发明授权
- 专利标题: Comb codebook structure
- 专利标题(中): 梳码簿结构
-
申请号: US09156649申请日: 1998-09-18
-
公开(公告)号: US06330531B1公开(公告)日: 2001-12-11
- 发明人: Huan-Yu Su
- 申请人: Huan-Yu Su
- 主分类号: G10L1912
- IPC分类号: G10L1912
摘要:
A speech encoding comb codebook structure for providing good quality reproduced low bit-rate speech signals in a speech encoding system. The codebook structure requires minimal training, if any, and allows for reduced complexity and memory requirements. The codebook includes a first and at least one additional sub-codebooks, each having a plurality of code-vectors. The codebook may be randomly populated. All even elements may be set to zero in a first codebook, and all odd elements may be set to zero on a second codebook. The resulting comb codebook includes code-vector combination of the code-vectors from the sub-codebooks. In certain embodiments, the code-vectors of the sub-codebooks may contain zero valued elements. In other embodiments where the code-vectors of the sub-codebooks contain only non-zero elements, zero valued elements may be inserted in between the non-zero elements of the sub-codebooks during the forming of the resultant comb codebook. In such an embodiment, the memory requirements would be further reduced in that the zero valued elements need not be stored.