Demultiplexing apparatus, multiplexing apparatus, and relay apparatus

A demultiplexing apparatus comprising:

• a demultiplexed-signal selecting and distributing unit configured to output one or more input signals to one or more output destinations designated by a predetermined control signal;
• a reception low-pass filter group including frequency converting and reception low-pass filter units configured to apply frequency conversion processing and down-sampling processing to an output signal of the demultiplexed-signal selecting and distributing unit, the frequency converting and reception low-pass filter units being arranged in a tree shape, and at least a part of the frequency converting and reception low-pass filter units dividing the output signal into two and inputting the divided output signals to two frequency converting and reception low-pass filter units at a next stage;
• and
• a selector unit configured to switch, based on the control signal, an input source of a signal input to the frequency conversion and reception low-pass filter unit to any one of the demultiplexed-signal selecting and distributing unit and a frequency converting and reception low-pass filter unit at a preceding stage of the frequency converting and reception low-pass filter unit.

A multiplexing apparatus comprising:

• a transmission low-pass filter group including transmission low-pass filter and frequency converting units configured to apply up-sampling processing and frequency conversion processing to input signals and output the input signals, the transmission low-pass filter and frequency converting units being arranged in a tournament shape, and at least a part of the transmission low-pass filter and frequency converting units inputting, to the transmission low-pass filter and frequency converting units at a next stage, a signal obtained by combining, for each pair of adjacent bands, two output signals and subjecting the output signals to addition processing;
• an adding unit configured to subject signals output from a pair of the transmission low-pass filter and frequency converting units, bands of which are adjacent to each other, to addition processing;
• and
• a multiplexed-signal selecting and distributing unit configured to output, to one or more output destinations designated by a predetermined control signal, signals output from the transmission low-pass filter and frequency converting units.