Digital filter, digital signal processing method, and communication apparatus
US6192386A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1998 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Dec 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0657
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital filter according to the invention is an x-time interpolation (x is an interpolation ratio) type FIR filter. The digital filter is provided with a plurality of stages of delay elements into which serial data are inputted, and a plurality of data distributors which distribute the respective output data of the plurality of stages of delay elements into x different signal channels by a time-sharing system. The respective data distributors operate a rate higher by x times than the input rate of serial data and distribute data into x different channels by time-sharing. Preferably, by utilizing the symmetry of a digital filter coefficients, only the digital filter coefficients corresponding to the half taps at one side of the digital filter are prepared, wherein the respective output data of a pair of delay elements located at the symmetrical positions are inputted into one data distributor, and the respective data are distributed by a time-sharing system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.