Patent ID: 8731123

Claim:
A demultiplexing device that demultiplexes a reception signal into 2 N waves (N is a natural number equal to or larger than one), the demultiplexing device comprising: a reception low-pass-filter group including 2 N+1 −2 frequency-converting and reception low-pass-filter units that each perform a frequency converting process and a low-pass filtering process for the reception signal to cause the reception signal to pass through a desired band, further perform downsampling to reduce a sampling rate to half of a data rate of an input signal, and output a processed signal, having the frequency-converting and reception low-pass-filter units arranged in a tree with an N-stage configuration, dividing an output signal from each of frequency-converting and reception low-pass-filter units arranged at an Mth stage (1≦M≦N) into two, and inputting the divided signals to two different frequency-converting and reception low-pass-filter units at a subsequent stage, respectively; and a reception channel-filter group including 2 N reception channel-filter units that waveform-shape the signals from the frequency-converting and reception low-pass-filter units according to a desired frequency characteristic to output the waveform-shaped signals and are arranged to connect to 2 N frequency-converting and reception low-pass-filter units at an Nth stage in a one-to-one relation.