September 2012
Intermediate to advanced
470 pages
12h 44m
English
Content preview from The MPEG Handbook, 2nd Edition
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4
Audio compression
4.1 Introduction
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.
Psychoacoustics can describe how our hearing has finite resolution in time, frequency and spatial domains such that what we perceive is an inexact impression. Some aspects of the original disturbance ...
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