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. 01, 1977
Filed:
Jul. 25, 1975
Helmut Liman, Klein Escherde uber Hildesheim, DT;
Blaupunkt-Werke GmbH, Hildesheim, DT;
Abstract
After a preliminary differentiation, the demodulated signal is supplied in parallel to a peak rectifier and to a second differentiating network, the outputs of the latter two circuits being added in the input circuit of a switching transistor that controls the blanking gate of a receiver. The value of the resistor across the output capacitor of the peak rectifier, as well as the rectifier capacitor, is so chosen in value that periodically recurrent pulses that may be persistently present in the signal build up a blocking bias on the switching transistor reducing its sensitivity and preventing corresponding differentiated pulses from switching it on, whereas occasionally or irregularly appearing pulses develop a negligible bias through the rectifier, so that their twice differentiated derived pulses will switch on the transistor and produce blanking.