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. 20, 1979
Filed:
Aug. 22, 1977
Heinz Hess, Weiterstadt, DE;
Horst Peth, Alsbach, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
This invention concerns a circuit arrangement for visually representing a horizontal frequency coupled input signal on the picture screen of a video display device such as a domestic television receiver. This is achieved by comparing the input signal to be represented in visual form with a vertical frequency sawtooth signal, the comparison being effected in such manner that a further signal is produced which identifies the moments when the two compared signals are equal. The further signal is then used directly or indirectly to control the brightness of the picture screen of the video display device. The further signal may be a pulse form signal with the leading flanks of the pulses corresponding to moments when the input signal crosses the sawtooth signal upwardly and the trailing flanks corresponding to the moments when the input signal crosses the sawtooth signal downwardly. The further signal is preferably differentiated prior to application to the display device.