What Is An Mp3 Player Of Portable Media Player?

Digital audio player (DAP), more commonly known as MP3 player device, consumer electronics, which stores, organizes and plays audio files. Some DAP are also known as portable media players, because to watch the video and / or video playback support. MP3 players are now often built into mobile phones, which is the most common form of digital audio players. In short, MP3 player, portable device that has a digital music file - even though many MP3 players are much more than that. Comes with a portable cassette and CD players, which we carry around 1980 and 90 years. Instead of bulky tapes or compact discs, causing scratches, most players play MP3 files directly on the device. In addition to the headset, there is nothing extra you need to enjoy your music collection.



MP3 is a digital audio file compressed using the standard defined by Motion Pictures Experts Group (MPEG). MPEG was formed to develop techniques for digital video, because most of the video also contains audio, MP3 was developed as an audio extension of this work. Officially known as MPEG-1 Layer 3, MP3 is a lossy compression algorithm that uses psychoacoustic modeling to the size of audio files up to 90%.

Psycho Acoustics uses the weaknesses in the human auditory system to drop the corresponding bits of digital sound can be heard. The human ear can not hear soft sounds in the presence of loud sounds similar frequencies, so you hear the call when the jet flew low over the head. This phenomenon is known as auditory masking, and not just destroy it sounds absent.

MP3 is losing the algorithm in the sense that the original documents can not be reflected in the compressed bits. As for negotiations, but MP3 is lossless because the human ear can not distinguish between CD and MP3-encoded version of the good. MP3 bit rate to achieve transparency about 256 kilobits per second, which is approximately one sixth of 1.4 mega bits per second, requiring a compact disc format.

MP3 can be recorded at lower bitrates, saving even more space, but the sound differences begin to appear at a lower level of 128 kilobits per second. This lower transfer speed, you can use a trick known as the Joint Stereo MP3 quality improvement. Audio is usually left and right audio track. Joint Stereo combine, if possible, sounds, and the left and right tracks on one song. Instead, the left and right, and "ordinary" and "different" channels.

As an open standard and is available to all, has an important role in the widely accepted MP3 format. Although the specific implementation, such as the Fraunhofer Institute May be protected by patents, there are many open source implementation. MP3 were originally only playable on the computer, but cheap, such as MP3 players Apple iPod has been developed.

History

Direct predecessor of the market for digital audio player portable CD player, which is sometimes called "portable audio device."

British Kane Kramer designed one of the first digital audio player, which is Ixi. His 1979 prototype was capable of about 3.5 minutes of audio playback, but it was not in commercial production. Related patent expired in 1988. Apple hired Kramer as a consultant and presented his work as an example of the art digital music player during a dispute with Burst.com nearly two decades later.

The first mass-produced DAP was created in 1997, Saehan Information Systems, which sold its domestic "MPMAN" player in the middle of the 1998th South Korean company then licensed the players to Eiger Labs which is a split-now identified as the Eiger Labs MPMAN F10 North American market in the summer 1998th Flash-based players were available in 16 megabytes of storage space.

Rio PMP300 from Diamond Multimedia was introduced in September 1998, several months after MPMAN. It was a success during the holiday, with sales over expectations. Income from interest and investment in digital music were taught. Since the reputation as a destination of great players litigation, Rio is erroneously assumed that the first DAP.

In 1998, Compaq developed the first hard disk for DAP 2.5 "portable drive. Whether a permit to hang Electronics (now known as Remote Solutions), which first sold the PJB-100 (Personal Jukebox) in 1999. Player had initial capacity of 4, 8 gigabytes, which is advertised to be able to hold 1200 songs.

In October 2001, Apple Computer (now known as Apple) introduced the first generation iPod, 5 GB hard disk-based DAP with a 1.8 "Toshiba drive. With the development of minimalist user interface, a small number of iPod is remarkable in the first Macintosh computer community. In July 2002, Apple introduced the second generation of iPod updates. It is compatible with computers running Windows Musicmatch Jukebox (now known as Y! Music Musicmatch Jukebox). iPod series, which has grown in micro flash drive that contains the player, he was leader in the DAP market.

In 2002 he published his first Archos' portable media player (PMP), Archos Jukebox Multimedia. Manufacturers have implemented ways to view pictures and video into their devices.

In 2003, the first MP3 player installed on mobile phones in South Korea and the first artist to download songs as MP3 files directly to mobile phones for sale is Ricky Martin. Innovations spread rapidly and by 2005, more than half of all music sold in South Korea are sold directly to mobile phones. The idea spread around the world, and in 2005 all five major phone maker, Nokia, Motorola, Samsung, LG and Sony Ericsson music phone released. In 2006, more MP3 players sold in music phones than stand-alone MP3 players together. Rapid ascent Apple's music is cited as the main reason for the development of the iPhone. In 2007, the installed base of music phone for 1 billion level, and today, more than half of all Moblie phone in the world of MP3 players.

Although online music services such as RealNetworks 'Rhapsody' also offers legal downloads through a subscription plan to create iTunes Store in 2003 established the model of selling individual songs and albums for sale.

Operation

Digital samples are used to acoustic waves in a series of binary numbers that can be stored in a digital format such as MP3.

Common features of all MP3 players are memory storage devices such as flash memory or miniature hard drive, built-in processor, audio codec chip and compressed audio in analog format, which was then played through the speaker jack.

DAP Most of them are powered by batteries, some of which user is not replaced. Listening to music on the DAP usually through headphones and stereo systems connected with 3.5 mm jack.

Types

Digital music players are usually categorized by storage media:

Flash-based players: These are semiconductor-mechanical devices that include digital audio files on internal flash memory or USB flash media called memory cards. Technological advances in flash memory, the original low-storage devices are now commercially available in a range of up to 32 gigabytes Because they are solid and there are no moving parts that require less battery power and perhaps even more resistant to natural disasters, such as falls or fragmentation than hard drive-based players. Basic functions, MP3 players, are often integrated into USB flash drives.

Hard drive-based player or Digital Jukeboxes: Devices that read digital audio files from your hard drive (HDD). These players have higher capacities currently ranging up to 250 gigabytes in a typical encoding rates, this means that thousands of songs can be stored on one player.

CD-MP3 Players: Portable CD player that can decode and MP3 audio files stored on CD.

Network audio players: Players that connect via (WiFi) network for the reception and audio reproduction.

Often audio formats

MP3 format is dominant, and almost universally supported. The main alternative to the AAC and WMA formats. Unlike MP3, these formats support DRM restrictions, which often is a file from a paid service. Open source format, which are completely patent-free, are available - though less widely supported. Examples include Ogg Vorbis, FLAC and Speex.

Most players will be in a container, such as uncompressed PCM WAV, and AIFF.

Controversies

Although these problems are usually not competing digital music players, things will continue the discussions and disputes, including the distribution and content protection and digital rights management (DRM)