The modern world #7 (Home cinema )
HOME CINEMA REPLICATES. a real "movie theatre" using pictures displayed on a high quality widescreen television set, such as a plasma TV, and surround sound from strategically sited loudspeakers. The source for sound and vision is a DVD (Digital Versatile Dise). Its player uses standard CD (Compact Disc) digital technology, but with a higher density of laser- read microscopic pits more than 20 billion such pits in multi-level spiral tracks that, stretched out, would extend nearly 40km (25 mil