- Digital audio player
A digital audio player, more commonly referred to as an MP3 player, is a
consumer electronicsdevice that stores, organizes and plays audio files. Some DAPs are also referred to as portable media players as they have image-viewing and/or video-playing support.
The most popular predecessor to digital audio player is the portable CD, which was commonly known as a"Portable Audio Devices".
Briton Kane Kramer designed one of the earliest digital audio players, which he called the IXI. His 1979 prototype was capable of approximately 3.5 minutes of audio playback but it did not enter commercial production. The related patents expired in 1988.
Apple Inc.hired Kramer as a consultant and presented his work as an example of prior artin the field of digital audio players during their litigation with Burst.comalmost two decades later. [ [http://www.foxnews.com/story/0,2933,419522,00.html British Man Says He Invented iPod in 1979] , Foxnews.com, 9/09/2008]
The first mass-produced DAP was created in 1997 by SaeHan Information Systems, which domestically sold its “MPMan” player in the middle of 1998. [cite web|url=http://reviews.cnet.com/4520-6450_7-5622055-1.html|title=Introducing the world's first MP3 player|last=Van Buskirk|first=Eliot|publisher=
CNET] The South Korean company then licensed the players to Eiger Labs which distributed them—now branded as Eiger Labs MPMan F10—to the North American market during the summer of 1998. [cite web|url=http://www.mp3playerlimelight.com|title=MP3 Players - The Basics and History] The flash-based players were available in 16 MB storage capacity.
Rio PMP300from Diamond Multimediawas introduced in September 1998, a few months after the MPMan. It was a success during the holiday season, with sales exceeding expectations. [cite web|url=http://www.antiqueradio.com/Dec04_Menta_mp3pt1.html|title=Collecting MP3 Portables -- Part 1|last=Menta|first=Richard|publisher=Antique Radio Classified] Interest and investment in digital music were subsequently spurred from it. [cite press release|url=http://news.harmony-central.com/Newp/1998/Rio-PMP300.html|date= 1998-09-14|title=Diamond Multimedia Announces Rio PMP300 Portable MP3 Music Player|accessdate=2007-12-05|publisher=Harmony Central] Because of the player's notoriety as the target of a major lawsuit, the Rio is erroneously assumed to be the first DAP. [cite news|url=http://www.news.com/Bragging+rights+to+the+worlds+first+MP3+player/2010-1041_3-5548180.html|title=Bragging rights to the world's first MP3 player CNet.com article on the first manufactured DAPs.]
Compaqdeveloped the first hard drive based DAP using a 2.5" laptop drive. It was licensed to HanGo Electronics (now known as Remote Solution), which first sold the PJB-100 ( Personal Jukebox) in 1999. The player had an initial capacity of 4.8 GB, which was advertised to be able to hold 1200 songs. [cite news|url=http://www.eetimes.com/story/OEG20000818S0035|last=Yoshida|first=Junko|coauthors=Margaret Quan|title=OEMs ready to roll on jukeboxes for Net audio|pages=1|publisher= EE Times|date=2000-08-18|accessdate=2007-12-05]
October 2001, Apple Computer (now known as Apple Inc.) unveiled the first generation iPod, the 5 GB hard drive based DAP with a 1.8" Toshibadrive. With the development of a minimalistic user interfaceand a smaller form factor, the iPod was initially notable within users of the Macintoshcommunity. In July 2002, Apple introduced the second generation update to the iPod. It was compatible with Windows computers through Musicmatch Jukebox(now known as Y!Music Musicmatch Jukebox). The iPod series, which grew to include microdriveand flash-based players, has become the market leader in DAPs.
Archosreleased the first official PMP, the Archos Jukebox Multimedia. [cite press release|url=http://www.archos.com/corporate/press/press_releases/PR_ARCHOS_Gen_5_Availability.pdf|title=ARCHOS Generation 5 Available Worldwide|publisher=Archos|date= 2007-09-12|accessdate=2007-12-05] Manufacturers have since implemented abilities to view images and play videos into their devices.
Although online music services such as
RealNetworks’ Rhapsody also offer legal downloads through a subscription plan, the launch of the iTunes Storein 2003established the model of selling individual songs and albums for purchase.
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 memoryor a miniature hard disk drive, an Embedded processor, and an audio Codecmicrochip to convert compressed sound into analog form that is then played through the speaker jack.
Most DAPs are powered by
rechargeable batteries, some of which are not user replaceable. Listening to music stored on DAPs is typically through earphonesand stereo systems connected with a 3.5 mm jack.
Digital audio players are generally categorized by storage media:
* "Flash-based Players": These are non-mechanical solid state devices that hold digital audio files on internal
flash memoryor removable flash media called memory cards. Due to technological advancements in flash memory, these originally low-storage devices are now available commercially ranging up to 32 GB. [cite press release|url=http://asia.creative.com/corporate/pressroom/releases/welcome.asp?pid=12867|title=Creative Introduces the World's First 32GB Flash Memory-based Portable Media Player with the Latest Credit-Card sized ZEN|date= 2007-12-03|accessdate=2007-12-04|publisher=Creative] Because they are solid state and do not have moving parts they require less battery power and may be more resilient to hazards such as dropping or fragmentation than hard disk-based players. Basic MP3 player functions are commonly integrated into USB flash drives.
* "Hard drive-based Players" or "Digital Jukeboxes": Devices that read digital audio files from a
hard disk drive(HDD). These players have higher capacities currently ranging up to 250 GB. [cite web|url=http://secure.serverlab.net/shop/merchant.mvc?Screen=PROD&Product_Code=5250&Category_Code=ESP&Store_Code=T00107|title=Wolverine ESP 250 GB|publisher=Wolverine Data|accessdate=2008-01-02] At typical encoding rates, this means that thousands of songs can be stored on one player.
MP3 CDPlayers": Portable CD players that can decode and play MP3 audio files stored on CDs.
Networked audio players": Players that connect via (WiFi) network to receive and play audio. [ [http://devices.natetrue.com/musicap/ DIY Networked Audio Player] ]
Common audio formats
MP3is the dominant format, and is nearly universally supported. [cite web|url=http://gale.cengage.com/reference/peter/200712/amazon.htm|title=Péter's Digital Reference Shelf - Amazon MP3|accessdate=2008-04-17] The main alternative formats are AAC and WMA. Unlike MP3, these formats support DRM restrictions that are often implemented into files from paid download services. Open sourceformats, which are completely patent-free, are available - though less widely supported. Examples include Ogg Vorbis, FLAC, and Speex. Finally, a recent newcomer is MPEG 4, which is quickly starting to receive adoption by several digital audio players.
Although these issues aren't usually controversial within digital audio players, they are matters of continuing controversy and litigation, including but not limited to content distribution and protection, and
digital rights management(DRM).
Lawsuit with RIAA
Recording Industry Association of America(RIAA) filed a lawsuit with Diamond Multimediafor its Rio players, [cite court|litigants=RIAA v. Diamond|court=9h Cir.|date= 1999-06-15|url=http://www.ca9.uscourts.gov/ca9/newopinions.nsf/04485f8dcbd4e1ea882569520074e698/ddc79aee7dcda44288256e5a007184a3?OpenDocument official documentation.] alleging that the device encouraged copying music illegally. But Diamond won a legal victory on the shoulders of the Sony Corp. v. Universal City Studios case and DAPs were legally ruled as electronic devices. [cite web|url=http://www.virtualrecordings.com/rio.htm|title=Court Gives "Go-Ahead" to Digital Music Revolution|publisher=Virtual Recordings|last=Gross|first=Robin D|accessdate=2007-12-05]
Comparison of portable media players
USB mass storage device class
Internet radio device
Media Transfer Protocol
* [http://www.antiqueradio.com/Dec04_Menta_mp3pt1.html Collecting MP3 Portables – Part I] , [http://www.antiqueradio.com/Apr05_Menta_mp3.html Part II] and [http://www.antiqueradio.com/Jul05_Menta_MP3s.html Part III] -
Richard Menta's three-part article covers the first digital audio players on the market with pictures of each player.
* [http://www.howyourelectronicswork.com/2008/07/ipods-other-mp3-players.html How Your Electronics Work: MP3 Players] - Detailed explanation of engineering concepts and architecture used to build DAPs.
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Look at other dictionaries:
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