I Decoded FM Stereo in Audacity and Found Something Amazing
Have you ever wondered how FM radio transmits stereo sound through a single frequency? I decoded an FM stereo signal in Audacity and discovered the hidden 19kHz pilot tone trick that makes it all work.
In this video, I show you exactly how FM radio hides two separate audio channels in one signal - and how you can decode it yourself using free software. You'll see the actual waveforms, hear the difference between mono and stereo, and watch me separate the left and right channels in real-time.
🎯 What You'll Learn:
• How FM stereo encoding actually works
• The secret 19kHz pilot tone and 38kHz subcarrier
• Step-by-step signal processing in Audacity
• Frequency doubler technique for stereo separation
• Live demonstration of channel reconstruction
🔧 Tools Used:
• Audacity (free audio editor)
• FM radio signal recording
• Spectrum analyzer
⏱️ Timestamps
00:00 – How FM Radio Hides Two Channels in One Signal
00:43 – Why Mono and Stereo Sound Different
01:54 – The Secret 19kHz Pilot Tone Trick
03:18 – Decoding FM Stereo in Audacity Step-by-Step
05:33 – Separating Left and Right Channels Live
08:27 – Recovering Hidden Stereo Audio
🔧 Want to try this yourself? The techniques shown here work with any audio editing software, though I'm using Audacity because it's free and powerful.
📻 More Vintage Audio Content:
[Link to your vintage audio playlist]
💬 Questions about FM stereo or audio processing? Drop them in the comments!
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