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. 03, 1979
Filed:
Aug. 08, 1977
Peter Bragas, Hildesheim-Itzum, DE;
Blaupunkt-Werke GmbH, Hildesheim, DE;
Abstract
A video disk recording made in accordance with U.S. television standards, namely a line scanning frequency of 15,734 HZ and a field scanning frequency of 30 HZ is played back through a pick-up feeding a television receiver operating at the European standard line scanning frequency of 15,625 HZ provided with a switch that has changed over the vertical scanning frequency to the 30 HZ U.S. standard field scanning frequency. In order for the playback system to work with the European line scanning frequency, the record drive is timed to operate at the proportionately low speed and the speed is held to the timing pulses produced by an oscillator by feeding back the picked up synchronizing signals and comparing them with the oscillator timing pulses in a phase detector that controls the speed adjustment of the playback motor.