National Instruments Car Stereo System 320571-01 用户手册

Applies a general cosine window to the input
sequence X.  If A represents the Cosine
Coefficients input sequence and Y represents
the output sequence GenCos{X}, the elements
of Y are obtained using the formula:

y

i

  =  x

i

 

∑

k=0

m-1

 (-1)

k

 a

k

 cos (kw)

for  i = 0, 1, 2, … , n-1

w  =  

2

π

i

n

  ,

where n is the number of elements in X, and

m is the number of elements in Cosine Coefficients.

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

Cosine Coefficients is a DSP Handle Cluster that indicates the memory buffer on the DSP board that
contains the cosine coefficients.

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