高速电路设计技巧\sect3

高速电路设计技巧sect3
SECTION 3
RF/IF SUBSYSTEMS
Walt Kester, James Bryant, Bob Clarke,
Barrie Gilbert

DYNAMIC RANGE COMPRESSION
In many cases, a wide dynamic range is an essential aspect of a signal, something to
be preserved at all costs. This is true, for example, in the high-quality reproduction
of music and in communications systems. However, it is often necessary to compress
the signal to a smaller range without any significant loss of information.
Compression is often used in magnetic recording, where the upper end of the
dynamic range is limited by tape saturation, and the lower end by the granularity of
the medium. In professional noise-reduction systems, compression is "undone" by
precisely-matched nonlinear expansion during reproduction. Similar techniques are
often used in conveying speech over noi