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. 15, 1980
Filed:
May. 22, 1978
Richard C Palmer, Blawenburg, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A recording signal containing a main carrier modulated in accordance with picture signal information inclusive of synchronizing components, and an auxiliary carrier modulated in accordance with sound signal information and a pilot signal, is impressed on a video disc record along a spiral track on the surface thereof. The frequencies of the synchronizing components and the pilot signal are such that an integral number of synchronizing components and a non-integral number of pilot signal cycles occupy each convolution of the spiral track. The playback apparatus includes circuitry coupled to the output of a player stylus for recovering the pilot signal, and further includes circuitry responsive to the deviations in the phase of the recovered pilot signal for developing an error signal indicative of the magnitude and sense of a disruption in the regular progression of the stylus along the spiral track due to a sudden shift in the radial location of the stylus. A suitable track skipper mechanism is activated in response to the error signal to radially shift the stylus in a manner that offsets the disruption in the regular progression thereof.