Linear phase FIR sinc filter with multiplexing
US6321246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1998 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Sep 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2218/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase shifter is implemented using a polyphase filter. The filter is preferably a linear phase Finite Impulse Response (FIR) filter. The amount of delay imparted by the phase shifter is determined by a particular set of coefficients selected from a plurality of such coefficients. Storage requirements are reduced by taking advantage of symmetries in the coefficients for the filters. Memory requirements are further reduced by partitioning the polyphase filter into two polyphase filters and using one to set a rough delay amount and the other to set a fine delay amount between rough delay amount settings. The particular amount of delay may be set by an external synchronization signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.