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MP3

admin — Thu, 18 Oct 2007 07:51:07 +0000

MP3 is also known as MPEG-1 Audio Layer 3 and is an audio encoding format for music and other audio formats.

It uses a “lossy” compression algorithm that is designed to greatly reduce the amount of data needed to represent an audio recording. It still sounds like a faithful reproduction of the original uncompressed audio to most listeners.

It was invented by a group of European engineers at Philips, CCETT, IRT and the Fraunhofer Society. They worked in the framework of the EUREKA 147 DAB digital radio research program. It became an ISO/IEC standard in 1991.

See also

About the MP3 compression

admin — Thu, 18 Oct 2007 07:50:56 +0000

MP3 is an audio-specific format that involves compression.
MP3 removes certain parts of sound that are out of the hearing range of most people. It provides a representation of pulse-code modulation, which is encoded audio in a considerably less space than using straightforward methods. It uses psychoacoustic models to discard those components that are less audible to human hearing and records the remaining information in an efficient manner, similar to how JPEG works.

The psychoacoustic masking codec was first proposed independently by MA Krasner in the US and Manfred Schroeder in Germany. The immediate predecessor of the Mp3 and its first practical implementation was an implementation of psychoacoustic transform coder on Motorola 56000 chips called Optimum Coding in the Frequency Domain or OCF.

MP3 was a direct descendant of that system. Modern lossy bit compression technologies, including MPEG and MP3, are based on the early work of Oscar Bonello of Argentina. He was involved in studio equipment design for broadcast radio automation.

In 1983, he started researching the idea of Critical Band Masking principle in order to reduce the amount of bit stream necessary to encode an audio signal.

He created, in 1987 into the word’s first bit compression system named ECAM.

Modern Mp3

admin — Thu, 18 Oct 2007 07:50:43 +0000

In 1991, there were two proposals available for audio transfer.
These proposals where from Musicam and ASPEC. The Musicam system was chosen due to its simplicity and error robustness, as well as its low computational power. The Musicam format is based on the sub-band coding system and was a key to solving the basis of the MPEG audio compression format.

The first song to be transposed into MP3 was Susan Vega’s song “Tom’s Diner”. After many trials, the Mp3 was ready to go public. On July 7, 1994, the Fraunhofer Society released the first MP3 encoder. The file name .mp3 was selected by the society and the first real time Mp3 player was released in September of 1995.