To the joy and delight of babysitters everywhere, Sony announced a boatload of new noise-cancelling headphones and earbuds to keep you sane in loud situations. Leading the pack are the the $200, on-ear active / passive MDR-NC200D headphones, which have a 40mm drivers in each ear, 22-hour battery and folding design. For $150, users wanting portability can cop the smaller in-ear MDR-NC100Ds, which have a lower price tag and 13.5mm drivers. Both headphones feature Sony's "Artificial Intelligence Noise-Cancelling" technology, which claims to automatically reduce ambient noise by aroun
