Electrically reprogrammable transversal filter using charge coupled devices
US4120035A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Aug 16, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2015/026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A charge coupled device analog multiplier is used to weigh the sampled and delayed signals for a transversal filter. The digital filter coefficients for the analog multiplier can be electrically programmed and therefore dynamic time-varying systems, such as matched filters, can be designed with reduced circuit complexity. The digital filter includes means for sampling without destroying an analog signal at various points and providing voltages proportional to each sampled signal. The voltages are separately applied to a charge coupled device analog multiplier which accepts the voltages and provides means for multiplying the digital filter coefficient by the analog voltage. The multiplied sample signal is then dumped into a means for summing all of the weighted sample signals to produce an analog signal modified by the digital filter coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.