#### Inverse Fourier Transformation (IFT)

Editing the Power Spectrum

In many cases it is desirable to examine a
waveform without any “noise” present to distort the true nature of the
signal. This can be done by applying high-pass, low-pass, band-pass, and
notch filter functions to the power spectrum to eliminate the noisy frequency
components. The WinDaq Waveform Browser package provides high-pass filter,
low-pass filter, band-pass filter, and notch filter functions to eliminate
these unwanted frequencies from the plot. The high-pass filter removes
all frequency components to the left of the position of the cross hair
origin. The low-pass filter removes all frequency components to the right
of the cross hair origin. The notch filter removes the frequency (or frequencies
if the frequency axis is compressed) at the cross hair origin. The band-pass
filter is a combination of high-pass and low-pass filters applied to isolate
a narrow band of interest on the spectrum. The methods to edit the power
spectrum are as follows:

High-Pass Filter

Low-Pass Filter

Erase Frequency

Inverse FFT Generation

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