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Compact Disc player

A Compact Disc player  or CD player, is an electronic device which plays audio Compact Discs. CD players are often installed into home stereo systems, car audio systems, and personal computers. They are also manufactured as portable devices. Modern units support other formats in addition to CDs; such as DVDs, CD-ROMs with audio files and video CDs. DJs often use players with adjustable playback sampling rate to alter the pitch of the music programme. Many modern CD players also include the capability to play MP3 CDs. CD playback functionality is also available on all modern CD-ROM/DVD-ROM drive equipped computers as well as on DVD players and CD-ROM/DVD-ROM based game consoles.

 

DVD Disc 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

A DVD player has to complete these tasks:

• Read a DVD disc in ISO – UDF version 1.2 format
• optionally decrypt the data with either CSS and/or Macrovision
• read and obey the DVD's Regional lockout codes and display a warning if the player is not authorised to play the DVD
• decode the MPEG-2 video stream with a maximum of 10 Mbit/s (peak) or 8 Mbit/s (continuous)
• decode sound in MP2, PCM or AC-3 format and output (with optional AC-3 to stereo downsampling) on stereo connector, optical or electric digital connector
• output a video signal, either an analog one (in NTSC, PAL or SECAM format) on the composite, S-Video, SCART, or component video connectors, or a digital one on the DVI or HDMI connectors

 

MP4 Video Player

A majority of portable media players developed in China and surrounding regions are known as MP4 players, as they are assumed to support the MPEG-4 video format. However, these players are actually incompatible with the format and are limited to low-grade proprietary formats, including AMV, ATV (no relation to the Hong Kong-based television network) and SMV (SigmaTel video, used on players with SigmaTel-based technology) that are considered to be cheaper alternatives for these players.

 

 

iPod

iPod is a brand of portable media players designed and marketed by Apple Inc. and launched on October 23, 2001. As of 2008, the current product line-up includes the hard drive-based iPod classic, the touchscreen iPod touch, the video-capable iPod nano and the screenless iPod shuffle. Former products include the compact iPod mini and the spin-off iPod photo (since re-integrated into the main iPod classic line). iPod classic models store media on an internal hard drive, while all other models use flash memory to enable their smaller size (the discontinued mini used a Microdrive miniature hard drive). As with many other digital music players, iPods, excluding the iPod touch, can also serve as external data storage devices. Storage capacity varies by model.

Apple's iTunes software is used to transfer music to the devices. As a jukebox application, iTunes stores a music library on the user's computer and can play, burn and rip music from a CD. It can also transfer photos, videos, games, and calendars to iPod models supporting those features. Apple focused its development on the iPod's unique user interface and its ease of use, rather than on technical capability. As of September 2007, the iPod had sold over 110 million units worldwide making it the best-selling digital audio player series in history.