Bus system using plurality of non-overlapping frequency bands for communication
First Claim
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1. A bus system associated with a network partitioned into multiple virtual connections, the bus system comprising:
- a bus having two signal lines with analog signals applied on the bus within non-overlapping frequency bands;
a plurality of data processing units, each of the data processing units assigned with a distinct non-overlapping mid-frequency band, the bus connecting the data processing units to the network using direct point-to-point or point-to-multipoint virtual connections based at least on one distinct non-overlapping mid-frequency band; and
a modem unit coupling each data processing unit with the bus using the two signal lines of the bus, the modem unit comprising;
an interface unit connectable with each data processing unit to communicate using the direct point-to-point or point-to-multipoint virtual connections with each data processing unit using a digital communication protocol;
a modulation unit that converts flow of data into a signal that is transferable using the non-overlapping frequency bands;
a filter bank synthesis unit comprising a polyphase filter bank that converts the data of the interface unit on the distinct mid-frequency band assigned to the data processing unit and suppresses interferences between adjacent non-overlapping frequency bands;
a D/A converter that converts the signal of the filter bank synthesis unit into an analog signal;
a bus-coupling unit configured to inductively or capacitively couple the analog signal of the D/A converter that is transmitted onto the bus in a galvanically isolated manner, and to inductively or capacitively decouple one or more analog signals received from the bus in a galvanically isolated manner;
an A/D converter that digitizes the analog signals received from the bus-coupling unit;
a filter bank analysis unit comprising a polyphase filter bank that partitions the digitized signals into the distinct non-overlapping frequency bands, and feeds data to the interface unit based on its assigned non-overlapping frequency band; and
a demodulation unit that demodulates the data of the filter bank analysis unit, and feeds user data to the interface unit, wherein the bus system transmits data using the direct point-to-point or point-to-multipoint virtual connections while minimizing interference between the multiple virtual connections, wherein only every second frequency band of the non-overlapping frequency bands is utilized exclusively.
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Abstract
The invention relates to a bus system for transmitting data between data processing units in a network, by means of a bus that consists of two signal lines. The signals at said bus are analog signals which lie within a plurality of non-overlapping frequency bands assigned to the individual data processing units, and these data processing units use a digital communication protocol to communicate with a signal processor unit that comprises a polyphase filter bank, a D/A Converter and a bus-coupling unit being connected downstream of said bank in order to couple the data signal into the bus in a galvanically-isolated manner. The proposed bus system has a simple design with regard to cabling, allows the use of a Standard communication protocol such as Ethernet for the data processing units, and additionally allows data to be transmitted between all network subscribers simultaneously and without restriction.
18 Citations
16 Claims
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1. A bus system associated with a network partitioned into multiple virtual connections, the bus system comprising:
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a bus having two signal lines with analog signals applied on the bus within non-overlapping frequency bands; a plurality of data processing units, each of the data processing units assigned with a distinct non-overlapping mid-frequency band, the bus connecting the data processing units to the network using direct point-to-point or point-to-multipoint virtual connections based at least on one distinct non-overlapping mid-frequency band; and a modem unit coupling each data processing unit with the bus using the two signal lines of the bus, the modem unit comprising; an interface unit connectable with each data processing unit to communicate using the direct point-to-point or point-to-multipoint virtual connections with each data processing unit using a digital communication protocol; a modulation unit that converts flow of data into a signal that is transferable using the non-overlapping frequency bands; a filter bank synthesis unit comprising a polyphase filter bank that converts the data of the interface unit on the distinct mid-frequency band assigned to the data processing unit and suppresses interferences between adjacent non-overlapping frequency bands; a D/A converter that converts the signal of the filter bank synthesis unit into an analog signal; a bus-coupling unit configured to inductively or capacitively couple the analog signal of the D/A converter that is transmitted onto the bus in a galvanically isolated manner, and to inductively or capacitively decouple one or more analog signals received from the bus in a galvanically isolated manner; an A/D converter that digitizes the analog signals received from the bus-coupling unit; a filter bank analysis unit comprising a polyphase filter bank that partitions the digitized signals into the distinct non-overlapping frequency bands, and feeds data to the interface unit based on its assigned non-overlapping frequency band; and a demodulation unit that demodulates the data of the filter bank analysis unit, and feeds user data to the interface unit, wherein the bus system transmits data using the direct point-to-point or point-to-multipoint virtual connections while minimizing interference between the multiple virtual connections, wherein only every second frequency band of the non-overlapping frequency bands is utilized exclusively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An aircraft comprising a bus system associated with a network partitioned into multiple virtual connections, the bus system comprising:
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a bus having two signal lines with analog signals applied on the bus within non-overlapping frequency bands; a plurality of data processing units, each of the data processing units assigned with a distinct non-overlapping mid-frequency band, the bus connecting the data processing units to the network using direct point-to-point or point-to-multipoint virtual connections based at least on one distinct non-overlapping mid-frequency band; and a modem unit coupling each data processing unit with the bus using the two signal lines of the bus, the modem unit comprising; an interface unit connectable with each data processing unit to communicate using the direct point-to-point or point-to-multipoint virtual connections with each data processing unit using a digital communication protocol; a modulation unit that converts flow of data into a signal that is transferable using the non-overlapping frequency bands; a filter bank synthesis unit comprising a polyphase filter bank that converts the data of the interface unit on the distinct mid-frequency band assigned to the data processing unit and suppresses interferences between adjacent non-overlapping frequency bands; a D/A converter that converts the signal of the filter bank synthesis unit into an analog signal; a bus-coupling unit configured to inductively or capacitively couple the analog signal of the D/A converter that is transmitted onto the bus in a galvanically isolated manner, and to inductively or capacitively decouple one or more analog signals received from the bus in a galvanically isolated manner; an A/D converter that digitizes the analog signals from the bus-coupling unit; a filter bank analysis unit comprising a polyphase filter bank that partitions the digitized signals into the distinct non-overlapping frequency bands, and feeds data to the interface unit based on its assigned non-overlapping frequency band; and a demodulation unit that demodulates the data of the filter bank analysis unit, and feeds user data to the interface unit, wherein the bus system transmits data using the direct point-to-point or point-to-multipoint virtual connections while minimizing interference between the multiple virtual connections, wherein only every second frequency band of the non-overlapping frequency bands is utilized exclusively. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification
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Current AssigneeAirbus Defence and Space GmbH
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Original AssigneeAirbus Defence and Space GmbH
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InventorsHeller, Christoph, Schalk, Josef
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Primary Examiner(s)Zaman, Faisal M
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Application NumberUS14/346,494Publication NumberTime in Patent Office1,945 DaysField of Search710306, 370485US Class CurrentCPC Class CodesG06F 13/4004 Coupling between busesG06F 13/4068 Electrical couplingH04J 1/12 Arrangements for reducing c...H04L 12/40032 Details regarding a bus int...H04L 2012/40215 Controller Area Network CANH04L 2012/4028 the transportation system b...H04L 25/0266 Arrangements for providing ...
