发明名称 |
MULTI-SEGMENT VECTOR QUANTIZER FOR A SPEECH CODER SUITABLE FOR USE IN A RADIOTELEPHONE |
摘要 |
A Vector-Sum Excited Linear Predictive Coding (VSELP) speech coder provides improved quality and reduced complexity over a typical speech coder. VSELP uses a codebook which has a predefined structure such that the computations required for the codebook search process can be significantly reduced. This VSELP speech coder uses single or multi-segment vector quantizer of the reflection coefficients based on a Fixed-Point-Lattice-Technique (FLAT). Additionally, this speech coder uses a pre-quantizer to reduce the vector codebook search complexity and a high-resolution scalar quantizer to reduce the amount of memory needed to store the reflection coefficient vector codebooks. Resulting in a high quality speech coder with reduced computations and storage requirements.
|
申请公布号 |
CA2135629(C) |
申请公布日期 |
2000.02.08 |
申请号 |
CA19942135629 |
申请日期 |
1994.03.07 |
申请人 |
MOTOROLA, INC. |
发明人 |
GERSON, IRA A.;JASIUK, MARK A.;HARTMAN, MATTHEW A. |
分类号 |
G10L19/04;G10L19/00;G10L19/06;G10L19/08;G10L19/12;(IPC1-7):G10L9/14;H03M7/00;H04B7/24 |
主分类号 |
G10L19/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|