A portable audio player is a personal mobile device that allows the user to listen to recorded

audio Audio most commonly refers to sound, as it is transmitted in signal form. It may also refer to: Sound *Audio signal, an electrical representation of sound *Audio frequency, a frequency in the audio spectrum * Digital audio, representation of sou ...

while mobile. Sometimes a distinction is made between a ''portable'' player, battery-powered and with one or more small loudspeakers, and a ''personal'' player, listened to with earphones.

History

Portable battery-operated reel-to-reel tape recorders were introduced in the 1950s, initially tending to be high-priced units for reporters, produced by

Uher Uher may refer to: * Uher (village), a village in Poland * Uher (brand), a German brand of electronic equipment People * Karel Uher (born 1983), Czech curler * Rudolf Uher, Canadian psychiatrist *Štefan Uher Štefan Uher (4 July 1930 – 29 ...

and Nagra. Lower-priced units became available later. In the mid-1960s Philips introduced the battery-operated

compact cassette The Compact Cassette or Musicassette (MC), also commonly called the tape cassette, cassette tape, audio cassette, or simply tape or cassette, is an analog magnetic tape recording format for audio recording and playback. Invented by Lou Otten ...

recorder, originally used for recording speech. At about the same time the 8-track player was introduced. It was very successful at the time, though bulky and inconvenient to use. There was a pause at the end of each track as the program changed. The compact cassette, although physically much smaller than the 8-track cartridge, became capable of good sound quality as the technology developed, and longer cassette tapes became available.

Cassette deck A cassette deck is a type of tape machine for playing and recording audio cassettes that does not have a built-in power amplifier or speakers, and serves primarily as a transport. It can be a part of an automotive entertainment system, a part of a ...

s (not portable) were introduced for home use, and this encouraged the production of pre-recorded music cassettes.

Personal stereo

The first truly personal

cassette player A cassette deck is a type of tape machine for playing and recording audio cassettes that does not have a built-in power amplifier or speakers, and serves primarily as a transport. It can be a part of an automotive entertainment system, a part of a ...

, the Sony Walkman, was introduced in 1979 and sold very well. It was much smaller than an 8-track player or the earlier cassette recorders, and was listened to with stereophonic

headphones Headphones are a pair of small Electrodynamic speaker driver, loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustics (acoustical engineering), electroacoustic transducers, which convert an electrical signa ...

, unlike previous equipment which used small loudspeakers. Unlike small loudspeakers, headphones were capable of very good sound quality. All previous compact cassette devices could record as well as play back; Walkmans and similar devices often had no recording facility, but took advantage of the pre-recorded cassettes that had become widely available.

Disk players

Early personal CD players can play commercial CDs; later models can play recordable

CD-R CD-R (Compact disc-recordable) is a digital optical disc storage format. A CD-R disc is a compact disc that can be written once and read arbitrarily many times. CD-R discs (CD-Rs) are readable by most CD readers manufactured prior to the in ...

and

CDRW CD-RW (Compact Disc-Rewritable) is a digital optical disc storage format introduced in 1997. A CD-RW compact disc (CD-RWs) can be written, read, erased, and re-written. CD-RWs, as opposed to CDs, require specialized readers that have sens ...

media either copied from a pressed CD or containing MP3 and similar files.

Media players

In 1998, digital audio players (DAPs) based on flash memory or

hard disk A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magneti ...

storage became available (The

Rio PMP300 The Rio PMP300 is one of the first portable consumer MP3 digital audio players, and the first commercially successful one. Produced by Diamond Multimedia, it was introduced September 15, 1998 as the first in the "Rio" series of digital audio pla ...

from Diamond Multimedia is widely considered to be the first mass market DAP). Files are usually compressed using

lossy compression In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used to reduce data size ...

; this reduces file size at the cost of some loss of quality. The

trade-off A trade-off (or tradeoff) is a situational decision that involves diminishing or losing one quality, quantity, or property of a set or design in return for gains in other aspects. In simple terms, a tradeoff is where one thing increases, and anot ...

between degree of compression and file size can be varied, although this is not an option for existing compressed files. The advantage of solid-state DAPs over hard disks and CDs is resistance to vibration, small size and weight, and low battery usage. Early solid-state DAPs had capacities of a few tens of kilobytes; capacities of many gigabytes are available.

References

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History

Personal stereo

Disk players

Media players

Further reading

See also

References