MP3 is a format, the Intelligent Image Experts Group (MPEG) as part of the MPEG-1 has been developed, adopted and extended to MPEG-2Norm. The first subgroup MPEG – Audio Group has been developed by several teams of engineers at Fraunhofer IIS, University of Hannover, AT & T Bell Labs, Thomson-Brandt, and other formats CCETT [7] MPEG-1 audio (MPEG-1 Part 3 ). , Including MPEG-1 Audio Layer I, II and III was smart as a project committee ISO / IEC approved in [8] [9] was completed in 1992 [10] and published in 1993 (ISO / IEC 11172 -3 1991: 1993 [5]). Added support for MPEG-2 (MPEG-2 Part 3) bit rates and sample ratespublished in 1995 (ISO / IEC 13818-3:1995). [6] [11]

The use in MP3 of a lossy compression algorithm is designed to greatly reduce the amount of data needed to ensure the audio recording and still sound like a right onto the main road that uncompressed audio reproducing most listeners. An MP3 file through the creation of 128 kbit / s will be created in a file that is about 11 times lower ahead [Note 1] that the CD file created from the main audio source. An MP3 file can also be constructedwith bit rate higher or lower quality, higher or lower result.

The compression works by reducing accuracy in different parts of the sound quality of sound is determined by the resolution of most people. This formula is known as perceptual coding. [13] It uses psychoacoustic models to eliminate or reduce precision of components less audible to human ears, and then records the data remaining in a productive manner.

[1] Other types of electronic devices such asCell phones, Internet tablets and digital cameras are sometimes referred as PMPs because of their ability to reproduce.

[2] This story is so concentrated in some devices, the primary function of the content presented.