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:
May. 14, 1991
Filed:
Apr. 13, 1990
Raymond Strauch, Viroflay, FR;
U.S. Philips Corporation, New York, NY (US);
Abstract
The device comprises, in a control loop of the subtractive beat frequency fb between transmitted waves and waves received as an echo, a pursuit discriminator (11) establishing the frequency fb at f.sub.0 and a pursuit validation circuit (12). This device is characterized by the combination of a contrast discrimination set (CDS (15 to 18) and a VSE discrimination set (21 to 25) for detecting energy in a guard band situated at the upper end of the frequency bands of the CDS, the latter comprising a contrast discriminator (15), a first attenuator (16) and controlling the pursuit validation circuit (12). The VSE discrimination set is arranged for controlling the gain of the first attenuator (16).