Disc Reading
Objective lenses in conventional CD players have a longer working distance, or focal length, than lenses designed for SACD players. This means that when a hybrid SACD is placed into a conventional CD player, the laser beam passes the high-resolution layer and is reflected by the conventional layer at the standard 1.2 mm distance, and the high-density layer is out of focus. When the disc is placed into an SACD player, the laser is reflected by the high-resolution layer (at 600 µm distance) before it can reach the conventional layer. Conversely, if a conventional CD is placed into an SACD player, the laser will read the disc as a CD since there is no high-resolution layer.
Read more about this topic: Super Audio CD
Famous quotes containing the words disc and/or reading:
“This is D.J., Disc Jockey to American turning off. Vietnam, hot dam.”
—Norman Mailer (b. 1923)
“A society person who is enthusiastic about modern painting or Truman Capote is already half a traitor to his class. It is middle-class people who, quite mistakenly, imagine that a lively pursuit of the latest in reading and painting will advance their status in the world.”
—Mary McCarthy (1912–1989)