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:
Feb. 16, 1982
Filed:
Aug. 28, 1980
James H Wharton, Indianapolis, IN (US);
RCA Corporation, New York, NY (US);
Abstract
The luminance component of a video signal subject to overshoot is preemphasized and clipped prior to application as a modulating signal to a frequency modulator. Overshoot of the luminance signal, which tends to cause clipping distortion of the modulating signal is minimized by generating a compensating signal representative of the horizontal detail component of the luminance signal. The luminance signal is delayed relative to the compensating signal and subtractively combined therewith prior to application to the clipping circuitry such that the resultant modulating signal exhibits preshoot and reduced overshoot thereby minimizing the clipping distortion. Compensation is effectively disabled for luminance signal overshoots below the clipping level by means of an adjustable coring circuit in the compensating signal path whereby luminance signals exhibiting overshoot below the clipping level are not distorted by the compensating signal.