Patent ID: 7292835

Claim:
A cable modem for down-converting an electromagnetic signal having complex modulations, comprising: an oscillator to generate an in-phase oscillating signal; a phase shifter to receive said in-phase oscillating signal and to create a quadrature-phase oscillating signal; a first frequency down-conversion module to receive the electromagnetic signal and said in-phase oscillating signal; a second frequency down-conversion module to receive the electromagnetic signal and said quadrature-phase oscillating signal; wherein said first frequency down-conversion module further comprises a first frequency translation module and a first storage module, wherein said first frequency translation module samples the electromagnetic signal at a rate that is a function of said in-phase oscillating signal, thereby creating a first sampled signal; and said second frequency down-conversion module further comprises a second frequency translation module and a second storage module, wherein said second frequency translation module samples the electromagnetic signal at a rate that is a function of said quadrature-phase oscillating signal, thereby creating a second sampled signal.