Adaptive noise suppressor
US4658426A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 10, 1985 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Oct 10, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2225/43
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adaptive noise suppressor for providing noise filtered signals. The noise suppression device employs a vector gain .mu. for the weights of the filter wherein the vector .mu. is selected for each frequency bin to be inversely proportional to the power spectrum. A projection operator is utilized to remove the effects of circular convolution to produce a linear convolution result wherein the weights are readjusted in a manner to minimize the difference between the input signal and the filter output signal, thereby minimizing the error signal to produce a noise suppressed signal in the filtered output. A frequency suppression device utilizes the same principles of the vector .mu. and projection operator, but the output is taken from the error output of the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.