lasp/cpp_src/dsp/lasp_window.h

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#pragma once
#include "lasp_mathtypes.h"
/**
* @brief Window (aka taper) functions of a certain type
*/
class Window {
public:
enum class WindowType {
Hann = 0,
Hamming = 1,
Rectangular = 2,
Bartlett = 3,
Blackman = 4,
};
/**
* @brief Convert a window type enum to its equivalent text.
*
* @param wt The window type to convert
*
* @return Text string
*/
static std::string toText(const WindowType wt) {
switch(wt) {
case(WindowType::Hann): {
return "Hann";
}
break;
case(WindowType::Hamming): {
return "Hamming";
}
break;
case(WindowType::Rectangular): {
return "Rectangular";
}
break;
case(WindowType::Bartlett): {
return "Bartlett";
}
break;
case(WindowType::Blackman): {
return "Blackman";
}
break;
}
throw std::runtime_error("Not implemenented window type");
}
/**
* @brief Dispatcher: create a window based on enum type and len
*
* @param w Window type
* @param len Length of the window (typically, integer power of two).
*
* @return Window vector of values
*/
static vd create(const WindowType w,const us len);
/**
* @brief Hann window
*
* @param len Length of the window (typically, integer power of two).
*
* @return vector of values
*/
static vd hann(const us len);
/**
* @brief Hamming window
*
* @param len Length of the window (typically, integer power of two).
*
* @return vector of values
*/
static vd hamming(const us len);
/**
* @brief Rectangular (boxcar) window.
*
* @param len Length of the window (typically, integer power of two).
*
* @return vector of values
*/
static vd rectangular(const us len);
/**
* @brief Bartlett window.
*
* @param len Length of the window (typically, integer power of two).
*
* @return vector of values
*/
static vd bartlett(const us len);
/**
* @brief Blackman window.
*
* @param len Length of the window (typically, integer power of two).
*
* @return vector of values
*/
static vd blackman(const us len);
};