Method and apparatus for frequency selective adaptive filtering
US5644596A · kind A · utility
22Cited by
5References
6Claims
0Family size
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Key dates
| Filing date | Sep 13, 1995 |
| Grant date | Jul 1, 1997 |
| Priority date | — |
| Expiry date | Sep 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2021/0089
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for performing subband adaptive filtering is proposed. A signal is prefiltered by a set of complementary filters to provide corresponding subbands of the input signal. The subbands of the signal are then provided to adaptive filters that filter the subbands separately. The individually filtered subbands are then summed. In an exemplary implementation an echo canceller is presented which employs the subband filtering method and apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.