Continuous Wavelet Transform
Time-frequency scalogram via Morlet / Mexican hat wavelets
Signal
Type
Chirp (sweep)
Multi-sine
Square wave
Noisy chirp
Pulse train
Compute CWT
Wavelet
Type
Morlet
Mexican hat
Paul
Freq min
2
Hz
Freq max
50
Hz
Display
Color scale
Hot
Viridis
Jet
Frequency steps
40
CWT: W(a,b) = ∫ f(t) ψ*((t−b)/a) dt/√a
Scale a ↔ frequency f. Scalogram = |W(a,b)|²