#include <feature-window.h>

Collaboration diagram for FeatureWindowFunction:

Public Member Functions
	FeatureWindowFunction ()

	FeatureWindowFunction (const FrameExtractionOptions &opts)

	FeatureWindowFunction (const FeatureWindowFunction &other)

Public Attributes
Vector< BaseFloat >	window

Detailed Description

Definition at line 119 of file feature-window.h.

Constructor & Destructor Documentation

◆ FeatureWindowFunction() [1/3]

FeatureWindowFunction ( )

inline

Definition at line 120 of file feature-window.h.

120 {}

◆ FeatureWindowFunction() [2/3]

FeatureWindowFunction ( const FrameExtractionOptions & opts )

explicit

Definition at line 109 of file feature-window.cc.

References FrameExtractionOptions::blackman_coeff, rnnlm::i, KALDI_ASSERT, KALDI_ERR, M_2PI, FeatureWindowFunction::window, FrameExtractionOptions::window_type, and FrameExtractionOptions::WindowSize().

                                                                                {
   int32 frame_length = opts.WindowSize();
   KALDI_ASSERT(frame_length > 0);
   window.Resize(frame_length);
   double a = M_2PI / (frame_length-1);
   for (int32 i = 0; i < frame_length; i++) {
     double i_fl = static_cast<double>(i);
     if (opts.window_type == "hanning") {
       window(i) = 0.5  - 0.5*cos(a * i_fl);
     } else if (opts.window_type == "sine") {
       // when you are checking ws wikipedia, please
       // note that 0.5 * a = M_PI/(frame_length-1)
       window(i) = sin(0.5 * a * i_fl);
     } else if (opts.window_type == "hamming") {
       window(i) = 0.54 - 0.46*cos(a * i_fl);
     } else if (opts.window_type == "povey") {  // like hamming but goes to zero at edges.
       window(i) = pow(0.5 - 0.5*cos(a * i_fl), 0.85);
     } else if (opts.window_type == "rectangular") {
       window(i) = 1.0;
     } else if (opts.window_type == "blackman") {
       window(i) = opts.blackman_coeff - 0.5*cos(a * i_fl) +
         (0.5 - opts.blackman_coeff) * cos(2 * a * i_fl);
     } else {
       KALDI_ERR << "Invalid window type " << opts.window_type;
     }
   }
 }