🛡️ Noise Immunity: Why Digital Wins

Analog signals accumulate noise at every stage. Digital signals reject it.

⚡ NOISE ADDED → ⚡ NOISE ADDED → ⚡ NOISE ADDED → Same noise at each stage
🌊 ANALOG
Original Signal Stage 0
✓ Clean signal
After Transmission Stage 1
⚠ Some noise added
After Amplification Stage 2
⚠ More noise accumulated
Final Output Stage 3
✗ Signal degraded
💻 DIGITAL
Original Signal Stage 0
✓ Clean 1s and 0s
After Transmission Stage 1
⚡ Noisy but readable
After Amplification Stage 2
✓ Regenerated → clean
Final Output Stage 3
✓ Perfect copy!
📉

Analog: Graceful Degradation

Every stage adds noise that cannot be removed. The original signal information is permanently mixed with noise. After many stages, the signal becomes unusable.

🔄

Digital: Regeneration

At each stage, we ask: "Is it above or below the threshold?" Then output a clean HIGH or LOW. Noise is rejected—the signal is perfectly restored every time.

💡

The Digital Advantage

With only two states (HIGH and LOW), digital systems have huge noise margins. As long as noise doesn't push a signal past the threshold, we can always recover the original data. This is why digital logic uses binary—it's maximally resistant to real-world interference.