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. 06, 1995
Filed:
Oct. 28, 1993
Joannes M Sevenhans, Brasschaat, BE;
Daniel Sallaerts, Aarschot, BE;
Arnoul O Vanwelsenaers, Schilde, BE;
Jacques Wenin, Louvain-la-Neuve, BE;
Alcatel N.V., Amsterdam, NL;
Abstract
The direct conversion receiver DCR receives analog modulating signals with a reference average value and modulated within assigned time slots of a TDMA-structure on a carrier with a carrier frequency FC which changes from time slot to time slot. DCR includes a demodulator circuit DC-coupled to a baseband circuit, the demodulator circuit including a local oscillator LO and a mixer MIX and the baseband circuit including an offset correction circuit OCC/OCC' for updating different variable parameter offset correction values for different FC stored in a memory MEM and compensating offset introduced in DCR. OCC/OCC' determines, upon occurrence of an assigned time slot, an updated offset correction value as a function of an old offset correction value in a corresponding storage location of MEM and the difference between an average value of the analog signal and the reference average value, and thereupon stores the result in the corresponding storage place.