ifftshift
Shift frequency spectrum related vectors to uncenter the dc element to the first position.
Syntax
y = ifftshift(x)
y = ifftshift(x,dim)
Inputs
- x
- The frequency spectrum related vectors to shift.
- dim
- The dimension on which to operate.
Outputs
- y
- The shifted vectors.
Example
x = fftshift([1:8])
y = ifftshift(x)
x = [Matrix] 1 x 8
5 6 7 8 1 2 3 4
y = [Matrix] 1 x 8
1 2 3 4 5 6 7 8
If x(5) is the location of the dc frequency and x(1) is the location of
the negative Nyquist frequency, then y(1) is the location of the dc frequency and
y(5) is the location of Nyquist frequency.Comments
After ifftshift, if a vector has an even number of samples the Nyquist frequency of the input will become centered in the output vector.