DSPLIB - Windowing

All the windowing functions currently supported by the DSP library.

Rectangular

These functions generate a rectangular window that fits in the output buffer.
The rectangular window filled the output buffer with 1.

Relative functions:

• dsp16_win_rect
• dsp32_win_rect

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Bartlett

Also known simply as the triangular windows, these functions generate a Bartlett window that fits in the output buffer.
The amplitude of the signal is in the range [0; 1]

Relative functions:

• dsp16_win_bart
• dsp32_win_bart

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Blackman

These functions generate a Blackman window that fits in the output buffer.
The amplitude of the signal is in the range [0; 1]

Relative functions:

• dsp16_win_black
• dsp32_win_black

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Hamming

These functions generate a hamming window that fits in the output buffer.
The amplitude of the signal is in the range [0; 1]

Relative functions:

• dsp16_win_hamm
• dsp32_win_hamm

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Gauss

These functions generate a Gaussian window that fits in the output buffer.
The amplitude of the signal is in the range [0; 1]

Note

You can change the value of the teta coefficient by defining DSP_GAUSS_TETA at the compilation with a value that fits in the range ]0; 0.5]

Relative functions:

• dsp16_win_gauss
• dsp32_win_gauss

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Hann

These functions generate a Hann window that fits in the output buffer.
The amplitude of the signal is in the range [0; 1]

Relative functions:

• dsp16_win_hann
• dsp32_win_hann

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Kaiser

These functions generate a kaiser window that fits in the output buffer.
The amplitude of the signal is in the range [0; 1]

Relative functions:

• dsp16_win_kaiser
• dsp32_win_kaiser

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Welch

These functions generate a Welch window that fits in the output buffer.
The Welch window is commonly used as a window for power spectral estimation.
The amplitude of the signal is in the range [0; 1]

Relative functions:

• dsp16_win_welch
• dsp32_win_welch

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Functions
void	dsp16_win_bart (dsp16_t *vect1, dsp16_t *vect2, int size)
	16-bit fixed point version of the Bartlett windowing function. More...
void	dsp16_win_black (dsp16_t *vect1, dsp16_t *vect2, int size)
	16-bit fixed point version of the Blackman windowing function. More...
void	dsp16_win_gauss (dsp16_t *vect1, dsp16_t *vect2, int size)
	16-bit fixed point version of the Gaussian windowing function. More...
void	dsp16_win_hamm (dsp16_t *vect1, dsp16_t *vect2, int size)
	16-bit fixed point version of the hamming windowing function. More...
void	dsp16_win_hann (dsp16_t *vect1, dsp16_t *vect2, int size)
	16-bit fixed point version of the Hann windowing function. More...
void	dsp16_win_kaiser (dsp16_t *vect1, dsp16_t *vect2, int size, int alpha)
	16-bit fixed point version of the kaiser windowing function. More...
void	dsp16_win_rect (dsp16_t *vect1, dsp16_t *vect2, int size)
	16-bit fixed point version of the rectangular windowing function. More...
void	dsp16_win_welch (dsp16_t *vect1, dsp16_t *vect2, int size)
	16-bit fixed point version of the Welch windowing function. More...
void	dsp32_win_bart (dsp32_t *vect1, dsp32_t *vect2, int size)
	32-bit fixed point version of the Bartlett windowing function. More...
void	dsp32_win_black (dsp32_t *vect1, dsp32_t *vect2, int size)
	32-bit fixed point version of the Blackman windowing function. More...
void	dsp32_win_gauss (dsp32_t *vect1, dsp32_t *vect2, int size)
	32-bit fixed point version of the Gaussian windowing function. More...
void	dsp32_win_hamm (dsp32_t *vect1, dsp32_t *vect2, int size)
	32-bit fixed point version of the hamming windowing function. More...
void	dsp32_win_hann (dsp32_t *vect1, dsp32_t *vect2, int size)
	32-bit fixed point version of the Hann windowing function. More...
void	dsp32_win_kaiser (dsp32_t *vect1, dsp32_t *vect2, int size, int alpha)
	32-bit fixed point version of the kaiser windowing function. More...
void	dsp32_win_rect (dsp32_t *vect1, dsp32_t *vect2, int size)
	32-bit fixed point version of the rectangular windowing function. More...
void	dsp32_win_welch (dsp32_t *vect1, dsp32_t *vect2, int size)
	32-bit fixed point version of the Welch windowing function. More...

void dsp16_win_bart	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size
	)

16-bit fixed point version of the Bartlett windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp16_op_mul(), DSP16_Q, i, and s.

void dsp16_win_black	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size
	)

16-bit fixed point version of the Blackman windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp16_op_cos(), dsp16_op_mul(), DSP16_Q, DSP16_QB, i, s, w, WIN_BLACK_A0, WIN_BLACK_A1, and WIN_BLACK_A2.

void dsp16_win_gauss	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size
	)

16-bit fixed point version of the Gaussian windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References CST_LN_2, dsp16_op_abs(), dsp16_op_exp(), dsp16_op_mul(), DSP16_Q, DSP16_QB, DSP_GAUSS_TETA, DSP_Q, i, s, and x.

void dsp16_win_hamm	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size
	)

16-bit fixed point version of the hamming windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp16_op_cos(), dsp16_op_mul(), DSP16_Q, DSP16_QB, i, s, w, WIN_HAMM_A0, and WIN_HAMM_A1.

Referenced by dsp_process_init().

void dsp16_win_hann	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size
	)

16-bit fixed point version of the Hann windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp16_op_cos(), dsp16_op_mul(), DSP16_Q, DSP16_QB, i, s, w, and WIN_HANN_A0.

void dsp16_win_kaiser	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size,
		int	alpha
	)

16-bit fixed point version of the kaiser windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.
alpha	The alpha coefficient which must be greater than 0.

References CST_PI, den, dsp16_op_kaiser_i0(), dsp16_op_mul(), DSP16_Q, DSP16_QB, dsp32_op_sqrt(), DSP32_QB, DSP_Q, n, num, and s.

void dsp16_win_rect	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size
	)

16-bit fixed point version of the rectangular windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

void dsp16_win_welch	(	dsp16_t *	vect1,
		dsp16_t *	vect2,
		int	size
	)

16-bit fixed point version of the Welch windowing function.

Parameters

vect1	A pointer on a 16-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 16-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp16_op_mul(), DSP16_Q, DSP16_QB, i, s, and w.

void dsp32_win_bart	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size
	)

32-bit fixed point version of the Bartlett windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp32_op_mul(), DSP32_Q, i, and s.

void dsp32_win_black	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size
	)

32-bit fixed point version of the Blackman windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp32_op_cos(), dsp32_op_mul(), DSP32_Q, DSP32_QB, i, s, temp64, w, WIN_BLACK_A0, WIN_BLACK_A1, and WIN_BLACK_A2.

void dsp32_win_gauss	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size
	)

32-bit fixed point version of the Gaussian windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References CST_LN_2, dsp32_op_abs(), dsp32_op_exp(), dsp32_op_mul(), DSP32_Q, DSP32_QB, DSP_GAUSS_TETA, i, s, and x.

void dsp32_win_hamm	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size
	)

32-bit fixed point version of the hamming windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp32_op_cos(), dsp32_op_mul(), DSP32_Q, DSP32_QB, i, s, w, WIN_HAMM_A0, and WIN_HAMM_A1.

void dsp32_win_hann	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size
	)

32-bit fixed point version of the Hann windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp32_op_cos(), dsp32_op_mul(), DSP32_Q, DSP32_QB, i, s, w, and WIN_HANN_A0.

void dsp32_win_kaiser	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size,
		int	alpha
	)

32-bit fixed point version of the kaiser windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.
alpha	The alpha coefficient which must be greater than 0.

References CST_PI, den, dsp32_op_kaiser_i0(), dsp32_op_mul(), dsp32_op_sqrt(), DSP32_Q, DSP32_QB, n, num, s, and temp64.

void dsp32_win_rect	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size
	)

32-bit fixed point version of the rectangular windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

void dsp32_win_welch	(	dsp32_t *	vect1,
		dsp32_t *	vect2,
		int	size
	)

32-bit fixed point version of the Welch windowing function.

Parameters

vect1	A pointer on a 32-bit real vector that will contain the window multiplied by vect2.
vect2	A pointer on a 32-bit real vector that contains the signal on which the window should apply.
size	The size of the output buffer.

References dsp32_op_mul(), DSP32_Q, DSP32_QB, i, s, and w.