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CD players are often a part of home stereo systems, car audio systems, and personal computers. They are also manufactured as portable devices. Modern units can play other formats in addition to PCM audio coding used in CDs, such as MP3, AAC and WMA. DJs often use players with an adjustable playback speed to alter the pitch and tempo
Portable CD players are powered by batteries and they have a 1/8" headphone jack into which the user plugs a pair of headphones. The first portable CD player released was the D-50 by Sony. [58] The D-50 was made available on the market in 1984, [59] and adopted for Sony's entire portable CD player line.
A consumer-recorded CD is recorded by making marks in a thin layer of organic dye, which leads to incompatibility with some CD players. For some users of CD-Rs, the solution to this is to burn the CD at a slower speed or use a different brand of recordable CDs.
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At typical encoding rates, this means that tens of thousands of songs can be stored on one player. The disadvantages with these units is that a hard drive consumes more power, is larger and heavier and is inherently more fragile than solid-state storage. MP3 CD/DVD players: Portable CD players that can decode and play MP3 audio files stored on ...
The Imation RipGo! was a portable CD-R burner that was a similar form factor to that of the Memorex Mini CD player. Again, it was marketed as an MP3 device, and it could play MP3 and WMA files burned onto Mini CD media. It was powered by an internal lithium-ion battery that could power the unit for five hours of playback.
A portable audio player is a personal mobile device that allows the user to listen to recorded audio while mobile. Sometimes a distinction is made between a portable player, battery-powered and with one or more small loudspeakers , and a personal player, listened to with earphones .