About MP3

I guess most people have heard about mp3. For those ho haven't I will try go get a short introduction. MP3 is a way to compress digital audio. Digital audio is impossible to compress to less than half the size if you want the uncompressed information to be unchained. There fore you must cheat a little bit when you compress digital audio. The only way is to split the audio signal into frames and for every frame you then must find the frequencies and their values. Many frequencies can be removed because you do not hear them. For example man can only hear two signals at the same time if the difference between them are less than 50 dB, For example if one signal is 90 dB every signal less than 40 dB can be removed since you never hear them. At lest a normal person doesn't hear them. There are only one type of songs where I've been able to heard the difference between a wave and an mp3 file and that are songs with slide or steal guitar combined with a fast echo on the guitar. If you are a trained musician and have good hearing and if you have a really good sound board, then maybe you are able to hear the difference between a wave and an mp3 file. In basics the mp3 files stores time frames and for every time frame they store the frequencies and the frequencies value.

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