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Sampled data files can be compressed and by doing this one can win on average 50% of the storage space. The amount of possible compression depends on the signal-to-noise ratio in the recordings. A high signal-to-noise ratio results in a better compression.

Compression of telephone speech (A-law or U-law) results in a compression of about 40%, as was experienced during the storage of the Dutch POLYPHONE material. A compression tool that is often used and is recommended here is Shorten by T. Robinson. It is available via anonymous ftp from

EAGLES SWLG SoftEdition, May 1997. Get the book...