Speech coding apparatus
US5138662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Apr 13, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2019/0004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A speech coding apparatus which selects an optimum code from a code book, the optimum code giving the minimum magnitude of error signal between the input signal and the reproduced signal obtained by a filter calculation using a linear prediction parameter from a linear predictive analysis unit with respect to the codes of the code book, wherein the code book is formed by thinning to 1/M (M being an integer of two or more) the plurality of sampling values constituting the codes. To compensate for the deterioration of the quality of the reproduced signal caused by thinning the sampling values in this way, an additional linear predictive analysis unit is further introduced and use made of an amended linear prediction parameter instead of the linear prediction parameter from the originally provided linear predictive analysis unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.