Patent ID: 7310385

Claim:
A method for generating a waveform containing encoded digital data having one of a first value and a second value at selected phase angles θ n comprising: generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of data regions, the first function being Y=sin θ; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the data regions having a range of Δθ beginning at each phase angle θ n where data of the first value is to be encoded; generating the waveform having an amplitude Y defined by a second function at phase angles lying inside the data regions having a range of Δθ associated with each phase angle θ n where data of the second value is to be encoded, the second function being different from Y=sin θ; and generating the third harmonic of the waveform containing encoded digital data.