A generalized adaptive quantization system with a new reconstruction method, for noisy transmission

To cope with the effects of channel errors, robust adaptive quantization schemes contain a leakage parameter in the step size adaptation algorithm. Unfortunately, this mechanism also introduces its own distortion. A method for compensating for the leakage-induced distortion is proposed here. It consists of a quite novel generalization of the adaptive quantizer with the novelty contained entirely in the decoding procedure. The generalization is illustrated by a PCM and a DPCM example. In both examples the generalized systems perform consistently better than existing systems and give improvements in SNR of about 100% for signal intensities at the extremities of a 50 dB range.