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DVD Player

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What is DVD Player?

A DVD player is a device that plays discs produced under both the DVD-Video and DVD-Audio technical standards, two different and incompatible standards. Some DVD players will also play audio CDs. DVD players are connected to a television to watch the DVD content, which could be a movie, a recorded TV show, or other content.

The first DVD player was created by Sony Company in Taiwan in collaboration with Pacific Digital Company from the United States in 1994. Some manufacturers originally announced that DVD players would be available as early as the middle of 1996. These predictions were too optimistic. Delivery was initially held up for "political" reasons of copy protection demanded by movie studios, but was later delayed by lack of movie titles. The first players appeared in Japan in November 1, 1996, followed by U.S. players in March 26, 1997 with distribution limited to only 7 major cities for the first 6 months.

 

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How DVD Player work?

Inside your DVD player, there is a miniature laser beam and a small photoelectric cell. When you press play, an electric motor makes the disc rotate at high speed (up to 500rpm). The laser beam switches on and scans along a track, with the photocell, from the centre of the CD to the outside. The motor slows the disc down gradually as the laser/photocell scans from the centre to the outside of the disc. Otherwise, as the distance from the centre increased, the actual surface of the disk would be moving faster and faster past the laser and photocell, so there would be more and more information to be read in the same amount of time.

The laser flashes up onto the shiny side of the DVD, bouncing off the pattern of pits and lands on the disc. The lands reflect the laser light straight back, while the pits scatter the light.

Every time the light reflects back, the photocell detects it, realizes it's seen a land, and sends a burst of electric current to an electronic circuit that generates the number one. When the light fails to reflect back, the photocell realizes there is no land there and doesn't register anything, so the electronic circuit generates the number zero. Thus the scanning laser and electronic circuit gradually recreate the pattern of zeros and ones that were originally stored on the disc in the factory. Another electronic circuit in the DVD player decodes these binary numbers and converts them back into a changing pattern of electric currents.

A loudspeaker transforms the electric currents into sounds you can hear (by changing their electrical energy into sound energy).

 

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How to use DVD Player?

1. Plug in the DVD player and make sure it turns on.

2. Determine what type of connection you need.

3. There are at three common ways to connect a DVD player, and each needs a different cable to work. Your DVD player should come with all of the appropriate cords, but you need to check which connections your TV accepts as well. Look into your owner's manuals or check the TV and DVD Player yourself to see what connections you can use. The three most common are HDMI, A/V Cables (Three-Prong) and Component Cables.

4. Plug the first end of the cable into the HDMI, A/V Cables (Three-Prong) and Component Cables socket on the DVD player.

5. Plug the second end of the cable into the HDMI, A/V Cables (Three-Prong) and Component Cables socket on the TV.

6. Power on the DVD player and TV Insert a DVD so that you can test both the picture and the audio.

7. Check all of the Input or Auxiliary channels.

 

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