Analog Devices VISUALDSP++ 3.5 Manual page 485

gen_harris
generate harris window
Synopsis
#include <window.h>
void gen_harris_fr16(w,a,N)
fract16 w[];
int a;
int N;
Description
This function generates a vector containing the Harris window. The
length of the window required is specified by the parameter
stride parameter
vector . The length of the output vector should therefore be
w
window is also known as the Blackman-Harris window.
Algorithm
= −
w [ n ] . 0 35875 . 0
where n = {0, 1, 2, ..., N-1}
Domain
a > 0; N > 0
VisualDSP++ 3.5 C/C++ Compiler and Library Manual
for ADSP-219x DSPs
/* Window vector
/* Address stride in samples for window vector */
/* Length of window vector
is used to space the window values within the output
a
π
 2 n 
+
48829 * cos   . 0 14128
−
N 1
 
DSP Run-Time Library
π
 4 n 
−
* cos   . 0 01168 *
−
N 1
 
*/
*/
, and the
N
. This
N*a
π
 6 n 
cos  
−
N 1
 
4-69