Decode Morse Code Audio in Python: From Waveform to Text

Morse code is, at its heart, a timing problem. A dot is one unit of tone, a dash is three, and the silences between them carry just as much meaning as the sounds. That makes it a perfect starter project for digital signal processing: you can go from a raw WAV file to readable text in under a hundred lines of Python, and every step teaches a concept that shows up again in real-world audio work.

In this tutorial we will build a complete Morse audio decoder: generate a test signal, extract its envelope, slice it into marks and spaces, classify each slice by duration, and decode the result into text.…