Patent ID: 8675628

Claim:
A demultiplexing apparatus including, when n (n is a natural number) represents a stage of a plurality of stages of cascade connection, in each of the stages, 2 n frequency converting low-pass filter units that apply frequency conversion to a processing target signal, remove a high-frequency component of a signal after the frequency conversion using low-pass filters having predetermined frequency characteristics, and down-sample and output a signal after the high-frequency component removal, the demultiplexing apparatus setting, in each of frequency converting low-pass filter units in a first stage, an input signal including a plurality of band signals, bands of which do not overlap, as the processing target signal, setting, in each of frequency converting low-pass filter units in a second and further stages, an output result of a frequency converting low-pass filter unit in a pre-stage as the processing target signal, and extracting the band signals based on output signals of the frequency converting low-pass filter units to thereby demultiplex the input signal, the demultiplexing apparatus comprising a reception-filter-bank control unit that calculates, based on channel information as known information including the bands and frequency arrangement of the band signals, a dividing position on a frequency axis for the processing target signal and a frequency offset value indicating a frequency conversion amount for divided signals divided in the dividing position and instructing, for each of the divided signals, a frequency converting low-pass filter unit, which sets the divided signal as a target of an output, about the frequency offset value, wherein the frequency converting low-pass filter unit carries out the frequency conversion based on the frequency offset value.