BUS SYSTEM
First Claim
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1. A bus system for connecting a plurality of data processing units by means of a bus that consists of two signal lines, whereinanalog signals are applied on the bus that are within multiple non-overlapping frequency bands, wherein a frequency band with a mid-frequency is assigned to each data processing unit;
- each data processing unit is coupled with the bus by means of a modem unit, which comprises the following components;
an interface unit which can be connected with the data processing unit and communicates with it by means of a digital communication protocol (e.g. IEEE 802.3);
a narrowband modulation unit that converts the flow of useful data into a signal which can be transferred by means of the frequency bands;
a filter bank synthesis unit, which as a polyphase filter bank converts the data of the interface unit on the mid-frequency assigned to the data processing unit and suppresses interferences between adjacent frequency bands;
a D/A converter, which converts the signal of the filter bank synthesis unit into an analog signal;
a bus-coupling unit, in order to couple the signal of the D/A converter to be transmitted into the bus and to decouple received signals of the bus;
an A/D converter, which digitizes the received bus signals from the bus-coupling unit;
a filter bank analysis unit, which as a polyphase filter bank partitions the digitized bus signals into the individual frequency bands and feeds the data assigned to the individual frequency bands to the interface unit; and
a narrowband demodulation unit, which demodulates the data stream of the filter bank analysis unit and feeds the user data to the interface unit.
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Abstract
The invention relates to a bus system for transmitting data between data processing units (20) in a network, by means of a bus (14) that consists of two signal lines. The signals at said bus (14) are analog signals which lie within a plurality of non-overlapping frequency bands assigned to the individual data processing units (20), and these data processing units (20) use a digital communication protocol to communicate with a signal processor unit (24) that comprises a polyphase filter bank, a D/A Converter (26) and a bus-coupling unit (30) being connected downstream of said bank in order to couple the data signal into the bus (14) 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 (20), and additionally allows data to be transmitted between all network subscribers simultaneously and without restriction.
13 Citations
20 Claims
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1. A bus system for connecting a plurality of data processing units by means of a bus that consists of two signal lines, wherein
analog signals are applied on the bus that are within multiple non-overlapping frequency bands, wherein a frequency band with a mid-frequency is assigned to each data processing unit; each data processing unit is coupled with the bus by means of a modem unit, which comprises the following components; an interface unit which can be connected with the data processing unit and communicates with it by means of a digital communication protocol (e.g. IEEE 802.3); a narrowband modulation unit that converts the flow of useful data into a signal which can be transferred by means of the frequency bands; a filter bank synthesis unit, which as a polyphase filter bank converts the data of the interface unit on the mid-frequency assigned to the data processing unit and suppresses interferences between adjacent frequency bands; a D/A converter, which converts the signal of the filter bank synthesis unit into an analog signal; a bus-coupling unit, in order to couple the signal of the D/A converter to be transmitted into the bus and to decouple received signals of the bus; an A/D converter, which digitizes the received bus signals from the bus-coupling unit; a filter bank analysis unit, which as a polyphase filter bank partitions the digitized bus signals into the individual frequency bands and feeds the data assigned to the individual frequency bands to the interface unit; and a narrowband demodulation unit, which demodulates the data stream of the filter bank analysis unit and feeds the user data to the interface unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20)
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11. An aircraft comprising a bus system for connecting a plurality of data processing units by means of a bus that consists of two signal lines, wherein
analog signals are applied on the bus that are within multiple non-overlapping frequency bands, wherein a frequency band with a mid-frequency is assigned to each data processing unit; each data processing unit is coupled with the bus by means of a modem unit, which comprises the following components; an interface unit which can be connected with the data processing unit and communicates with it by means of a digital communication protocol (e.g. IEEE 802.3); a narrowband modulation unit that converts the flow of useful data into a signal which can be transferred by means of the frequency bands; a filter bank synthesis unit, which as a polyphase filter bank converts the data of the interface unit on the mid-frequency assigned to the data processing unit and suppresses interferences between adjacent frequency bands; a D/A converter, which converts the signal of the filter bank synthesis unit into an analog signal; a bus-coupling unit, in order to couple the signal of the D/A converter to be transmitted into the bus and to decouple received signals of the bus; an A/D converter, which digitizes the received bus signals from the bus-coupling unit; a filter bank analysis unit, which as a polyphase filter bank partitions the digitized bus signals into the individual frequency bands and feeds the data assigned to the individual frequency bands to the interface unit; and a narrowband demodulation unit, which demodulates the data stream of the filter bank analysis unit and feeds the user data to the interface unit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
Specification
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Current AssigneeAirbus Defence and Space GmbH
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Original AssigneeEADS Deutschland GmbH (Airbus SE)
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InventorsHeller, Christoph, Schalk, Josef
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current710/306
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CPC 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 ...
