发明名称 |
VECTOR QUANTIZER, VECTOR INVERSE QUANTIZER, AND THE METHODS |
摘要 |
<p>A vector quantizer which improves the accuracy of vector quantization in switching over a vector quantization codebook on a first stage depending on the type of feature having the correlation with a quantization target vector. In the vector quantizer, a classifier (101) generates classification information representing a type of narrowband LSP vector having the correlation with wideband LSP (Line Spectral Pairs) out of the plural types. A first codebook (103) selects one sub-codebook corresponding to the classification information as a codebook used for the quantization of the first stage from plural sub-codebooks (CBa1 to CBan) corresponding to each of the types of narrowband LSP vectors. A multiplier (107) multiplies the quantization residual vector of the first stage inputted from an adder (104) by a scaling factor corresponding to the classification information out of plural scaling factors stored in a scaling factor determining section (106) and outputs it to an adder (109) as the quantization target of a second stage.</p> |
申请公布号 |
WO2009047911(A1) |
申请公布日期 |
2009.04.16 |
申请号 |
WO2008JP02876 |
申请日期 |
2008.10.10 |
申请人 |
PANASONIC CORPORATION;SATOH, KAORU;MORII, TOSHIYUKI;EHARA, HIROYUKI |
发明人 |
SATOH, KAORU;MORII, TOSHIYUKI;EHARA, HIROYUKI |
分类号 |
G10L19/14;G10L19/00;G10L19/02;G10L19/032;G10L19/06;G10L19/07;G10L19/18 |
主分类号 |
G10L19/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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