Half-duplex echo canceler training using a pilot signal
US5828657A · kind A · utility
18Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/238
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A far-end modem transmits a "pilot tone" during the time that a near-end modem is training its echo canceler. Correspondingly, the near-end modem is modified to notch, or filter, out this pilot tone from the received signal. The filtered received signal is then used by the near-end modem to train its echo canceler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.