Channel equalizer and method for cancelling ghosts
US4359778A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1981 |
| Grant date | Nov 16, 1982 |
| Priority date | — |
| Expiry date | Feb 5, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/142
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A channel equalizer and ghost cancelling technique are disclosed for removing ghosts from a communications signal which includes a training signal and data. The training signal and its ghosts are processed as a finite length sequence of numbers. The equalizer includes a chain of cascaded filters, the first of which receives the training signal and its ghosts for assuming a filter condition which reduces the finite sequence by two points at the filter's output. Each successive filter in the chain receives the output of an immediately preceding filter and assumes a filter condition in which an additional two points of the finite sequence are eliminated or forced to zero. The filter conditions assumed in response to the training signal and its ghosts are maintained while the data is applied to the filter chain so that ghosts of the type experienced by the training signal are removed from the data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.