Automatic CRT tracking circuit
US4342048A · kind A · utility
5Cited by
13References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1980 |
| Grant date | Jul 27, 1982 |
| Priority date | — |
| Expiry date | Aug 18, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic CRT tracking circuit for a television receiver includes an amplifier having adjustable gain and offset transfer functions for coupling a video signal to the cathode of the CRT electron gun. Feedback loops are used to adjust both the gain and offset transfer functions of the amplifier, either independently of each other or in a common mode, to compensate for changing cathode voltage versus cathode current characteristics such that a desired video signal versus cathode current relationship is achieved despite variations in the CRT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.