dsps_wind_nuttall_f32.c File Reference

#include "dsps_wind_nuttall.h"
#include <math.h>

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Macros
#define	_USE_MATH_DEFINES

Functions
void	dsps_wind_nuttall_f32 (float *window, int len)
	Nuttall window.

Macro Definition Documentation

_USE_MATH_DEFINES

#define _USE_MATH_DEFINES

Definition at line 15 of file dsps_wind_nuttall_f32.c.

Function Documentation

dsps_wind_nuttall_f32()

void dsps_wind_nuttall_f32	(	float *	window,
		int	len )

Nuttall window.

The function generates Nuttall window.

Parameters

window	buffer to store window array.
len	length of the window array

Definition at line 19 of file dsps_wind_nuttall_f32.c.

{
    const float a0 = 0.355768;
    const float a1 = 0.487396;
    const float a2 = 0.144232;
    const float a3 = 0.012604;
 
    float len_mult = 1 / (float)(len - 1);
    for (int i = 0; i < len; i++) {
        window[i] = a0
                    - a1 * cosf(i * 2 * M_PI * len_mult)
                    + a2 * cosf(i * 4 * M_PI * len_mult)
                    - a3 * cosf(i * 6 * M_PI * len_mult);
    }
}

References M_PI.

Referenced by app_main().

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