Filter Data
Select menu item <Analysis><Filter> to apply the Fast Fourier Transform (FFT) filters or the Daubechies D4 Wavelet Tranform for digitally filtering data.
FindGraph provides five filters for digitally filtering data:
- The low pass filter allows you to eliminate noise at high frequencies.
- The high pass filter to eliminate noise at low frequencies.
- The band pass filter allows you to eliminate noise above and below a specified frequency range.
- The band block filter allows you to eliminate noise within a specified frequency range.
- The threshold filter allows you to eliminate noise corresponding to frequency components that are below a specified threshold.
- In dialog you can modify low and high frequencies and amplitude threshold level.
An inverse FFT and Wavelet Transform is performed on the filtered frequency spectrum to yield a new data series containing the original data with the noise removed.
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