National Instruments 320571-01 用户手册

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.

The arrays Forward Coefficients in/out and Feedback Coefficients in/out must have a size of at least (order + 1)
for lowpass and highpass filters.  The arrays Forward Coefficients in/out and Feedback Coefficients in/out must
have a size of at least (2*order + 1) for bandpass and bandstop filters.

Computes the inverse Fourier transform of the
complex input sequence FFT {X}.  If Y
represents the output sequence, then:

Y  =  F

-

1

{X}.

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

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

Notes: The number of elements for the input array must be the power of two.  If the size of Re

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

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

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

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

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