National Instruments Car Stereo System 320571-01 用户手册

Computes the Fast Fourier transform of
the complex input sequence X.  If Y
represents the complex output sequence,
then:

Y  =  F{X}.

Re{X} is a DSP Handle Cluster that indicates the memory buffer on the DSP board that contains the real
part of the input signal array X.

Im{X} is a DSP Handle Cluster that indicates the memory buffer on the DSP board that contains the
imaginary part of input signal array X.

Notes: The number of elements for the input array must be a power of 2.

If the size of Re{X} is different from the size of Im{X}, the VI uses the smaller number as the
size of the Complex FFT.

The operation is performed in place and the input array Re{X} and Im{X} is overwritten by the
Re FFT{X} and Im FFT{X}.

The largest complex FFT that can be computed depends upon the amount of memory on your
board.

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

Im FFT{X} is a DSP Handle Cluster that is identical to Im{X}, but with the imaginary part of
FFT{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.