Low-power pulse-shaping digital filters
US6308190A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2218/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method, apparatus, article of manufacture, and a memory structure for low power digital filtering. The method comprises the steps of successively delaying each of the input values {x.sub.0,x.sub.1, . . . ,x.sub.N-1 } to create tap values {t.sub.0,t.sub.1, . . . ,t.sub.N-1 }, multiplying each of the tap values {t.sub.0,t.sub.1, . . . ,t.sub.N-1 } by A.cndot.{h.sub.0,h.sub.1, . . . ,h.sub.N-1 } to produce {At.sub.0 h.sub.0,At.sub.1 h.sub.1, . . . ,At.sub.N-1 h.sub.N-1 }wherein values {h.sub.0,h.sub.1, . . . ,h.sub.N-1 } are weight values selected to achieve a desired filter response and A is a factor selected to improve computational efficiency in filtering the input data stream, summing the values {At.sub.0 h.sub.0,At.sub.1 h.sub.1, . . . ,At.sub.N-1 h.sub.N-1 } to produce ##EQU1## biasing the summed values {At.sub.0 h.sub.0,At.sub.1 h.sub.1, . . . ,At.sub.N-1 h.sub.N-1 } to compensate for the modified filter tap values and to produce a digital filter output. The article of manufacture comprises means for performing the above method steps. The apparatus comprises an interconnected series of k stages wherein k={1,2, . . . ,N-1}. Each of the stages comprises a delay element Z.sub.k.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.