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Iterative approach for design of switched-predictive vector quantizers

ZOU Xia1,WEN Chuanhua2,ZHANG Xiongwei1,ZHANG Yafei1,ZHANG Xuhui3(1.College of Command Information System,PLA Univ.of Sci.&Tech.,Nanjing 210007,China; 2.Operations Research Automation,Nanjing Army Command College,Nanjing 210045,China; 3.Unit No.75763 of PLA,Guangzhou 510510,China)  
An iterative design approach of switched-predictive vector quantizers was proposed.Firstly,training vectors were classified according to the correlation between consecutive vectors.Predictive vector quantizers were designed for each class.Then the training vectors were classified again according to the quantization distortion with the switched-predictive vector quantizer.Designing switched-predictive vector quantizer and classifying the training vectors were alternated.The switching mechanism can improve the performance of the design.With linear spectrum pairs of speech as experimental data,the simulation results show that the iterative can lower the quantization distortion and improve the quality of signal compression.
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