Wireless signals outpace sound waves for better noise cancellation

Active noise-cancelling headphones work by generating a sound wave that is 180 degrees out of phase with the ambient noise. This requires the headphones to have a microphone inside the ear cup to listen for the noise to be cancelled, but this means the noise-cancelling circuitry doesn't have a lot of time to generate the anti-noise signal and some ambient noise will get through. By moving the microphone towards the noise and employing wireless technology, researchers have now developed better noise-cancelling technology that doesn't require bulky noise-blocking headphones.

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Category: Science

Tags:

• Audio
• Noise Canceling
• Sound
• University of Illinois

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