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:
Jul. 10, 2001
Filed:
Jul. 14, 1998
Paul W. Dent, Pittsboro, NC (US);
John J. Hayes, Jr., Wake Forest, NC (US);
Ericsson Inc., Research Triangle Park, NC (US);
Abstract
A method has the steps of generating a first control message having a plurality of message symbols and a first audio message to be transmitted from a first radio-communications device to a second radio-communications device. The first audio message is sampled to obtain a first plurality of audio samples, each with an instantaneous signal valve, and a first radio frequency signal which varies in frequency from a first predetermined radio frequency dependent on the instantaneous signal valves of the first plurality of samples is generated. The first radio frequency signal is formatted into a first pulsed radio frequency signal, each pulse having a time duration representative of one of the plurality of message symbols of the first control message, which is transmitted from the first radio-communication device to the second radio-communication device. A system is also provide wherein first and second radio-communication devices each include a radio frequency antenna, a frequency modulator to generate a first radio frequency signal which varies from a first predetermined radio frequency dependent on the instantaneous signal values of an audio signal provided thereto, and a first switch coupled to the antenna and the modulator to selectively couple the antenna to the modulator for a first predetermined duration, the duration of the coupling of the antenna to the modulator representative of a symbol of a control message to be communicated between the first and second radio-communication devices.