DVD Anyone?

DVD Anyone?

DVD for Digital Video Disc or Digital Versatile Disc is a technology for optical storage. It has a bigger capacity, faster and better than Compact Disc that it can hold cinema-like video. This makes DVD an excellent format for movies and high capacity for high-definition computer games and multimedia applications.

DVD offers excellent picture and sound quality with 540 lines of resolution. And with a sampling rate higher and richer sound than with audio Compact Disc.

DVD store information in the form of pits and lands with data compression that is highly efficient. Lands are the smooth spaces between the pits, the raised bumps on the bottom of the disc.DVD player using a laser and a sensor read the pits and lands. Laser scans the underside of the disc, searching for the specific pits and land. The sensor measures how much light is reflected back while the laser bounces off the disc.

A double-layered DVD has another layer of lands and pits embedded below the top layer. This is like air bubbles in an ice cube. Laser is simply refocuses slightly in order to read the other layer.

It is the read head assembly the heart of a DVD player. It contains the lenses, laser and photo sensors that read the lands and pits on a DVD.

My Yamaha DVD Player

Happy viewing to all this 2008!

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