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:
Mar. 02, 1982
Filed:
Nov. 10, 1980
Stan Bart, Hoffman Estates, IL (US);
Gopal K Srivastava, Buffalo Grove, IL (US);
Zenith Radio Corporation, Glenview, IL (US);
Abstract
A pulse width modulator is described for width-modulating horizontal rate pulses developed in a television receiver and for applying the width-modulated pulses to the receiver's horizontal drive system. In the illustrated embodiment, the modulator includes a differential amplifier which senses the receiver's high voltage and beam current to develop a control signal which varies in accordance with variations in the beam current and the high voltage. A second differential amplifier receives the control signal and horizontal rate pulses for developing pulses whose width is varied in response to variations in the control signal. The width-modulated pulses cause the horizontal drive system to generate a substantially constant horizontal picture size despite variations in line voltage and brightness.