Band pass and notch filters for echo reduction with less phase distortion
US6608898B1 · kind B1 · utility
5Cited by
10References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1999 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Oct 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A complementary comb filter includes a plurality of band pass filters and a plurality of notch filters, wherein the notch filters have the same center frequencies as the band pass filters or the same center frequencies as the dead bands defined by the band pass filters. Phase distortion by the notch filters occurs primarily in the notch, thereby eliminating distortion of the signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.