The inclusion of a pole-zero vector predictor in the backward loop of an AVPC coder[1] is approached . We hope to reach the same profit shown by the pole-zero predictor in the ADPCM-CCITT standard. By using a VLMS transversal algorithm the obtained behaviour does not outperform the all-pole scheme. We argue it is due to the dependence on the eigenvalues spread of the LMS perfomance. By using an orthogonalized-lattice structure this problern can be overcame . The zeros term shows an aditional advantage consisting in the removal of the artificial correlation introduced by the pole term of the predictor. This Ieads to a better profit of the VQ ability and a good coding perfomance of the whole system.