Patent ID: 6844787

Claim:
An apparatus, comprising: a reference oscillator configured to generate a reference oscillator signal at a first frequency; a first frequency changing device configured to generate a first version of a periodic signal at a second frequency based on the reference oscillator signal; an input signal having a first spectral content; a first modulator coupled to receive the first version of the periodic signal and the input signal, wherein the modulator is configured to produce a first modulated signal; a signal assembler configured to assemble the reference oscillator signal and the first modulated signal; a transmission medium configured to carry the assembled first modulated and reference oscillator signals; a signal disassembler receiving from the transmission medium the assembled reference oscillator and first modulated signals, the signal disassembler providing a representation of the reference oscillator signal; a second frequency changing device configured to generate a second version of the periodic signal at the second frequency based on the representation of the reference oscillator signal; a demodulator coupled to the signal disassembler, wherein the demodulator is configured to demodulate the first modulated signal using the second version of the periodic signal to produce an approximation of the input signal.