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:
Jan. 22, 1980
Filed:
Oct. 16, 1978
Heinz Hess, Weiterstadt, DE;
Michael Hausdorfer, Darmstadt, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
Each one of plural SECAM color-T.V. signals to be mixed is processed as follows: the signal is split into a luminance component and a video-frequency color component; the color component is amplitude-modulated onto a carrier, and the thusly modulated carrier is superimposed onto the respective luminance component to yield a frequency-multiplex signal which is then applied to one respective input channel of a mixer. The output signal of the mixer is split into a mixed luminance component and an amplitude-modulated mixed color component. The latter must be amplitude-demodulated, and then is frequency-modulated and superimposed onto the mixed luminance component to yield the desired mixed SECAM color-T.V. signal. Suppressed carrier amplitude-modulation is used, and each original video-frequency color component has superimposed, during the horizontal blanking intervals, reference oscillations from the carrier used for amplitude-modulation. The carrier signal needed by the amplitude-demodulator is derived from or furnished in dependence upon the amplitude of the reference oscillations in the horizontal blanking intervals of the amplitude-demodulated mixed color component, the reference oscillations having a phase which differs by 90.degree. from the phase which the carrier signal used for amplitude-modulation has outside the horizontal blanking intervals.