DE2018325A1 - Radio messaging system - Google Patents

Description

Dtpi.-lng. Dfpl. o * c. putrf. DIETRICH LEWINSKY

PATENT ADVOCATE
8 Mönchertfl-Gotthcirdstr. 81 April 16, 1970

• Telephone P * 17 Λ2- ■ ■ '

6O2O-IV / He.

SODETEQ - Socie'te d'Etudes Techniques et d'Ent§ £ $) ri8es öehe'-rales, Le Plessis Robinson, Avenue Riaumur 9 (France)

"Radio messaging system ¹¹

French priority dated April 16, 1969 from the French patent application no. 69/11 766 (Seine)

The invention relates to a radio communication system in which messages or other information elements, which can be subdivided into groups, can be transmitted in the breaks between television programs using the carriers and television transmitters. \

It is known that under certain circumstances a television program can be interrupted for a few seconds without the television viewer being disturbed thereby; qULes is possible in particular during the fade-in or fade-out of the fixed image before the »start of the program, during a change ^ ⁸ in the program ραβί» at the end of the program. ;

It is also known that a * signal, which is structured in the same way as the standard video signal, is used as a carrier for any information

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mations and can take the place of the video signal during the breaks in the television program. For example, instead of a part of the signal corresponding to a line, a series of pulses can be used; one corresponding to one field portion of the signal can thus serve as a carrier for a message of a certain length and there usually 50/2 images are sent per second _t the image carrier can be numerous messages aufmodaliert during a barely discernible to the viewer program interruption. The sound carrier can also be used as an information carrier during this time.

However, certain problems arise when trying to transmit any messages in a code that is the same form how the television signals got and if these messages only from one or a certain number of receiving point within of a very specific group of participants are to be received.

In fact, there is currently no known satisfactory system that allows the pauses within a television program to be tracked to send messages directed to a specific group of subscribers or subscribers or, more generally, Selectively addressed different groups or categories of messages to be sent to different groups of recipients.

The invention is based on the object of creating such a system which is particularly suitable for sending out messages that can be brought into binary form.

This task is preliminary in the radio communication system

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specified type solved in that the system according to the invention contains a coder and shaper for the messages, which at slow speed recording a sequence of "words" called, encoded parts of the message, for example on a magnetic tape, the words in such a way are built that every word, now at high speed read by a transmitting device, a signal of the same form as the television signals generated, and receiving points provided which selectively receive at least one of the groups of messages and record them, for example, on a magnetic tape, each receiving point being equipped with a converter is that of the received messages recorded on the magnetic tape in plain text, for example on the paperboard tape a typewriter.

A certain number of η pulses forms a symbol. A certain number of N characters forms a word. A character is transmitted in the form of a series of pulses that have the role of a cell signal. A word is treated like a Field. The messages of the words belonging to the different groups are sent using the time division multiplex method.

If, for example, five groups of recipients or subscribers are specified, then the message transmitted to the recipients of the first group is contained in the words with the number 1, 6, 11, 16 ₉ ... The message for the second group consists of the words with the number 2, 7, 12, 17, ... For the fifth group, the words with the number 5, 10, 15, 20, ... are determined accordingly. The numbering i

the words count from the beginning of the transmission. ·

The transmission of each character goes through a synchronization _; impuls S ahead. In the binary code, the character is represented by the I

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The presence or absence of pulses at the tent points ti, t2, ... tn, which regularly follow one another after the synchronization pulse of the symbol ι , is clearly determined. The number N is preferably equal to or almost equal to the number of usable cells per field according to the line standard for which the transmitter is designed and "is, for example, three hundred in the case of the six-and-twenty-five-line standard for a frame.

The transmission of each word is followed by the transmission of a word synchronization signal ahead, which plays the role of the image

slgnales while watching TV. This signal is longer than the character synchronization signal so that it can be easily distinguished upon reception.

The transmission of a message consists of six consecutive ones Routes together:

1. Record each binary coded message on an appropriate one Data carrier, for example a punched tape.

2. Creation of a second data carrier, which can also be a punched tape and the first N characters one after the other of the first message, then the first N characters of the second message, etc., followed by the N characters the first message containing the N characters following the second message and so on. At the beginning each of N characters existing word, a special word synchronization code is recorded on the data carrier.

3. Transfer of the recorded message from the data carrier onto a magnetic tape at slow speed.

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¹ I. High-speed scanning or reading of the message now recorded on the magnetic tape and sending this message over the television network.

5. Recording of the sent message by the recipient at the high speed corresponding to the sending speed on a magnetic tape.

6. Recovery of the information recorded on this magnetic tape in plain text and at a slower speed.

The signals used to transmit the messages have the same form as the television signals, so that the The system according to the invention has the advantage that no adaptation whatsoever the facilities of the television station is necessary.

The system according to the invention can in particular advantageously are used where it is a matter of transmitting messages or other information elements that have a certain have a systematic structure and are broadcast regularly, for example daily or twice a day. This applies, for example, to weather forecasts, stock exchange prices, sports results, the creation of lists, catalogs or Administrative instructions, certain press services, certain messages for the police, such as stolen vehicles or wanted persons.

In the drawing is the radio communication system according to the invention on the basis of a diagram and several exemplary selected embodiments shown in the block diagram illustrated schematically. There are:

Fig. 1 shows the waveform of a character with preceding synchronization signal,

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Fig. 2 shows part of the system used for recording the messages serves on a Lochstrelfen,

Fig. 3 »the recording of the messages on a magnetic tape, starting from the punched tape according to FIG. 2,

Fig. 4 S9HHF part of the system required for sending,

5 shows the block diagram of the receiver,

6 shows another embodiment of the receiver,

7 shows a part of the system "* den" p for recovery serves the news,

8 shows a further embodiment of the receiver,

ι «

ι Flg. 9 shows another embodiment of the for the recovery of the j Message serving part *

The graphical representation of the signal curve in FIG. 1

lets first recognize the synchronization signal S that the Beginning of each character precedes. Each character is reproduced in the seven-bit code chosen here, where in known catfish the occurrence of an impulse to one of the Points in time ti to t? can correspond to a binary one, while the lack of momentum to any of these tent points can symbolize a binary zero.

2 to 6 illustrate a preferred embodiment of the radio communication system according to the invention and relate, for example, to the transmission of messages intended for five groups of recipients, each message being composed of characters of the type shown in FIG. ' . 'I'

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The messages to be transmitted are recorded in binary parallel code on punched strips 1 to 5 according to the known method, a reading head 6 to 10 is located above each punched strip. A rotating switch or an equivalent electronic circuit switches the reading heads 6 to 10 to the punch 12 one after the other. A special code, which marks the beginning of the transmission; * i> *, has already been punched into the punched tape 13 beforehand. The punch now transfers to the punched tape 13 the. Laughter scanned by the read head to which it is connected at this moment via the arm 1H of the switch 11. In reality, however, this switching arm I ¹ I connects each reading cell of the respective reading head with the corresponding hole punch of the punch 12. For the sake of greater clarity, however, single-wire connections have been used throughout the drawing; of the perforated tape 13 by means of an electrical pulse, the step-by-step synchronized further movement of that drive motor Ml to M5 for the punched tape 1 to 5 to which it is currently connected, i.e. the motor Ml in the case shown. As long as the switching arms 14 and 15 are in the position shown, the perforations of the perforated strip 1 are transferred to the perforated strip 13 or copied.

A counter 17 counts the pulses emitted by the drive motor 16. When the number reaches the value N, that for the number of the characters per word is defined, the counter jumps back to zero and controls the punching of a word synchronization code and then outputs a pulse to the motor 18 which causes the changeover switch 11 to move into the following position.

The word synchronization code can consist of a simple punch on a special track. Preferably will However, a more complex code is used, e.g.

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rere successive perforations on this particular track or on several tracks. has and the group of messages from which the following word comes from. In this way, the recognition of the group to which the word belongs relieved when receiving.

After the changeover switch 11 has now reached the next position, the N first rows of holes in the perforated strip 2 are umkoplert in the same way on the punched tape 13, on it After punching a new word synchronization code and turning the switch 11, the N first rows of holes in the punched tape and so on.

The information recorded on the punched tape 13 is now transferred to a magnetic tape with the help of an arrangement, from the one preferred embodiment in Pig. 3 is shown.

The punched tape 13 passes under a reading head I ¹ I.

, The amplified and regenerated impulses are applied to the decapitators
, drawing / 15A headed, which each have a special trace of the

Magnetize the magnetic tape 16. The logic circuit 17A responds to _s when a signal is present at the output of at least one of the reading cells of the reading head 1H and supplies a: pulse to the recording head 18A. This magnetizes; a special track called a character synchronization track. When the read cell recognizes a word synchronization code, it sends a pulse or a series of pulses to the head 19A, the track called the word synchronization track; magnetized.

! The magnetic tape 16 moves at a relatively low constant 'ter speed which is in a precisely known ratio to ¹ dei hole transport speed of the strip. 13

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The tape speed of the magnetic tape l6 can for example be of the order of 5 cm per second and the Recording density can be 100 pulses / cm or 100 bit / cm, from which a transmission speed of 500 Characters per second results. If the punched tape 13 contains four characters per cm, the transport speed of this tape becomes fixed at 125 cm / s.

After rewinding, the magnetic tape 16 is fed past the reading heads 15B, 18B and 19B (FIG. 4) at high speed. The signals read by the heads 15B represent each character in parallel code. After amplification and regeneration, these signals are fed to a shift register 20 with "parallel inputs and a series output. The symbol synchronization signal is read out via head 18B and after amplification and regeneration in amplifier -21 it controls the input to shift register 20 and simultaneously delivers to the synchronization input 22 of the transmitter 23. The same signal, after being somewhat delayed in the circuit 25, triggers the clock generator 25A, which empties the shift register 20. The output signals of the shift register 20, which reproduce the character in the binary serial code, arrive at the signal input 2 ¹ I of the transmitter 23. Whenever it is triggered, the clock generator 25A supplies the same number of pulses as there are bits for a character and, of course, are used as actually used memory locations in the register 20. The repetition frequency of these clock pulses serving as shift pulses is equal to d em reciprocal of the selected time interval between two bits of the same character, ζj. ti - t2.

According to another embodiment, the shift register 20 can be made up of delay circuits with

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A staggered delay arrangement, which converts the parallel information coming from the heads 15B into series information, can be replaced. '.

The word synchronization signal picked up by the reading or reproducing head 19B is amplified and regenerated in the amplifier 26. It triggers the generator 27A, which sends the signal identifying the beginning of the word to the transmitter 23, which takes on the role of the image / synchronous signal used in the transmission of television images.

To make it easier for the reception to recognize the group ₍ <where a word belongs, it is advantageous to give the synchronization signal a form that differs from word to word In this case, the same synchronization signal is always used for each word and the group E to which the word belongs is identified by a coded signal that is sent over the sound carrier the duration of the transmission of the previous word and possibly also during the start of the transmission of the associated word, in such a way that sufficient time is available at the receiving end to recognize the correct group j This signal is generated by a special bait 27B can result in the transmission of a characteristic audible frequency or a series of audible impulses of this frequency, the ei ne specific temporal distribution exist. Furthermore, you can give a special code signal to the signal input 24 of the transmitter 23 and that before the transmission of the first character of the word.

Additionally and shortly before the transmission of the news

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a start signal is given via the transmitter. This signal has the task of triggering the recording device in the receiving stations so that they reach their final speed has already reached at the time of the start of the transmission of the messages. A convenient way of using this command To transmit, consists in modulating a suitably coded signal on the sound carrier. This is the task of the generator 28, 'the output of which is at the audio input 29 of the transmitter 23. The code can be accurate in simultaneous transmission known audible frequencies or a series of audible impulses, the latter temporally after a certain Code are modulated.

In addition, a special code signal is issued at the end of the transmission.

A coded signal characterizing the beginning or the end of the transmission can also be transmitted via the image carrier the input 2Ί of the transmitter 23 are transmitted.

The frequency of the word synchronization signals becomes the same or selected to be approximately equal to the cell synchronization frequency for which the transmitter 23 is designed. Unless it is a transmitter according to the six hundred and twenty-five lines / 50 fields / s standard This frequency is 15625 Hz. The density of the recording on the magnetic tape is assumed to be 16 to 100 bits per cm, the tape speed of the magnetic tape 16 is then about 156 cm / s.

At the receiving station, the information relating to a group of the message is initially transmitted at high speed recorded on magnetic tape and then in its original form at much slower speed restored, i.e. in an appropriate device

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like an electrically controlled typewriter in plain text recovered.

A preferred embodiment of the receiving point is illustrated in FIG. The received signals are amplified and demodulated in the amplifier demodulator 30. The circuit 31 separates the audio signals, the information signals and the synchronization signals from one another and outputs them via the corresponding outputs 32, 33 and 3 ¹ I. The signal modulated onto the sound carrier is decoded in circuit 35. When the start signal has arrived, the decoder controls the relay 36, thus triggers the start-up of the tape drive * motor for the magnetic tape 38 and also puts all logic circuits into action. Of course, when the signals for the beginning and the end of the transmission are transmitted via the video carrier, the decoder 35 is connected to the information output 33 of the circuit 31. The circuit 39 separates the character synchronization signals and the word synchronization signals from one another, each criterion serving for their different duration. The word synchronization signal reaches the counter ⁴ IO, which divides the input signals by five. The counter HO can be preset. It provides an output voltage when it reaches the zero position.

When the counter is set to five, the first word sync signal triggers the appearance of a voltage on Output Ml of the counter off. This tension disappears when second signal, occurs again between the sixth and the seventh, between the eleventh and the twelfth signal, etc. on. By presetting the counter 40 to the position four causes the first signal to move into position five and the following signal brings it to position Zero. From this moment on and until the next signal, the counter supplies an output voltage, the same thing happens

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between the seventh and eighth signals, between the twelfth and thirteenth signals, etc.

Depending on the presetting of the counter HO , an output voltage appears at kl only during the transmission of the characters of a message from a very specific group. This message is used to enable a port * J2 which controls the transmission of the information to the management tape 38.

In another embodiment of the system according to the invention, as already mentioned, the form or structure of each word synchronization signal is an identifier for the message group to which this word belongs. In this case, the presettable counter Ho is replaced by a decoder that determines the group to which the word belongs. If the code corresponds to the group that is to be received, the decoder supplies a voltage that switches gate k2 through. This voltage remains until the following word synchronization signal arrives. If the signal for recognizing the group to which the word belongs is transmitted before the beginning of the word and via the image carrier, the input of this decoder must of course be connected to the information output 33.

j If use is made of the embodiment in which! the group to which the word belongs is identified by a coded signal transmitted via the door carrier, the block diagram according to FIG. 6 takes the place of the block diagram according to FIG comes, brings the flip-flop H6 into the state zero or into the state one, depending on whether the gate 47A or the gate kJB is permeable. The permeable

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switching these gates is controlled by the relay 18, which can also be replaced by a corresponding electronic circuit and which is itself controlled by the decoder 19 for the audio signal. When this decoder has recognized the code of the next V / ortes consisting of characters to be transmitted, it lets the relay 18 pick up. Since the occurrence of the word synchronization signal, the flip-flop kS has been brought into its state 1 and switches the gate 12 through so that the signals can be counted on the magnetic tape plug-in. With the following synchronization signal, the relay IB drops out and the gate 17A then switches through, so that the flip-flop circuit 16 returns to its zero state and thus the gate 12 blocks. The symbol synchronization pulses are sent to a mono-stable multivibrator 15 This flip-flop controls the transparency of the gate 12 for the entire duration of the transmission of a symbol, i.e. for a duration that is slightly shorter than the time interval between two successive symbol synchronization pulses. As long as the gate 12 is switched to be permeable, the character signals arrive one after the other via a serial input on a register 13 with parallel outputs. When the one-shot multivibrator 15 returns to its stable state, it issues a read command to the register, which clears the register. The output signals of the register are amplified and control the recording on the magnetic tape 38 on the magnetic tape 38 on parallel tracks via the magnetic recording heads 11.

According to another embodiment of the invention System can register 13 by an arrangement consisting of delay circuits with staggered delay times be replaced, in which the individual circuits are successively connected to the output of the gate 12. The delay

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tents are set so that the output signals generated by the circuits reach the heads M at the same time.

At the end of the transmission there are the signals from the heads 15B were scanned by the magnetic tape 16 on the transmitting side and by the presetting of the counter or the Decoder 40 or 49 belong to a specified group of messages, in the same arrangement on the magnetic tape 38. Its tape speed is in the same order of magnitude as the tape speed of the magnetic tape 16 *

During the transmission of the constituent parts of other messages the gate 42 is locked and the magnetic tape 38 accordingly receives no AufzelchnungBSignale. The information is thus recorded on the magnetic tape 38 in the form of separate blocks, between which "white areas" lie, the selected Example are four times longer. The end of the transmission will be detected by the decoder 35, which causes the drive motor 37 to stop.

Fig. 7 illustrates a block diagram by means of which the last part of the complete transfer process is carried out can, d * h. the recovery of the information recorded on the magnetic tape 38 in plain text. As an example was an arrangement 'is chosen in which the plain text has an electrical controlled typewriter is obtained.

After rewinding, the magnetic tape 38 is attached to the reading heads 50 showcased. At the beginning, the flip-flop 67 is brought into its zero state, which is characterized in that on the output 69 to be pinched a voltage occurs. This tension; controls the start-up of the belt drive motor 70 via the gate 79 which is switched on.

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After amplification and regeneration in the amplifiers 51 to 57, the signals coming from the read heads 50 are fed to the inputs «ml of shift registers 58 to 6k , each of which has a series input and a series output, via the OR gate 65 and a separator The presence of a signal at the output of any of the amplifiers 51 to 57 indicates the simultaneous shifting of the contents of all registers by one place to the right. The information recorded on the magnetic tape 38 is thus transferred step by step into the registers.

The capacity of these registers is equal to N, the number of characters per word »If all registers are filled, see the reading heads §0 consequently over a non-magnetized magnetic tape 38, which ^{corresponds to a" white space 11} between two words »· .

The circuit 80 detects the absence of the pulses at the output of the OR-Oliedes € 5 . It can be implemented, for example, in the form of a capacitor which is charged by these pulses and which discharges when the latter disappear. The discharge current of the capacitor is used to generate an output pulse. A counter can also be used for this purpose, which counts the pulses emitted by && m OR gate 65 and delivers a pulse when as many pulses have arrived at its input as there are memory locations in the registers.

The output of circuit 80 causes the toggle Flip-flop 67 into state one »The voltage at the output 69 the bistable tilting support WHg disappears - with which the belt drive is shut down »

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The state one of the flip-flop 67 is present when ' a voltage occurs at its output 71 which is transmitted via the control input 73 lets the typewriter 72 start up.

The machine carries out the operations stored in the rightmost positions of registers 58-64 Information (character stop, carriage transport, line feed, etc.).

The execution of this command generates a pulse at the output 7h , which is transmitted by the circuit 75 and brought to a specific form. The output of circuit 75 causes the contents of all registers to be shifted one place to the right. The typewriter will execute the following command and the process will repeat itself.

The counter 76 counts the number of the output 7 ^ the Typewriter 72 incoming shift pulses for the register. If this number equals the capacity of the registers, i. when all stored information is transferred to the machine the counter 76 supplies a pulse to one Input 77 of flip-flop 67, via which it is brought back to its zero state. This makes the control input 73 the typewriter 72 is de-energized and shut down while the tape drive motor 70 starts again and that off The following word consisting of the individual characters is transferred to the register.

The absence of signals at the output of the OR gate 65 for a duration greater than the normal interval between the individual words 1st, it is determined by the circuit 78, which locks the gate 79 and stops the belt drive motor 70.

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In addition, the successive transmission of the "information recorded on the magnetic tape 38 to shift registers and the continuous recovery of this information for plain text can also be carried out by means of other suitable circuits."

If desired ₉ , the magnetic tape 36 is subsequently

! deleted and can be used again to record a new sewing.

According to another embodiment of the system according to the invention, one and the same receiver can serve to receive several groups of messages. For this purpose, the words corresponding to these groups are recorded on one and the same magnetic tape. An auxiliary recording head records on a particular track a coded signal which identifies the group to which each word belongs. When transferring the

A decoder provides information from the magnetic tape to a memory that only words belonging to a certain group can be transmitted. These words are now one after the other printed in plain text by means of a device such as an electrically controlled typewriter as described above; wrote. The magnetic tape is now rewound and runs from anew, while the decoder is on the other group identifying code is brought.

The Pig. 8 and 9 ″ illustrate a preferred embodiment form of this kind. Parts and circuits that fulfill the same punctures in the pig. 5, 6 and 7 are denoted by the same reference numerals.

During the recording, a decoder 85 determines the group from which the word that has just been transmitted comes. Wie b'e-

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reite mentioned, this group is characterized by a special form of the characterized by the synchronization signal supplied by the circuit 39 or by a special form of an upper Sound carrier transmitted audible signal that was sent by a scarf * device 49 is detected, or by a special form of the Video signal. The decoder 85 thus supplies a signal identifying the group of the corresponding hoard, which via a Recording head 86 on an auxiliary track of magnetic tape 38 is recorded.

When the magnetic tape 38 is scanned at slow speed, the auxiliary track is scanned by the magnetic reader 8 7. When the decoder 88 following this recognizes the code corresponding to a specific group, it supplies a voltage which switches the gates 89 to 95 through, which consequently enables the transfer of the information to the registers 58 to 6h . If the decoder 88 recognizes the code corresponding to another group, it blocks the gates 89 to 95 and at the same time supplies a pulse which brings the flip-flop 67 into its state one. As stated above, this process prevents the information stored in the registers from being transmitted to the typewriter 72 and also stops the tape drive motor 70. When the registers are emptied, the flip-flop 67 returns to its zero state and the tape drive motor 70 starts up again. However, the transmission of the information contained on the magnetic tape 38 into the register remains blocked until the decoder 88 again recognizes the signal that characterizes this group the processes follow one another / refer to Flg. 7 described.

A particularly long absence of the signals characterizing a group during the unwinding of the magnetic tape is

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detected by the circuit 78, which thereupon the gate 79, locks, whereby the tape drive motor 70 is stopped. The magnetic tape 38 is then rewound and then runs off again after the decoder 88 has been set to the code corresponding to another group of messages. In the end the messages belonging to different groups are written one by one by the typewriter 72 or printed.

A particular application of this embodiment is: to divide a message into several parts of about the same length and treat these parts as different groups of News. In this way, you can send 2, 3, **, ... times longer messages to a corresponding one during the same transmission time to transmit smaller number of groups of recipients;

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Claims (12)

Dipl.-1 ng. Dipl. Oec. puo /. DIETRICH LIiWINSKY • PATENT Attorney Munich 21 - Gotttrardstr. 81 • Tetefon 5Λ 17 62 April 16, 1970 6O2O-IV / He. SODETEG - Society d'Etudes Techniques et d'Entreprises Generales patent claims t 1. Radio communication system, in which messages or other information elements, which can be divided into groups, can be transmitted in the breaks between television programs and the use of the carrier of a television station, characterized in that the system has a coder and shaper (Fig. 2,3) for which contains the news, the * at slow speed, the recording of a sequence of coded parts of the message called "words" for example on a magnetic tape (13), the words are structured in such a way that each word, now with read at high speed by a transmitting device (Fig. 4), a signal of the same form as the television signals generated, and receiving points (Fig. 5, 6, 8) are provided which selectively at least one of the groups of messages received and recorded for example on magnetic tape (M), each receiving point is equipped with a converter (Flg. 7, 9), which receives the messages recorded on the magnetic tape in plain text, for example on the paper tape a typewriter (72) reproduces. 2. Radio communication system according to claim 1, characterized in that each "word" corresponds to the Ferasehsignalraster, i.e. at- .. - 2 -; BAD ORIGINAL '. 0Q99 & 4/1424 spielswelse corresponds to a field and one to the image sync signal corresponding synchronization character and several characters corresponding to the line signals contain. 3. point messaging system according to claim 1 or 2, characterized in that that the words in a binary parallel code on a punched tape (13) and then on several tracks a magnetic tape (16) are recorded that the transmitter has a device (20), for example a shift register, for converting the signals read from the magnetic tape into a "binary serial code, and that each Receiving point in turn has a device (43), for example a shift register, for restoring the binary Parall codes of the signals for their recording on several tracks of a magnetic tape (38). 4. point messaging system according to any one of claims 1 to 3, characterized in that the encoder and shaper for the messages contain a read head (6 to 10) for each of the message groups and a switch (11) which rotates step by step in a cycle given by the reading speed and one after the other the reading heads (6 to 10) with a punch (12) that creates a punched tape (13) on which successive words Messages belong to different groups. £ 5. Radio communication system according to claim 4, characterized in that the group to which a word belongs is determined by the number of the word counted from the beginning of the transmission. BATHROOM ORIGINAL 3 - 009884 / U24 6. Radio communication system according to one of claims 1 to 5, characterized in that the group to which a word belongs, by a special form of the synchronizing signal of the Word is intended. 7. Radio communication system according to claim 1, characterized in that the group to which a word belongs is determined by a special signal that modulates the sound carrier, and the transmission of which begins shortly before the transmission of the word, and up to the beginning of this word or until shortly after, after lasts. 8. A radio communication system according to claim M, characterized in that the group to which a word belongs is determined by a special signal which is contained at the beginning of the word and is modulated onto the video carrier. 9. Radio communication system according to one of claims 1 to 8, characterized in that on the one hand the transmitter ei ^ benerator, (28) to generate the start-up and stop signals that are transmitted via the sound carrier is sent, and on the other hand each receiving station contains a decoder (35) which these signals; detects and the start-up or shutdown of the drive motor, (37) for the magnetic tape (38) controls. 10. Radio communication system according to one of claims 1 to 9 »characterized in that the start and stop signals to the Image carriers are modulated and each receiving point one Contains decoder that recognizes these signals and the start-up or shutdown of the drive motor (37) for the magnetic tape ι (38) controls. 009884 / U24 11. Point messaging system according to one of claims 4 to 10, characterized in that each receiving part has a specific Group of messages received. ^ 12. Point message system according to one of claims 4 to 10, characterized in that each receiving point (Fig. 8) receives several groups of messages, all of which are recorded on one and the same magnetic tape and the switch connected to this (Fig. 9) the messages recovered one after the other by scanning the magnetic tape several times in succession. 009884 / U24