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 ?
Accordingly, the companded signals can be recovered correctly through the corresponding inversion function.
Besides, the average power of the companded signals by the proposed scheme is designed to be the same as that of the original MCM signal, i.
Correspondingly, according to (20) and (21), the CCDF expression of proposed companded signals is given by
Follow the analysis in the end of Section 2, the received signal is a distorted version of the companded signal, i.
Moreover, the companded signals have almost no spectral regrowth caused by the PAPR reduction, which can increase the immunity of MCM signals from out-of-band noise.
3 shows the CCDF of the PAPR of original MCM signals, EC companded signals, ErC companded signals and the proposed companded signals, respectively.
3(b) and 3(c) show the power spectral density (PSD) plots of the companding noise, D = T (x) - x, and those of the companded signal, respectively.
This means that the waveform of the companded signal will closely follow that of the original signal.
The compressed amplitudes in the companded signal are larger than [a.
7 shows empirical curves of CCDF of PAPR for original and companded signals.
Evaluation of BER for original and companded signals transmitted over AWGN channel is shown in Figs.
In order to evaluate the performance of companded signals passing through HPA, solid state power amplifier (SSPA) model is used.

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