Fourier Builder and Spectral Analysis Explorer
Preset signal
Trend + seasonality
Airline-like
Two clean cycles
Leakage example
Number of observations
Add white-noise standard deviation
Resample noise
Vertical scale for editable waves
Component settings
Use these boxes for precise control over each wave. Dragging still works on the Waves tab.
Long cycle
Include this wave
Overlay on time series
Period (in observations)
Amplitude
Phase (degrees)
Seasonal wave
Include this wave
Overlay on time series
Period (in observations)
Amplitude
Phase (degrees)
Harmonic 1
Include this wave
Overlay on time series
Period (in observations)
Amplitude
Phase (degrees)
Harmonic 2
Include this wave
Overlay on time series
Period (in observations)
Amplitude
Phase (degrees)
Current components
Waves
Time series
Diagnostics
Resulting time series
Raw periodogram
Cumulative periodogram
Dominant spectral peaks