Time-reversed infinite impulse response digital filtering
US5627859A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1994 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Jul 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital filter includes a first memory device, a filter with at least one pole, i.e., a pole filter, coupled to the first memory device, and a second memory device coupled to the pole filter. The first memory device sequentially stores a digital signal in a forward sequence, and the pole filter sequentially reads the stored digital signal from the first memory device in a reverse sequence, thereby creating a time-reversed signal. The time-reversed signal is filtered by the pole filter, and is then stored as a filtered time-reversed signal in the second memory device in the forward sequence. A data signal is generated by the second memory device by reading the filtered time-reversed signal from the second memory device in the reverse sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.