Patent ID: 9679291
Date: 2017-06-13
CPC Classifications: G06Q

Claim:
1. A method, performed by a device, for converting digital data to an analog signal, the method comprising: modulating amplitude or frequency of the analog signal in a manner that includes representing digital bits of the digital data as combinations of periodic waveforms of low, medium and high levels of amplitude in the analog signal, if modulating the amplitude of the analog signal, or representing digital bits of the digital data as combinations of periodic waveforms of low, medium and high levels of frequencies in the analog signal, if modulating the frequency of the analog signal, wherein “1” is represented by a change in the amplitude or frequency levels to a higher amplitude relative to a previous waveform in the combinations of periodic waveforms, and wherein “0” is represented by a change in the amplitude or frequency levels to a lower amplitude relative to a previous waveform in the combinations of periodic waveforms.