Automatic amplitude control circuit for a vector scope
US5589877A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1995 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | May 17, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal processing circuit for a vector scope adapted to display and measure characteristics of a color video signal on a screen which comprises a variable gain circuit 3, a demodulation circuit 6, timing signal generator 7, amplitude detection circuits 8,9, memory 12 storing a reference amplitude and CPU11. An input signal V.sub.in through the variable gain circuit is supplied to demodulation circuiting from where chrominance components R-Y, B-Y are provided to the amplitude detection circuits. When the timing signal is provided to the amplitude detection circuits, the circuits detect their amplitudes. The CPU computes an amplitude of a burst signal in accordance with the detected amplitudes and the difference between the computed amplitude and the reference amplitude stored in the memory. If the difference is not zero, the CPU controls the variable gain circuit so that it become zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.