A CD player is an electronic device that plays audio compact discs, which are a digital optical disc data storage format. This players were first sold to consumers in 1982. It typically contain recordings of audio material such as music or audio books.
Inside your player, there is a miniature laser beam (called a semiconductor diode laser) and a small photoelectric cell (an electronic light detector).The laser (red) flashes up onto the shiny (under) side of the CD, bouncing off the pattern of pits (bumps) and lands (flat areas) on the disc.
Modern units can play audio formats other than the original CD PCM audio coding, such as MP3, AAC and WMA. DJs playing dance music at clubs often use specialized players with an adjustable playback speed to alter the pitch and tempo of the music. Audio engineers using players to play music for an event through a sound reinforcement system use professional audio-grade players. CD playback functionality is also available on DVD-ROM drive equipped computers as well as on DVD players and most optical disc-based game consoles.
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