Signal processing system and method
US4541687A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Sep 2, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06G7/195
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for processing of multifrequency input signals to provide a Fourier transform output is provided which can, for example, partition a wide input frequency band into a number of narrow bands and concurrently detect the presence of one or more signals of different frequency in the input. An array of input wave energy transducers is energized with the broadband signal, and by virtue of progressive shifting of the transducers relative to the propagating medium (such as a surface acoustic wave substrate) generates one or more composite wavefronts dispersed at frequency dependent angles. An array of output transducers are disposed along a focal region, each responding to wave energy within a specific frequency range received at its location due to dispersion of the composite wavefront. Such systems preserve phase coherence while responding to multiple input frequencies, but are compact and mass producible at relatively low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.