Generating the variable control parameters of a speech signal synthesis filter
US6016468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1993 |
| Grant date | Jan 18, 2000 |
| Priority date | — |
| Expiry date | Jul 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2019/0014
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A codebook excited speech coder analyzes speech to produce coefficients of a synthesis filter, the parameters of a long-term prediction filter (LTP) and a codeword indication one of a set of excitations. The results are transmitted to a receiver where they can be used to resynthesize the speech. The LTP and excitation analysis involve generation of impulse response products by adding additional terms to products already formed and storing them in a store. Multiplication of these products by excitation terms is performed using a pointer table storing precalculated addresses of locations in the store. If some excitations are shifted versions of others, some addresses can be obtained by modifying other addresses. The LTP analysis may include selection between a simple delay prediction and a prediction including the sum of two differently delayed terms, to provide improved predictor delay resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.