//[[HTS_engine_API_english]]
 
 #contents
 
 * 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)
 
 - Boolean definition (HTS_Boolean)
  TRUE
  FALSE
 
 * Engine structures [#z44fc354]
 
 ** Model [#le7d813d]
 
 *** HTS_Window [#zb4a3381]
 - Window coefficients to calculate dynamic features.
  int size             - # of windows (static + deltas)
  int *l_width         - left width of windows
  int *r_width         - right width of windows
  double **coefficient - window coefficients
  int max_width        - maximum width of windows
 
 *** HTS_Pattern [#k48e4d9f]
 - List of patterns in a question and a tree.
  char *string      - pattern string
  HTS_Pattern *next - pointer to the next pattern
 
 *** HTS_Question [#z77715ac]
 - List of questions in a tree.
  char *name         - name of this question
  HTS_Pattern *head  - pointer to the head of pattern list
  HTS_Question *next - pointer to the next question
 
 *** HTS_Node [#c82cbc05]
 - List of tree nodes in a tree.
  int index           - index of this node
  int pdf             - index of PDF for this node (leaf node only)
  HTS_Node *yes       - pointer to its child node (yes)
  HTS_Node *no        - pointer to its child node (no)
  HTS_Node *next      - pointer to the next node
  HTS_Question *quest - question applied at this node
 
 *** HTS_Tree [#tccac793]
 - List of decision trees in a model.
  HTS_Pattern *head - pointer to the head of pattern list for this tree
  HTS_Tree *next    - pointer to the next tree
  HTS_Node *root    - root node of this tree
  int state         - state index of this tree
 
 *** HTS_Model [#lb0795d7]
 - Set of PDFs, decision trees and questions.
  int vector_length      - vector length (include static and dynamic features)
  int *npdf              - # of PDFs at each tree
  double ***pdf          - PDFs
  HTS_Tree *tree         - pointer to the list of trees
  HTS_Question *question - pointer to the list of questions
 
 *** HTS_Stream [#e8ebe6f1]
 - Set of models and a window.
  int vector_length        - vector_length (include static and dynamic features)
  HTS_Model *model         - models
  HTS_DynamicWindow window - window coefficients
  HTS_Boolean msd_flag     - flag for MSD
  int interpolation_size   - # of models for interpolation
 
 *** HTS_ModelSet [#n0021e72]
 - Set of duration models, HMMs and GV models.
  HTS_Stream duration - duration PDFs and trees
  HTS_Stream *stream  - parameter PDFs, trees and windows
  HTS_Stream *gv      - GV PDFs
  int nstate          - # of HMM states
  int nstream         - # of stream
 
 ** Label [#zdbf97c6]
 
 *** HTS_LabelString [#k2bc37e0]
 - Individual label string with time infomation.
  HTS_LabelString *next  - pointer to the next label string
  char *name             - label string
  HTS_Boolean frame_flag - flag for frame length modification
  int frame              - frame length specified in the given label
 
 *** HTS_Label [#cf3de27c]
 - List of label strings.
  HTS_LabelString *head - pointer to the head of label string
  int size              - # of label strings
  double speech_speed   - speech speed rate
 
 ** State stream [#p6180dbc]
 
 *** HTS_SStream [#g80be9f5]
 - Individual state stream.
  int vector_length        - vector length (include static and dynamic features)
  double **mean            - mean vector sequence
  double **vari            - variance vector sequence
  double *msd              - MSD parameter sequence
  int win_size             - # of windows (static + deltas)
  int *win_l_width         - left width of windows
  int *win_r_width         - right width of windows
  double **win_coefficient - window coefficients
  int win_max_width        - maximum width of windows
  double *gv_mean          - mean vector of GV
  double *gv_vari          - variance vector of GV
 
 *** HTS_SStreamSet [#c7e181ed]
 - Set of state stream.
  HTS_SStream *sstream - state streams
  int nstream          - # of streams
  int nstate           - # of states
  int *duration        - duration sequence
  int total_state      - total state
  int total_frame      - total frame
 
 ** PDF stream [#fbcf0b4b]
 
 *** HTS_SMatrices [#n16e4df2]
 - Matrices/Vectors used in the speech parameter generation algorithm.
  double **mean - mean vector sequence
  double **ivar - 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 [#v2504efe]
 - Individual PDF stream.
  int vector_length        - vector length (include static and dynamic features)
  int static_length        - static features length
  int length               - stream length
  int width                - width of dynamic window
  double **par             - output parameter vector
  HTS_SMatrices sm         - matrices for parameter generation
  int win_size             - # of windows (static + deltas)
  int *win_l_width         - left width of windows
  int *win_r_width         - right width of windows
  double **win_coefficient - window coefficients
  HTS_Boolean *msd_flag    - Boolean sequence for MSD
  double *gv_buff          - buffer for GV calculation
  double *gv_mean          - mean vector of GV
  double *gv_vari          - variance vector of GV
  double gv_weight         - GV weight
 
 *** HTS_PStreamSet [#fc667ac9]
 - Set of PDF streams.
  HTS_PStream *pstream - PDF streams
  int nstream          - # of PDF streams
  int total_frame      - total frame
 
 ** Generated parameter stream [#cb40623b]
 
 *** HTS_GStream [#r1f0e0dc]
 - Generated parameter stream.
  int static_length - static features length
  double **par      - generated parameter
 
 *** HTS_GStreamSet [#qab80b0e]
 - Set of generated parameter stream.
  int total_nsample    - total sample
  int total_frame      - total frame
  int nstream          - # of streams
  HTS_GStream *gstream - generated parameter streams
  short *gspeech       - generated speech
 
 ** Engine [#j629fb64]
 
 *** HTS_Global [#x0a5815e]
 - Global settings.
  int stage                - Gamma=-1/stage : if stage=0 then Gamma=0
  HTS_Boolean use_log_gain - log gain flag (for LSP)
  int sampling_rate        - sampling rate
  int fperiod              - frame period
  double alpha             - all-pass constant
  double beta              - postfiltering coefficient
  int audio_buff_size      - audio buffer size (for audio device)
  double *msd_threshold    - MSD thresholds
  double *duration_iw      - weights for duration interpolation
  double **parameter_iw    - weights for parameter interpolation
  double **gv_iw           - weights for GV interpolation
  double *gv_weight        - GV weights
 
 *** HTS_Engine [#wa56bd53]
 - Engine itself.
  HTS_Global global  - global settings
  HTS_ModelSet ms    - set of duration models, HMMs and GV models
  HTS_Label label    - label
  HTS_SStreamSet sss - set of state streams
  HTS_PStreamSet pss - set of PDF streams
  HTS_GStreamSet gss - set of generated parameter streams
 
 * Vocoder structures [#gc6a2eb8]
 
 ** Audio [#i33a0fbe]
 
 *** HTS_Audio [#se4ce25f]
 - 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
 
 ** Vocoder [#lbf2a363]
 
 *** HTS_Vocoder [#p4d69001]
 - MLSA/MGLSA filter settings.
  int stage                  - Gamma=-1/stage : if stage=0 then Gamma=0
  double gamma               - Gamma
  HTS_Boolean use_log_gain   - log gain flag (for LSP)
  int fprd                   - frame shift
  int iprd                   - interpolation period
  int seed                   - seed of random generator
  unsigned long next         - temporary variable for random generator
  HTS_Boolean gauss          - flag to use Gaussian noise
  double rate                - sampling rate
  double p1                  - used in excitation generation
  double pc                  - used in excitation generation
  double p                   - used in excitation generation
  double p                   - used in excitation generation
  double inc                 - used in excitation generation
  int sw                     - switch used in random generator
  int x                      - excitation signal
  HTS_Audio *audio           - pointer for audio device
  double *freqt_buff         - used in freqt
  int freqt_size             - buffer size for freqt
  double *spectrum2en_buff   - used in spectrum2en
  int spectrum2en_size       - buffer size for spectrum2en
  double r1, r2, s           - used in random generator
  double *postfilter_buff    - used in postfiltering
  int postfilter_size        - buffer size for postfiltering
  double *c, *cc, *cinc, *d1 - used in the MLSA/MGLSA filter
  double *pade               - used in mlsadf
  double *lsp2lpc_buff       - used in lsp2lpc
  int lsp2lpc_size           - buffer size of lsp2lpc
  double *gc2gc_buff         - used in gc2gc
  int gc2gc_size             - buffer size for gc2gc
 
 * Engine functions [#l74e4110]
 
 ** Initialize engine [#t310270e]
 
 *** HTS_Engine_initialize [#ec43b3cc]
  void HTS_Engine_initialize(HTS_Engine *engine, int nstream)
 - Use: Initialize engine.
 - Arguments: 
  HTS_Engine *engine - pointer to HTS_Engine structure
 - ''Attention!!:'' To start engine, first you must call this function.
 
 ** Load models [#z7b8be60]
 
 *** HTS_Engine_load_duration_from_fn [#va73cd1a]
  void HTS_Engine_load_duration_from_fn(HTS_Engine *engine, char **pdf_fn, char **tree_fn, int interpolation_size)
 - Use: Load duration PDFs and trees from files using given file names.
 - Arguments:
  HTS_Engine *engine     - pointer to HTS_Engine structure
  char **pdf_fn          - duration PDF file names
  char **tree_fn         - duration tree file names
  int interpolation_size - # of duration models to be interpolated
 - ''Attention!!'': You must initialize variable '''engine''' using HTS_Engine_initialize before calling this function.
 
 *** HTS_Engine_load_duration_from_fp [#wc2481e3]
  void HTS_Engine_load_duration_from_fp(HTS_Engine *engine, FILE **pdf_fp, FILE **tree_fp, int interpolation_size)
 - Use: load duration PDFs and trees from files using given file pointers.
 - Arguments:
  HTS_Engine *engine     - pointer to HTS_Engine structure
  FILE **pdf_fp          - duration PDF file pointers
  FILE **tree_fp         - duration tree file pointers
  int interpolation_size - # of duration models to be interpolated
 - ''Attention!!'': You must initialize variable '''engine''' using HTS_Engine_initialize before calling this function.
 
 *** HTS_Engine_load_parameter_from_fn [#kd48cfd2]
  void HTS_Engine_load_parameter_from_fn(HTS_Engine *engine, char **pdf_fn, char **tree_fn, char **win_fn,
                                         int stream_index, HTS_Boolean msd_flag, int window_size, int interpolation_size)
 - Use: load parameter PDFs, trees and windows from files using given file names.
 - Arguments:
  HTS_Engine *engine     - pointer to HTS_Engine structure
  char **pdf_fn          - parameter PDF file pointers
  char **tree_fn         - parameter tree file pointers
  char **win_fn          - parameter window file pointers
  int stream_index       - index of stream
  HTS_Boolean msd_flag   - flag for MSD
  int window_size        - # of windows
  int interpolation_size - # of parameter models to be interpolated
 - ''Attention!!'': You must load duration models using HTS_Engine_load_duration_from_fn/fp before calling this function.
 
 *** HTS_Engine_load_parameter_from_fp [#j2b19c02]
  void HTS_Engine_load_parameter_from_fp(HTS_Engine *engine, FILE **pdf_fp, FILE **tree_fp, FILE **win_fp,
                                         int stream_index, HTS_Boolean msd_flag, int window_size, int interpolation_size)
 - Use: load parameter PDFs, trees and windows from files using given file pointers.
 - Arguments:
  HTS_Engine *engine     - pointer to HTS_Engine structure
  FILE **pdf_fp          - parameter PDF file pointers
  FILE **tree_fp         - parameter tree file pointers
  FILE **win_fp          - parameter window file pointers
  int stream_index       - index of stream
  HTS_Boolean msd_flag   - MSD flag
  int window_size        - # of windows
  int interpolation_size - # of parameter models to be interpolated
 - ''Attention!!'': You must load duration models using HTS_Engine_load_duration_from_fn/fp before calling this function.
 
 *** HTS_Engine_load_gv_from_fn [#id008a1a]
  void HTS_Engine_load_gv_from_fn(HTS_Engine *engine, char **pdf_fn, int stream_index, int interpolation_size)
 - Arguments:
  HTS_Engine *engine     - pointer to HTS_Engine structure
  char **pdf_fn          - GV PDF file names
  int stream_index       - index of streams
  int interpolation_size - # of GV models to be interpolated
 - ''Attention!!'': You must load parameter models using HTS_Engine_load_parameter_from_fn/fp before calling this function.
 
 *** HTS_Engine_load_gv_from_fp [#g6d9d662]
  void HTS_Engine_load_gv_from_fp(HTS_Engine *engine, FILE **pdf_fp, int stream_index, int interpolation_size)
 - Arguments:
  HTS_Engine *engine     - pointer to HTS_Engine structure
  FILE **pdf_fn          - GV PDF file pointers
  int stream_index       - index of streams
  int interpolation_size - # of GV models to be interpolated
 - ''Attention!!'': You must load parameter models using HTS_Engine_load_parameter_from_fn/fp before calling this function.
 
 ** Set parameter [#b8dd5d39]
 
 *** 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 - pointer to HTS_Engine structure
  int i              - sampling frequency (Hz), 1= < 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 - pointer to HTS_Engine structure
  int i              - frame shift (point), 1= < 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 - pointer to HTS_Engine structure
  double f           - alpha, 0.0 <= f <= 1.0
 - ''Attention!!:'' Default value is 0.42.
 
 *** HTS_Engine_set_gamma [#wdc30080]
  void HTS_engine_set_gamma(HTS_Engine *engine,int i)
 - Use: set Gamma.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  int i              - Gamma=-1/i : if i=0 then Gamma=0, 0 <= i
 - ''Attention!!:'' Default value is 0.
 
 *** HTS_Engine_use_log_gain [#lfbc8c63]
  void HTS_Engine_set_log_gain(HTS_Engine *engine,HTS_Boolean i)
 - Use: set log gain flag.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  HTS_Boolean i      - log gain flag.
 - ''Attention!!:'' Default value is FALSE.
 
 *** HTS_Engine_set_beta [#m44c517c]
  void HTS_SetBeta(HTS_Engine *engine,double f)
 - Use: set postfiltering coefficient parameter beta.
 - Arguments:
  HTS_Engine *engine - pointer to 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_audio_buff_size [#ua56725a]
  void HTS_Engine_set_audio_buff_size(HTS_Engine *engine, int i)
 - Use: set buffer size for direct audio output.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  int i              - buffer size (sample), 0 <= i <= 48000
 - ''Attention!!:'' Default value is 0. If i=0, direct audio play is turned off.
 
 *** HTS_Engine_set_msd_threshold [#qd019ba4]
  void HTS_Engine_set_msd_threshold(HTS_Engine *engine, int stream_index, double f)
 - Use: set MSD threshold.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  int stream_index   - index of streams
  double f           - threshold
 
 *** HTS_Engine_set_duration_interpolation_weight [#rdd5ff69]
  void HTS_Engine_set_duration_interpolation_weight(HTS_Engine *engine, int interpolation_index, double f)
 - Use: set weight for duration interpolation.
 - Arguments:
  HTS_Engine *engine      - pointer to HTS_Engine structure
  int interpolation_index - index of duration models
  double f                - interpolation weight
 
 *** HTS_Engine_set_parameter_interpolation_weight [#k8bc0ee3]
  void HTS_Engine_set_parameter_interpolation_weight(HTS_Engine *engine, int stream_index, int interpolation_index, double f)
 - Use: set weight for parameter interpolation.
 - Arguments:
  HTS_Engine *engine      - pointer to HTS_Engine structure
  int stream_index        - index of streams
  int interpolation_index - index of parameter models
  double f                - interpolation weight
 
 *** HTS_Engine_set_gv_interpolation_weight [#lc3e00bc]
  void HTS_Engine_set_gv_interpolation_weight(HTS_Engine *engine, int stream_index, int interpolation_index, double f)
 - Use: set weight for GV interpolation.
 - Arguments:
  HTS_Engine *engine      - pointer to HTS_Engine structure
  int stream_index        - index of streams
  int interpolation_index - index of GV models
  double f                - interpolation weight
 
 *** HTS_Engine_set_gv_weight [#eaa46840]
  void HTS_Engine_set_gv_weight(HTS_Engine *engine, int stream_index, double f)
 - Use: set GV weight.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  int stream_index   - index of streams
  double f           - GV weight
 
 ** Synthesize speech [#sf7321ed]
 
 *** HTS_Engine_load_label_from_fn [#j87fa620]
  void HTS_Engine_load_label_from_fn(HTS_Engine *engine, char *fn)
 - Use: load label from file using given file name.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  char *fn           - label file name
 
 *** HTS_Engine_load_label_from_fp [#i892f523]
  void HTS_Engine_load_label_from_fp(HTS_Engine *engine, FILE *fp)
 - Use: load label from file using given file pointer.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  FILE *fp           - label file pointer
 
 *** HTS_Engine_load_label_from_string [#q36e8c4c]
  void HTS_Engine_load_label_from_string(HTS_Engine *engine, char *data)
 - Use: load label from string.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  char *data         - label string
 
 *** HTS_Engine_load_label_from_string_list [#i9e769ac]
  void HTS_Engine_load_label_from_string_list(HTS_Engine *engine, char **data, int size)
 - Use: load label from string list.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  char **data        - label string list
  int size           - size of label string list
 
 *** HTS_Engine_create_sstream [#c2e0aaed]
  void HTS_Engine_create_sstream(HTS_Engine *engine)
 - Use: parse label, determine state duration and create state stream.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
 
 *** HTS_Engine_create_pstream [#b1fda60c]
  void HTS_Engine_create_pstream(HTS_Engine *engine)
 - Use: create PDF stream using state stream.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
 
 *** HTS_Engine_create_gstream [#fab90e37]
  void HTS_Engine_create_gstream(HTS_Engine *engine)
 - Use: synthesis speech and store generated parameter using PDF stream.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
 - ''Attention!!:'' To synthesize speech, you must set stream[0]=spectrum models and spectrum[1]=lf0 models.
 
 *** HTS_Engine_save_infomation [#e7c9463d]
  void HTS_Engine_save_infomation(HTS_Engine *engine, FILE *fp)
 - Use: output trace infomation.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  FILE *fp           - output file pointer
 
 *** HTS_Engine_save_label [#sb2d1f59]
  void HTS_Engine_save_label(HTS_Engine *engine, FILE *fp)
 - Use: output label with time.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  FILE *fp           - output file pointer
 
 *** HTS_Engine_save_generated_parameter [#ya641edd]
  void HTS_Engine_save_generated_parameter(HTS_Engine *engine, FILE *fp)
 - Use: output generated parameter.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  FILE *fp           - output file pointer
 
 *** HTS_Engine_save_generated_speech [#k8327b8d]
  void HTS_Engine_save_generated_speech(HTS_Engine *engine, FILE *fp)
 - Use: output generated speech.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  FILE *fp           - output file pointer
 
 *** HTS_Engine_save_riff [#wb9640f7]
  void HTS_Engine_save_riff(HTS_Engine *engine, FILE *fp)
 - Use: output riff format file.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
  FILE *fp           - output file pointer
 
 *** HTS_Engine_refresh [#a8a1a225]
  void HTS_Engine_refresh(HTS_Engine *engine)
 - Use: free label, state streams, PDF streams and generated parameter streams.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
 
 ** Free engine [#mef9b660]
 
 *** HTS_Engine_clear [#gd323729]
  void HTS_Engine_clear(HTS_Engine *engine)
 - Use: free engine.
 - Arguments:
  HTS_Engine *engine - pointer to HTS_Engine structure
 
 * Vocoder functions [#tffbab44]
 
 ** Initialize vocoder [#v5bc81e4]
 
 *** HTS_Vocoder_initialize [#ff9170fc]
  void HTS_Vocoder_initialize(HTS_Vocoder *v, const int m, const int stage, HTS_Boolean use_log_gain, const int rate, const int fperiod, int buff_size)
 - Use: initialize the vocoder.
 - Arguments:
  HTS_Vocoder *v           - pointer to HTS_Vocoder structure
  int m                    - order of mel-cepstral coefficients
  int stage                - Gamma=-1/stage : if stage=0 then Gamma=0
  HTS_Boolean use_log_gain - log gain flag
  int rate                 - sampling frequency
  int fperiod              - frame shift
  int buff_size            - buffer size for direct audio output
 
 ** Synthesize speech [#d6645d7f]
 
 *** HTS_Vocoder_synthesize [#h737ba80]
  void HTS_Vocoder_synthesize(HTS_Vocoder *v, const int m, double lf0, double *spectrum, double alpha, double beta, short *rawdata)
 - Use: run the vocoder and synthesize waveform.
 - Arguments:
  HTS_Vocoder *v   - HTS_Vocoder structure pointer
  int m            - order of spectrum coefficients
  double lf0       - log F0 value
  double *spectrum - spectrum coefficients
  double alpha     - frequency warping parameter alpha
  double beta      - postfiltering parameter beta
  short *rawdata   - short pointer to store synthesized waveform
 
 *** HTS_Vocoder_postfilter_mcp [#r92930b7]
  void HTS_Vocoder_postfilter_mcp(HTS_Vocoder *v, double *mcp, const int m, double alpha, double beta)
 - Use: postfilter for mel-cepstrum.
 - Arguments:
  HTS_Vocoder *v - HTS_Vocoder structure pointer
  double *mcp    - spectrum coefficients
  int m          - order of mel-cepstral coefficients
  double alpha   - frequency warping parameter alpha
  double beta    - postfiltering parameter beta
 
 ** Free vocoder [#rb2ef784]
 
 *** HTS_Vocoder_clear [#wb420be0]
  void HTS_Vocoder_clear(HTS_Vocoder *v)
 - Use: free the vocoder.
 - Arguments:
  HTS_Vocoder *v - pointer to HTS_Vocoder structure
 
 * Other functions [#q32f7c6d]
 
 ** For copyright [#e99f219b]
 
 *** void HTS_show_copyright(FILE *fp) [#y30d6252]
 - Use: show hts_engine_API copyright.
 - Arguments:
  FILE *fp - output file pointer
 
 *** void HTS_get_copyright(char *str) [#d24078ea]
 - Use: copy hts_engine_API copyright to string.
 - Arguments:
  char *str - output string

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