Park also introduces the technique of "companded
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.
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.
Jovanovic, "Support region estimation of the product polar companded
quantizer for Gaussian source", Signal Processing, vol.
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).
where [w.sub.n] is the AWGN noise and [t.sub.n] is the companded signal.
From the Section III of , it is straightforward to obtain the adaptive companding function (without considering the variation of the average power): Let the companded signal follow Rayleigh distribution in the interval [0, A] and uniform distribution in the interval [A, G], where A and G are the companding transition point and cutoff point, respectively.
The proposed transform is derived by formulating design criteria for the optimization of BER and OBI performances of the companded signal.
Consequently, companded signals suffer from elevated BER and OBI as compared to the original signal.
For a desired output PAPR [PAPR.sub.des] and average power [[sigma].sup.2.sub.x], the maximum amplitude [a.sub.m] in the companded signal is computed as follows: