Noise-cancelling headphones are impressive, but they're not magic. Let me break it down for you:
- Sound travels in waves, vibrating air molecules. When two sound waves meet—one identical in frequency but opposite in amplitude—they largely cancel each other out.
- Active noise-cancelling (ANC) headphones use tiny microphones to capture external sounds and play the opposite phase of those sounds through the headphone drivers. This reduces perceptible noise.
- However, this process is most effective on lower frequencies (between 50 Hz and 1 kHz).
2. **Why You Still Hear Some Sounds:**
- ANC can't completely isolate sound due to trapped air between the headphones and your eardrum.
- Without this trapped air, no sound (including your music) would be audible.
- Sounds with varying pitch levels (like voices) also tend to evade noise cancellation .
So, while ANC works well for airplane engines, it's not a total silencer for all ambient sounds! .
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