Also: The best noise-canceling headphones you can buy As the name suggests, ANC works to actively cancel out the ambient noise that interferes with what you hear from the sound coming from headphones themselves. It can be great for locking in and blocking out. Noise-canceling earbuds or headphones can help drown out distraction, but have you ever wondered how they actually work? Are you listening to them or are they listening to you? Read on to learn more about the sound technology behind the silence.
Sound waves: Peaks and valleys
Before we talk about headphones, let’s start with the science behind hearing: sound waves. Traveling through the air to our ear, sound waves carry everything from the screeching morning subway to the subtle “click-clack” as we type. Also: Headphones: A beginner’s guide to terminology and technology Like regular waves, sound waves are made up of various peaks and valleys that together make the noise we end up perceiving. Sound wave peaks and valleys, when matched with a similar pattern, can amplify sound. An example is when you’re at a concert and everyone is singing the same song at relatively the same pitch, so it sounds like one voice. This phenomenon is often referred to as constructive interference. Also: AirPods Pro might be an inexpensive solution to your hearing loss On the flip side, when two sound wave peaks and valleys oppose each other, instead of amplification there’s a net cancellation. This phenomenon is referred to as destructive interference, and the result is silence. That’s where noise-canceling headphones come in.
How ANC headphones listen to create silence
Now, let’s talk about how ANC headphones use sound waves’ structure to give you peace and quiet. Equipped with tiny microphones on either the inside or outside of the headphones’ ear cups, ANC headphones listen to your surroundings as much as you listen to the sound they’re playing. Also: How to connect Bluetooth headphones to Xbox When the microphones detect noise, they emit an “anti-noise” sound wave that opposes the incoming wave’s peaks and valleys, so that you are unable to hear the external noise. This destructive interference is why ambient noise is often cancelled out when you wear ANC headphones even when you don’t play music.
Where wearing ANC headphones works best
If you’re thinking that it’s seemingly impossible for tiny microphones to pick up and transmit a counterattack on every single disruptive sound wave, you’re correct. Sound still slips through. Review: Sony’s WH-1000XM5 headphones are basically perfect ANC headphones and the overall sound wave cancellation process work best in a consistent environment. Consistent environments include airplanes, subways (minus the conductor speaking), and in a quiet work environment. Plus, some headphones have more effective ANC than others. Review: Do Soundcore’s Sleep A10 noise-masking earbuds really work?
