Digital signal processing apparatus
US5699363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1995 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | Jul 20, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J1/05
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital signal processing apparatus for frequency multiplexing and demultiplexing of narrow band FDM signals has a first block fine processing stage (11) connected in series to a first block coarse processing stage (16, 17) and in parallel therewith a second block fine processing stage (11a) connected in series to a second block coarse processing stage (16, 17). The two stages 11 and 11a are coupled together at one side remote from the two coarse processing stages (16, 17) to provide a first port (14) and the stages (16 and 17) at the side remote from the port (14) provide a plurality of ports (15). Each stage (11, 11a) is a FIR lowpass filter and each stage (16, 17) incorporates a polyphase filter (16) in connection with a Fast Fourier Transform Unit (17).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.