A waveform before and after the compression stage of non-linear companding In
telecommunication,
signal processing, and
thermodynamics, companding (occasionally called compansion) is a method of mitigating the detrimental effects of a channel with limited
dynamic range. The name is a
portmanteau of
compressing and expanding.While the compression used in audio recording and the like depends on a
variable-gain amplifier, and so is a locally linear process (linear for short regions, but not globally), companding is non-linear and takes place in the same way at all points in time. The dynamic range of a signal is compressed before
transmission and is expanded to the original value at the receiver.
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