Digital zero IF selectivity section
US4733403A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | May 12, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0092
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is a digital zero-IF selectivity section circuit which operates on a recovered input signal, digitally clocked by a first clock at a rate of FS, in receiver device. The circuit uses a second clock operating at a lesser rate than the first clock to clock an N-order FIR digital filtering means to selectively band-limit the frequency spectrum of the recovered input signal. A second digital filtering means is coupled to the output of the first FIR digital filtering means. The second digital filtering means operates at a clock speed less than or equal to the second clock speed. The second digital filtering means is used to further selectively band-limit the frequency spectrum of the recovered input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.