Analysis of LSF switched-predictive vector quantisers
Rodrigo C. de Lamare, Abraham Alcaim · 2002
Switched-predictive vector quantisation (SPVQ) has proven to be more efficient than conventional predictive vector quantisation (PVQ) to reduce the bit rate of LSF parameters in speech coding applications. We perform a comparison between different SPVQ schemes and we propose an extension of the SPVQ technique which outperforms previously reported PVQ and SPVQ systems. The proposed method consists of 4 vector quantisers (VQ) which are switched on the basis of the best performance criterion.