The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1993
Filed:
Feb. 05, 1991
Michel Imbert, Seyssins, FR;
Frederic Lambert, Grenoble, FR;
SGS-Thomson Microelectronics S.A., Gentilly, FR;
Abstract
A method for automatically identifying the PAL 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).