Reduce noise without distorting peaks, and restrict a curve to a range or cycle, without changing the raw data. Five filters, from one-click presets to a tunable spectrum view.
A good filter removes random fluctuation without softening the peaks you care about. A bad filter broadens peaks and shifts positions.
Studio offers five filters: Savitzky-Golay for peak-preserving smoothing, moving average, median for isolated spikes, an FIR low-pass, and a notch for 50 or 60 Hz line pickup. All are zero-phase, so they do not shift peaks.
Savitzky-Golay fits a polynomial to a sliding window of points and replaces the centre point with the fitted value. The window width sets how aggressively noise is averaged out; the polynomial order sets how much peak shape is preserved.
The FIR (finite impulse response) filter convolves the data with a pre-designed kernel. Studio ships notch kernels for 50 Hz and 60 Hz and a configurable low-pass.
Filtering
Screenshot coming
Filter type
Typical: Savitzky-Golay
Savitzky-Golay, moving average, median, FIR low-pass, or notch. SG is the default for voltammograms; median clears isolated spikes; notch kills mains pickup; FIR low-pass sets a sharp cut-off.
Window (SG)
Typical: 11 points
Number of points per fit. Must be odd. Larger windows smooth more but broaden peaks. Start near 5 % of your peak width in points.
Polynomial order (SG)
Typical: 3
2 or 3 for most scans. Order 3 preserves peak shape better; order 2 is more aggressive.
FIR kernel
Notch (50 / 60 Hz) or low-pass. Cutoff is user-configurable for the low-pass.
Cutoff (FIR low-pass)
Stop-band frequency in Hz. Choose above your signal bandwidth but below the noise you want to reject. FIR low-pass and notch both need a uniform sampling rate.
Range and cycle
Restrict the curve to a potential or time window, or a single CV cycle, before analysis. For EIS the range selects the frequencies the fit uses.
Walkthrough
Smooth a noisy DPV trace before peak finding
Result
A cleaner trace where peak positions and widths are unchanged but baseline noise is cut by roughly a factor of two.
Right-click a curve and pick a Filter preset (Off / Light / Medium / Strong), or Customize for the full Data Processing window with a live spectrum view. While the window is open the filtered trace overlays the raw one; the raw data stays in the file, and turning the filter Off brings it straight back.
Step-by-step in docs
Data processing
Other analysis tools