How a CD?


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There exists today a wide range of CD players available to consumers and to choose the right CD player can feel like a daunting task. Style, quality, design och technical solutions vary greatly between different actors. Some players are portable, while others are included in larger sound systems. Some players can handle only one disk at a time, while others can easily pass between the discs 50 or more. Some CD drives are very cheap, others are very expensive. The list is long. ThoughCD you choose, however, consists of three basic parts which are found in all CD players and modern: a drive motor, a monitoring device and a laser and a lens system. Another thing that all CD players have in common is that they interpret the data that is stored in the form of elongated bumps on a CD (compact disc).

The drive motor in your CD player is the party that goes round the disc spin round to a correct rhythm. Gradually adjust the motor speedgood rhythm depends on what part of the disc is played. In some places, the rate should not exceed 200 rpm, while elsewhere, the rate would be increased to 500 rpm. When the disc spins round and round the drive motor, the tracking mechanism to adjust the laser assembly and the laser and lens system to focus on small bubbles where the data was stored. The laser is constantly pushed by the center and outwardon the record by the monitoring mechanism.

The data are interpreted by the laser and the lens system is stored in the form of elongated bumps on the surface of the CD. A stroke is very small and not more than 0.5 microns. The height is greater than 125 nanometers and a length of 0.83 micron or a little more. All these moves are carefully arranged on the surface of the CD in the form of a 5 km (3.5 miles) long spiral.

The CD consists of severallayers, one layer of polycarbonate and an aluminum layer. When the laser is to interpret the data that has been stored on the CD, first, enter the layer of polycarbonate. The layer of aluminum to reflect the laser beam, and alterations of light is detected by a special mechanism optoelectronic into the CD. Since the bumps in the data were stored reflects light differently than in the regions between the bumps (commonly called "land"), CDplayer can determine exactly which parts of the disc consists of the shocks and the parties are not.

If the CD is scratched or injured, it may be impossible for the CD to interpret. Sometimes, only a small portion of data is omitted, but the greatest damage will do all the CD unusable. Always keep the CD in a protective housing to reduce the risk of scratches. When you clean the CD carefully move your hand across the center and outwards to theboard and not just wipe around. Scratches that occur in a radial movement tend to be less harmful than other stripes.

Tags - Sony STR-DH700 Pioneer VSX-918V AV Receiver Pioneer Elite VSX-03TXH


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