Automatic method for identifying a color TV standard
US5192997A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1991 |
| Grant date | Mar 9, 1993 |
| Priority date | — |
| Expiry date | Feb 5, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/642
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for automatically identifying the or NTSC color TV standard comprises the following steps: providing a first demodulation signal (IC1) with the regenerated 90.degree.-phased sub-carrier; providing a second demodulation signal at the reference frequency of one of the colors (FOR) of the SECAM standard; providing a first voltage (VC1) by integrating the first demodulation signal (IC1), and providing a first associated logic criterion (C1), simultaneously applying the first signal (IC1) at the input of an inverter switched according to the rate of a non-half line-frequency phased signal (FL/2), providing a second voltage (VC2) by integrating the output signal (ICC) of the inverter (31), and providing a second associated logic criterion (C2); similarly providing, but from the second demodulation signal (IC2), the first logic criterion (C1) and the second logic criterion (C2); and identifying the standard received as a function of the state of the first and second logic criteria (C1 and C2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.