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 ?
today announced its launch of the R2S15500SP, a multi-language decoder LSI for Near Instantaneous Companded Audio Multiplex (NICAM) used in European and Asian TV broadcasts such as PAL and SECAM.
The codec is globally applicable, producing Mu-law and A-law companded output, or a 16-bit linear digital output for direct interface with digital signal processor chips.
For voice transmission, Netlink II uses the companded continuously variable-slope delta-modulation technique that provides toll-quality voice reproduction at a 32-kb/s sampling rate.

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