chapter  4
61 Pages

Audio compression

Physics can tell us the mechanism by which disturbances propagate

through the air. If this is our definition of sound, we have the problem

that in physics there are no limits to the frequencies and levels which

must be considered. Biology can tell that the ear only responds to a

certain range of frequencies provided a threshold level is exceeded. This

is a better definition of sound; reproduction is easier because it is only

necessary to reproduce that range of levels and frequencies which the ear

can detect.