Charge summing filter aperture corrector
US4275315A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1979 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Oct 10, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optically scanned monolithic focal plane array includes an on-chip aperture corrector interposed between the photodetector output register and the multiplexer, thereby providing data to the aperture corrector in an order parallel to the direction of optical scan, advantageously eliminating any requirement of additional hardware for demultiplexing, memory or timing functions. The desired transfer function is achieved by providing a supplementary source of charge flow in addition to the photodetector signal, the supplementary charge flow being reduced in response to each signal charge packet at first and second intervals which are advanced and delayed respectively with reference to each corresponding signal charge packet by a selected interval. This reduction is proportional to a portion p of the signal charge packet which is determined by adjustment of bias voltages controlling injection of supplementary charge without requiring a charge splitting mechanism. The resulting transfer function boosts the high frequency response of the system, thereby providing aperture correction to compensate for high frequency attenuation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.