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What is an MP3 player to portable media player?

A digital audio player (DAP), more commonly known as a href = "http://www.roxssun.com"> MP3 player is a consumer electronics device that stores, organizes and plays audio files. Some are also known PAD as portable media players, as image viewing and / or video playback support. MP3 players are regularly included on phones phones, making the most common form of digital audio player. In short, an MP3 player is a portable device that plays digital music files – although many MP3 players can do much more than that. Have been developed from the portable cassette and CD players have built in the 1980s and 90s. Instead large or zero tape subject to the CDs, most players play MP3 files stored on the device. Apart from a pair of headphones, no you need to do anything extra to enjoy your music collection.

An MP3 is a compressed digital audio file to a standard defined by the Motion Pictures Expert Group (MPEG). most MPEG was formed to develop techniques to process digital video, since video also contains audio, MP3 was developed as an extension Audio of this work. Its official name is "MPEG-1 Layer 3, MP3 is a lossy compression algorithm that uses psychoacoustic modeling to reduce the size of audio files up to 90%.

Psychoacoustics advantage of weaknesses in the human auditory system to build digital bits that correspond to sounds that can be heard. The human ear can hear sounds mild in the presence of loud sounds with similar frequency, for example, a voice conversation becomes inaudible when a plane flies low. This effect is known as interference hearing and makes sounds correctly rejected not to be missed.

MP3 is a lossy algorithm, meaning that the original bits can not be recreated from the compressed bits. In terms of audience, however, MP3 is lossless because the human ear can not distinguish between a CD and a version properly encoded MP3 of it. MP3 achieve this transparency, a speed of about 256 kilobits per second, or roughly one sixth of the 1.4 megabits per second required by the compact disc format.

MP3 can be recorded at slightly lower rates, saving even more space, but the differences began to appear noise rates below 128 kilobits per second. At these rates slightly lower, MP3 can use a trick known as a common stereo to improve quality. Much of it is left and right audio tracks of audio. Set combines music, as far as possible, usually sounds good and tracks left on a track. Instead of left and right, which is "common" and "different" channels.

Being an open standard, and therefore accessible to all, has played a role important in the widespread adoption of the MP3 file format. Although, such as those carried out by Fraunhofer be patented, there are many implementations of code open. MP3 was originally only MP3 players can be played on computers, but inexpensive laptops as Apple's iPod have been developed since then.

History

The immediate predecessor to the market for digital audio players, portable CD player, which is sometimes considered a device "audio laptop. "

British Kane Kramer designed one of the first digital audio players, which he called the IXI. The 1979 prototype was capable of approximately 3.5 minutes of audio playback, but did not enter into commercial production. The patents expire in 1988. Apple Inc. hired Kramer as a consultant and has presented his work as an example of technology in the field of digital audio players in its dispute with Burst.com about two decades later.

Production DAP first mass was created in 1997 by Saehan Information Systems, which sold its domestic market Mpman "player in the middle of 1998. The South Korean company then licensed the players to Eiger Labs which distributed them now Eiger Labs F10-Mpman mark the North American market during the summer of 1998. The flash players are available in 16 MB of storage capacity.

The Rio PMP300 from Diamond Multimedia was introduced in September 1998, several months after the Mpman. It has been a success during the holidays, with sales exceeding expectations. The interest and investment in digital music were then pushed. Due to the reputation of the actor as the target of a major trial, the Rio is erroneously assumed that the first plan of action.

In 1998, Compaq has developed the first hard drive based DAP with a 2.5 "portable hard drive. He was allowed to electronics Hango (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 announced to be able to take 1200 songs.

In October 2001, Apple Computer (now known as Apple Inc.) unveiled the first generation iPod, the reader 5 GB of hard drive based DAP with a 1.8 "Toshiba drive. With the development of a minimalist user interface and a small form factor, the iPod was initially notable within the community of Macintosh users. In July 2002, Apple introduced the second generation upgrade iPod. It is compatible with Windows computers through Musicmatch Jukebox (now known as Y! MusicMatch Jukebox Music). The iPod series, which expanded to include microdrive and flash Memory players, has become the market leader in the PAD.

In 2002, Archos launched the first portable media player (PMP), the Archos Jukebox Multimedia. Manufacturers have since implemented abilities to view images and play videos on their devices.

In 2003, the first MP3 player have been installed on mobile phones in South Korea, and the first artist to sell songs for download MP3 files directly from mobile phones was Ricky Martin. The diffusion of innovation quickly and in 2005, more than half of all music sold in South Korea has been sold direct to mobile phones. The idea has spread worldwide and in 2005 the top five mobile phone makers Nokia, Motorola, Samsung, LG and Motorola had released Musicphone. In 2006, more than MP3 players were sold in Musicphone all MP3 players independent instead. The rapid increase in Musicphone was quoted by Apple as one of the reasons leading to the development of the iPhone. In 2007, the installed base of Musicphone passed the 1 billion level, and today more than half of all moblie phones in the world has an MP3 player.

Although online music services such as RealNetworks' Rhapsody also offer legal downloads through a subscription plan, the launch of the iTunes Store in 2003 established the model to sell songs and albums for sale.

Transaction

Digital sampling is used to convert an audio wave to a sequence of binary numbers that can be stored in digital format like MP3.

Common features of all players MP3 players are a memory storage device, such as flash memory or miniature hard drive, an integrated processor and an audio codec chip to convert the compressed audio in analog form which is then played through the speaker output.

Over PAD are powered by rechargeable batteries, some of which are not replaceable by the user. Listening to music stored on PAD is typically through earphones and stereo systems connected to a 3.5 mm plug.

Type

digital audio players generally categorized by storage media:

Flash-based players: This is not a mechanical solid conclusion State archives of digital audio in internal flash memory or removable media known as flash memory cards. Technological advances in flash memory, these devices initially low storage are now available in the market for up to 32 GB. Because they are solid state and have no moving parts that require less energy battery and may be more resilient to hazards such as dropping or fragmentation hard drive-based players. The basic functions have been integrated player MP3 USB flash drive.

Hard disk players or Digital Jukebox: The digital playback device for audio files from a floppy disk drive (HDD). These players have higher capacities currently reach 250 GB. At typical encoding rates, which means that thousands of songs can be stored in a player.

MP3 CD Players: Portable CD players that can decode and play MP3 audio files stored on CD.

Players Network Audio Players that are connected via wireless network (WLAN) to receive and play audio files.

Common audio formats

MP3 is the dominant format, and is almost universally admitted. The major alternative formats AAC and WMA. Unlike MP3 formats support DRM restrictions that are often implemented in the download files subscription services. Open source formats, which are completely free of patents are available – though less widely supported. Examples include Ogg Vorbis, FLAC, Speex y.

More Players can play uncompressed PCM in a container such as WAV or AIFF.

Controversy

Although these problems are generally not controversial in digital audio players, are subjects of continuing controversy and litigation, including but not limited to the distribution and content protection and preservation of digital rights management (DRM).

Trials with the RIAA

The Recording Industry Association of America (RIAA) has filed a complaint with Diamond Multimedia for its Rio players, alleging that the device encouraged copying music illegally. But Diamond won a legal victory on the shoulders of Sony Corp. v. Universal City Studios and DBP were declared legally appropriate electronics.

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