CD to Loudspeaker
On the shiny side of a CD are lots of very very tiny digits. This means that there are actually no pictures or videos on your CD there are actually just numbers and numbers and numbers! The digits that are used are 1's and 0's. The o's are known as pits and the 1's are known as land. This means that a CD isn't actually sooth it's actually rough. This combination of digits is actually called the binary code. These numbers are also referred to as bits.
This short Youtube video helps to understand the Binary Code:
This short Youtube video helps to understand the Binary Code:
How does a CD player work?
1) The CD will start to spin around in the CD player. This is when you can hear the buzzing noise from.
2) There is a laser (Semiconductor Diode Laser), a photo electric cell and a electronic light detector inside the CD player.
3) The Laser (directed by the lens) reads all of the digits (Binary Code) off of the CD from the middle of the CD to the edge. Different surfaces reflect the light differently. This is how reflection comes into How a CD player works.
4) The Laser will keep reading the data but the closer to the edge of the CD the laser gets the slower the Laser scans the CD.
5) When the photo cell detects that the light beam has been reflected right back it sends an electrical signal to the electronic circuit. This will signal it is a 1. This is how sound is created using all of the electronic signals which are sent.
6) If the light does not get reflected right back then it is a 0.
This is why when you have a scratch on your CD it doesn't play properly because the laser cannot read the CD.