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:
Aug. 21, 2007
Filed:
Mar. 18, 2004
Terry C. Helstrom, Boynton Beach, FL (US);
Anh Nguyen, Boynton Beach, FL (US);
Terry C. Helstrom, Boynton Beach, FL (US);
Anh Nguyen, Boynton Beach, FL (US);
XM Satellite Radio, Inc., Washington, DC (US);
Abstract
A digital audio system () can include a receiver () coupled to an RF modulator (), a source signal modulated by the RF modulator to provide a modulated signal, and an external antenna () for receiving the source signal and for transmitting the modulated signal. The receiver can be a satellite radio receiver or any digital source such as an FM radio or MPplayer for example. The system can further include a coupling network () coupled between the receiver and the external antenna and between the RF modulator and the external antenna. The system can further include an internal antenna () coupled to the RF modulator for radiating the modulated signal via a second path. The digital audio system can be a satellite digital audio radio system for a vehiclewith the external antenna placed outside the vehicle and the internal antenna placed inside the vehicle.