JPH05143883A - Wireless security system - Google Patents

Abstract

PURPOSE:To prevent a serious accident due to a failure in receiving security information from being caused by setting the resending periods of plural wireless transmitters to mutually different periods or random-number periods. CONSTITUTION:Wireless transmitters 301, 302,...30n send security signals S1, S2,...Sn having mutually different periods T1, T2,...Tn. For example, a trespass sensor operates within a time t1. The wireless transmitter 301 sends the security signal S1 intermittently at the period T1. If a fire occurs in this state and a fire sensor operates at time t2, the wireless transmitter 302 sends the security signal S2 intermittently at the period T2. For the purpose, the periods T1 and T2 are set not in multiple relation and the probability that the security signals S1 and S2 overlap with each other is small, so a wireless receiver can receive both the signals S1 and S2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless security system using radio waves.

[0002]

2. Description of the Related Art As a wireless security system of this type, there is one disclosed in Japanese Patent Laid-Open No. 1-56893.

This type of system basically sends a security signal in the form of a radio wave in response to the operation of a security sensor such as an intrusion sensor or a fire sensor.
Alternatively, it consists of multiple wireless transmitters and a wireless receiver that receives this security signal and drives alarm devices in the house, but in recent years, the security signal received by the wireless receiver is used in the house by using the home telephone line. The information is transmitted to a remote security monitoring center through a telephone line, and necessary measures are taken based on the security information received by the security monitoring center.

[0004]

In this conventional system, since the transmission frequencies of a plurality of wireless transmitters are all the same and the security signal is continuously transmitted as shown in FIG. 7, one wireless transmitter is used. If another wireless transmitter is transmitting while the transmitter is transmitting, the receiving side cannot receive the security signal from this other wireless transmitter, and in the worst case, both wireless transmitters Occasionally, the security signal of becomes unreceivable.

For example, as shown in FIG. 7, when the wireless transmitter 30 ₁ of the intrusion sensor that has detected an external intruder is operating to generate the security signal S ₁ , a fire occurs and the wireless of the fire sensor is detected. Even if the transmitter 30 ₂ transmits a security signal (fire detection signal) S ₂ , this security signal S ₂ is not received and a situation occurs in which it is not reported to the monitoring center or the like. in this case,
At the surveillance center, measures are taken in accordance with the information of the received security signal S ₁ , and, for example, a staff member is dispatched to the house where the outside was invaded. I will know it and report it to the fire department, so the response to the fire will be delayed. Further, even if the resident of the house where the fire occurred presses the emergency button, the situation that the information that there is a person in the house is not transmitted occurs, which may lead to a serious accident.

The present invention has been made in order to solve this problem, in which the security signals transmitted simultaneously are 2
Even if it is above, it is possible to receive all of these,
An object of the present invention is to provide a wireless security system capable of improving reliability as compared with the conventional one.

[0007]

In order to achieve the above-mentioned object, the present invention provides a plurality of wireless transmitters connected to each security sensor and transmitting a security signal by the operation of the sensor, and the security. In a wireless security system including a wireless receiver that receives a tee signal and drives alarms,
Each wireless transmitter discontinuously transmits a security signal at a unique transmission cycle, and this transmission cycle is different for each wireless transmitter.

In claim 2, the transmission cycle of each wireless transmitter is a random number cycle. In claim 3, the wireless receiver is connected to the home telephone line. In claim 4, the wireless receiver is connected to the home bus.

[0009]

In the present invention, the transmission cycle of each wireless transmitter is unique and different for each wireless transmitter, or is set as a random number cycle, so there is little chance that a plurality of security signals are transmitted simultaneously, The wireless receiver can reliably receive a plurality of security signals.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 10 is a wireless receiver,
20 ₁ , 20 ₂ , 20 ₃ ... 20 _n are security sensors, 30 ₁ , 30 ₂ , 30 ₃ ... 30
_n is a wireless transmitter. The wireless receiver 10 includes a receiving antenna 11, a receiving unit 12, a control unit 13, and a reporting unit 1.
4, the security signal received by the reception antenna 11 is demodulated by the reception unit 12, decoded by the control unit 13 to generate a control signal, and the alarm unit 14 is driven. The reporting unit 14 is a display lamp, a buzzer, a synthetic voice generator, or the like. In addition, the security sensor 20
₁ , 20 ₂ , 20 ₁ ... 20 _n are intrusion sensors, fire sensors, gas leak sensors, emergency call transmitters, and the like.
Wireless transmitters 30 ₁ , 30 ₂ , 30 ₁ ... 3
0 _n are sensors 20 ₁ , 20 ₂ , 20 _1, ...
An input unit 21 for inputting a detection signal from 20 _n to perform signal processing, a control unit 22 for creating a predetermined format carrying security information from the input unit 21, a transmission antenna by modulating a signal from the control unit 22 The transmitter 23 is provided for sending to 24.

In this configuration, the wireless transmitter 30
₁, 30₂, 30₃... 30 _nAre different
Cycle T₁, T₂, T₃... T_nSecurity
Signal S₁, S₂, S₃... S_nTo send.

Now, for example, assuming that the sensor 20 ₁ is an intrusion sensor and the sensor 20 ₂ is a fire sensor, time t _{1
First, it} is assumed that the sensor 201 is activated. The wireless transmitter 30 ₁ intermittently transmits the security signal S ₁ at a cycle T _{1 as} shown in FIG. When in this state,
When the sensor 20 ₂ is activated at time t ₂ due to a fire, the wireless transmitter 30 ₂ causes the security signal S ₂
Is intermittently transmitted at a cycle T _{2 as} shown in FIG. Therefore, if the period T ₁ and the period T ₂ are selected so as not to have a multiple relationship, the probability that the security signals S ₁ and S ₂ overlap will be small, so that the wireless receiver 10 will be able to detect both signals S ₁ and S _2. Can be received together.

In this example, the wireless transmitters 30 ₁ , 3
The periods 0 ₂ , 30 ₃ ... 30 _n are set in advance to different fixed periods, but each wireless transmitter 3
_{0 1, 30 2, 30 3} ····· 30 n to have a random number table or the random number calculation unit to the control unit 22 of each wireless transmitter _{30 1, 30 2, 30 3} ····· 30 n As shown in FIG. 3, the transmission cycle may be a different cycle (random number cycle) according to this random number.

FIG. 4 shows an example to which the present invention is applied. The wireless receiver 10 is connected to the telephone line 1, the security signal received by the wireless receiver 10 is decoded by the control unit 13, and the telephone line 1 is connected. It is configured to be sent to the monitoring center 100 at a remote place through the.

In this configuration, as described above, the sensor 2
When 0 ₁ operates and then the sensor 20 ₂ operates, the monitoring center 100 receives the security signal S ₁ that is the first external intrusion information and the security signal S ₂ that is the fire information that follows the first external intrusion information. It is possible to quickly respond to a high fire occurrence.

FIG. 5 shows another application example of the present invention, in which the wireless receiver 10 is connected to the home bus of the home automation system, and the wireless receiver 1 is connected.
The security signal received by 0 is decoded by the control unit 13 and transmitted to the main controller 201 through the home bus 200.
The main controller 201 is a device to be operated based on the data received through the home bus 200, for example, a lighting control device (adapter) 51 of an illumination lamp 50 in a room where an outside intruder was present.
A flashing control command or the like is transmitted to the vehicle through the home bus 200.

FIG. 6 shows still another application example of the present invention, in which the wireless receiver 10 is provided with a transmission section 16, and, for example, the wireless transmitter 30 ₁ carries a blinking command of the illumination lamp 50. Format security signal S ₁
The wireless receiver 10 that has received the security signal S ₁ wirelessly transmits a control signal having the illumination lamp 50 as a transmission destination, and the adapter 51 sends this control signal to itself. Upon reception, the lighting 50 is controlled to blink.

[0019]

As described above, according to the present invention, by setting the transmission cycles of a plurality of wireless transmitters to be different from each other or using a random number cycle, it is practically possible to generate a plurality of security signals simultaneously. Because it disappears
The wireless receiver can reliably receive all generated security signals, and can prevent a situation in which security information with a high degree of urgency is missed and a major accident occurs, making it more reliable than before. Can be greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a time chart of a security signal in the above embodiment.

FIG. 3 is a time chart showing another example of the security signal in the above embodiment.

FIG. 4 is a block diagram showing an application target of the present invention.

FIG. 5 is a block diagram showing another application target of the present invention.

FIG. 6 is a block diagram showing still another application target of the present invention.

FIG. 7 is a time chart of security signals in the conventional wireless security system.

[Explanation of symbols]

1 telephone line 10 wireless receiver 20 ₁ to 20 _n security sensor 30 ₁ to 30 _n wireless transmitter 50 illuminating lamp 51 adapter 100 the monitoring center 200 home bus 201 main controller T ₁ through T _n outgoing period S ₁ to S _n Security signal

Claims (4)

[Claims] 1. A wireless security system comprising: a plurality of wireless transmitters connected to each security sensor to transmit a security signal by the operation of the sensor; and a wireless receiver that receives the security signals and drives alarm devices. In the system, the wireless security system is characterized in that each wireless transmitter intermittently emits a security signal in a unique transmission cycle, and this transmission cycle is different for each wireless transmitter. 2. A wireless security system comprising a plurality of wireless transmitters connected to each security sensor and transmitting a security signal by the operation of the sensor, and a wireless receiver which receives the security signals and drives alarm devices. In the wireless security system, the transmission cycle of each wireless transmitter is a random number cycle. 3. The wireless security system according to claim 1, wherein the wireless receiver is connected to a home telephone line. 4. The wireless security system according to claim 1, wherein the wireless receiver is connected to the home bus.