Compact disc player
A CD player is a device that can read the binary data on a CD (compact disc) and turn that into sound waves.
A CD player has a laser and an optical sensor. A CD has tracks and bumps on the tracks. The CD player passes a laser beam along the track of the CD. The areas that are reflected (without the bumps) are 1s to the player and the areas that are reflected (with the bumps) are 0s to the player. When the 1's and 0's are added to the CD a complicated coding is used that enables error corrections to prevent the CD "skipping" in the event of a small scratch. The CD player converts the series of 1's and 0's into sound waves by sending a varying voltage into an amplifier which then drives a speaker. The conversion of digital data into an analogue signal is achieved through the use a matrix(maths not the movie), imaginary numbers and trigonometric functions.
Compact Disc Player Media
Panasonic CD player SL-S250C with Philips Digital Classics CD.
Sony CDP-101, from 1982, the first commercially released CD player for consumers
A JVC FS-SD5R CD player from the 1990s with a transparent plastic cover and blue backlight
This disc is highly corroded. The error correction cannot correct all errors. Two minutes can be played, however.
Silver Sony CD Walkman D-E330, taken from an angle.
Photodiode array on the Philips RAFOC single-beam tracking optical device used in many CDM optical assemblies
BenQ DW1640 - laser unit - lens with coils. This low mass lens coupled to an electromagnetic coil is in charge of keeping focused the beam on the data track.
A 1980s-era Denon CD player with the chassis cover removed to show the electronic and mechanical components.
Der legendäre Philips CD 100, Baujahr 1983, Preis damals 2000 DM
Underside view showing a radial-type tracking mechanism with screw drive
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