How CD Players work!

What the CD Player does: Laser Focus; Inside the CD Player, there is a piece of technology that is involved with forming the data into understandable data blocks. it sends them to either the DAC or to the computer. The basic job of the CD Player is to focus the laser track on the bumps of the surface. The laser beam passes through the polycarbonate layer, reflects off of the aluminum layer, and hits an opto-electric device that detects the change in light. The electronics in the drive interpret the changes in reflectivity in order to read the bits that make up the bytes.

                       

What the CD Player does: The hardest part is keeping the laser beam centered on the data track. The centering is the job of the tracking system. The tracking system continuously moves the laser outward. As that moves, the bumps move past the laser faster. Then, the spindle motor has to slow the speed of the CD in order for the bumps to travel past the laser at a constant speed, therefore, making the data spin off the disc at a constant speed.                                                                                         

                                                                                  

CD Player components:

-Drive motor: spins the disc. Its controlled to rotate between 200 and 500 rpm depending on the track.

-Laser/lens system: focus is on and reads the bumps.

-Tracking Mechanism: moves the laser assembly so that the laser's beam can follow a spiral track.

                                 

 

 

                                                                                                        How MP3 Players work!

The MP3 Format: MPEG is an acronym for Moving Picture Experts Group. This group has developed compression systems used for video data. The MPEG compression system includes a subsystem to compress sound, called MPEG Audio Layer-3, otherwise known as MP3.                                                                    

                                                                                                       

Parts of an MP3 Player:

-Data port

-Memory

-Microprocessor

-Digital signal processor

-Display Playback controls

-Audio port

-Amplifier

-Power supply

The inside of a Rio MP3 player. You can see th LCD panel, several large chips (the microprocessor, DSP chip and I/O controller), the amplifier and buttons.

FACT: MP3 Players that contain tiny hard disk drives can store 10 to 150 times more than flash memory devices can.

                                                                                  

Links:                                                                                         

 How CDs work!                                                         

 How do lasers work

 All about fireworks   

 Home

Source:

 http://www.howstuffworks.com/

Personal Info:

4 THINGS ABOUT MYSELF:
I love to travel and have been to 4 other countries.
I'm a sports fanatic.
I grew up in the Chicago suburbs.
I love to be around people and have great people skills.

 

 

 

                                 *This page is not that of a real company but is for a chemistry assignment for General Chemistry 140 at Monmouth College.