National Instruments Car Stereo System 320571-01 用户手册

Applies a Kaiser-Bessel window to the
input sequence X.  If Y represents the
output sequence Kaiser-Bessel{X}, the
elements of Y are obtained using the
formula:

y

i

 = x

i

 

I

o

β

1. 0 - a

2









I

o

β

( )

for  i = 0, 1, 2, … n - 1

a  =  

i - k

k

k  =  

n-1

2

  ,

where n is the number of elements in X, and

Io(•)  is the zeroth-order modified Bessel function.

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

beta is proportional to the sidelobe attenuation–that is, the larger beta is, the greater the sidelobe
attenuation is.  beta defaults to 0.0.

Kaiser-Bessel {X} is a DSP Handle Cluster that is identical to X, but with the results of
Kaiser-Bessel {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.