window.h File Reference

Windowing functions (Blackman, Hamming, Hann, Bartlett, rectangular). More...

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Macros
#define	WIN_BLACKMAN_A0_Q15   Q_CONVERT_FLOAT(7938.0 / 18608.0, 15) /* For "exact" blackman 16bit */
#define	WIN_BLACKMAN_A0_Q31   Q_CONVERT_FLOAT(7938.0 / 18608.0, 31) /* For "exact" blackman 32bit */

Functions
void	win_rectangular_16b (int16_t win[], int length)
	Returns a rectangular window with 16 bits, simply a values of ones vector.
void	win_rectangular_32b (int32_t win[], int length)
	Returns a rectangular window with 32 bits, simply a values of ones vector.
void	win_blackman_16b (int16_t win[], int length, int16_t a0)
	Calculates a Blackman window function with 16 bits, reference https://en.wikipedia.org/wiki/Window_function#Blackman_window.
void	win_blackman_32b (int32_t win[], int length, int32_t a0)
	Calculates a Blackman window function with 32 bits, reference https://en.wikipedia.org/wiki/Window_function#Blackman_window.
void	win_hann_16b (int16_t win[], int length)
	Calculates a Hann window function with 16 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.
void	win_hann_32b (int32_t win[], int length)
	Calculates a Hann window function with 32 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.
void	win_hamming_16b (int16_t win[], int length)
	Calculates a Hamming window function with 16 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.
void	win_hamming_32b (int32_t win[], int length)
	Calculates a Hamming window function with 32 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.
void	win_povey_16b (int16_t win[], int length)
	Calculates a Povey window function with 16 bits.

Detailed Description

Windowing functions (Blackman, Hamming, Hann, Bartlett, rectangular).

Macro Definition Documentation

WIN_BLACKMAN_A0_Q15

#define WIN_BLACKMAN_A0_Q15   Q_CONVERT_FLOAT(7938.0 / 18608.0, 15) /* For "exact" blackman 16bit */

WIN_BLACKMAN_A0_Q31

#define WIN_BLACKMAN_A0_Q31   Q_CONVERT_FLOAT(7938.0 / 18608.0, 31) /* For "exact" blackman 32bit */

Function Documentation

win_blackman_16b()

void win_blackman_16b	(	int16_t	win[],
		int	length,
		int16_t	a0
	)

Calculates a Blackman window function with 16 bits, reference https://en.wikipedia.org/wiki/Window_function#Blackman_window.

Parameters

win	Pointer to output vector with Q1.15 coefficients
length	Length of coefficients vector
a0	Parameter for window shape, use e.g. 0.42 as Q1.15

win_blackman_32b()

void win_blackman_32b	(	int32_t	win[],
		int	length,
		int32_t	a0
	)

Calculates a Blackman window function with 32 bits, reference https://en.wikipedia.org/wiki/Window_function#Blackman_window.

Parameters

win	Pointer to output vector with Q1.31 coefficients
length	Length of coefficients vector
a0	Parameter for window shape, use e.g. 0.42 as Q1.31

win_hamming_16b()

void win_hamming_16b	(	int16_t	win[],
		int	length
	)

Calculates a Hamming window function with 16 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.

Parameters

win	Pointer to output vector with Q1.15 coefficients
length	Length of coefficients vector

win_hamming_32b()

void win_hamming_32b	(	int32_t	win[],
		int	length
	)

Calculates a Hamming window function with 32 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.

Parameters

win	Pointer to output vector with Q1.31 coefficients
length	Length of coefficients vector

win_hann_16b()

void win_hann_16b	(	int16_t	win[],
		int	length
	)

Calculates a Hann window function with 16 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.

Parameters

win	Pointer to output vector with Q1.15 coefficients
length	Length of coefficients vector

win_hann_32b()

void win_hann_32b	(	int32_t	win[],
		int	length
	)

Calculates a Hann window function with 32 bits, reference https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows.

Parameters

win	Pointer to output vector with Q1.31 coefficients
length	Length of coefficients vector

win_povey_16b()

void win_povey_16b	(	int16_t	win[],
		int	length
	)

Calculates a Povey window function with 16 bits.

It's a window function used in Pytorch and Kaldi.

Parameters

win	Output vector with coefficients
length	Length of coefficients vector

win_rectangular_16b()

void win_rectangular_16b	(	int16_t	win[],
		int	length
	)

Returns a rectangular window with 16 bits, simply a values of ones vector.

Parameters

win	Pointer to output vector with Q1.15 coefficients
length	Length of coefficients vector

win_rectangular_32b()

void win_rectangular_32b	(	int32_t	win[],
		int	length
	)

Returns a rectangular window with 32 bits, simply a values of ones vector.

Parameters

win	Pointer to output vector with Q1.31 coefficients
length	Length of coefficients vector