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A compressed audio optical disc, MP3 CD, or MP3 CD-ROM or MP3 DVD is an optical disc (usually a CD-R, CD-RW, DVD-R or DVD-RW) that contains digital audio in the MP3 file format. Discs are written in the " Yellow Book " standard data format (used for CD-ROMs and DVD-ROMs ), as opposed to the Red Book standard audio format (used for CD-DA audio CDs).
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. In 1998, portable MP3 players began to compete with portable CD players.
Some MP3 players can encode directly to MP3 or other digital audio formats directly from a line-level audio signal (radio, voice, etc.). [citation needed] Devices such as CD players can be connected to the MP3 player (using the USB port) in order to directly play music from the memory of the player without the use of a computer. [citation needed]
iRiver SlimX iMP-550 player from 2004. These players would play MP3 format CD-R and CD-RW burned discs. The first player was the iMP-100 in 2000. The iMP-250 was released in 2001. OEM orders were received from the American Rio, and led to the iMP-100 and iMP-250 also being released as the RioVolt SP90/100 and SP250. [41]
Some portable CD players can play CD-R/CD-RW discs and some can play other formats such as MP3-encoded audio. While audio typically is output via a headphone connector, higher-end models may feature an additional integrated speaker. The 8 cm CD provides a smaller alternative to the normal 12 cm CD (although with a lower capacity). Miniature ...
By August 1983 the company was able to produce a CD player which was one-tenth the size of the original, and a portable CD player became a possibility. [citation needed] The aim was to create a player that was the same size as four CD cases stacked on top of each other. A piece of wood 13.4 cm across and about 4 cm thick was shown to the staff ...
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