FR2653921A1 - SECURITY SIGNALING SYSTEM, IN PARTICULAR FOR GUARANTEEING THE SECURITY OF A FUNCTIONAL VEHICLE. - Google Patents

Abstract

The invention relates to a safety signaling system comprising several receivers (RS-1, RS-2, RS-3), each placed at a respective site, a respective group of transmitters (T1-1, ... T1-). 8; T2-1, ... T2-8; T3-1, ... T3-8) associated with each receiver and capable of transmitting information to each receiver, the information transmitted by the transmitters of each group containing a respective access code which can only be recognized by the associated receiver, and at least one mobile transmitter (P1, P2) serving to transmit information containing a common access code which can be recognized by any one receivers. Mobile transmitters are associated with vehicles for transporting funds between banks, for example.

Description

This invention relates to signaling systems

  security and, more specifically, similar systems

  both mobile transmitters placed for example in vehicles of

  security, such as cash transport vans.

  Some banks have autonomous security signaling systems comprising several radio transmitters which

  can be activated by staff in an emergency to trans-

  put a signal at a local reception desk located in the same bank. The programs sent by these radio transmitters contain a unique access code, which can only be recognized by the associated reception station. As a result, the receiving station of a bank is prevented from reacting to issues from other banks,

  which could otherwise lead to false alarms.

  These safety signaling systems are not able to recognize radio emissions from mobile transmitters located in safety vehicles, for example

  cash transport vans. Thus, in the case of a situa-

  tion, for example an attack on a vehicle near a bank, there may be a delay

  considerable before help can be given.

  According to the invention, a signaling system is proposed.

  security station comprising several receivers, each arranged at a respective site, a respective group of transmitters associated with

  each receiver and capable of transmitting information to

  nation of each receiver, the information transmitted by the transmitters of each group containing a respective access code which can only be recognized by the associated receiver, and at least one mobile transmitter intended to transmit information containing an access code

  common that can be recognized by any of the receivers.

  Preferably, the mobile transmitters are associated with one or more security vehicles, for example cash transport vans. The mobile transmitter can be a fixed installation located inside the security vehicle or it can

  be carried by a security officer traveling in the vehicle.

  Receivers, transmitters of each group and

  Mobile transmitters can operate on a radio frequency.

  Each receiver can have a first means of recognition

  birth making it possible to recognize the respective access code contained in the information transmitted from any of the

  transmitters associated with the receiver, and a second means of recognizing

  birth to recognize the common access code contained

  in the information transmitted by any of the mobile transmitters.

  According to another aspect of the invention, there is provided a

  receiver suitable for use in a signaling system

  security, which comprises a reception circuit for receiving a radio broadcast, a first recognition means for recognizing a first access code in a received radio broadcast, a second recognition means for recognizing a second radio code access to the received radio broadcast, the first and second access codes being different, and means for producing a respective output signal in response to recognition of the first and second access codes respectively

  by the first and second means of recognition.

  The following description, intended as an illustration of

  the invention aims to give a better understanding of its characteristics and advantages; it is based on the appended drawings, among which: - Figure I is a block diagram showing several safety signaling installations; - Figure 2 is a block diagram showing a transmitter belonging to the system; - Figure 3 is a diagram showing blocks of digital data forming signals transmitted in the system; and - Figure 4 is a block diagram showing a

system receiving station.

  The security signaling system shown in FIG. I comprises three security signaling installations 1, 2 and 3, which are each placed in a different place (in this case, in a respective bank), and two mobile transmitters, which are each associated with a respective security vehicle, for example a cash transport van. These transmitters are normally (although not necessary) carried by

  security guards traveling in the vehicle.

  You have to understand that, while this embodiment,

  given as an example, has three signaling installations

  security system and two mobile transmission units, the system may have more or fewer of these components. Each installation 1, 2 or 3 includes a respective group of Local radio transmitters T1-1, T1-2, ... T1-8 (for installation 1) T2-1, T2-2, ... T2 -8 (for installation 2) and T3-1, T3-2, ... T3-8 (for installation 3), as well as

  respective radio reception stations RS-1, RS-2 and RS-3.

  The transmitters in each group can be manually activated to send an alarm signal to the associated receiver in the event of an emergency. For this purpose, the transmitters can be carried by the staff or placed in strategic positions in the bank, in the offices of the cashiers for example. Alternatively, or alternatively, the transmitters in each group can be activated in response to a detection signal produced by a security sensor used, for example, to detect an illegitimate entry into a security zone. These sensors can be in the form of infrared detectors, or that of intrusion sensors having

  pressure-sensitive contact pads which are placed stra-

  tegically, in the vicinity of a window or a door for example.

  FIG. 2 represents, by simple example, a suitable radio transmitter (for example T1-1) which can be activated manually by closing a switch 5. The transmitter has an input circuit 6 which is connected to the switch by two lines 7 and 8. When the switch 5 is closed, the input circuit 6 produces an appropriate response signal (indicating that an alert has been triggered), which signal is then coded by a coding circuit and synchronization 9 and transmitted to a radio transmitter 10 for transmission, by radio, to the associated receiving station (RS-1 in this case), via a transmitting antenna 11. The transmitter must normally have a design compact, non-concealable and must have battery power 12. Power supply connections are not shown on

the drawings.

  The signals emitted by the transmitters are in digital form.

  and Figure 3 shows a format that can take

digital signals transmitted.

  As can be seen in FIG. 3, each transmitted signal comprises a first data block B1 (of length 8 bits),

  called access code, which unambiguously identifies the facility

  respective relationship to which the issuer belongs. Consequently, each installation is assigned its own unique access code. The next part of the transmitted signal comprises a second data block B2, in the form of an area code (comprising 4 bits), which identifies the area (for example a coin) of the bank inside which the transmitter is placed. The data block B3 (also comprising 4 bits) is an emitter code, which distinguishes the emitter responsible for the emission

  vis-à-vis all the other transmitters of the same installation.

  The final data block B4 (also having 4 bits) represents the information; in this case, it is the state of the

  switch 5 (ie "open" or "closed").

  As already indicated, the transmitters of each installation are all designed to transmit the same respective access code, which effectively identifies the installation unambiguously and distinguishes it from all other installations. Likewise, the reception station of each installation is designed to react only to the correct access code (produced by the transmitters of that installation only) and it does not respond to emissions (coming

  other installations) which contain different access codes

  rents. In this way, each installation is autonomous, and

  any interference between different installations is prevented.

  FIG. 4 represents a reception station (for example RS-1), in the form of a block diagram. It has a receiving antenna 20 connected to a receiving circuit 22 used to receive and appropriately process digital signals coming from any of the transmitters (including those of other installations) which are within its limits. scope. The received signals are sent to a demodulation circuit 24, which demodulates the signals having the correct modulation format, the foreign signals, which have an incorrect modulation format, being rejected. The demodulated signals are then sent to a first recognition circuit 26, which compares the access code contained in the received signals (in the data block B1) with a preprogrammed access code (i.e. correct access code for this installation) stored in its memory. If the recognition circuit recognizes the access code, the signals received are sent to a data extraction circuit 28 which extracts the data block B4 and triggers an appropriate reaction. For example, if the data block B4 indicates that the switch 5 is closed (the alarm situation), the data extraction circuit produces an audible sound, or any other

  form of warning, or emits an alarm signal intended for

  tion of a central signal control station.

  The mobile transmitters P1 and P2 represented in FIG. 1 could be programmed to transmit the access code relating to one, selected, of the sites (site 1 for example), which would be recognized by the respective receiving station (RS -1). However, this arrangement is not practical if, as is normally the case, the security vehicles, with which the transmitters P1 and P2 are associated, are called upon to move from one site to another, since the code d should be changed to the one that is

  appropriate for each new site visited.

  To reduce the incidence of this problem, the mobile transmitters are pre-programmed to transmit a common access code, which differs from the access codes for which the first recognition circuits 26 (contained in the radio stations

  reception-RS-1, RS-2 and RS-3) have been programmed.

  These reception stations then contain a second recognition unit 30, which is also connected to the output of the demodulation circuit 24, but which is preprogrammed to react only to the common access code contained in the transmissions of the mobile transmitters P1 and P2. As before, if the second recognition circuit 30 recognizes the common access code, the signals received are transmitted to another data extraction circuit 32, which triggers an appropriate reaction. The first and second recognition units 26 and 30 and their respective data extraction circuits 28 and 32 could be combined into a common circuit, which produces a common output signal containing an appropriate data flag indicating whether the

  common access code has been recognized or not.

  The system described ensures that a transmission from any mobile transmitter will be recognized by all of the receiving stations within range, including, most importantly, the stations closest to the mobile transmitters. . Thus, the security guard who makes a delivery to a bank has the possibility to request assistance

  immediately, wherever it is located.

  Of course, those skilled in the art will be able to imagine,

  from the device whose description has just been given to

  title merely illustrative and not limiting, various

  variants and modifications not departing from the scope of the invention.

Claims (7)

  1. Safety signaling system, characterized by several receivers (RS-1, RS-2 and RS-3), each placed at a respective site, a respective group of transmitters (T1-1, ... T1-8 , T2-1,   T2-8; T3-1, ... T3-8) associated with each receiver and suscep-   tables to transmit information to each receiver, the information transmitted by the transmitters of each group containing a respective access code (B1) which can only be recognized by the associated receiver, and at least one mobile transmitter ( P1, P2) used to transmit information containing a common access code which can   be recognized by any of the receivers.   2. Safety signaling system as claimed   cation 1, characterized in that the receivers (RS-1, RS-2, RS-3), The transmitters (T1-1, ... T1-8; T2-1, ... T2-8; T3- 1, ... T3-8) of each group and The mobile transmitter, or each mobile transmitter, (P1,   P2) operate at a radio frequency.   3. Safety signaling system as claimed   cation 1 or 2, characterized in that each transmitter (RS-1, RS-2, RS-3) has a first recognition means (26) used to   recognize the respective access code (B1) contained in the information   tion emitted by any of the transmitters (T1-1, ... T1-8; T2-1, ... T28; T3-1, ... T3-8) associated with the receiver (RS-1, RS -2, RS-3), and a second recognition means (30) used to recognize the common access code contained in the information transmitted   by any of the mobile transmitters (P1, P2).   4. Safety signaling system as claimed   cation 3, characterized in that the first and second recognition means (26, 30) constitute respective parts of a same recognition circuit.   5. Safety signaling system as claimed   cation 4, characterized in that the recognition circuit is in   able to produce a single output signal containing information   which distinguishes the recognition signals produced by   first and second recognition means (26, 30).   6. Safety signaling system according to one   any one of claims I to 5, characterized in that The   mobile transmitters (P1, P2) are associated with one or more vehicles   security locks, such as cash vehicles.   7. Radio receiver designed to be used in a security signaling system, characterized in that it comprises a reception circuit intended to receive a transmission   radio, a first recognition means (26) used to recognize   a first access code in a received radio broadcast is born, a second recognition means (30) used to recognize a second access code in the received radio broadcast, the first and second access codes being different, and a means used to   generate a respective output signal in response to recognizing it   first and second access codes respectively by the   first and second recognition means (26, 30).