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. 09, 1985
Filed:
Sep. 10, 1982
Jurgen Ruprecht, Norderstedt, DE;
Wolfgang Weltersbach, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
By means of a digital filter, the chrominance signal is separated from the digitized picture signal and is applied to a variable-gain amplifier which is formed by the series arrangement of a shift stage and a multiplier. The two stages are controlled by a control circuit which receives the maximum amplitude value of the color synchronizing signal, obtained in a digital manner. Depending on this amplitude value the position of the chrominance signal is shifted and thereafter multiplied in the multiplier by a factor of, for example, between 0.5 and 1. Acting thus, the gain factor is split into two sub-factors, one of which is an integral power of 2 and in this way the multiplier is utilized in a much more advantageous manner. The amplitude value of the color synchronizing signal is measured before the amplifier, so that the control is a forward control, none of the problems occurring with closed control loops now being present.