Texas Instruments C28 Series - Inverse Absolute Value of an Even Length Complex Vector

Function Descriptions
3.22 Inverse Absolute Value of an Even Length Complex Vector
Description:
This module calculates the inverse absolute value of an even length complex vector.
Y [i] =
1
p
(X
re
[i]
2
+ X
im
[i]
2
)
Header File:
FPU.h
Declaration:
void iabs_SP_CV_2(float32
*
y, const complex_float
*
x, const Uint16 N)
Usage:
iabs_SP_CV_2(y, x, N);
float32 *y
output array
complex_float *x
input complex array
Uint16 N
length of x and y arrays (must be even)
The type “complex_float” is defined as
typedef struct{
float32 dat[2];
}complex_float;
Element dat[0] is the real part, dat[1] is the imaginary part.
Alignment Requirements:
None
Notes:
1. N must be EVEN
Example:
#include "FPU.h"
#define N 4
float32 y[N];
complex_float x[N];
main()
{
iabs_SP_CV_2(y, x, N); // inverse complex absolute value
}
Benchmark Information:
Number of Cycles = 15*N + 22 cycles (including the call and return)
Sep 10, 2012 55