Dynamic range compression: Difference between revisions

Revision as of 11:42, 7 July 2003

Revision as of 00:35, 8 July 2003

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The term "audio compression", meaning '''audio level compression''', also known as '''companding''', is used in the sound recording and live sound reinforcement fields. In this context, it refers to a process whereby the [[dynamic range]] of an audio signal is reduced.

:Note: This usage should not be confused with [[audio data compression]].

See also: [[Dolby system]], [[mu-law]], [[A-law]]

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In [[telecommunication]], '''companding''' (for '''comp'''ressing and ex'''panding''') is an [[operation]] in which the [[dynamic range]] of signals is compressed before [[transmission]] and is expanded to the original value at the receiver.

This is typically carried out in analog systems by using a [[voltage controlled amplifier]] which has its gain reduced as the power of the input signal increases.