Cascade filter structure with time overlapped partial addition operations and programmable tap length
US4785411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1986 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Aug 29, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0211
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A filter structure uses multiple discrete filter circuits which are cascaded to provide a multiple tap filter of programmable tap length. In one form, an FIR filter may be implemented wherein each circuit generates partial sum operands which must be added to provide a filter output. The cascaded circuits perform partial addition operations near simultaneously by using a serial addition which is synchronized with a start bit. The number of taps in the filter structure implemented by the cascaded discrete filter circuits is variable and may be programmed with a programmable storage register in each discrete circuit which stores operand data fixing the tap length of each discrete circuit. The multiple filter circuits provide a single filter structure with a large tap length and high sampling rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.