Patent ID: 8446943

Claim:
A method comprising: generating a first PWM waveform signal, wherein a duty cycle of the first PWM waveform signal is proportional to an amplitude of a first signal; generating a first sinusoidal waveform signal having a first frequency; modulating the first sinusoidal waveform signal in relation to the first PWM waveform signal; transmitting the modulated first sinusoidal waveform signal to a circuit via a power conductor that couples a power source to the circuit; the circuit generating a demodulated signal by demodulating the modulated first sinusoidal waveform signal; generating a second PWM waveform signal, wherein a duty cycle of the second PWM waveform signal is proportional to an amplitude of a second signal; generating a second sinusoidal waveform signal at a second frequency; modulating the second sinusoidal waveform signal in relation to the second PWM waveform signal; transmitting the modulated second sinusoidal waveform signal to the circuit and to a second circuit via the power conductor that couples the power source to the second circuit; the second circuit generating a second demodulated signal by demodulating the modulated second sinusoidal waveform signal.