DVD+Player

=DVD Player= mgonoude12toc , sschunder13



Purpose
//What is the fundamental purpose of the device?// The purpose of this device is to display digital video disc's (DVD's) on a screen by transferring signals from the DVD to the television for people to view. The job of a DVD player is to use the laser inside of the machine to read the bumps on the disc that is inserted and to transfer that into a signal that goes through wires connected to a television and then display it for viewers to watch. The main purpose of the DVD player is to focus the laser on the track of bumps.

Energy
//What energy transformations are seen in its operation?// The energy that is used with a DVD player is electricity. You have to plug it into a wall outlet, which allows the electricity to flow through the wires inside and out of the DVD player, turning on all sensors, lasers, and lights on the inside. The electricity goes through the wires that are connected to the TV, and therefore creating a video signal.

Controls
//What sensors/controls are designed into the device?// Play- starts the movie Pause- stops the movie Rewind- makes the movie go backwards in the scenes Fast Forward- skips part in the movie to move to a further scene Stop- stops the movie completely

A laser sensor is designed into the device. This allows the DVD player to read the bumps on the actual DVD and know what signals to send to the TV.



Materials
//What material(s) are essential to the device?// A motor is essential to a DVD player in order to move the DVD. Also, a laser beam with sensors around it are needed to read the bumps on the disc. The laser beam will read the unique pattern on the disc and transfer it through the cable wires to the TV for a video signal. The laser beams in a DVD player are smaller than a CD player because then it can focus on the small DVD pits.
 * [|http://electronics.howstuffworks.com/dvd6.htm]** ( there are diagrams that show how a DVD player laser reads the discs and how the motor moves the disc.)



Science
//What is scientific principle is central to its operation?// The scientific principle key to this device is sensors, and also electricity turning into a video signal. There is a laser beam inside of the DVD player that senses the specific disc and reads it to detect what to play. To get the DVD player to turn on, you have to plug it in to a wall outlet. This starts up the laser beam and the electricity running through the machine to send a signal through the wires that are connected to the DVD player to turn it into a video signal.

Design
//What does a typical device look like?// There are two types of designs-one being a square that you can fold up and back down that you can take with you if you are on the move, and has a place to put in the DVD. The other design is a long, skinny rectangle with an opening for you to insert the DVD. Each of them have buttons to push to control your viewing experience including the ability to play, pause, fast forward, rewind, and stop the movie that you are watching.

Evolution
//What changes have there been (or could there be) in this device?// The newest, or most advanced, change to the DVD player is that it has evolved into a Blue Ray Player. A Blue Ray Player is extremely similar to the DVD player, but it plays the movies in high definition. There are special discs that are used with Blue Ray that would not be able to play in a DVD player because a DVD player does not have the capabililty to hold the high definition disc. Slowly but surely, most new movies that come out for people to buy are in the Blue Ray form because that is where technology is advancing to.

Competitors
//What other devices serve a similar purpose?// A similar device that serves a similar purpose as a DVD player is a CD player. A CD player reads bumps on a CD to read the specific music on it just like a DVD player reads the bumps of the DVD in order to play it on a screen. Also, a Blue Ray player serves the same purpose as the DVD player. They both display items (such as DVD's) onto a screen for people to view them. The main difference is that a Blue Ray player is in high definition.

Partners
//What other devices work in conjunction with this device?// In order for a DVD player to work, it must work in conjunction with a digital video disc (DVD), which would serve the purpose of the machine. Also, there needs to be an output (a TV) for the DVD player to be able to send the message to it.

Siblings
//What other devices use the same scientific principle?// Blue Ray Player Computer Disk Loader Both of those devices use the same scientific principle as the DVD player. They both have sensors that read the bumps on the disc being put into them to therefore display them on a screen.

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