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What is MP3

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What is MP3?

Its full name is MPEG – 1 audio Layer 3; it is a compressed digital audio format, created by the company Moving and Picture Expert Group (MPEG), this format was developed specifically by Karlheinz Brandenburg, who was the technology director of the Fraunhofer IIS Institute.

 

This institute was a German research center, which, with Thompson Multimedia, controls all the MP3 patents. This format’s distribution started back in 1995 and it was not very popular until 1991; but it was not until July in 1995 when this company starts using another format called .MP3, which did not occupied much of the computer’s memory and was very flexible. This company got 1.2 millions of Euros with the patent concept, ten years later, this amount increased to up to 26.1 million of Euros.

The MP3 format was so successful that it became the standard that the streaming audio used in high quality, because it provided the opportunity of compressing the file in proportion to its size by second, this is why some files that used to weight around 15 MB, could diminish their weight to just 1 MB with this type of conversion, thanks to this, the MP3 files were very successful through the Internet.

In 2002, other formats, which were very much alike MP3, were include in various operative systems; other formats have also been created through the Internet, this help in foreseeing that the MP3 format was slowly decaying, due to the fact that the patent that it possesses was not from an open code and each time a codec is used for it, it had to be paid.

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Even though many formats, which are similar to MP3, have been launched, it has not become less popular among the users nor the Internet, quite the opposite, because it has become even more successful.

They way in which this algorithm works is through the perceptual codification, because it is a compression system with a loss, which means that the original sound, which has not gone through the codification or compression process, it is not the same with which it has been transformed, this losses can only be picked up through special devices that measure the decibel level, meaning that the human ear cannot pick up these losses, because we only sense certain frequency of sound and this contributes with the fact that we do not perceive any disturb or loss when we are listening to audio in MP3.

A sub band codification system is used, which determined which frequencies are going to be eliminated and which are not; they follow a process that compares the original with the psychoacoustic model, and it determined which the most important band is and which can be deleted. For example, in a compact disc we have a 44.1 Khz 16 stereo bit wave, which means, approximately, 14000 kbps, but codifying at 128 kbps, we would obtain a 1/12 reduction of the initial space; this type of codification is the best one and the one that most companies use as a standard, given to the fact that by increasing the codification, the best quality can be loss, and this can be verified when listening to the audio.




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