Nonlinear filter for noise suppression in linear prediction speech processing devices
US5913187A · kind A · utility
7Cited by
5References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1997 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Aug 29, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a linear prediction audio signal processing apparatus, such as a vocoder, including a nonlinear filter to attenuate the residual signal used to excite a linear prediction synthesis filter. The nonlinear filter is capable of reducing the noise component in the signal while keeping only the periodic component of the speech signal. This feature enhances speech quality. The invention also extends to a novel method for processing a residual signal used to excite a linear prediction synthesis filter in order to attenuate wide band additive noise in the speech signal as constructed by the synthesis filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.