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:
Jul. 12, 1983
Filed:
Apr. 15, 1981
Klaus Lehmann, Muhltal, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A diode, of which the nonlinear characteristic is utilized for correcting the gradation characteristic of a video signal, has one of its electrodes connected to the output of the correction circuit, and has a voltage applied to its other electrode which is derived from the output voltage by inversion, amplification and integration during the blanking interval. Thus, in every blanking interval, the steady potential terminal of the diode is clamped to the desired black picture level for automatically holding constant the working region of the diode. An operational transconductance amplifier charges a capacitor, the voltage of which is applied to the diode through an impedance converter.