dsps_wind_blackman_harris.h File Reference

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Functions
void	dsps_wind_blackman_harris_f32 (float *window, int len)
	Blackman-Harris window.

Function Documentation

dsps_wind_blackman_harris_f32()

void dsps_wind_blackman_harris_f32	(	float *	window,
		int	len )

Blackman-Harris window.

The function generates Blackman-Harris window.

Parameters

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

Definition at line 19 of file dsps_wind_blackman_harris_f32.c.

{
    const float a0 = 0.35875;
    const float a1 = 0.48829;
    const float a2 = 0.14128;
    const float a3 = 0.01168;
 
    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(), microphone_read_task(), and microphone_read_task().

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