DE2152363A1 - Transmitter for signaling devices for the transmission of digitally coded information - Google Patents

Description

British Railways Board, 222, Marylebone Road,
London NV /. 1 / England

Transmitter for signaling devices for the transmission of
digitally encoded information

The invention relates to a transmitter or transmitter for use in signaling devices with which information be transmitted in digital code.

The invention is particularly, but not exclusively, applicable to track-train signaling devices, son countries is also used, for example, in telemetering systems.

In the case of track-train signaling devices, a message is sent as a digital Gleistelegrarnm to control or regulate the course of the train from a track-side transmitter to a train by transmitting control signals to the train driver or locomotive driver, or by automatically activating or controlling the train's control unit or switchgear is controlled. The message bzv /. Information can be obtained from the donor
are transmitted via conductors along the track section which are inductively coupled with antenna devices in the train, the antenna devices in turn paging a decoding receiver with the information. The track telegram can, for example, be an in-

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SAD ORIGINAL

format! ons have content that is available in the facilities of the -. ■ -, ■ Train is used to achieve the maximum permissible speed for the train and to present it to the engine driver as a visual display.

Track telegrams can contain information, of which a part for the relevant section of the route, for which it 'is used is constant. This constant ■ Information can contain geographical information and contains, for example, the distance to signals, a Information on the gradient (incline) and sections of the route with speed restrictions. The remaining part of the information content of the track telegram is eii ± e changing information and relates to the Signal position in front of the train and depends on the occupation of the track by trains in front. The information content of the track telegram will therefore vary depending on the prevailing signal positions change before the move.

Currently, four signal positions or signal displays are normally provided, green, two yellows, yellow and red, although additional signal positions can still be used. So far, the meaning of color has been for the signal position used; However, it should be emphasized that, especially in the case of an automatic train control, the Signal position or signal display can be represented by electrical signals.

The invention is based on the object of creating a transmitter or transmitter in which digital encryption the information does not have to take place every time the status of a variable, such as a signal position, which determines the information content, changes. Included Track telegrams in the message transmission from track to train a digital encryption in the normal case the the Contains parity-checking bits, which are continuously included in the Gleistelegramni, will be such

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GÄD ORIGINAL

digital coding by means of the always existing correlation between the information bits and the check bits for parity avoided to identify errors.

This task is carried out by means of an encoder for use in signaling devices for the transmission of information presented in digital form of the initially mentioned Genus solved in that the encoder contains several readout memories, each of which has a stored information content which relates to the respective state of an assigned variable, and that Steu ermjttel for the relevant state of the variables are available to the output signal of one of the read-out memories which refers to the prevailing state of the variable for transmission to the encoder.

Under the designation "readout memory" is a permanent one Understand information store, i.e. a store whose information content has not changed during the query will. A known embodiment of a read-out memory has a diode matrix in which the information content is contained into the memory by inserting diode pins assigned connection points is entered, with an existing diode at a connection point, for example represents a "zero" and the absence of a diode consequently a "one" in conventional binary Code.

To better illustrate the invention, an inventor is dunking Encoder and its application in track-train signaling devices based on a Ausführungsbeispie les explained in more detail in the drawing. It shows:

1 shows a circuit of the encoder and the associated control device, and

2 shows one of the readout memories of the transmitter in more detail.

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■ The arrangement is for a section of a track described with four optical signal positions. The invention is based on the object of a line telegram to be transmitted to a train with geographical information about the route section and that with specified Information as well as information about the respective Signal position in front of the train in the time in which the line telegram is sent to inform the train of this. For example, if the line telegram contains information that informs the train about a maximum permissible speed, this information is different for each signal position.

The optical signals labeled Y-, G, Yp and R are illuminated by an alternating current source via transducers 2, 5, 4 and 5. The activation of the signal to be illuminated is controlled by means of three relays HR, HHR and DR, their feed being controlled in a manner known per se by means of a trackside message device. Contacts HR 1 of relay HR, relay contacts HHR 1 of relay HHR and contacts DR 1 and DR 2 of relay DR are arranged in the circuit part between energy source 1 and the signals. The position of these contacts is shown for the energized state of the relay. When all three relays are energized, the optical signal G is illuminated for a green signal position. When relays HR and HHR are energized and relay DR is not energized, signals Y ₁ and Y _{2 are} illuminated for a double-yellow signal position. When relay HR is energized and relays HHR and DR are not energized, signal Yp is illuminated for a yellow signal position. If the relay HR is not energized, the signal R is illuminated for a red signal position.

The transmitter or transmitter for the telegram has four readout memories ROM 1, ROM 2, ROM J and ROM 4, which have Contacts HR 2, HHR 2 and DR 3 of relays HR, HHR and DR

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are connected to a data output 6, which feed the conductor of the route section or a corresponding circuit for the section via a modulator 7, via which a communication connection with the train in the relevant route section is established. The position of the contacts HR 2, HHR 2 and DR 5 is shown for the energized state of the assigned relays. It is therefore apparent that for a green signal position the read-out memory ROM H- with the data ^ output 6, for a double yellow signal position the read-out memory ROM 3 with the output β for the data, for a yellow signal position the read-out memory ROM 2 with the Output 6 for the data and for a red signal position the read-out memory ROM 1 is connected to the output or to the output line 6 for the data. In this way, for each signal position or display, the content of one of the relevant read-out memories ROM 1 to ROM H- is fed to the output 6 and transmitted continuously and in sequence via a modulator 7 to the circuit for the track section.

Query stores and query systems for this are in themselves already known. However, there is an embodiment of a readout memory and the associated interrogation device Briefly described with reference to Fig. 2:

The read-out memory gives a sequence of 256 binary bits away. The signal pattern is determined by the position of the diode pins in a 16 × 16 matrix board 10. According to of the conventional representation chosen thus means the presence of a diode pin at a connection point the representation of a "zero" and the absence of a diode pin the representation of an "l".

The diode is electronically scanned by placing a "zero" in one of the horizontal rows

15th
while the other rows are in their "!"

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will hold. Each column is then used in turn ' · to realize,

an electronic switch, TYöb selects a diode plug is present at a junction between the row with a "zero" and the selected column. When all columns have been checked, the next row is selected and the process is repeated.

The selector switch for the columns consists of two eight-way multiplexers 11 and 12. The input of each multiplexer is connected to each row by means of an AND gate with 16 inputs, which consists of NAND gates 13 and 14 f with eight inputs and a NOR -Gate 15 exists. The column to which each multiplexer is connected is determined by the state of inputs A, B and C. Each multiplexer is designed to scan its eight inputs by polling the three inputs A, B and C cyclically by connecting buffer gates 17, 18 and 19 to the outputs of the first three stages of a four-stage counter 16 (ripple counter) . The fourth stage of the counter 16 is used to switch between the two multiplexers 11 and 12 with means of gates 22, 25, 24 and 25, and to control the selector for the lines via line 20.

* The counter 16 and consequently the multiplexers 11 and 12 change their state on the negative edges of an input 26 for the timer, which is controlled by a Schmitt trigger circuit 27 is shaped accordingly.

To select the rows, a "zero" is added through the sixteen Inputs from two binary - to eight - decoders 30 and 31 by means of a four-stage counter (ripple counter) 32 cyclically guided. Each of the outputs of decoders 30 and 51 is connected to an assigned row of the matrix 10. Buffer gates 33 to 36 are between the counter 22 and the decoders 30 and 31 switched to from the decoders to prevent generated signals from resetting the counter 32.

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The counters 16 and J2 are - as shown - provided with synchronized inputs Jß . However, this can be done optionally.

There are several other options for controlling the read-out memory so that the memory content responsible for the prevailing signal state determines the track telegram. For example, the relay contacts HR 2, HHR 2 and DR 3 can be provided in corresponding inputs of the read-out memories for the clock generator or in associated supply devices for the read-out memories.

- Expectations -

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Claims (2)

Expectations 1.) peber for use in signaling devices for the transmission of messages in digital code, characterized in that the transmitter has a plurality of readout memories, each of which has a stored informa tion content for an associated state of a variable, and control means that respond to the state of the Address variables so that the output signal of one of the read-out memories, which is assigned to the prevailing state of the variable, is transmitted by means of the transmitter or transmitter. 2.) Encoder according to claim 1, characterized in that all read-out memories are controlled simultaneously and that the control means have switching means to connect the output of one of the read-out memories for the prevailing state of the variables with the output circuit of the transmitter. J5.) Transmitter according to claim 1 or 2, for use in track-train signaling devices, characterized in that each read-out memory has a content assigned to a corresponding signal position and that the control means respond to the prevailing signal position. 2098Ί8 / 0718 Blank page