Patent ID: 7551669

Claim:
A method for communicating data in a waveform comprising: encoding a waveform comprising a first piece of information represented with a duty cycle of the waveform and a second piece of information represented with a frequency of the same waveform, where an identifier is represented with one of the first piece of information or the second piece of information, and data is represented with an other of the first piece of information or the second piece of information: transmitting the waveform, a first scaling value, and a second scaling value over a network to a plurality of receivers; receiving the waveform, the first scaling value, and the second scaling value; decoding one of the duty cycle or the frequency of the received waveform with the first scaling value to determine the identifier from the first piece of information or the second piece of information, respectively; and the receivers identified by the determined identifier decoding another of the duty cycle or the frequency of the received waveform with the second scaling value to determine the data from the first piece of information or the second piece of information, respectively.