时间:2019-03-01 05:14:02166网络整理admin

Great news for ham-fisted guitarists: Gibson of Nashville, Tennessee, is launching a self-tuning electric guitar that uses piezoelectric crystals under each string to sense the frequencies of its vibrations. If a string needs tuning, a built-in chip sends an electrical signal to a tiny motor at one end, which tightens or loosens the string. Websites such as Amazon and Netflix offer recommendations for books and movies based on what users have bought in the past. Till now, each site has had to learn its customers’ tastes from scratch,