DIGITAL SIGNAL DEMULTIPLEXING DEVICE AND MULTIPLEXING DEVICE

摘要

Disclosed is a digital signal demultiplexing device for multi/demultiplexing reception signals which have been frequency-multiplexed and outputting the signals. The digital signal demultiplexing device includes: demultiplexing filter bank means formed by connecting in multiple stages, unit demultiplexing filter banks, each having at least one filter for filtering an input signal and a down sampler for down-sampling an output signal of each filter and outputting the signal; and frequency conversion/decimeter means for inputting the reception signal and at least one of the output signals of the unit demultiplexing filter banks. The frequency conversion/decimeter means includes: frequency conversion means provided for each of input signals for shifting frequency of an input signal when outputting it; and a decimeter connected in series to one or more outputs of the frequency conversion means. The decimeter means has a filter for performing band limit of the input signal and a down sampler for down-sampling the output signal of the filter when outputting the signal.