Since hearing is approximately logarithmic, it makes sense to represent
sound samples in a logarithmic or semi-logarithmic number format.
Floating-point numbers in a computer are partially logarithmic (the
exponent part), and one can even use an entirely logarithmic fixed-point
number system. The -law amplitude-encoding format is linear at small
amplitudes and becomes logarithmic at large amplitudes. This section
discusses these formats.