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 ?
The rest of the paper is organized as follows: Section II describes the companding system with embedded G.
To restore the original coefficient z at the receiving side, the values of TL, TR, the compressed location map, the companding error e, and the threshold matrix T, called overhead data, should be embedded into the cover image along with the pure payload (namely the watermarking data).
Figures 6a through 6c compare the BW efficiency performance of the DWT & DCT systems with and without companding to that of with exponential transform.
By using the proposed companding transform in Section 3, the MCM signals are companded before they are converted into analog waveforms and amplified by the high power amplifier (HPA).
Tsividis, "Externally linear, time-invariant systems and their application to companding signal processors", IEEE Trans.
Recently, an iterative companding transform and filtering (ICTF) scheme [17] has been proposed in which linear and piecewise linear transforms have been selected due to their low implementation complexity.
In this paper, a new adaptive companding scheme is proposed along with its design methodology.
Dincic, "Simple compression algorithm for memoryless Laplacian source based on the optimal companding technique", Informatica, vol.
Tihung, "Reduction of peak-to-average power ratio of OFDM systems using a companding technique," IEEE Transaction on Broadcasting, vol.
The problem that generaly occurs in designing quantizers, including [mu]-law companding quantizers, is how to provide the simple manner of determining the support region threshold of the quntizer to minimize distortion introduced in the quantization process.
Samuelsson, "Multidimensional Companding Quantization of the Gaussian Source", IEEE Trans.
An A-law algorithm is a standard companding algorithm, used in European digital communications systems to optimize, i.

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