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:
Apr. 11, 1978
Filed:
Mar. 23, 1977
Felix Aschwanden, Thalwil, CH;
Theodor Ernst Bart, Zurich, CH;
RCA Corporation, New York, NY (US);
Abstract
A reference signal generator is provided for generating the two subcarrier reference frequencies for the SECAM television system. A master oscillator generates the first subcarrier reference frequency which is coupled to a divider for obtaining the horizontal line rate. The horizontal line rate is multiplied and coupled to a mixer, where it is mixed with the first subcarrier to obtain sum and difference frequencies. A crystal filter coupled to the mixer extracts the second subcarrier, which is locked in frequency and phase relationship to the first subcarrier. The signal generator also contains provisions for synchronizing the subcarriers to an external horizontal system reference.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile