Patent ID: 7277501

Claim:
A data receiving device which is supplied with an in-phase signal and a quadrature signal that are obtained by quadrature detecting a frequency-converted phase-modulated signal, and outputs a detection signal, the data receiving device comprising: a first sampler for sampling the in-phase signal at every predetermined sampling period and outputting the sampled in-phase signal; a second sampler for sampling the quadrature signal at every said predetermined sampling period and outputting the sampled quadrature signal; a partial band extracting section structured by a complex filter for extracting at least one partial band, whose center frequency is not 0, from frequency components included in the sampled in-phase signal output from the first sampler and the sampled quadrature signal output from the second sampler, separating a signal of the extracted partial band into an in-phase component and a quadrature component, and outputting the in-phase component and the quadrature component as a partial band signal; and a detecting section for receiving the partial band signal, whose center frequency is not 0, output from the partial band extracting section, and for outputting the detection signal, wherein the detecting section does not perform frequency conversion on the received partial band signal.