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What is a DVD and how does a DVD Player work?
WHAT IS A DVD AND HOW DOES A DVD PLAYER WORK
A DVD is a digital video disc, which has more space than a CD, which has only 4.7 GB, while a DVD has about 12.5 GB of storage. A DVD player works by using these steps. First, a drive motor will spin the disc around. Second, a laser and lens system focuses on the bumps and reads them. Lastly, a tracking mechanism moves the laser assembly so that the laser beam can follow the track.Then the tracking system has to be able to move the laser at micron resolutions. Then the movie starts up. A DVD plays when you put the DVD in, and you have to put it in properly.
Figure 1: A picture showing all the bumps on a DVD, and a DVD player and its remote.
Blu-ray discs are a different kind of disc compared to a DVD. A Blu-ray player only plays certain movies(Blu-ray ones) while a DVD can play the movies that are out. A Blu-ray disc can hold up to 50 GB, while a regular DVD can only hold 4.7 GB. A Blu-ray disc can be more money than a regular DVD, but a Blu-ray disc is has better quality and is clearer than a DVD.
Figure 2: A Blu-ray disc, which is different than a regular DVD.
A DVD is very similar to a CD but it has a much larger capacity
A single layer DVD holds about 7 times more data than a CD, which means it has enough room to store a full-length, MPEG 2-encoded movie, as well as slot of other information
A DVD movie usually includes the following-
up to 133 min of high resolution video
The video compression ratio is typically 40:1, using MPEG-2 compression
a soundtrack presented in to eight languages, using 5.1 Dolby digital surround sound
up to 32 languages
Figure 3: This is a DVD.
- digital video disc
- gigabyte, a type of space that is bigger than a megabyte.
designed to supersede the
- the little words you sometimes see at the bottom of a movie or TV screen
Video compression ratio
- The size of the video signal that's not yet compressed, compared to that same signal after it's compressed.
HRHD (high-resolution high-definition)
) is an
referring to an
, often seen as part of the
of TV shows shared on the Internet
MPEG-Moving Picture Experts Group
Moving Picture Experts Group
) is a
of experts that was formed by
to set standards for
Brain, Marshall. How
New York. Hungry Minds.2001.Print.
McGrath, Kimberly A.
The Gale Encyclopedia of Science.
Farmington Hills, MI. Gale Group
DVD. Wikipedia. Wikipedia. September 28, 2012. Web. September 19,2012.
Encyclopedia Britannica Online School Edition
Encyclopedia Britannica, Inc., 2012. Web. 27 Sept. 2012.
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