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:
Jun. 02, 1981
Filed:
Jun. 05, 1979
Michel Van Den Driessche, Paris, FR;
Thomson-CSF, Paris, FR;
Abstract
The invention relates to a circuit for decoding chrominance signals from the composite videofrequency signal in the Secam color television system. In order to direct each chrominance signal to the corresponding channel, it is proposed in accordance with the invention to extract the demodulated signals at the beginning of each line and to treat them in the first place by a controlled circuit which equalizes their d.c. voltages, in the second place by a color identification circuit which synchronizes the commutator with the television transmitter and in the third place by a 'keeper' circuit for identifying the Secam process which inhibits the chrominance circuit if the transmission is by another process or parasitized. Application to television receivers using the Secam system.