Automatic level adjusting system for a television receiver
US4930004A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1989 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Mar 31, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/73
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic level adjusting system for a television receiver which is suitable as its automatic white balance adjusting circuit. In the manufacturing-process of the television receiver, desired data is selected from a positional data group of black or white reference pulse signal to be inserted into a video signal and is stored in a non-volatile memory, whereby when an image is reproduced, black or white level of the video signal is adjusted automatically on the basis of the data stored in the non-volatile memory. Thus, the insertion position of black or white reference pulse signal can be changed without modifying the hardware of the television receiver so that the automatic level adjusting system can be applied commonly to different types of television receivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.