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news lite -
technology

 

noise cancellation technology for digital phones

try clicking on the “hear the boom” button!

Thanx to Limbic.

marker at abelard.org

From an article on similar technology for headphones:

“First, tiny microphones, one on each earpiece, detect ambient noise before it gets to your ears. Then the noise-cancellation circuitry, usually housed in an external module, essentially inverts the captured signal, turning the noise's sound wave upside down. Before you know it, the noise-cancellation system adds the sonic opposite of the external noise to whatever you’re listening to, thereby eliminating most of the pollution and leaving you with just your music.”

Go here for more detailed technological description of noise cancellation.

02.05.2004

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