National Instruments Car Stereo System 320571-01 User Manual
Chapter 2
NI-DSP Analysis VI Reference
NI-DSP SRM for LabVIEW for Windows
2-33
Part 3: NI-DSP Function Reference
DSP Flat Top Window
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:
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.
signal array.
Note: The operation is performed in place and the input array X is overwritten by the output
Flattop {X}.
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.
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 and no other calls are made.
error out contains the error information for this call.