companding

companding

Download Acoustical Society of America Standards

Compressing and expanding. A device (or pair of devices) that compress a signal and then expands the signal to keep it within a set range and/or to reduce noise. Used in wireless microphone systems to take the whole audio signal and compress it into a frequency bandwidth that can be transmitted. The receiver expands the signal back into its original frequency range.

Source: Church Audio & Acoustics Glossary

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