Everyone listens to music. But CD-quality sound requires large amounts of memory on the medium used to store it. In the 1990s, electrical engineer Karlheinz Brandenburg began to look at ways of compressing audio data without loss of sound quality. The MP3 format was the result. It involved the omission of redundant frequencies that are outside the range of human hearing. The compressed data takes up nearly twelve times less space than the output data, but the difference in quality is practically inaudible to normal ears.
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