Signal processing circuit and method
US4941051A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1989 |
| Grant date | Jul 10, 1990 |
| Priority date | — |
| Expiry date | Jan 30, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/618
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal processing circuit for processing in real time output signals from a radiation sensing assembly which generates for successive sampling periods output signals representing respectively a reference level and a radiation level related to the radiation incident on a sensor of the assembly during each sampling period. The circuit comprises a low pass filter for receiving the output signals and for filtering a plurality of reference level signals and a corresponding plurality of radiation level signals associated with the plurality of reference level signals to minimize high frequency noise effects on the signals and to generate filtered and averaged reference level and radiation level signals; and a difference circuit for generating a signal related to the difference between the filtered reference level and filtered radiation level signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.