Method and apparatus for utilizing noise reducer to implement voice gain control and equalization
US5937377A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 19, 1997 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A signal pre-processing apparatus for processing signal such that the signal is selectively adjusted for gain and equalization based upon a plurality of parameters predetermined by a noise reducing means. The present invention is a method and apparatus for substantially reducing undesirable noise components of speech signals in speech processing without necessitating added hardware, complexity, or sacrifice in speech signal integrity. In particular, background noise is reduced by means of frequency transformation and modification thus greatly enhancing speech quality without significantly affecting the reconstructed speech. By estimating the noise spectrum continuously from the input signal, the present invention permits modification of the frequency response of the input signal thus reducing the effect of the noise components of the input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.