1. A demultiplexing apparatus comprising:
a signal receiving unit that receives signals;
an analog demultiplexing unit that analog-demultiplexes, in predetermined units of channels, received signals received by the signal receiving unit and generates and outputs analog demultiplexed signals; and
a plurality of digital demultiplexing units that digital-demultiplex, in units of sub-channels, the analog demultiplexed signals output from the analog demultiplexing unit and generate digital demultiplexed signals, wherein
the analog demultiplexing unit controls, concerning the analog demultiplexed signals output to the digital demultiplexing units, a total value of bandwidths in which a signal is present so as to be a predetermined value or less.
2. The demultiplexing apparatus according to claim 1, wherein the digital demultiplexing unit selects a signal in which a signal is present among the digital demultiplexed signals.
3. The demultiplexing apparatus according to claim 1, wherein
the signal receiving unit receives signals from a plurality of beam areas, and
the analog demultiplexing unit includes:
a beam selecting unit that selects signals received from one beam area out of the received signals from the beam areas; and
a synthesizer that extracts, in units of channels, a received signal of a specific channel among the received signals selected by the beam selecting unit.
4. The demultiplexing apparatus according to claim 1, wherein
the digital demultiplexing unit includes a decimation filter unit and a channel filter,
the decimation filter unit digital-demultiplexes the analog demultiplexed signals in units of sub-channels, and selects a digital demultiplexed signal in which a signal is present among the demultiplexed digital demultiplexed signals, and
the channel filter performs removal of adjacent wave components and waveform shaping with respect to the selected digital demultiplexed signal.
5. The demultiplexing apparatus according to claim 4, wherein the decimation filter unit is configured by a combination of a polyphase filter unit and an FFT unit.
6. A multiplexing apparatus comprising:
a switch matrix unit that outputs a plurality of digital demultiplexed signals demultiplexed into sub-channels;
a plurality of digital multiplexing units that receive the digital demultiplexed signals, digital-multiplex the digital demultiplexed signals in predetermined units of channels, and generate digital multiplexed signals; and
an analog multiplexing unit that analog-multiplexes the digital multiplexed signals and generates analog multiplexed signals, wherein
the switch matrix unit controls a total value of bandwidths of the digital demultiplexed signals output to the digital multiplexing units so as to be a predetermined value or less.
7. The multiplexing apparatus according to claim 6, wherein the digital multiplexing unit generates a desired channel using the digital multiplexed signals and empty data generated inside.
8. The multiplexing apparatus according to claim 6, wherein
the analog multiplexing unit includes a synthesizer unit, a beam selecting unit, and a plurality of antennas,
the synthesizer unit removes unnecessary frequency components from the received digital multiplexed signals, and
the beam selecting unit selects one antenna among a plurality of antennas to transmit the digital multiplexed signals, from which the unnecessary frequency components is removed, to a desired beam area.
9. A relay apparatus comprising:
a signal receiving unit that receives signals;
an analog demultiplexing unit that analog-demultiplexes, in predetermined units of channels, received signals received by the signal receiving unit and generates and outputs analog demultiplexed signals;
a plurality of digital demultiplexing units that digital-demultiplex the analog demultiplexed signals in units of sub-channels and generate digital demultiplexed signals:
a switch matrix unit that outputs a plurality of the demultiplexed digital demultiplexed signals;
a digital multiplexing unit that receives the digital demultiplexed signals output from the switch matrix unit, digital-multiplexes the digital demultiplexed signals in predetermined units of channels, and generates digital multiplexed signals; and
an analog multiplexing unit that analog-multiplexes the digital multiplexed signals and generates analog multiplexed signals, wherein
the analog demultiplexing unit controls, concerning the analog demultiplexed signals output to the digital demultiplexing units, a total value of bandwidths in which a signal is present so as to be a predetermined value or less.
10. A relay apparatus comprising:
a signal receiving unit that receives signals;
an analog demultiplexing unit that analog-demultiplexes, in predetermined units of channels, received signals received by the signal receiving unit and generates and outputs analog demultiplexed signals;
a plurality of digital demultiplexing units that digital-demultiplex the analog demultiplexed signals in units of sub-channels and generate digital demultiplexed signals;
a switch matrix unit that outputs a plurality of the demultiplexed digital demultiplexed signals;
a digital multiplexing unit that receives the digital demultiplexed signals output from the switch matrix unit, digital-multiplexes the digital demultiplexed signals in predetermined units of channels, and generates digital multiplexed signals; and
an analog multiplexing unit that analog-multiplexes the digital multiplexed signals and generates analog multiplexed signals, wherein
the switch matrix unit controls a total value of bandwidths of the digital demultiplexed signals output to the digital multiplexing units so as to be a predetermined value or less.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A control system for construction machine, comprising:
a pair of first and second main pumps which are variable-displacement pumps;
first and second circuit systems connected to the first and second main pumps and including a plurality of control valves;
main switching valves provided between the first and second circuit systems and the first and second main pumps;
a hydraulic motor for power generation connected to the first and second main pumps via the main switching valves;
a generator coupled to the hydraulic motor for power generation; and
a battery for storing power generated by the generator;
wherein when at least the main switching valve connected to one circuit system is at a position to cause one main pump connected thereto to communicate with the hydraulic motor for power generation, the main switching valve connected to the other circuit system causes the other main pump to communicate with the other circuit system.
2. The control system according to claim 1, wherein:
one of the main switching valves causes one of the first and second main pumps to communicate with one of the first and second circuit systems connected thereto via a throttle passage in the one main switching valve when at a position to connect the main pump to the hydraulic motor for power generation.
3. The control system according to claim 1, wherein:
one of the main switching valves connected to one of the first and second circuit systems opens a main passage for connecting one of the first and second main pumps to the one circuit system connected thereto and a joint passage for causing oil discharged from an assist pump to join the one main pump via a check valve when at a normal position, and opens the main passage and closes the joint passage when at a switch position.