power_data - generated spectrum (mel-cepstrum) sequence
*** HTS_Engine_get_stored_raw_data [#r88fe434]
short *HTS_Engine_get_stored_raw_data(HTS_Engine *engine);
- Use: get stored raw data.
- Return value: short array which contains a synthesized waveform．
- Arguments:
HTS_Engine *engine - HTS_Engine structure
** HTS_Model function [#h27b18c2]
*** HTS_Model_load_from_labfp [#qdd1e7a5]
void HTS_Model_load_from_labfp(HTS_Model *mhead,FILE *labfp);
- Use: load model list from label file pointer.
- Arguments:
HTS_Model *mhead - HTS_Model structure pointer
FILE *labfp - label file pointer
*** HTS_Model_load_from_labfn [#k847cea5]
void HTS_Model_load_from_labfn (HTS_Model *mhead,char *fn);
- Use: load model list from label file name.
- Arguments:
HTS_Model *mhead - HTS_Model structure pointer
char *fn - label file name
*** HTS_Model_load_from_string [#nb56c314]
void HTS_Model_load_from_string (HTS_Model *mhead,char *labdata);
- Use: load model list from string.
- Arguments:
HTS_Model *mhead - HTS_Model structure pointer
char *labdata - label string
*** HTS_Model_load_from_string_list [#sc61a8ee]
void HTS_Model_load_from_string_list (HTS_Model *mhead,char **labdata,int size);
- Use: load model list from string list.
- Arguments:
HTS_Model *mhead - HTS_Model structure pointer
char **labdata - label string list
int size - label string list size
** HTS_Model setting function [#t0d05533]
*** HTS_Model_set_rate [#v6e9650b]
void HTS_Model_set_rate(HTS_Model *m, int i, double f);
- Use: set speaking rate for the i-th subword HMM.
- Arguments:
HTS_Model *m - HTS_Model list
int i - index of subword HMM to be used in HTS_Model list m
double f - speaking rate
- ''Attention!!:'' 0.2 <= f.
*** HTS_Model_set_dur [#jdfe0f95]
void HTS_Model_set_dur(Model *m, int i, int d);
- Use: set phone-level duration for the i-th subword HMM.
- Arguments:
HTS_Model *m - HTS_Model list
int i - index of subword HMM to be used in HTS_Model list m
int d - # of frames (duration)
- ''Attention!!:'' 0 < d.
*** HTS_Model_set_f0_level [#s5c8f765]
void HTS_Model_set_f0_level (Model *m, int i, double f);
- Use: set F0 level for the i-th subword HMM.
- Arguments:
HTS_Model *m - HTS_Model list
int i - index of subword HMM to be used in HTS_Model list m
double f - F0 bias
- ''Attention!!:'' 0.1 <= f.
*** HTS_Model_set_f0_range [#k1cb0d03]
void HTS_Model_set_f0_range(Model *m, int i, double f);
- Use: set F0 range for the i-th subword HMM.
- Arguments:
HTS_Model *m - HTS_Model list
int i - index of subword HMM to be used in HTS_Model list m
double f - F0 range
- ''Attention!!:'' 0.0 <= f. Default value is 0.0.
*** HTS_Model_set_volume [#b3110391]
void HTS_Model_set_volume(Model *m, int i, double f);
- Use: set volume for the i-th subword HMM.
- Arguments:
HTS_Model *m - HTS_Model list
int i - index of subword HMM to be used in HTS_Model list m
double f - volume
- ''Attention!!:'' 0.01 <= f.
*** HTS_Model_set_alpha [#idef33c4]
void HTS_Model_set_alpha(Model *m, int i, double f);
- Use: set frequency warping parameter alpha for the i-th subword HMM.
- Arguments:
HTS_Model *m - HTS_Model list
int i - index of subword HMM to be used in HTS_Model list m
double f - frequency warping parameter alpha
- ''Attention!!:'' 0.0 <= f.
** HTS_VocoderSet function [#i85cc130]
*** HTS_VocoderSet_initialize [#g7972a7d]
void HTS_VocoderSet_initialize (HTS_VocoderSet *vs, const int m,
const int rate, const int fperiod, int buff_size);
- Use: initialize the MLSA filter.
- Arguments:
HTS_VocodetSet *vs - HTS_VocodetSet structure
const int m - order of mel-cepstral coefficients
const int rate - sampling frequency (Hz)
const int fperiod - frame shift (point)
int buff_size - buffer size for direct audio output
*** HTS_VocoderSet_synthesize [#ded581f3]
void HTS_VocoderSet_synthesize (HTS_VocoderSet *vs, const int m,
double p, double *mc, double alpha, double beta,
FILE *wavfp, FILE *rawfp, short *rawdata);
- Use: run the MLSA filter and synthesize waveform.
- Arguments:
HTS_VocoderSet *vs - HTS_VocodetSet structure
const int m - order of mel-cepstral coefficients
double p - F0 value
double *mc - mel-cepstral coefficients
double alpha - frequency warping parameter alpha
double beta - postfiltering parameter beta
FILE *wavfp - file pointer to store synthesized waveform in RIFF format
FILE *rawfp - file pointer to store synthesized waveform in raw audio
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