A digital audio player, more commonly referred to as an MP3 player, is a consumer electronics device that stores, organizes and plays audio files. Some digital audio players are also referred to as portable media players as they have image-viewing and/or video-playing support.
Digital sampling is used to convert an audio wave to a sequence of binary numbers that can be stored in a digital format, such as MP3. Common features of all MP3 players are a memory storage device, such as flash memory or a miniature hard disk drive, an embedded processor, and an audio Codec microchip to convert compressed sound into analog form that is then played through the speaker jack.
Most digital audio players are powered by rechargeable batteries, some of which are not user replaceable. Listening to music stored on digital audio players is typically through earphones and stereo systems connected with a 3.5 mm jack.
reference: http://en.wikipedia.org/wiki/MP3_player
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