Look Ma, no hands!

John Baxter | February 01, 2010

How the bad sound disappears

Not all headsets have noise cancellation technology, but those that do use a cool technology to blot out distracting sounds and leave voices untouched.

Chuck White of DAS explains that every sound has a distinct wave shape:

“Noise-canceling technologies first rely on small microphones that detect the sounds in a given environment. A digital signal processor determines what sound wave is required to cancel the unwanted sound wave and then it creates that sound and amplifies it through speakers or headphones.

“Imagine a ‘positive’ sound and a ‘negative’ sound created at virtually the same time, and these two sounds cancel themselves out.”