Active noise cancellation (ANC) works by recording ambient noise through external microphones, then generating an inverse sound wave (anti-noise) to cancel it before it reaches your ear. The processor does this in under 1 millisecond — faster than the sound wave itself.
- External mics capture ambient noise — traffic, engine hum, office chatter
- DSP processor analyzes the waveform — in real time, <1ms latency
- Anti-noise wave is generated — identical frequency, opposite phase (180° inverted)
- Anti-noise plays through the speaker — cancels the ambient noise wave
- Result: silence at your eardrum — 25-45dB noise reduction depending on model
ANC vs Transparency Mode — What's the Difference?
ANC mode: cancels external noise. Best for commuting, flights, open offices. Sony WF-1000XM6 achieves 40dB reduction — equivalent to turning a subway car into a quiet room.
Transparency mode: amplifies external sound through the mics. Best for street awareness, conversations, gym settings where you need to hear your environment.
Passthrough/Adaptive mode: Premium models like AirPods Pro 2 use adaptive transparency — it lets conversation frequencies through while blocking harmful noise above 85dB (construction, traffic horn).
Best ANC Performance in 2026
| Model | ANC Reduction | Transparency | Price |
|---|---|---|---|
| Sony WF-1000XM6 | 40dB | ✅ Excellent | $279 |
| Apple AirPods Pro 2 | 35dB | ✅ Adaptive | $179 |
| Samsung Galaxy Buds3 Pro | 25dB | ✅ Good | $199 |