DE2915195A1 - CIRCUIT ARRANGEMENT FOR REMOTE CONTROL AND REMOTE TRANSMISSION OF INFORMATION EQUIPMENT WITH A HIGH LEVEL OF SELECTIVITY AND RELIABILITY, AND WITH SELF-DETECTING MEANS BETWEEN THE INDIVIDUAL COMPONENTS - Google Patents

Description

PFENNING ■ MAAS · MEINIG · Mockery

- Patent attorneys - KurfOrstendamm 170, D 1000 Berlin 15

We / we

ΡΑΤΕΝΤΆΝλΛ / ΑΟΈ BERLIN · MUNICH

J. Pfenning. Oipl.-Ing. ■ Berlin Dr. I. Maas, Dlpl.-Chem. ■ Some K. H. MeInIg, Dipl.-Phye. ■ Berlin Dr. G. Spott, Dlpl.-Chem. - Munich

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European Patent Office OFFICE BERLIN:
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Id 1000 Berlin 15 Phone:
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Your reference Berlin
Date

April 11, 1979

VOXSON S.p.A. I-OO155 Rome, Italy, No. 286, Via di Tor Cervara

Circuit arrangement "for remote control and remote transmission of information devices with a high degree of selectivity and reliability as well with self-identification means between the individual

Components

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The invention relates to a circuit arrangement. in the remote control and long-distance transmission of information equipment with a high degree of selectivity and reliability and with self-identifying means between the individual components.

In particular, the invention relates to a device having a combination of a transmitter and a or more receivers, in which at least one of the receivers can be assigned to the transmitter, wherein the Arrangement is designed so that the unit of Einrich device allows its use in transmissions that the Requires remote understanding of messages that are exclusively addressed to a specific user, excluding the other users who are included in a number of potential recipients as well as their use in transmissions where a maximum security of the understanding of the message by the exclusive recipient is given which requires the exclusion of all other of the large number of recipients.

A better understanding of the invention emerges in particular from FIG. 1 of the accompanying drawing.

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The Pig. 1 shows a transmitter 1, a portable receiver 2, a mechanical container 3 for the receiver 2, a pair of connections 4,6 and a group of lines 5 · There is also a main switch 7 between an energy source 8 and the transmitter 1, and an antenna 9 and a group of devices 10 for controlling the transmitter 1 are present, which are connected to the transmitter via lines 11 are connected.

This circuit diagram shown in Pig.1 is only valid as an exemplary embodiment and not by way of limitation, since the construction of the system according to the invention involves the allocation of Transmitters and receivers in a large number of diagrams according to requirements and practical use permitted. In particular, the circuit diagram can have a central transmitter and a large number of receivers or a single one Include receivers and a variety of transmitters as well as other intermediate diagrams with m-transmitters and η-receivers.

Before further detailed description of the system according to the invention, the main characteristics of the inventive Systems are mentioned.

First, there are two blocks at both the sender and the receiver, one of which is the logical one

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Circuit and the other forms the analog circuit.

Second, there is the property that the transmission of the bufcode by the sender to the receiver or receivers (or the sender to the receiver or the receivers) is performed using K among N carrier frequencies, so that if one of the channels "is busy or disturbed, the transmission of the message is not changed or significantly prevented will. What they have in common is the availability of means for inserting a pause between the sending of the message provided on the carrier K and the subsequent transmission on the carrier K + 1, this pause with is preceded by such a duration that other transmitters, which are able to asynchronously related to the viewed Carrier to use the same carrier, with a high probability factor the corresponding free one Can find the channel.

Thirdly, there is the property that the transmitted message is related to the remote information code, which is predetermined between the transmitter or transmitters and the receiver or receivers, while each Device is provided with a second information code regardless of the operating diagram, which is always inside

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of the same device that is to be connected in a single integrated system is predetermined, where the code remains secret without transmission over a distance and for the self-identification of the sender and the Receiver of the device is used, which only by means of the direct connection or the like between the Transmitter or transmitters and the receiver or receivers forming part of a single facility beforehand are connected.

For a better understanding, reference is made to i "ig.1.

First state :

A) The receiver 2 previously connected to the transmitter 1 is to be inserted into the mechanical container 3 and then directly through the connections 4 and 6 and the lines 5 are connected to the transmitter 1.

B) Due to the existence of the connection by means of the secret code between the receiver 2 and the Sender 1, the property is automatically achieved at the time of direct connection 6-4-5, with the Main switch 7 remains open, whereby the transmitter is not supplied with energy and the possible operation of the Control elements has no influence.

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Second state:

The receiver 2 is taken out of the mechanical container and away from this. From this moment on or from a predetermined pause onwards, the following occurs: 0) The main switch 7 is closed and the transmitter can be operated by the actuation source 8 ″.

D) The operation of each of the external drivers causes the transmitter to begin operating, wherein the transmitter sends cyclically and permanently until it is switched off.

E) The transmitter sends the only information code, the beforehand for the transmission between the transmitter and the Receiver is provided.

i ¹ ) Accordingly, the receiver works automatically on its end actuator (relay or optical-acoustic signal, or the like) due to the inclusion of its own code.

G) The receiver is put back into the mechanical container 3 .

H) The transmitter sends through the direct link 4-5-6 the signal that it can query from the receiver.

I) The recipient replies by his own code and in the same way as he received the embossing Has.

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K) The sender who received the identity of the code, causes the main switch 7 to open and the transmission to stop.

From the above description it follows that:

a) the system only by removing the receiver 2 from the mechanical container 3 is switched on,

b) the system is only switched off by reinserting the receiver, which was previously through a secret Code corresponding to that of the transmitter is connected, whereby in the opposite case the transmitter is not switched off.

In connection with Fig. 2 and 3 the details of the Operation of the transmitter and the receiver described, the parts of which are shown schematically in Fig.1.

A clock generator 1 continuously generates a pulse train, and errors 2 and 3 generate the input addresses of the programmable memory PROM 4, which has a capacity of 256 bits, for example, which is converted into 32 χ 8 bits are structured, and the via the parallel / series shift register P / S 5 controlled by the counter 2 the row-wise arrangement of the bits that come in parallel from the memory PSOM 4 allows.

The output from the shift register P / S 5 is given to the modulator 7, in which the operation begins as a carrier, where one among K of N frequencies by the selection logic

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and then by dialing, he is selected to be 9 on this Way the digital part of the transmitter and the transfer function to complete.

The modulation is PM modulation and it is through it characterized in that if the modulation signal is a logic "zero", this goes through Fi, and then. if this signal corresponds to a logic "one", this goes through f1i + DFi. The frequency division multiplexing stage 10, the Amplifier 11 and antenna 12 complete the analog part of the transmitter.

Thus, the first functional feature of the transmitter is described ", i.e. the function of transmission through the use of several frequency bands, one being codified Message by the only recipient pre-arranged for the actuation of its end actuators, can only be recorded by recording on one of the tapes, namely the complete message and only this Message to the exclusion of any other message or disturbance.

In the following, the second feature of the transmitter is now described, the transmitter due to the special Circuit sending out either the coded message

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for actuating the previously arranged receiver or another message that is either analog or digital independently by the single recipient can be recorded or recorded, which is in an open state by the first control message to receive the following message and this switches off any other recipient who is through the first message has not been turned on and is not in a position to receive any another message is located.

This function is carried out by means of the circuit comprising the elements 4a, 20, 20a, 20b, 20n.

The switch 3 «1-3 · 2 is moved from its position a to its Position b is switched, which means that the permanently pre-programmed programmable memory PEOM 4 is switched off from the circuit and instead the changeable program memory RAM 4-a is switched on.

The changeable program memory RAM 4a is at any time programmed by means of the external elements, which are shown as examples without limitation by 20a, 20b, 2On which may consist of keypads, programmed tapes or other data generators that

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can be entered into the programmable memory RAM 4a can, whereby the memory is read out at the moment of the transfer and the corresponding group of previously arranged messages are transmitted.

With this arrangement, the sender can activate each receiver and then transmit each message.

The third feature of the transmitter is described below. It automatically allows the identification function of his Recipient or its recipients by means of data analysis through a direct connection with the same recipient or to the recipients. Reference is also made to Pig.2 for this purpose. The memory S / R 13 becomes mandatory actuated by the switch 13a, which is connected between the battery b and the memory 13. The memory 13 allows the switching of the battery source b on the second memory S / R 15 and from there to that remaining circuit through switch 13a.

The actuation by means of the switch 13a can be carried out together with the removal of the receiver from its mechanical housing, including on 3? ig.1 and the associated Description is referenced.

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From that moment on, the transmitter is connected and ready to be operated by any of the external elements 14 corresponding to ^{the elements 10 of the J 1 Ig.1.}

Actuation of any of the elements 14 does so Intervention of the memory 15 and accordingly the feed line to the logic and analog circuits of the transmitter, which his Transmission "begins, either immediately or after a delay determined by the timer circuit 16, and although in accordance with the closed or open position of the switch 16a.

At this point, the address control counter 5 sends successively to the programmed memory PROM 4 chains of readout pulses that are suitable for the entire contents of the programmed memory PROM 4. The pattern of the programmed memory corresponds to one page with 32 lines with 8 characters each, with the beginning and the The end of each line is formed by a start and stop code.

When the reading of a line is finished, the reading of the next line etc. begins over the entire period, when the transmitter is activated.

The start signal of each line (address) becomes both the

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Memory PROM 4 · as well as to the interrogation circuit 17 delivered.

The output signals from the memory PROM 4 are present its eight outputs and they are distributed as described below. The first seven characters of each Lines are used to encode the carrier and are transmitted wirelessly or otherwise while the last character of each line is given to the interrogation circuit.

Thus, for each line or address, there are seven outwardly transmitted characters and one character which is inside of the system is being used.

The interrogation circuit 17 thus picks up the line start character and a single character for each line (the last characters of each line) and uses the characters as described below:

a) it sends the line start signal to the coincidence counter 19 'so that it starts the coincident reads from the first line,

b) it sends the character recorded from each line to the bit comparator 18,

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c) it sends the address control to the memory PEOM 121 of FIG. 3 by the direct connection 17b of FIG. 2 and 122b of FIG.

It should be noted that the code associated with the last character of each line that is to be kept secret is never should go through the transmitter since it stops at the bit comparator 18.

As mentioned above, the interrogation circuit therefore sends the read address signal to the memory PEOM 121 3 in order to read out the memory PEOM 121 synchronously with the reading out of the memory PEOM 4- of FIG to cause. The memory PEOM 121 sends its contents line by line, which it passes through at the last character the connection 121c der.Fig.3 has taken up by the direct connection 121b of FIGS. 3 and 18b of FIG.

The last character of each line must match the identical character of the last line of the memory PEOM 4 of FIG to match.

This correspondence is achieved by means of the bit comparator of FIG. If there is a match on the gj.; A-

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Chen line occurs, the comparator 18 sends a Count pulse from the coincidence counter 19 for one subsequent use is given as described later.

The mechanisms by which the readout is achieved is shown in Figure 3. The address signal everyone Line is given to the interrogation detector 122, which gives the start signal to the detector 117 through the gate OR 116. The detector 117 gives the start signal to the address generator 119, which starts reading out the memory 121 with the line that coincides with the line presented by the transmitter on its own Memory PROM 4 of Fig.2 must be read. The memory PROM 121 then transmits directly over the links 121b and 18b the last character of each line to the comparator 18 and thus successively for all lines controlled synchronously with the transmitter.

Reference is made again to FIG. Be it notes that for the bit comparator 18 of one side the last character each in the memory PROM 4 is consecutive line read from the first line to the last line and the last character from the other side that read in the memory PROM 121 of the receiver

Lines arrive in identical order.

If the character coming from the memory PROM 4 · starts with the characters coming from the memory PROM 121 coincide, a coincidence is achieved, which is a count signal the terminal 18c which is connected to the counter 19 is generated.

As mentioned above, the coincidence counter 19 is in order to carry out the count always when starting from the first line read out from the PROM 4 memory intended.

Thus, if the codes of the two memories PROM are identical, the lines advance synchronously, for each Line a coincidence signal is present at the ends of the terminals 18c, and therefore the coincidence counter 19 starts counting from the first line as many matches as there are words and in the same order, in which the reading is carried out in the memory PROM 4-.

The coincidence counter 19 is provided in such a way that it sends a signal to the output 19a for all rows of matches sends out according to the number of words for which there must be a match. Thus, in the Pail of the described embodiment without a loading

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this is limited to a number of eight words or lines contained in the memories PROM 4 · and PROM 121 the coincidence counter 19 on the terminal 19a a signal send out if eight matches starting with the first address and ending with the last address.

The signal transmitted via the terminal 19a is used to switch the memory 13 so that the transmitter is no longer supplied via the line 13a, which ends the transmission of signals.

From the above description it follows that the resetting of the memory 13 only by the onset of the a receiver can be reached in the mechanical housing, the memory PROM 121 of which is identical to the memory PROM 4 of the transmitter has been programmed.

This fact characterizes the invention as it allows the device in question to be used in a manner where maximum certainty is required that the correct answer to that of the Message sent to the sender can only be given by the owner of the same recipient, i.e. by means of the Receiver whose memory PROM 121 is identical to the

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Memory PROM 4- is programmed while all others Receivers that are not programmed identically to the receiver are not able to send the sent out stop ai messages so that the by means of the Messages searched for results are reliably protected.

The following is again based on Pig.3 Receiver part described in detail.

The receiver for which in the description of a radio device to receive signals from a broadcast transmitter is assumed, is basically in its described form of the embodiment in the high-frequency part adopted as a transpose receiver circuit.

Thus, its basic elements are an antenna that is connected to a circuit that responds to the frequencies is coordinated within which the device is to be operated, a local oscillator that is suitable to superimpose a locally generated frequency on the input frequency and a mixer that is able to to select the beat resulting from the superposition of the two frequencies, whereby the resultant is the subsequent

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tunes the following elements of the circuit according to the frequency for which they are intended.

Of course, if the frequency of the local oscillator changes, while the frequency of the following Elements remains unchanged, only the tuning of the facility will change based on the frequency that is carried out by the antenna is picked up.

If the receiver is tuned to two predetermined transmission frequencies, the frequency of the local 3 first switched to fi and then to fk.

Since the recipient must be ready to receive his switch-on message to be received both on one frequency channel and on another frequency channel, and in terms of the fact that the station it is tuned to alternates first on one channel and then on the other Channel sends to the recipient's vote securely in accordance with the moment To have transmitted tuning frequency, the switching of the tuning frequency of the receiver is referred to asynchronously at which the changeover times of the transmitter are carried out, and in addition, the duration of the vote of the recipient

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maintained on each channel for a period greater than the duration of the transmission of a full Message by the sender himself.

This feature enables alternate recording on two or more channels when the Transmission takes place in order to enable the recording with a high degree of security even in the event of interference for the transmission, which affect some of the channels, However, they may not act on all channels at the same time.

Those recorded at 101, reinforced at 102 and 103 mixed signals are passed to the crystal filter 104-, for example at 10.7 M Hz. and they are further amplified at 105 and finally given to the discriminator 106.

At this point the analog part relates to the admission procedure for the message ended, with the recording process alternating on one or more channels is executed for reliability.

The link between the analog part of the recorded message and the one using the message itself logical part goes through the switch 107 »its function

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is described below ".

First "switch 107 is idle and connects the discriminator 106 with the bit reconstructor 109 to enable the incoming message to be processed using of the logic circuit and memory 121 can be identified.

Once the message has been identified and accepted as a separate message, the actuation of the results Memory 123.

Starting from this point in time, two facts may arise that relate to the Uses of the message include:

a) The simple actuation of the relay "E" for a signal or remote control,

b) the use of the message as the first of further logic and / or analog messages.

In the first case, the receiver terminates its function in the form described and illustrated, while in the second case the user closes the breaker 123c beforehand.

With this activity the user initiates the II ° time of the activity of the recipient, i.e. for the activation of the Memory 123 are followed by two activities:

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The first action on the selection logic 114- on the channel from which switches at this time, receives the message \ the second type for the switch 107 so that the coming of the discriminator 106 messages to the logic and / or analog user for further treatment and use to be directed.

The use of the message means, firstly, a check as to whether the recorded message is the only message that can concern the recipient, who in turn is intended to receive only one or more encoded messages with the exclusivity of any other message. Second, the message, after being checked, can only be used to excite the end actuator E by switching the switch Ί? serve, or it can be used to be reproduced in a digital electro-optical display, or also to be stored simultaneously for subsequent use at a later point in time, or the message can only serve to switch on the receiver so that the receiver is kept ready for receiving a second message, which can be a digital and / or analog message.

The special circuit allows unusual flexibility

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did the use so that within the by the embodiment different circuit diagrams are provided without limitation who can accept the device at the moment of its practical use.

The following describes the operation of the logic part of the receiver that is used to select the message and is used to perform the following operations using the message itself.

The digital part begins with the bit reconstructor 109, whose function is that of reconstruction in a secure manner digital form of the signals picked up by 101, 102, 105, 104, 105, 106 and 107, so as to allow their presence for to ensure the following levels of use in a form analogous to the transferred form.

The signals supplied in sequence by the bit reconstructor 109 are used in the subsequent word synchronous circuit 110, whose functions are as follows:

1. he determines the word "start",

2. It synchronizes depending on the times of the Start clock 112 through 110a, whose typical frequency is originally close to that of the transmitter,

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3 it switches the series / parallel register 111 so that the word can be entered into it that has been recorded in the sequence and offers this in parallel at the output,
4. It causes the address generator 119 of the memory PROM 121 to advance through C.

The series / parallel shift register 111 sends the signals via the circuit OR 116 after the word has been input via A, the function of which is described later, which initially only takes into account as a transmission element is, to the "PHRASE" start detector 117, its function the resetting of the address generator 119 for each coming from the memory PROM 121 is detected Kirase is about to start from the beginning of the phrase itself.

The memory PROM 121 is provided for understanding a particular message or several messages, from the part is related to what can be picked up by the free radio waves emitted by the transmitter, while the other part, namely the secret part, for comparing the identity of the PROM memory of the sender and of the PROM memory of the receiver is used as described above.

Therefore, the recorded and processed message is transferred to the

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The output from the shift register 111 is passed on to the byte comparator 118 via B.

The bytes comparator 118 functions as a comparator for the words that have the same address when they Words in parallel through B from the shift register 111 and also when the words through 121a from the memory PROM 121 come.

Whenever the two compared messages match, which indicates that the recorded message corresponds to that provided in the memory PROM 121 is generated the byte comparator 128 sends a signal via 118a which is suitable for a step in the coincidence counter 120 to cause.

The coincidence counter 120 is provided to output an activation signal to the memory 123 only when counting the predetermined number of steps has been reached. Accordingly, when the counter is one step for carries out every match of the word, restarting at the beginning of a phrase via the connection 11 ° / b it is clear that it is necessary for the counter to be able to count the words complete that the words agree with the two fundamental requirements, namely identity for the

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Word synchronicity and for the code included in the word with
the contents of the memory PROM 121 is what
a correct message means excluding any other different message. This fact enables the absolute choice of the system according to the invention.

The inclusion of the correct message and only this message generates a control signal through the counter 120 which is suitable for activating the memory circuit 123. Activation of circuit 123 is the last
Activity that represents the current level of use of the message.

The output signal from the memory 123 corresponds to
"On" position of the recipient, which means that the
Receiver has recorded a complete message over one of the frequency channels and he remains to be recorded
other messages switched on.

This is where the receiver is used
on the intended routes, namely:

1 ° - The frequency selector is via connection 123d switched off so as to remain tuned to the only channel on which the complete message was recorded has been, and about which other news or

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confirmation of the first message can be recorded.

2 - Via the connection 123b, the relay E and the switch F, which is operated for further uses, namely for electro-acoustic level, for remote control or other purposes.

3 ° - The switch 107 can be operated via the connection 123c and the switch 23, so that the one coming from 106 To derive message to logic and / or analog user 108 via 107b.

The identification function characterizing the existing system allows the device to be used in a secure facility when making an identification required for the only receiver previously connected to the transmitter.

The operation of the device concerned, which is used for the transmission of an interrogation code, follows an analog and / or digital message.

In this case the transmitter works as follows: At the beginning the contacts 13a and 13 are closed the start of operation of the transmitter and the exclusion or non-exclusion of the delay 16 by means of the Switch 16a.

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The transmission "begins by! Punk from the broadcast in the Memory PROM 4 contained coded message to switch on the remote recipient.

After a determined by the delay device 5a
The time, which corresponds to the time for emitting a defined number of time steps of the coded signal, is switched on by the only receiver or receivers for whom the message is intended, the delay device 5a sending out a control signal which can actuate the following:

First, the switch that controls the modulator 7 coming from the line 5/1 from the parallel / series shift register 5 to the line 6/1 T 2/3 coming from the memory RAM 4-; at the same time he actuates the generator of the analog and / or logic signals 20 via the line 5c, whereby the actuation carried out, for example, without restriction
then by means of the optical signal 5d or others
Signals is specified.

Starting from this moment, the modulator only receives the signals coming from the generator 20, the
in turn by the external elements 20a, 20b, 20n
is controlled, for example, without restriction
from analog-digital pre-recordings or micro-

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phones or control panels or other devices can, whereby the messages originating from these elements are transmitted, and only through the Recipients or the recipients are included, previously transmitted by means of the at the beginning of the transmission Codes have been switched on.

The transmitter is switched off manually using switch 13t>.

The receiver then works as follows: First, switch D is moved from D1 to D2, so the memory 123 'if it is controlled by the recording of the exact transmitted code, which is with his coincides with the own code contained in the memory PROM 121, instead of the actuation of only the end operator E or other similar element becomes permeable to the asynchronous selection logic circuit 114 to operate, which in this way keeps the receiver ready for recording until it is switched off by the memory 123 will.

In addition to blocking the selector 114, the memory 123 also causes the switch 107 to be switched, so that the Signals coming from the discriminator 106 are given to the logic and / or analog user 108 who

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nale to the logic circuits 127 and 124, the Processing of analog signals or digital signals are suitable.

Starting from this moment, the analog messages are passed through repeater 128 to the final transmitters
128a-b .... n, which can for example consist of acoustic transmitters, recording devices or other devices without limitation. The digital signals are passed through the decoder 125 to the end transmitters, which may consist of, for example, without limitation, illuminated digital displays, recorders, readers or other devices.

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Claims (6)

Claims 1.) Device for remote control and remote transmission of a particular information using hertzian radio waves that is useful in establishing the connection between two elements to effect, one of which is a transmitter and the other is a receiver, or between one or more Senders and one or more receivers in a highly selective way, so that the connection and the relevant Transfer of information only between prepared elements with the exclusion any other unprepared elements can occur, both for the single couple Transmitter-receiver as well as for selected groups of several transmitters with several receivers. 2. Device for remote control and remote transmission of information, characterized in that the "connection of two prepared elements over a distance that simultaneously and alternately several physical Paths that are characterized by different frequency bands are used to complete the connection automatically through the physical path to enable the moment of connection itself the most 9098 4 4/0782 preferred is so as to determine the level of reliability for multiply the operation of the connection itself. 3 · Device for remote control and remote transmission an information device, characterized in that that this consists mainly of two elements, namely a transmitter and a receiver, which are in the Are able to interrogate each other, namely that the receiver interrogates its own transmitter and the The transmitter queries its own receiver, the query of the receiver being used by the transmitter allowed the establishment in punctures of the security, where it is required that only the prepared receiver is able to see the activity of the sender through Control blocking of the transmission after the transmitter has been operated in another way. 4. Device for remote control and remote transmission of a Information device according to claims 1 to 3, characterized in that during the transmission of the Remote control and during the long-distance transmission of the information necessary for the receiver or receivers is intended, exclusively the start of the transmission that can be caused by elements that are connected to the transmitter on electrical or 109844/0762 other ways are connected, with the subsequent switching off of the transmitter itself only by a direct one Connection of the receiver with the transmitter can occur exclusively to the physical presence of the with the receiver switched on with the exclusion of any other receiver or external ■ Mediation. 5. Device for remote control and remote transmission of information according to one of the preceding claims 1 to 4, characterized by the use for the double interrogation system of a sender-receiver and Receiver-transmitter, any number of alphanumeric characters, some of which are used to switch on of the receiver is used by the transmitter, while a second part is used to turn off the transmitter is used by the recipient in order to achieve a high level of security with regard to the basic fact that coded signals of the receiver in the border are intercepted during activation and by recording the physical radio wave and then transmitting it through automatically operated, Specialized bodies can be decoded without in any way thereby impairing the activities of the recipient to prevent being encoded 80Ö8U / 0782 Signals that are capable of putting the transmitter out of operation remain unknown, and thus in some Case to allow the maximum security of the processing of the requested information fact that is provided by the executed or not executed shutdown of the transmitter, which is only possible through the knowledge of the secret part of the code, which is only contained in the prepared recipient. 6. Device for remote control and remote transmission of information, characterized in that the Performing transmissions with a high degree of choice to the selected groups of recipients is possible that only to record the message below. Excluding others from large numbers are suitable. 909844/0762