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1.发明授权METHOD AND SYSTEM FOR MULTI-RATE LATTICE VECTOR QUANTIZATION OF A SIGNAL 有权方法和系统多速率基于网格的VECTOR QUANTIZE的一种信号
公开(公告)号：EP1514355B1
公开(公告)日：2009-08-19
申请号：EP03727093.1
申请日：2003-05-30
申请人： Voiceage Corporation
CPC分类号： G10L19/10 , G10L19/06 , G10L2019/0008 , H03M7/3082
摘要： The present invention relates to a method and system for multi-rate lattice vector quantization of a source vector x representing a frame from a source signal to be used, for example, in digital transmission and storage systems. The multi-rate lattice quantization encoding method comprises the steps of associating to x a lattice point y in a unbounded lattice Lambda; verifying if y is included in a base codebook C derived from the lattice Lambda; if it is the case then indexing y in C so as to yield quantization indices if not then extending the base codebook using, for example a Voronoi based extension method, yielding an extended codebook; associating to y a codevector c from the extended codebook, and indexing y in the extended codebook C. The extension technique allows to obtain higher bit rate codebooks from the base codebooks compared to quantization method and system from the prior art.
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2.发明公开METHOD AND SYSTEM FOR MULTI-RATE LATTICE VECTOR QUANTIZATION OF A SIGNAL 有权方法和系统多速率基于网格的VECTOR QUANTIZE的一种信号
公开(公告)号：EP1514355A1
公开(公告)日：2005-03-16
申请号：EP03727093.1
申请日：2003-05-30
申请人： Voiceage Corporation
CPC分类号： G10L19/10 , G10L19/06 , G10L2019/0008 , H03M7/3082
摘要： The present invention relates to a method and system for multi-rate lattice vector quantization of a source vector x representing a frame from a source signal to be used, for example, in digital transmission and storage systems. The multi-rate lattice quantization encoding method comprises the steps of associating to x a lattice point y in a unbounded lattice Lambda; verifying if y is included in a base codebook C derived from the lattice Lambda; if it is the case then indexing y in C so as to yield quantization indices if not then extending the base codebook using, for example a Voronoi based extension method, yielding an extended codebook; associating to y a codevector c from the extended codebook, and indexing y in the extended codebook C. The extension technique allows to obtain higher bit rate codebooks from the base codebooks compared to quantization method and system from the prior art.
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