Scanning velocity modulation system
US4185301A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1978 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | May 30, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/32
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for compensating image contour by modulating a scanning velocity in accordance with a video signal is disclosed, in which a mean current dissipated in a driving power amplifier is detected to control a gain of an amplifier in a preceding stage for suppressing the increase of power dissipation in the power amplifier when a video signal having many noises is received. The preceding stage amplifier is provided with a saturation characteristic to enhance the effect of contour compensation at a small amplitude signal and eliminate over compensation of image contour at a large amplitude signal. The combination of the saturation characteristic and the gain control further enhances the effect of suppression of power dissipation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.