SK282912B6 - Electronic security system - Google Patents

Abstract

In an electronic security system, preferably for protecting residences, the protected space is provided with a main frame connected to a device for actuating the main frame and to at least one sensor. The main frame is further connected by a cable television cable to a central console. The main frame has a code recognition processor (1) that generates at least one high frequency when it is not switched off and the device for actuating the main frame is a device (4) for reading cards with integrated chip.

Description

Technical field

The invention relates to an electronic security system, in particular for the protection of apartments whose protected space is equipped with a control panel to which the control panel control device and at least one sensor are connected and which is connected to a central protection panel via a cable television transmission line.

BACKGROUND OF THE INVENTION

Security systems for protecting groups of protected areas, for example apartments, against theft, eventually against fire, gas leakage and the like are known. Known security systems of this kind consist of elements located within the protected object, connection elements and a central security desk. Inside the protected area there is a control panel to which the sensors and the control panel are connected. This also serves to prove the eligibility of access to the protected area or to set new conditions of access to it. A backup power supply and possibly a siren can be connected to the control panel.

The sensors are basically loops with two-state output - on / off. They are either active - requiring power, such as infrared sensors or sensors detecting changes in electromagnetic or acoustic waves, or passive - without power, such as magnetic contacts and microswitches. Binary (binary) information is routed from the sensor to the control panel by cable or radio transmission. The task of the control panel is to evaluate the status of the sensors and the information coming from the control device and, after the evaluation, to send alarm or other information to the central protection desk or to switch on the siren.

The control panel receives the identification information from the entering person by means of a mechanical or electronic key that the person enters into the device or by means of a code keypad controlled by that person. The code keypad can also serve as a means to set new access conditions to the protected space.

When a person enters a protected area, for example, a magnetic sensor triggers a timer in the control panel and the entering person must shut down the system within a certain time by using his key or keypad, otherwise a protected area attack is signaled. A person is usually alerted by a sound or light signal that the timeout is coming to an end.

In known alarm systems, the information from the home control panel to the central protection desk is routed over its own dedicated telephone line, either in the form of binary information or a conventional telephone line, either in the form of binary information in the frequency band above the frequency of telephone calls or form in the speech zone.

Security systems are known in which the transmission of information from the home exchange to the central protection desk takes place via cable television lines. In these systems, the standard central offices in the individual protected dwellings are periodically contacted by the central protection desk and transmit information about their status to the counter with a periodicity of approximately 6 s.

French patent application no. 78 01103 is a known alarm device that transmits alarm signals from several alarm transmitters to one or more receivers. In this device, various high-frequency signals from different transmitters are routed through one coaxial network in the form of a frequency spectrum. One solution of this device is designed so that the receiver detects a normal state when a modulated carrier frequency is present, an alarm condition when only the carrier frequency is present and if any signal is missing, the receiver detects a fault.

The disadvantage of this and other known security systems using cable television transmission is their easy attack, since the protected object between the two contacts (polling) on the central security desk is not monitored, allowing the emulator to be connected.

From various publications, for example from German published application no. No. 42 41 526, security systems are known in which smart cards are used as keys.

In general, if the security system is to be deployed in dwellings, blocks of flats, or in urban areas, the system must meet the following basic requirements:

- its technical level must comply with the standards in force, - its control must be accessible to persons over 8 years of age,

- it must be secured against misuse of access rights,

- it must be acceptable, at least in basic form, to all social strata living in deployment areas,

- it must be sufficiently variable to provide different comfort according to the wishes and social status of the users.

A disadvantage of known security systems is that they do not meet at least one of the above requirements. Systems operated by mechanical or electronic key meet the condition of accessibility for persons over 8 years of age. Mechanical key systems do not meet the requirement of security against misuse of access rights if the key is lost, and electronic key systems are not affordable to the wider social strata.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a security system which fulfills all the above-mentioned conditions of mass deployment in a housing development.

Said task is solved by a security system, in particular for securing apartments whose protected space is equipped with a control panel to which the control panel control unit and at least one sensor are connected, and which is connected to a central protection desk via a cable television transmission line. The central part of this system is the identification processor, which generates at least one high frequency in addition to the zero state for the remote central alarm alarm and the chip processor is the element for controlling the identification processor.

In a preferred solution, the control panel is an identification processor which generates, in addition to the zero state, two different high frequencies, one of these high frequencies corresponding to an empty byte and the other to a legitimately occupied byte.

In the case where the device serves a large number of subscribers, it is preferable that a group decoder for decoding the frequency spectrum generated by the identification processors is connected between the group of identification processors and the central protection console.

Depending on the wishes and possibilities of individual users of the security system, the basic equipment of the home station may be supplemented by a source of electrical voltage, which enables the connection of active sensors or a code keypad to the identification processor.

SK 282912 Β6

In a preferred solution, the identification processors and the central protection console are provided with modems for two-way communication of the identification processors with the central protection console. The television connection may be connected to the protected object electrical output of water meter, gas meter, electricity meter and the like. In this solution, in addition to the security function, the system performs a full range of additional functions.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be further elucidated with reference to the drawings, in which:

Fig. 1 is a block diagram of a basic embodiment of a security system;

Fig. 2 is a block diagram of a system with group decoders; and FIG. 3 is a block diagram of a system equipped with modems, back-up sources, and active sensors.

DETAILED DESCRIPTION OF THE INVENTION

The basic solution of the security system consists of identification processors 1, which are connected to the housing connections 2 leading to the television receivers 3. Chip card readers 4 are connected to the identification processors 1, or they are directly part of them. A passive sensor 5 is also connected to the identification processor 1, which is located in the entrance door of the apartment. The home television connections 2 are connected to a cable TV broadcasting center 8 by means of a standard power supply and translation source 6 and cable distribution branches 7. At the point where the wiring branches 7 meet, a central protection console 9 is connected, which is a computer subsystem for monitoring and processing alarm and technical information from protected objects. A permanent service is foreseen for the central protection pulse 9.

The identification processor 1 is located behind the entrance door of the apartment inside the protected area. The passive sensor 5 is, for example, a magnetic switch located in the entrance door. The ID processor 1 transmits a frequency A signal to the cable TV network. The person entering the front door triggers the sensor 5 in the ID processor 1 when entering the front door. During the set time limit, the entering person has to insert his ID card into the smart card reader 4. If it does so and the chip card is identified as authorized, the identification processor 1 changes the transmitted frequency from A to B. If it does not, or the chip card is identified as unauthorized, the identification processor 1 stops transmitting. Zero frequency means alarm condition. Each system identification processor 1 has its own characteristic frequency A which corresponds to an empty byte and a characteristic frequency B that corresponds to an appropriately occupied byte. Frequency A, resp. B, transmitted by the individual identification processors 1 of the system, form a spectrum in the cable television distribution network which is decoded by the central protection console 9. Counter 9 registers the presence of individual components of the spectrum and evaluates the status of individual protected bytes, i. j. frequency A - be empty, frequency B - be legitimately occupied and frequency 0 - be attacked. In the latter case, the alarm is sounded and the exit unit is activated.

Obviously, the system can in principle work even if the identification processors transmit only a single frequency, such as A, that is common to cases of empty and legitimately occupied byte, with a reserved frequency of zero for the invaded byte.

In the simplest basic solution described above, the number of protected objects - bytes in the system - is limited by transmission capacities to 1024. To increase this number, the security system according to FIG. 2, which has group decoders 10 in the area of the power translation sources 6. Group decoders 10 transmit at natural frequencies. Their task is to analyze the frequency spectrum transmitted by the respective identification processors 1, whereby changing the frequency of each individual processor 1 between levels A, B and 0 results in a change in the frequency of the group decoder 10, which registers the central protection console 9. At the same time, the group decoder 10 interconnects the respective identification processor 1 with the central protection desk 9 and thus ensures that changes in the apartment are registered.

The existing description of the basic and extended solution of the security system mentioned the basic equipment of the protected building, ie. The apartment consists of an identification processor 1 with a chip card reader 4 and one passive reader 5 in the entrance door. This equipment is able to fulfill the basic security function of the apartment. However, the system allows additional devices connected to the identification processor 1 as a standard control panel to be installed in the individual apartments according to the user's wishes. This further enhances user comfort. The identification processors 1 may be connected to a voltage source 11, allowing the installation of active sensors 12 connected to the processor 1. In the event of a power failure, a backup current source 13 is installed. When it is exhausted, the identification processor 1 switches to the 0 state and the attack state 9 is identified by the central protection console. The source 11 further allows the connection of a code keypad 14. By means of the keypad 14, for example, the access conditions to the apartment may be changed.

The solutions of the invention described so far allow only one-way communication in the security system, from the identification processors 1 to the central protection console 9. A further stage of the security system for the users is a solution in which the central protection panel 9 is equipped with a modem 15 for two-way communication and the apartments are also equipped with modems 15 for two-way communication according to the user's choice. The complex security system of FIG. 3 allows the central protection panel 9 to recognize the type of failure to be reported and also to perform control interventions in the individual dwellings, for example to control temperature, humidity and the like. Two-way communication takes place at frequencies from 5 to 29 MHz.

The security system is characterized by a relatively high resistance to attack. When attempting to replace the missing frequency of a protected object by emulating it, it is sufficient to interrupt a slight interruption before the emulator is plugged in to register the central protection panel 9 with an attack and identify the infected object. When the mains voltage is switched off, its function is unaffected by the basic safety system solution. In the apartments where the security system is connected to the power supply 11, the standby power supply 13 starts up in the event of a power failure. After the back-up power supply 13 is exhausted, the frequency generation stops and the central protection desk 9 detects an unbalanced condition.

In the case of the key side, that is to say the smart card, the user reports a loss to the service at the central protection pulse 9, which sets the corresponding identification processor 1 to change according to the new key code. If the apartment has its own code keypad 14, the adjustment can be carried out by the user himself.

The security system according to the invention allows the individual objects to be protected, even adjacent to one another, to have completely different equipment - from basic to complete.

Claims (7)

PATENT CLAIMS 1. An electronic security system, in particular for securing apartments whose protected space is equipped with a control panel to which the control panel control unit and at least one sensor are connected, and which is connected to a central protection desk by means of a cable television transmission line, the control panel is an identification processor (1) generating at least one RF frequency in addition to the alarm zero condition on the central protection counter (9), and the chip processor (4) is an element for controlling the identification processor (1). Security device according to claim 1, characterized in that the control panel is an identification processor (1) for generating two high-frequency frequencies in addition to the alarm zero state. Security device according to claim 1, characterized in that a group of frequency spectrum generators (10) generated by the identification processors (1) are arranged between the group of identification processors (1) and the central protection console (9). Security device according to claim 3, characterized in that at least one active sensor (12) is connected to the identification processor (1). Security device according to claim 3, characterized in that a code keypad (14) is connected to the identification processor (1). Security device according to claim 3, characterized in that the identification processors (1) and the central protection desk (9) are equipped with modems (15) for the two-way communication of the identification processors (1) with the central protection desk (9). Security device according to claim 6, characterized in that the outputs of the housing measuring and control devices are connected to the identification processor (1).