dt_window.h File Reference

#include <stdlib.h>
#include <stdint.h>

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Typedefs
typedef struct x_dt_window *	dt_window
Enumerations
enum	te_dt_window_type { DT_HAMMING_WINDOW = 0, DT_HANNING_WINDOW, DT_BLACKMAN_WINDOW, DT_NUMBER_OF_WINDOWS }
Functions
dt_window	dt_window_create (te_dt_window_type type, uint32_t size)
	Pointer to an discrete time window object.
void	dt_window_destroy (dt_window *w)
	De-allocates the discrete time window object.
void	dt_window_apply (dt_window w, double *data)
	Applies a discrete time window to real waveform data.

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Typedef Documentation

typedef struct x_dt_window* dt_window

Definition at line 34 of file dt_window.h.

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Enumeration Type Documentation

enum te_dt_window_type

Enumerator:

DT_HAMMING_WINDOW
DT_HANNING_WINDOW
DT_BLACKMAN_WINDOW
DT_NUMBER_OF_WINDOWS

Definition at line 27 of file dt_window.h.

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Function Documentation

void dt_window_apply	(	dt_window	w,
		double *	data
	)

Applies a discrete time window to real waveform data.

See also:

dt_window_create

Parameters:

	w	pointer to discrete time window object.
	data	pointer to real array to apply discrete time window funtion to.

Definition at line 95 of file dt_window.c.

References x_dt_window::elements, and x_dt_window::size.

Referenced by fwin_apply_window(), fwin_reapply_window(), and morse_create_fft_amp_array().

dt_window dt_window_create	(	te_dt_window_type	type,
		uint32_t	size
	)

Pointer to an discrete time window object.

Used to limit FFT leakage.

Parameters:

	type	window function (hamming, hanning).
	size	the size of the window function, same as the audio packet data size.

Definition at line 75 of file dt_window.c.

References dt_window_compute(), x_dt_window::elements, NUMBER_OF_WINDOW_FUNCTIONS, x_dt_window::size, and x_dt_window::window_function.

Referenced by fwin_apply_window(), and morse_start_threads().

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void dt_window_destroy

(

dt_window *

w

)

De-allocates the discrete time window object.

See also:

dt_window_create

Definition at line 108 of file dt_window.c.

Referenced by free_all().