CES 2008 - Sony MDR-NC500D Digital Noise Cancelling Headphones

Sony unveiled at the CES the MDR-NC500D, the world's first digital noise cancelling headphones. This headphones use digital technology to more accurately reduce stress-inducing noise from planes, trains and busses, while providing a high-quality audio experience.

Sony claims the MDR-NC500D can reduce up to 99 percent of ambient noise at 160HZ, which is the peak frequency of a jet engine. These headphones use a unique digital noise canceling software engine and three digital filters located in the built-in digital signal processor, which has been specifically tuned for effective noise reduction in airplane, train/ bus, or office sound environments. The internal lithium-ion battery lasts for up to 16 hours, also have an external battery box holds two AA batteries for when there is no access to a wall plug.

The MDR-NC500D headphones will be available in February for about $400.