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Compression and Decompression for Multimedia Systems Methods of compression techniques in existing voice mail systems There are many different ways to compress a file containing voice data. These methods include LPC, LPC-10, CELP, MP3, MP4. All are lossy methods, this means that some of the original data has been removed in a way that the end result will not sound much different from the original recorded wave form. This method works in a similar way to that of JPEG picture compression. Irrelevant data is removed, this could be silences or removing higher or lower frequency ranges then the human ear can distinguish, doing so makes the resulting file size a lot smaller. LPC 'Linear Predictive Coding' gives the best compression of all available algorithms, as it reduces the data rate by more than a factor of 12. This method gives the greatest degree of compression of any of the current available techniques. The...

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