Sliding-window transform with integrated windowing
US7020218B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Nov 26, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5404
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system for a sliding-window transform with integrated windowing is described. The system provides a Direct Fourier Transform kernel with an integrated windowing filter having a desired number of stages. In one embodiment, the windowing filter is a lowpass filter. In one embodiment, the lowpass filter has a rectangular filter transfer characteristic. The DFT includes a complex multiplier. A first portion of the windowing filter is provided before the complex multiplier and can be implemented using real arithmetic. A second portion of the windowing filter is provided after the complex multiplier and is implemented using complex arithmetic. In one embodiment, the filter weights of the second portion of the windowing filter are unity and thus no multiplier is needed for the filter weights in the second portion of the windowing filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.