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:
Oct. 27, 1998
Filed:
Dec. 11, 1995
Terrance Ralph Beale, Kokomo, IN (US);
Delco Electronics Corporation, Kokomo, IN (US);
Abstract
A frequency synchronization network is disclosed that is particularly suited for a Eureka-147 system transmitting synchronization symbols and multiple data carriers, wherein the multiple carriers are transmitted simultaneously and separated from each other by a bin quantity. The network comprises a Fast Fourier transform (FFT) network, a complex rotation device, and a power analyzer. The power analyzer determines the peak condition of the FFT bin quantities and routes this information to an interpolation sequence that determines the zero-crossover condition of the peak bin quantity, and which ultimately determines an output as the frequency offset of the AFC frequency symbol. The frequency offset quantity is provided to an automatic frequency control (AFC) network to provide for frequency locking of the transmitting and receiving elements of the Eureka-147 system.