Symmetric transposed FIR digital filter
US5339264A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Jul 27, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2017/0692
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A finite impulse response (FIR) digital filter (100, 170, 175, 180) incorporates both symmetric and transposed structures in a configuration that suites ASIC implementation. The filter coefficients can be arranged in ascending order to implement coefficient block floating point, or in descending order. To further facilitate coefficient block floating point, filter coefficients are chosen so that each cell has an exponent value equal to or greater than that of a preceding cell. A right shift is provided between adjacent cells to equate the exponent value of a sum output of a preceding cell with that of the succeeding cell. Variable decimation is provided by downloading appropriate filter coefficient and adjusting a decimation forward clock. Multiple channels can also be accommodated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.