MP3 player
Audio players that store digital audio signals are widely available. An MP3 player is a digital audio player used for music listening. The motion picture experts group (MPEG) MPEG specifications relate to both picture and sound. MP3 audio, which is a specific MPEG layer 3 audio format, is becoming enormously popular as the audio format of choice. The MP3 audio information is transported in a data stream that contains headers at specific intervals. Each header is associated with a frame describing a predetermined number of samples of audio data in compressed form. The header indicates information about the data in the frame, such as the sample frequency of the data in the frame and the bit rate. MP3 technology allows large amounts of information to be stored in small, relatively inexpensive semiconductor memory chips. The technology creates sound files a tenth the size of standard CD music files with very little loss of sound quality. As a result, huge numbers of Internet users have taken to trading MP3 files back and forth or posting them on download sites. An MP3 player typically includes the player itself with all the required circuitry and buttons for user manipulation, an audio port, and a data port. MP3 players generally use a flash memory, a liquid crystal display (LCD) screen, a control panel and an output jack for audio headphones and other similar devices. Musical compositons are loaded into the flash memory of the MP3 player through connection to a personal computer (PC). An MP3 player is used in conjunction with a pair of earphones or headphones, and a USB cable for connection to a personal computer. An earphone connector of the earphones is connected to the audio port of the MP3 player. The MP3 player is held or carried by the user, making it inconvenient for physical activities.
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