Patent ID: 6259731
Filing Date: 2001-07-10
Classification: H04M

Abstract:
A method of communicating control and audio information between at least two radio-communication devices, the method comprising the steps of:generating a first control message comprising a plurality of message symbols to be transmitted from a first radio-communications device to a second radio-communications device;generating a first audio message to be transmitted from the first radio-communications device to the second radio-communications device;sampling the first audio message to obtain a first plurality of audio samples, each with an instantaneous signal value;generating a first radio frequency signal which varies in frequency from a first predetermined radio frequency dependent on the instantaneous signal values of the first plurality of samples;formatting the first radio frequency signal 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; andtransmitting the first pulsed radio frequency signal from the first radio-communication device to the second radio-communication device.