companding


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companding

[kəm′pand·iŋ]
(electronics)
A process in which compression is followed by expansion; often used for noise reduction in equipment, in which case compression is applied before noise exposure and expansion after exposure.

companding

(1) In the analog world, a method for improving audio reproduction by altering the dynamic range of the signals. On outgoing transmission, it raises the amplitude of weak signals and lowers the amplitude of strong signals. On incoming transmission, it restores the signal to its original form. Such techniques are used in dbx and Dolby noise reduction, AM, FM and SSB radio as well as in voice and musical instrument amplification to reduce feedback. See codec.

(2) In the digital world, a compression technique used in pulse code modulation (PCM). It reduces the number of bits used to represent digital voice samples in the loudest parts of the conversation. See mu-Law, A-Law and codec.
References in periodicals archive ?
For natural sounding communication, the digital audio companding technology helps reduce static hiss between words.
NiMH estimated talk time -- iVOX for speech-activated, hands-free communication -- 7 NOAA/Environment Canada weather channels and 4 marine weather channels -- QT (Quiet Talk) interruption feature which helps eliminate interference -- Backlit display for readability in low lighting conditions -- Companding technology to help filter out static between words -- LCD battery meter for charge indication -- Digital Signal Processing to help provide consistent sound quality -- PTT Power Boost feature
Dual and Quad ISLAC devices are low-voltage CMOS ICs that provide A/D and D/A conversion, filtering, equalization, hybrid balance, companding, supervision, ringing and test functions, and interfaces to an external microprocessor and the digital backplane.

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