FI57909C - COUPLING REQUIREMENT FOR ALTERNATION OF TV FREQUENCY FOR OVER OEVERAGE FOR BINAERTECK MEDELST FREQUENCY CONNECTION I FJAERR- SIGNAL- RESP FJAERRSTYRNINGSANLAEGGNINGAR SPECIELLT FOER JAERNVAEGSSAEKERHETSLALA - Google Patents

Description

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Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2317718.6 (71) Siemens Aktiengesellschaft, Berlin / Munchen, DE; Wittelsbacherplatz 2, D-8000 Munchen 2, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Gerhard Liitge, Braunschweig, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7U) Berggren Oy Ab (5U) in remote communication, or, remote control installations, in particular in railway safety equipment - Kopplingsanordning for alstring av tva frequencies for overruns with binary frequency and frequency signals, resp. for use in certain categories

The invention relates to a switching device for generating two frequencies in binary signal transmission with frequency keying in long-distance communication facilities, in particular railway safety equipment, in which information telegrams are exchanged between two devices.

Such devices are needed, for example, in rail vehicles in rail transport in order to exchange data and information between fixed instruments and trains, in order to control and optimize traffic. For this purpose, information electronic messages are prepared at regular intervals and transmitted to rail vehicles.

For this purpose, German application publication No. 1,530 33? a system for securing and controlling rail-bound vehicles, in particular for rail vehicles, in which information telegrams between the rail vehicles and the on-board fixed control center are transmitted via in-vehicle antennas inductively connected to short 2 57909 wire loops arranged along the line. The separate short conductor loops can in each case be connected to the control center via a special cable. However, it is also possible to accommodate remotely controlled switches along the line, through which the individual cable loops are connected in a program-controlled manner to a special cable.

However, the latter method is only useful when the control center has to serve a smaller area with only a few conductor loops, as only in this case is it guaranteed that the cyclically coupled conductor loops participate in the communication sufficiently often so that the time interval between two large telegrams . In a large part of the conductor loops, the devices are usually designed in such a way that all the conductor loops are continuously connected to the control center, whereby each conductor loop-Kalle has its own transmitter device for the signal frequencies.

For this purpose, a frequency-changeable LC oscillator must be provided for each conductor loop, which can be keyed in terms of its frequency from the information content to the telegrams transmitted to the trains, respectively. The cost of oscillators is then considerable. A further disadvantage is that the separate oscillators must be adjusted to the desired signal frequencies. In view of the effects of the environment in harsh railway operation, especially over a wide temperature range, the vibration characteristics must be kept constant.

The object of the invention is to avoid the use of oscillators, without limiting the possibility of simultaneous information transmission via all information channels connected to the exchange, such as conductor loops.

According to the invention, the problem is solved in such a way that in a crystal-controlled rectangular generator, two frequency dividers for both signal frequencies and a third frequency divider for the key frequency and a fourth frequency divider for the synchronization frequency are connected for the fundamental frequency. equations:

fl '= fQ

m2 f2 = fQ where ml i m2> 1 ral fu> fs

fs = fQ

mT · m2 3 57909 In this context, the equations used have the following meanings:

Base frequency fQ. Signal frequency fl, f2 Synchronization frequency fs Key frequency fu Constant ml, m2

The above connection generates two signal frequencies with rectangular signals which, due to the fundamental frequency division, are also stable and, due to the effect of the synchronization frequency on both frequency dividers, are frequency synchronized with the signal frequencies. Because this circuit is built exclusively on digital technology with commercial and low-cost TTL circuit circuits, any kind of frequency control is unnecessary. Since the signal frequencies are constant, it is advantageous to work with a small frequency deviation, i.e. a small difference between the two signal frequencies. Both signal frequencies generated by this single switching device are available for generating information telegrams for keying the frequency of all conductor loops. In order to generate information telegrams, only one toggle switch belonging to the conductor loop in question, corresponding to the value of the separate binary characters of the information telegrams to be communicated, needs to be chosen between the two signal frequencies in each case. In frequency keying, at most only a negligible phase jump occurs or occurs at most, because the signal frequencies used are fixedly connected to each other due to their amplitude and phasing.

An embodiment of the invention is schematically shown in the drawing, and will be explained in more detail below with reference to the block circuit diagram. In this case, it is assumed that the information telegrams must be transmitted via three information channels ΚΙ, K2 and K3, which consist of several sets of binary characters formed by the information to be transmitted, the value of which is represented by two character frequencies. To generate these signal frequencies, a crystal-controlled rectangular generator GR is provided, which generates a digital signal at a frequency fQ. Two rectifiers PTR1 and PTR2 are connected to this rectangular generator, for each of which a frequency division coefficient of 1 / m2 is allocated, respectively. 1 / mL. The constants ml and m2 differ from each other and are greater than 1. The second frequency divider FTU connected after the rectangular generator GR supplies the fundamental frequency fu 57909 fQ to the three parallel series converters PSU1, PSU2, PSU3, which belong to three information channels. On the output side, a second frequency divider PTS is connected to the frequency divider FTU for the key frequency fu, which, by dividing the incoming frequency, generates a synchronization frequency fs, which is given to the trigger circuit TR. This works to synchronize both frequency dividers FTR1 and PTR2 for both signal frequencies f1 and f2. The fundamental frequency fQ of the straight-angle generator GR finally arrives as a clock frequency in the switching device SK; however, it is also possible with a corresponding division (not shown) to use a synchronous frequency for the switching device SK, the value of which is between the fundamental frequency fQ and the key frequency fu. The function of the switching device SK is, depending on the information and / or data conducted via the lines L1, L2, to prepare the information telegrams for the three information channels K1-K3 in connection with the stored data and taking into account the current method rules.

For the frequency dividers FTU and FTS, there is a total allocated frequency divider for dividing the fundamental frequency fQ, which corresponds to the smallest common multiplier of the frequency division multipliers l / m2 and 1 / ml to obtain the signal frequencies f1 and f2 from the fundamental frequency fQ. Thus, the synchronization frequency fs is calculated from the expression fQ / ml-m2. For the frequency divider FTU, in order to generate the keying frequency fu, the unmarked division factor is selected so that the synchronization frequency fs relates to the keying frequency fu approximately as 1: 5 ·

The signal frequencies f1 and f2 arrive simultaneously at the inputs SRI, SR2 and SR3 of the three converters allocated to the information channels K1 to K3. Each of these sequentially or simultaneously controlled converters has the task, corresponding to the predetermined, successively following values of their respective parallel series converters PSU1, PSU2 and PSU3, corresponding to the information telegram transmitted along the information channel to form a corresponding character frequency series. In this case, the keying frequency fu determines the frequency, and the parallel series converter PSU1-PSU3 determines whether separate telegraph steps are to be transmitted at one or another signal frequency.

It is essential for the switching device according to the block switching formula above that all the structural groups involved in the development, distribution and processing and described so far are constructed using commercially available digital units. Due to the special dimensioning of the frequency dividers, in particular the frequency divider, in order to develop the synchronization frequency fs, it is particularly advantageous to synchronize both frequency dividers FTR1 and FTR2 in such a way that Since both character frequencies f! and f2 phase synchronization takes place for all information channels K1-K3 only once with the trigger switch TR, the cost remains constant and small regardless of the number of information channels.

Each information channel K1-K3 has a changeover switch SRI, SR2 resp. Low-pass filter TP1 connected after SR3, TP2, resp. TP3, whose function is to suppress the harmonics of the rectangular signal frequencies f1 and f2. This provides sinusoidal signals which are amplified in the amplifiers VR1, VR2 and VR3 connected after the low-pass filters and further passed through the transformers U1-U3 connected after the amplifiers. This can take place directly via wires or wire loops connected to the transformers or also indirectly via a special modulation method (not shown).

According to the modification of the embodiment shown, instead of the low-pass filters TP1-TP3, it is possible in the information channels K1-K3 to reserve only a low-pass filter for each of the two frequency dividers FTR1 and FTR2, so that the changeover switches SR1-SR3 receive sinusoidal signals instead of digital signals. This measure is particularly advantageous when there is a large number of information channels, since the cost of the filter connections in that case becomes very small.

Another modification with respect to the switching device is that the frequency divider FTS for the synchronization frequency fs is connected directly to the rectangular generator GR. In this case, however, a different frequency division coefficient than in the embodiment must be reserved for the frequency divider FTS, because the frequency division with the frequency divider FTU no longer needs to be taken into account. In any case, the following is true: fs = fQ / ml * m2.

The frequency dividers FTR1 and FTR2 do not give any symmetrical signals. If the low-pass filters TP1-TP3 are to be controlled by symmetrical signals, i.e. signal frequencies with a keying ratio of 1: 1, a flip-flop must be connected after each frequency divider FTR1 and FTR2, which is also synchronized by trigger switching TR. In this case, the fundamental frequency fQ of the rectangular generator GR must be doubled. This increased frequency must be taken into account when dividing to the keying frequency fu and the synchronization frequency fs.

Claims 1. A switching device for generating two frequencies in binary signal transmission with frequency keying in telecommunication facilities and remote control facilities, in particular in railway safety equipment, in which two devices are exchanged. GR) for the fundamental frequency (fQ), two frequency dividers (PTR1, PTR2) are connected for both signal frequencies (f1, f2) and a third frequency divider (FTU) for the key frequency (fu) and a fourth frequency divider (FTS) for the synchronization frequency (fs), via a trigger circuit (TR) are connected to both frequency dividers (FTR1, FTR2) for signal frequencies (fl, f2), whereby the separate frequencies satisfy the following equations:

fl = fQ

m2 f2 = fQ where ml Φ m2> 1 ml fu> fs

fs = fQ

ml-m2 Switching device according to Claim 1, characterized in that the frequency divider (FTS) for the synchronization frequency (fs) is connected to the output of the frequency divider (FTU) of the key frequency (fu).

Switching device according to one of Claims 1 or 2, characterized in that switching devices for integrated technology are used for the frequency dividers (FTR1, FTR2, FTU, FTS).

Switching device according to Claim 1, characterized in that an alternating switch is connected to each frequency divider (FTR1, FTR2) of the signal frequencies (F1, F2) via a low-pass filter (TP1, TP2, TP3) for each information channel (K1, K2, K3). which, for the individual binary characters of the information telegram to be generated, switches through the character frequencies (f1, f2) determined by the values of the binary characters.