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:
Jun. 01, 1976
Filed:
Jun. 30, 1975
Jens Hansen, Hildesheim, DT;
Blaupunkt-Werke GmbH, Hildesheim, DT;
Abstract
Two disturbance recognition circuits are supplied in parallel with the output of the receiver demodulator, one of them having a threshold characteristic with a sensitivity maximum only slightly above the frequency band of the received signal and a steep sensitivity frequency characteristic between that maximum and the upper edge of the signal band, while the other recognition circuit has its sensitivity well above the main sensitivity range of the first-mentioned recognition circuit. An AND-circuit is provided at the ouputs of the recognition circuits so that a blanking pulse will be produced only when both recognition circuits respond. The output pulse of the recognition circuit with the higher frequency sensitivity is broadened so that it will persist in the AND-circuit long enough to allow for the slower response time of the other recognition circuit. Blanking is disabled by a parallel switch when the rate of operation of the AND-circuit reaches a rate at which audible effects would be produced anyway.