DE1082947B - Correlation arrangement for several message senders with equal rights who use the same transmission path to a common receiver - Google Patents

Description

GERMAN

The invention relates to correlation means for a plurality of message broadcasting stations, the means being so designed are that of the places that can send over one and the same transmission channel, only one at a time sends. It should be noted here that this result is not achieved by a compound described in cyclic order each of the bodies is allowed to send, but by having each body while they are at any time can receive a message to be transmitted, is provided with means that convey a knowledge of whether the Transmission channel is free, and allow this message to be sent as soon as this is the case without interference can occur with another body.

The main difficulty thus is that at any time the pail can enter that transmission channel is free, and two or more bodies would be able to transmit at the same time, which should be avoided at all costs must become.

A similar problem has already been posed and solved in French patent specification 1135 756, in which However, there are only two broadcasting stations. The messages in question are (as well as preferably in the present invention) transmitted in the form of coded voltage pulses.

According to the aforementioned patent, the two locations for this connection are provided with means for Sending of claim signals provided, which precede the actual message signals and a have a predetermined duration, which is greater for a position that can be designated as a preferred position is than the other, non-preferred position, the non-preferred position having means for adjusting its Transmission is provided when the stress signals from the two bodies occur simultaneously.

However, the system of the aforementioned patent is basically much simpler than that of the present invention in which a relatively large number of digits, e.g. B. ten digits is available. Therefore, special means must be used.

The solution already mentioned, which consists in that each station sends in sequence, is with certain Applications are not advantageous because there is an additional control connection to determine the sequence of the places required and, on the other hand, the transmission of the message is generally delayed.

The invention relates to a correlation arrangement belonging to a number of more than two equal transmitting stations for successive transmission of the messages stored in the memory of one or more of the mentioned places over a single transmission path using a narrow frequency band. she is characterized in that the mentioned points correlation arrangement for several

equal news broadcaster _r

which use the same transmission route

to a common recipient

use

Applicant:

NV Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)

Representative: Dr. rer. nat. P. Roßbach, patent attorney,
Hamburg 1, Mönckebergstr. 7th

Claimed priority:
France 21 November 1957

Michel Le Diberder, Le Rainey, Seine-et-Oise

(France),
has been named as the inventor

are connected parallel to each other with the mentioned path, each point

a) is set up to send a stress signal as a function of the receiving means, the duration of which is characteristic of the relevant point and which is sent out if at the same time this point contains messages to be transmitted and the transmission path mentioned is free;

b) by means of receiving means before and at the end of the transmission of the mentioned stress signal and determined during a very short time interval, which is the same for all positions, whether the mentioned Transmission path is free or busy;

c) the mentioned means for transmitting the stress signal are returned to their initial position, when the receiving means indicate that the mentioned route is busy;

d) emits a locking signal, the duration of which is greater than the duration of the longest stress signal, when the receiving means indicate that the transmission path is free;

e) for sending the messages contained in the memory of the relevant point after the locking signal has ended is set up.

009 529/193

3 4

In the arrangement according to the invention, every

The direction transmission point is provided with means through which it finds a single transmission channel V each message transmission can send a distant signal before bands, whereby only a narrow frequency band is available that does not contain a message, but is the point. The messages are preferably transmitted (ie initially having a characteristic duration, the transmission 5 being the distant signal and then the actual message) in this distant signal as a result of a suitable starting arrangement in the form of a pulse code, according to French patent specification 1 148 628, which is dependent on the absence of a signal in the transmission path is a resting frequency. This point is one of a group of more than and two adjacent working frequencies application two points that take place via a common transmission. (The coded message signal can be sent in the frame channel. This distant signal consists of an io of the present invention from any number of first parts with depending on the relevant point of the group of working frequencies or a single frequency of different duration, which is a short subordinate .)

refraction that allows the body to be followed by Fig. 2 shows the type of signals that according to the invention

suitable associated means, any signals from the other application, can be used to cause points of the group in the transmission path to receive the messages as quickly as possible to the central receiver R and from a second part, the duration of which is transmitted for all, with certain interference Place the same and longer than the longest of the first (overlaps) of the broadcasts of the different places parts of the distant signals of the places of the group. To be avoided if received. Opposite each line, which is provided with the catch of any signals causing the mentioned trains- names of the point 51, S2, ..., 55, the ordered receiving means is not only the setting of the 20 complete signals that the point in question can send out , Broadcast, but at the same time the return to the displayed,
Starting position of the starting arrangement for the distant signal. These signals consist of a part SEI, SE2, ...,

The mentioned first part of the distant signal is named after SE 5, which is referred to as the "stress signal" and standing as the stress signal, during the duration of which the second part is called the locking signal differently at different points. 25, an interruption I, during which the station The lengths of the stress signals are not sent after the no signal (this interruption is short and graduated for digits, and a locking signal if it all digits of the same duration), furthermore a part is sent once , aims to allocate the transmission channel SF, the "interlocking signal" or "monitoring with priority to the calling station, if the signal" is designated and whose duration, which is the same for all-claim signal of another station during the 30 borrowed stations, is greater than that of the long-duration of this locking signal occurs. most stress signal (SES) is, and finally

The invention can be used in particular in the remote control part SC, which consists of the actual transmission to be transmitted, remote signaling in telephone systems, iron-coded messages,
tracks, etc. can be used. It is clear that an arrangement according to the invention

In the following, the invention is only effective when the term of the circle is calculated Guide examples, which is carried illustrated in the drawings, and that each body either send or are explained in more detail. can receive, but not both at the same time. If e.g.

Fig. 1 shows the block diagram of a group of at a certain moment no signal in the transmission, pathway is available, a body that hears and

Fig. 2 is a timing diagram of the signals of the locations and 40 has a message to be transmitted, "decide",

Fig. 3 is a block diagram of a point according to the invention to send a claim signal, but it takes one manure. certain time before this signal is actually sent

It is z. B. assumed (Fig. 1) that several, however, so that the case may arise that two places are not too many places, z. For example, five places at the same time "make the same decision" to send their Bean-51, S2, ..., S5, with a central receiver R. This call signal.

Bodies are with each other and with the recipient

connected to a common transmission path, e.g. B, has the message to be transmitted, endeavors to select this from a cable F, although the invention also applies to radio transmissions. In order to check this, the body first hears which tragung can be used. Each place is with channel off, and if the channel is free, the part SE is provided with a memory Ml, M2, MZ etc., which sends out the 50, and then the channel can then be stored for messages, which is indicated by the arrows f tapped on the second time, because there is the possibility of the upper side being indicated. The messages in question - that in the meantime also - can be sent to another body one after the other or at the same time with the.

arrive at different locations, and it is desirable that 1. A signal from another location is received,

these messages to the recipient if possible without 55 The body is using means for stopping its broadcast Loss of time, and before it is provided by others, later, and it starts in turn due to a claim can be influenced, forwarded chungssignal to, as soon as it is possible, d. H. as soon as will. the transmission channel is again free.

To emphasize the importance of such a system. 2. No signal is received. In this case

lift, z. For example, suppose that it is five 60 the station sends the locking signal SV (and then the signal SC when the axle bearings of railway material have warmed up ). If another body that is about to act, e.g. B. to send detectors of the type in which it is in the French and described in French Patent 1133 052 detected during the interruption. has that the transmission channel is free, at the same time as the axle bearings that have warmed up can be detected at any point in the signal SV of the first position by sending out a corresponding display, there is because the signal SV is longer than each one is drawn. These displays must be transmitted without delay, a moment in which this tion, indicating its geographical location, stops sending to the other location and listens while the central office is forwarded before signal SV is detected here: that is, it arises which is that another axle bearing may also have warmed up, but this time to the detriment of this situation. 70 other body that has to stop broadcasting.

5 6

The signals can ζ. B. DC voltage changes 1. The transmission path is free, which is evident from the presence, possibly with a carrier frequency, that is to say a voltage of -12 volts, the signal SC has the same or a different type. is applied by Dl and dl ,

The claim signal preferably consists of 2. there is a message to be transmitted, which is shown in

a broadcast with a resting frequency, just as the 5 is indicated in the same way by <? 3 and ä.2,

Lock signal, while the signal SC alternately 3. the multivibrator H is in the rest position, which is through

contains the working frequency and the resting frequency. Is displayed on <? 4 and dZ,

In this way, the central receiver, which flips over at it, gives the flip-flop 51 and the counter C

The output only supplies signals with an operating frequency, which begins with the pulses supplied by the multivibrator H.

so-called pre-signals, which count the actual message io,

go ahead, not again. Furthermore, the transistor amplifier stage A 2 with the

In the following, the structure of a point is described, output terminals 0 and 1 of the diode network Z

which makes it possible to send out a signal according to FIG. bound and switched so that it is through the line eO

In order to standardize this structure, the positions that gate G controls are made, the arrangement being made in such a way that

all set up in the same way and the only difference is that the gate is locked for positions 0 and 1 of the counter

is unlocked by a special circuit part from each other, around and for the thirty other layers. That's why

the stress signals are lost depending on the location when the transmitter E transmits on its idle frequency,

of different durations. this frequency differs from the one corresponding to terminal 2

The point under consideration (Fig. 3) consists of a TeIe counting position sent to the transmission channel,

graphics transmitter E, which is connected via a gate or an electro- 20 The flip-flop 5 2 is connected in cascade with 51,

niche interrupter G feed the transmission path V In the standby state, 52 is in a position that as

can. As already mentioned, the transmitter E is able to be referred to on working situation and in which one

to send at a certain resting frequency. A unified voltage is applied to the diode di . The diodes d4 and d5

if it folds Receiver D (amplitude detector) is directly an "and" cell, and the line e5 connects the

bar connected to the transmission path and allows 25 diode d5 with one of the terminals of the network Z each

it to check whether this is busy. He has two postings. In this way, if as a result of the

gears DO and Dl. If the transmission path "occupied counting a suitable voltage on the relevant

is, there is a potential of z. B. clamp occurs, a reaction impulse through the capacitance

-12 volts and on the second from 0 volts. When the road capacity Q and the line once e6 to the flip-flop

is free, these values are reversed. 30 51 that tips over, causing the counting to stop and the

The memory M receives the post-counter to be transmitted C is reset to the zero position, and for

judge. It consists of z. B. six flip-flops, the other applied via dl to the circuit 52, which is in the

where the first four store the number of the digit comes to sleep. Since the count is back to zero

and the last two the actual message, which is on hold, the transmission of the claim

Input is indicated by arrow f. 35 signal ended. It should be noted that in this

Fig. 3 also shows a counter C, which also assumes the working position at the moment the multivibrator.

The multivibrator H oscillates as before; the

forms that the transmission of the complete signal interrupt J begins with the first half period,

controls the mentioned last working position of the multivibrator by means of an assigned diode

network Z, also a device S for training 40 separates its next rest position. During this time it is

the actual messages for modulating the transmission, the gate G is blocked, and the detector D hears the over-

ders E and a group of two start flip-flops tragungsweg from.

51 and 52, which are equipped with transistors, in Korn- Here it should be noted that it is useful to eavesdrop

bination with transistor control amplifier stages Al, A2 , it is necessary that the total duration of the short

and A 3, and finally other auxiliary elements, which after interruption I last longer than the time constant of all

are explained in more detail below. Circles of the transmission path and the detection

It is z. B. suppose that the counter C must be five. There are therefore two options:
There is flip-flop. A multivibrator H oscillates A. Another station sends, and there is a permanent one (e.g. with a frequency of 25 Hz). This voltage at DO and at the diode dO. If the multi-multivibrator feeds the 50 vibrator H in the rest position in each of its working positions, a counter C results from the connection el, and when it is free - voltage across d6 and the "and" cell that is made up of the , the counter can consist of the whole series of its two-and-a- half diodes dO and d6 . This makes the transistor thirty different states of equilibrium effective through amplifier stage A3. It should be noted that the run. As a result of the presence of a network of amplifier A3 can only be effective if the misappropriated diode (Z), which is in operation in multiple circuit with amplifier A2 , so that the station itself ceases to eavesdrop on the various points of the counter's flip-flops. If the "and" conditions are bound, a dO ~ d6 can be fulfilled for every state of equilibrium, A3 sends current through the line characteristic counting voltage to the output terminals, whereby the flip-flop 52 are generated in the standby of the network Z , the numbers 0 until state is reset. Otherwise, as long as 31 wear. The flip-flop 60 blocks the other position through the line e2 , the gate d1-d2-d3 blocks and S1 the counter C and keeps it at "zero" (which is a counter in position 0.

at the output terminal 0 of the network Z. It does not send anything else. Since the three start speaks), if this flip-flop 51 one of its two conditions are met, the counting starts again at 0, assumes stable states of equilibrium. however, this time the flip-flop 52 is in one

The flip-over of flip-flop 51 to enable 65 condition that cell d £ -d5 does not generate a bias,

the release of the counter C takes place under the control. The counting thus takes place simultaneously with the transmission of the

of the amplifier stage A1, which in turn is triggered by an "and" locking signal SV (this transmission starts with the

Circle is controlled from the connection of the three position 2 of the counter). If the counter corresponds to the terminal

Diodes dl, d2 and d3 consists. If the three fol- 25 and the subsequent clamps are in the corresponding position

The following conditions are met: When 70 is reached, the arrangement S scans that of a group

consists of diode "and" cells, the message elements contained in the memory M in order to modulate the frequency of the transmitter E accordingly, whereby the message can be transmitted via the transmission path V.

When the counter finally reaches a position corresponding to terminal 31, a reaction pulse is generated by the capacitor Q 2 and the lines e7-e8-e3, through which the memory M is reset to 0, while the flip-flops B 1 and B 2 continue lines e9 and elO are also reset to the zero position. As already explained, the gate G is blocked. The station thus returns to the standby state and waits for new messages to be transmitted.

Claims (4)

Patent claims: 1. Correlation arrangement belonging to a number of more than two equal transmitting stations for the successive transmission of the messages that are stored in the memory of an or several of the mentioned locations can be stored via a single transmission path under Use of a narrow frequency band, characterized in that the points mentioned are parallel are connected to each other with the mentioned path, each point a) set up as a function of the receiving means to send a stress signal is, the duration of which is indicative of the point in question and which is sent out when to at the same time this point contains messages to be transmitted and the transmission path mentioned free is; b) by means of receiving means before and at the end of the transmission of the mentioned stress signal and during a very low one, for all locations at the same time interval determines whether the mentioned transmission path is free or busy; c) the mentioned means for transmitting the stress signal are returned to their initial position, when the receiving means indicate that the mentioned route is busy; d) sends out a locking signal, the duration of which is greater than the duration of the longest stress signal, when the receiving means indicate that the transmission path is free; e) for sending the messages contained in the memory of the relevant point after the locking signal has ended is set up. 2. Arrangement according to claim 1, characterized in that the means mentioned at each point to send out the locking signal to determine the duration of this locking signal Multivibrator included, the output of which is connected to a counter, with the various digits of the system differ from one another in structure due to the connection selected for the output terminal of the counter mentioned. 3. Arrangement according to claim 1, characterized in that said receiving means consist of consist of an amplitude detector. 4. Arrangement according to claim 1, characterized in that said stress signal and the mentioned locking signal consist of transmissions with a so-called rest frequency while the messages to be transmitted in the form of a combination of transmissions with the so-called Rest frequency and emissions are transmitted with a so-called working frequency. 1 sheet of drawings © 009 529/193 5.