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:
Aug. 04, 1992
Filed:
Apr. 12, 1991
U.S. Philips Corporation, New York, NY (US);
Abstract
A circuit arrangement for identifying the transmission standard of a color television signal, having a chrominance subcarrier upon which chrominance information is modulated and color synchronising pulses, includes circuitry (14, 21, 24, 25) for determining the frequency of the chrominance subcarrier which, in those cases in which a given standard of the color television signal can unambiguously be concluded from the determined chrominance subcarrier frequency of the color television signal to be decoded, the decoder is immediately switched to the decoding of this signal of this standard, and in addition includes circuitry (23, 22) which determine the vertical deflection frequency of the television signal and ascertain whether the chrominance subcarrier has a line-sequentially alternating phase, and that in those cases in which the determined chrominance subcarrier frequency cannot unambiguously be assigned to a given standard, these information components are also used for identifying the standard of the color television signal to be decoded and for adjusting the decoder to this standard, in addition to the chrominance subcarrier frequency.