Independent analysis of quantiser and predictor used in CCITT 32 kbit/s ADPCM algorithm
A.M. De Lima Araujo, Abraham Alcaim, J.B.B. de Marca · Electronics Letters · 1986
CCITT has standardised an ADPCM coding scheme at 32 kbit/s which employs a quantiser with two speeds of adaptation and an adaptive predictor with six zeros and two poles. The letter investigates the benefits brought by the quantiser and the predictor, independently, when coding speech signals. The results are given in terms of the mean segmental signal/noise ratio, obtained in communication channels with bit error rates equal to 0, 10-4, 10-3, 10-2 and 10-1.