National Instruments 320571-01 用户手册

Applies a flat top window to the input sequence
X.  If Y represents the output sequence
Flattop{X}, the elements of Y are obtained
using the formula:

y

i

  =  x

i

 [0.2810639 - 0.5208972 cos(w)

+ 0.1980399 cos(2w)]

for  i = 0, 1, 2, … , n-1

w  =  

2

π

i

n

  ,

where n is the number of elements in X.

X is a DSP Handle Cluster that indicates the memory buffer on the DSP board that contains the input
signal array.

Note: The operation is performed in place and the input array X is overwritten by the output

Flattop {X} is a DSP Handle Cluster that is identical to X, but with the results of Flattop {X} already
stored in the memory buffer on the DSP board.

error in (no error) contains the error information from a previous VI.  If an error occurs, it is passed out
error out and no other calls are made.

error out contains the error information for this call.