Patent ID: 7705711

Claim:
An information-processing apparatus that transmits a carrier wave signal having a prescribed frequency to a signal-responding member of a back-scattering communication scheme and that receives and processes a response signal obtained by modulating the carrier wave signal based on prescribed data from the signal-responding member, the apparatus comprising: a signal-transmitting unit that transmits the carrier wave signal to the signal-responding member; and a signal-processing unit that receives and processes the response signal scattered from the signal-responding member, wherein the signal-processing unit is provided with a carrier-wave-compensating circuit, the carrier-wave-compensating circuit being adapted to obtain the response signal by: comparing a phase of the carrier wave signal in transmitting the carrier wave signal with a phase of the carrier wave signal in receiving the carrier wave signal so as to detect any carrier wave signal that is not synchronized with the phase of the carrier wave signal in transmitting the carrier wave signal; and eliminating the detected carrier wave signal from the carrier wave signal in receiving the carrier wave signal by subtracting therefrom a replica of the detected carrier wave signal.