Inverse FFT VI

Owning Palette: Transforms VIs

Requires: Multicore Analysis and Sparse Matrix Toolkit

Computes the inverse fast Fourier transform (FFT) of the input sequence X.

You must manually select the polymorphic instance you want to use.

Details  

1D Inverse FFT (DBL)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence, which should be conjugated centrosymmetric except for the first element.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

1D Inverse FFT (SGL)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence, which should be conjugated centrosymmetric except for the first element.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

2D Inverse FFT (SGL)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence, which should be conjugated centrosymmetric except for the first row and column.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

2D Inverse FFT (DBL)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence, which should be conjugated centrosymmetric except for the first row and column.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

1D Inverse FFT (CSG)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

1D Inverse FFT (CDB)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

3D Inverse FFT (SGL)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence, which should be conjugated centrosymmetric.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

3D Inverse FFT (DBL)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence, which should be conjugated centrosymmetric.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

2D Inverse FFT (CSG)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

2D Inverse FFT (CDB)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

3D Inverse FFT (CDB)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

3D Inverse FFT (CSG)

	shift? specifies whether the DC component is at the center of FFT {X}. The default is FALSE.
	FFT {X} specifies the complex-valued input sequence.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	X returns the inverse FFT of FFT {X}.
	error out contains error information. This output provides standard error out functionality.

Inverse FFT Details

The following table lists the support characteristics of this VI.

Supported on RT targets	Yes
Suitable for bounded execution times on RT	Yes

Use the DBL or SGL instance of this VI only if FFT {X} is the Fourier transform of a real time-domain signal. Otherwise, use the CDB or CSG instance.

For a 1D, N-sample, frequency domain sequence Y, the following equation defines the inverse discrete Fourier transform (IDFT):

for n=0, 1, …, N–1.

For a 2D, M-by-N frequency domain sequence Y, the following equation defines the inverse discrete Fourier transform (IDFT):

for m = 0, 1, …, M–1, n=0, 1, …, N–1.

For a 3D, M-by-N-by-K frequency domain sequence Y, the following equation defines the inverse discrete Fourier transform (IDFT):

for m = 0, 1, …, M–1, n=0, 1, …, N–1, k=0, 1, …, K–1.