Balanced A/D converter
US5121117A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1991 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Mar 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A balanced A/D converter system for a video signal. A clamp reference, corresponding to synchronizing pulse magnitude, is developed. The output of an A/D converter is summed with the clamp reference to develop a first correction signal for offsetting the video signal to the synchronizing pulse back porch level at the input of the A/D converter. A peak video reference signal is developed and summed with the output of the A/D converter to develop a second correction signal for controlling the gain of a variable gain amplifier coupled to the input of the A/D converter. Offsetting the video signal to the back porch level and amplifying the video signal based upon its maximum level enables the full utilization of the total range of the A/D converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.