Apparatus and method for a reduced complexity tap leakage unit in a fast adaptive filter circuit
US6286021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1998 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Oct 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/426
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a fast adaptive filter unit, an update unit replaces the multiplier unit which generates a product of the filter constant, the error signal and data signal and adding this product to a previously generated coefficient with a reduced complexity unit. The reduced complexity unit determines the sign of the product and whether the product is zero or non-zero. As a result of this determination a two bit signal is generated which is used to either increment or decrement the count in a register in the counter unit. The count held by the register is the coefficient signal, the coefficient signal being updated by each additional operation. In order to prevent the register from over-flowing, a second counter applies a signal periodically to the counter unit which decrements the magnitude of coefficient signal stored in the register by one count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.