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:
Dec. 09, 2003
Filed:
Mar. 11, 2002
Stefan Gierl, Karlsruhe, DE;
Christoph Benz, Ohlsbach, DE;
Harman/Becker Automotive Systems (Becker Division) GmbH, Karlsbad, DE;
Abstract
To demodulate the RDS signal, the stereo-multiplex signal is multiplied in a first branch by the in-phase component of an oscillator filtered by a low-pass filter while decimated in its sampling rate and filtered by a high-pass filter while in a second branch it is multiplied by the quadrature component of the oscillator filtered by a low-pass filter decimated in its sampling rate, and filtered by a high-pass filter. An error signal to control the oscillator is calculated from the high-pass-filtered signals and the RDS bit clock. A clock generator generating the RDS bit clock is controlled by the first high-pass-filtered signal and by the oscillator. An RDS decoder, to whose input the first high-pass-filtered signal is applied. and an arithmetic unit which calculates the error signal from the high-pass-filtered signals and from the PDS bit clock are both clocked by the clock generator. The RDS data are retrievable from the output of the RDS decoder.