JP2012064028A - Wireless device in crime prevention system - Google Patents

Abstract

To provide a radio apparatus for a crime prevention system capable of using signals of two frequency bands together with a simple and inexpensive structure.
A reception device for a crime prevention system that receives a signal from a security sensor, capable of receiving a signal at a predetermined first frequency, and having a predetermined second frequency higher than the first frequency. An antenna 51a capable of receiving a signal, an LPF connected to the antenna 51a and passing only a signal having a frequency lower than the first frequency, an HPF connected to the antenna 51a and passing only a signal having a frequency higher than or equal to the second frequency, A first signal processing unit 53a that is connected to the LPF and performs reception processing of the first frequency signal, and a second signal processing unit 53b that is connected to the HPF and performs reception processing of the second frequency signal.
[Selection] Figure 4

Description

  The present invention relates to a wireless device for receiving a wireless signal in a security system.

  In general homes and the like, crime prevention systems that monitor for abnormalities such as the presence of intruders and fires, and notify the abnormality when an abnormality is detected have become widespread. In particular, in recent years, a wireless crime prevention system that transmits a signal wirelessly from a detection sensor, receives the transmitted signal by a receiving device, and performs abnormality notification or the like has been put into practical use.

  FIG. 7 is an explanatory diagram for explaining a configuration of a conventional wireless crime prevention system. As shown in FIG. 7, a wireless crime prevention system 100 includes a wireless opening / closing sensor 101 that detects the open / closed state of a door or window, a wireless fire sensor 102 that detects a fire, and a wireless security sensor that detects a human body. It is configured to include a human sensor 103, a wireless abnormality alarm lamp 104 for informing the outdoors of an abnormality, a repeater 105 that wirelessly relays signals transmitted from these sensors 101 to 103, and a receiving device 106. Yes. The receiving device 106 receives the signals transmitted from the sensors 101 to 103 via the repeater 105 or directly receives the signals, thereby monitoring the presence / absence of the abnormality and detecting the abnormality when detecting the abnormality. A warning signal is transmitted to the lamp 104 wirelessly to notify the abnormality, and if necessary, the abnormality occurrence is transferred to the security company by wire or wirelessly (for example, Patent Document 1 discloses an abnormality detection means. A security system for houses is disclosed).

  In such a wireless crime prevention system 100, since wireless transmission is performed at a short distance of about several meters to several tens of meters, the frequency band for wireless transmission is a 426 MHz band that is a specific low-power security wireless band. It was used. Here, in ARIB STD-30, which is a standard for this specific low-power security radio, carrier sense is not obliged when using radio waves having a frequency of 426.250 MHz or more and 426.8375 MHz or less. Carrier sense refers to sensing the reception power level of another radio wave having the same frequency as the carrier frequency in the radio transmission when performing radio transmission, and if this reception power level is equal to or higher than a predetermined threshold, radio transmission is performed. Means do not. Since it has been specified that such carrier sense is not necessary, in the conventional wireless crime prevention system, each of the sensors 101 to 103 performs wireless transmission without performing carrier sense.

Japanese Patent Laid-Open No. 2003-115085

  However, in the conventional wireless crime prevention system, only the 426 MHz band is used as the frequency band for wireless transmission, so the communication speed is as slow as 1,200 bps, for example, and the wireless signal transmitted from each sensor 101-103. It takes time to reach the receiving device 106, and in particular, it takes time to reach the receiving device 106 via the repeater 105.

  In addition, since each sensor 101 to 103 performs wireless transmission without performing carrier sense, when the number of sensors 101 to 103 is increased, the probability that signals collide due to wireless transmission being performed at the same timing. There is a possibility that a signal having a high radio wave intensity does not reach the repeater 105 or the receiving device 106 due to the increase.

  In order to solve such a problem, 1) a carrier sense function is added to each of the sensors 101 to 103, 2) a wireless transmission frequency band of each sensor has a higher communication speed than the 426 MHz band, and It may be possible to change to a frequency band (for example, 950 MHz band) where carrier sense is obligatory. However, in order to change the functions and frequency bands of the sensors 101 to 103 in this way, the existing sensors 101 to 103 with a large number of installations are replaced, or the new sensors 101 to 103 with many types are designed. It needs to be changed and is not realistic.

  Therefore, the inventor of the present application does not perform carrier sense in the 426 MHz band in the wireless transmission from each of the sensors 101 to 103, and on the other hand, the frequency band of the wireless transmission from the repeater 105 to the receiving device 106 We focused on solving the above problems by setting the 950 MHz band to 950 MHz. That is, when the 950 MHz band is used as described above, the communication speed from the repeater 105 to the receiving apparatus 106 can be improved to, for example, 9,600 bps, and wireless transmission from the repeater 105 or the receiving apparatus 106 is possible. Sometimes, by performing carrier sense, a radio signal can surely reach the receiving apparatus 106, and communication reliability can be improved. In particular, in this case, only the functions of the repeater 105 and the receiving device 106 need to be changed. Since the number and types of the repeater 105 and the receiving device 106 are small compared to the sensors 101 to 103, Easy to apply in reality.

  However, when the 426 MHz band and the 950 MHz band are used in combination, another problem may occur. That is, in the repeater 105 and the receiving device 106, in order to receive a radio signal in the 426 MHz band and receive a radio signal in the 950 MHz band, a plurality of antennas corresponding to these frequency bands are connected to one repeater. 105 and the receiving device 106 need to be provided respectively, and there is a problem that the repeater 105 and the receiving device 106 are increased in size and the manufacturing cost of the repeater 105 and the receiving device 106 is increased.

  The present invention has been made in view of the above, and an object of the present invention is to provide a wireless device for a crime prevention system that can use signals of two frequency bands in a simple and inexpensive structure.

  In order to solve the above-described problems and achieve the object, a wireless device for a security system according to claim 1 is a wireless device for a security system that receives a signal from a security sensor, and has a predetermined first. An antenna capable of receiving a signal at a frequency and capable of receiving a signal at a predetermined second frequency higher than the first frequency; and an antenna connected to the antenna and passing only a signal having the frequency equal to or lower than the first frequency. A first filter, a second filter connected to the antenna and passing only a signal of the second frequency or higher, and a first signal processing connected to the first filter and receiving the signal of the first frequency And a second signal processing unit connected to the second filter and performing reception processing of the signal of the second frequency.

  The wireless device for a security system according to claim 2 is the wireless device for the security system according to claim 1, wherein the antenna is a monopole antenna, and the length of the antenna is The length is in the vicinity of a quarter wavelength of the first frequency and the length in the vicinity of 5/8 wavelength of the second frequency.

  A wireless device for a crime prevention system according to claim 3 is the wireless device for a crime prevention system according to claim 1 or 2, wherein the first frequency is 426 MHz, and the second frequency is 950 MHz. is there.

  According to a fourth aspect of the present invention, there is provided a wireless device for a crime prevention system according to any one of the first to third aspects, wherein the wireless device receives a signal from a security sensor. It is a repeater that relays to a disaster prevention receiver.

  A wireless device for a security system according to claim 5 is the wireless device for a security system according to any one of claims 1 to 3, wherein the wireless device directly outputs a signal from a security sensor. It is a receiver which receives it via a relay for disaster prevention or disaster prevention.

  According to the wireless device for the crime prevention system according to claim 1, signals of two frequency bands of the first frequency and the second frequency can be received by one antenna, and an antenna for each frequency band is provided. Since it is not necessary to provide, two frequency bands can be used together with a simple and inexpensive structure. In particular, only a signal having a frequency lower than the first frequency is passed through the first filter and processed by the first signal processing unit, and only a signal having the second frequency or higher is passed through the second filter and processed by the second signal processing unit. Thus, the receiving mechanism of the first frequency band and the transmitting / receiving mechanism of the second frequency band can be electrically separated from each other, and adverse effects due to mixing of two wave signals can be prevented. It becomes possible.

  According to the wireless device for the crime prevention system according to claim 2, the antenna is a monopole antenna, and the length thereof is a length in the vicinity of a quarter wavelength of the first frequency, and Since the length is in the vicinity of the 5/8 wavelength of the second frequency, it is possible to receive signals in two frequency bands of the first frequency and the second frequency with one antenna.

  According to the wireless device for the crime prevention system according to claim 3, it is possible to receive signals in two frequency bands of 426 MHz and 950 MHz with one antenna, and it is necessary to provide an antenna for each frequency band Therefore, the two frequency bands can be used together with a simple and inexpensive structure. In particular, by using the 426 MHz band, which is a data transmission band for specific low-power security radios, it is not necessary to apply for a radio station license and it can be used easily, and the existing crime prevention terminal can be used as it is. In addition, by using the 950 MHz band, communication at a higher speed than the 426 MHz band is possible, and carrier reliability is used to improve communication reliability. These two advantages can coexist because the advantages of being able to be enjoyed.

  According to the wireless device for the crime prevention system according to claim 4, in the repeater that receives the signal from the security sensor and relays it to the disaster prevention receiving device, the signal of two frequency bands is transmitted to one antenna. Since it is not necessary to provide an antenna for each frequency band, the repeater can be configured simply and inexpensively.

  According to the wireless device for the crime prevention system according to claim 5, in the reception device that receives the signal from the security sensor, the signal of two frequency bands can be received by one antenna, and each frequency Since it is not necessary to provide an antenna for each band, the receiving apparatus can be configured simply and inexpensively.

It is explanatory drawing for demonstrating the structure of the wireless crime prevention system which concerns on embodiment of this invention. It is a block diagram which shows the electric constitution of a remote control. It is a block diagram which shows the electric constitution of a repeater. It is a block diagram which shows the electric constitution of a receiver. It is explanatory drawing explaining a radio | wireless transmission / reception structure. It is explanatory drawing for demonstrating transmission / reception of the signal in a crime prevention system. It is explanatory drawing for demonstrating the structure of the conventional radio | wireless crime prevention system.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, the present invention is not limited by this embodiment.

(Overview)
First, the outline of the wireless crime prevention system will be described. FIG. 1 is an explanatory diagram for explaining a configuration of a wireless crime prevention system according to the present embodiment. As shown in FIG. 1, a wireless crime prevention system 1 includes an open / close sensor 10, a fire sensor 11, a human sensor 12, an abnormality notification lamp (outdoor indicator lamp) 13, a repeater 30, and a receiver (a crime prevention receiver). , Center device) 40. Among these, each apparatus except the abnormality notification lamp 13 is disposed indoors in the house, and the abnormality notification lamp 13 is installed outside the house (for example, near the entrance). In the following description, the opening / closing sensor 10, the fire sensor 11, and the human sensor 12 are collectively referred to as “security sensor 2” as necessary, and the security sensor 2 and the abnormality notification lamp 13 are referred to as “ Collectively referred to as “security terminal 3”. Here, one each of the open / close sensor 10, the fire sensor 11, the human sensor 12, the abnormality notification lamp 13, and the repeater 30 are provided, but any plurality may be provided.

  Further, the security system 1 includes a remote controller (mini-controller) 20 unlike the conventional security system shown in FIG. The remote controller 20 is a setting unit for setting the crime prevention state of the receiving device 40. For example, the remote controller 20 is carried by a user or used in an arbitrary place within a range where radio waves reach the indoor repeater 30 or the receiving device 40. In particular, when the receiving device 40 is installed in the living room and the living room is away from the entrance, it takes time until the user releases the security mode in the living receiving device 40 after the user returns home. Since there is a possibility that the crime prevention mode cannot be canceled in time, the convenience of the user can be improved by arranging the remote controller 20 in the vicinity of the entrance.

  In this security system 1, two frequency bands are used in combination as frequency bands for transmitting and receiving signals. Specifically, the 426 MHz band is used between the security terminal 3 and the repeater 30 or the receiving device 40. Further, the 950 MHz band is used among the remote controller 20, the repeater 30, and the receiving device 40. That is, the repeater 30 and the receiving device 40 transmit and receive signals in two frequency bands, a 426 MHz band and a 950 MHz band. In this way, by using the 950 MHz band in addition to the conventional 426 MHz band, the communication speed is improved and the reliability of communication is improved. In particular, the security terminal 3 communicates only in the conventional 426 MHz band, so there is no need to replace existing ones or change the design. On the other hand, the repeater 30 and the receiving device 40 need to transmit and receive signals in two frequency bands. However, by providing only one antenna, the two frequency bands can be used together with a simple and inexpensive structure. To do. A specific structure for this will be described later.

(Configuration-security terminal)
Next, the configuration of the wireless crime prevention system 1 will be described. First, the configuration of the security terminal 3 will be described. However, since the open / close sensor 10, the fire sensor 11, the human sensor 12, and the abnormality notification lamp 13 can be configured in the same manner as in the past, only the outline thereof will be described here. The open / close sensor 10 is a wireless open / close detection means for detecting the open / closed state of the door or window by magnetism or the like. When the open / close sensor 10 detects that the door or window is open, a signal to that effect is wirelessly transmitted. Send in. The fire sensor 11 is a fire detection means for detecting the occurrence of a fire by detecting smoke or heat. When a fire occurrence is detected, a signal to that effect is transmitted wirelessly. The human sensor 12 is a human body detection unit that detects a human body by detecting infrared rays. When a human body is detected, the human sensor 12 wirelessly transmits a signal to that effect. The abnormality notification lamp 13 is an abnormality occurrence notifying means for notifying the occurrence of an abnormality such as a fire outdoors by turning on or blinking when a transfer signal is received from the receiving device 40. However, the detection principle in these security terminals 3 is arbitrary, and other known principles can be used.

(Configuration-remote control)
The remote controller 20 is a wireless device for setting a crime prevention state in the receiving device 40 by transmitting a wireless signal to the receiving device 40. FIG. 2 is a block diagram showing an electrical configuration of the remote controller 20. As shown in FIG. 2, the remote controller 20 includes various button groups 22 and indicator lamp groups 23 on the front surface of the housing, and a wireless transmission / reception unit 24, a speaker 25, a storage unit 26, a power source inside the housing. The unit 27 and the control unit 28 are accommodated.

  The button group 22 includes an emergency button 22a, a start button 22b, a security button 22c, and a release button 22d. The indicator lamp group 23 includes an emergency lamp 23a, an alarm lamp 23b, an OK lamp 23c, an NG lamp 23d, a guard lamp 23e, and a release lamp 23f.

  The wireless transmission / reception unit 24 transmits and receives wireless signals in the 950 MHz band, and includes a dedicated antenna 24a in the 950 MHz band. The speaker 25 outputs an alarm sound. The storage unit 26 is configured by, for example, a flash memory (the same applies to storage units 32, 42, and 52 described later), and stores programs and parameters necessary for control of the remote controller 20. The power supply unit 27 includes a battery (not shown), and supplies power supplied from the battery to each unit of the remote controller 20. The control unit 28 includes, for example, a CPU (Central Processing Unit) (not shown) and a program executed on the CPU (the same applies to the control unit 44 described later). In particular, the control unit 28 includes a signal processing unit 28a. When transmitting a radio signal, the signal processing unit 28a performs carrier sense by a known method, and transmits the radio signal only when radio of the same frequency is not detected.

  In the remote controller 20 configured as described above, when the emergency button 22a is pressed, an emergency signal is transmitted via the wireless transmission / reception unit 24, and the emergency light 23a is turned on or blinking (hereinafter simply referred to as lighting or blinking). It will be described as lighting). When the emergency signal is received by the receiving device 40, the emergency signal is transferred from the receiving device 40 to the security company, and the security guard rushes to the house.

  Alternatively, when the security button 22c is pressed, the security light 23e is turned on, and when the start button 22b is pressed in this state, a security request signal is transmitted via the wireless transmission / reception unit 24. When this guard request signal is received by the receiver 40, the crime prevention mode of the receiver 40 is set to the guard mode. Here, the security mode is a mode in which the security company performs monitoring when the user goes out, and when an abnormality occurs, an abnormal signal is transferred from the receiving device 40 to the security company, and the security guard rushes to the house. Further, when the security mode of the receiving device 40 is set to the security mode in this way, a security confirmation signal is transmitted from the receiving device 40, and this security confirmation signal is received via the wireless transmission / reception unit 24 of the remote controller 20. The OK lamp 23c is turned on. On the other hand, if the security confirmation signal is not received by the remote controller 20 within a predetermined time after the start button 22b is pressed, the NG lamp 23d is turned on.

  When the release button 22d is pressed, the release lamp 23f is turned on. When the start button 22b is pressed in this state, a release request signal is transmitted via the wireless transmission / reception unit 24. When the release request signal is received by the receiving device 40, the crime prevention mode of the receiving device 40 is released. When the crime prevention mode is released in this way, a release confirmation signal is transmitted from the receiving device 40. When this release confirmation signal is received via the wireless transmission / reception unit 24 of the remote controller 20, the OK lamp 23c is turned on. The On the other hand, if the remote control 20 does not receive a release confirmation signal within a predetermined time after the start button 22b is pressed, the NG lamp 23d is turned on.

(Configuration-repeater)
The repeater 30 in FIG. 1 is a relay unit that receives a signal wirelessly transmitted from the security sensor 2 and transmits the received signal to the remote controller 20 or the controller, and is used for a security system that receives a signal from the security sensor 2. Wireless device. The repeater 30 is disposed between the security sensor 2 and the receiving device 40, or is disposed between the receiving device 40 and the abnormality notification lamp 13.

  FIG. 3 is a block diagram showing an electrical configuration of the repeater 30. As shown in FIG. 3, the repeater 30 includes a wireless transmission / reception unit 31, a storage unit 32, a power supply unit 33, and a control unit 34. The wireless transmission / reception unit 31 transmits / receives signals in the 426 MHz band and the 950 MHz band. This wireless transmission / reception unit 31 is provided with only one antenna 31a, and the antenna 31a is used to use both the 426 MHz band and the 950 MHz band. The storage unit 32 stores programs and parameters necessary for controlling the repeater 30. The power supply unit 33 includes a battery (not shown), and supplies power supplied from the battery to each unit of the repeater 30. The control unit 34 is a control unit that controls each unit of the repeater 30, and is a first signal processing unit 34a that processes transmission / reception of signals in the 426 MHz band and a second signal processing unit 34b that processes transmission / reception of signals in the 950 MHz band. Is provided. The first signal processing unit 34a transmits a radio signal in the 426 MHz band without performing carrier sense. The second signal processing unit 34b performs carrier sense by a known method when transmitting a wireless signal in the 950 MHz band, and transmits the wireless signal only when the wireless of the same frequency is not detected. The first signal processing unit 34a and the second signal processing unit 34b are configured by different CPUs and programs executed on the CPUs (a first signal processing unit 53a and a second signal processing unit described later). 53b is the same).

(Configuration-Receiver)
The receiving device 40 of FIG. 1 is a control device that monitors the presence or absence of an abnormality by receiving a signal transmitted from the crime prevention sensor 2 via the repeater 30 or by directly receiving the signal. It is a radio device for a crime prevention system that receives the signal. When the receiving device 40 detects an abnormality, the abnormality notification lamp 13 is wirelessly transmitted to the abnormality notification lamp 13 to notify the abnormality, and if necessary, an abnormality occurrence is wired or wirelessly to the security company. Relocate. The receiving device 40 is installed, for example, in a place (typically, an entrance or a living room) that is easy for a user to visually recognize indoors.

  FIG. 4 is a block diagram illustrating an electrical configuration of the receiving device 40. As shown in FIG. 4, the reception device 40 is configured to accommodate a transmission / reception unit 41, a storage unit 42, a power supply unit 43, a control unit 44, and a wireless transmission / reception unit 50. The transmission / reception unit 41 transmits / receives a signal to / from the wireless transmission / reception unit 50 and supplies power to the wireless transmission / reception unit 50. The storage unit 42 stores programs and parameters necessary for controlling the receiving device 40. The power supply unit 43 supplies power supplied from a commercial power supply to each unit of the receiving device 40. The control unit 44 controls each unit of the receiving device 40.

  The wireless transmission / reception unit 50 is a wireless transmission / reception unit that performs wireless transmission / reception in the reception device 40 and includes a wireless transmission / reception unit 51, a storage unit 52, and a control unit 53. Here, the wireless transmission / reception unit 50 is housed and unitized in a housing (not shown) different from the housing of the receiving device 40 (however, an antenna 51a described later is provided outside the housing). It can be detachably attached to the housing of the receiving device 40. The wireless transmission / reception unit 51 transmits / receives signals in the 426 MHz band and 950 MHz band. The wireless transmission / reception unit 51 is provided with only one antenna 51a. The antenna 51a is used in combination with the 426 MHz band and the 950 MHz band. The storage unit 52 stores programs and parameters necessary for controlling the wireless transmission / reception unit 50. The control unit 53 is a control unit that controls each unit of the wireless transmission / reception unit 50, and a first signal processing unit 53a that processes transmission / reception of signals received in the 426 MHz band and a first signal processing unit that processes transmission / reception of signals received in the 950 MHz band. A two-signal processing unit 53b is provided. The first signal processing unit 53a transmits a radio signal without performing carrier sense in the 426 MHz band. The second signal processing unit 53b performs carrier sense by a known method when transmitting a wireless signal in the 950 MHz band, and transmits the wireless signal only when no radio of the same frequency is detected.

(Configuration-wireless transmission / reception structure)
Here, the radio transmission / reception structure in the radio transmission / reception unit 50 of the repeater 30 and the reception device 40 will be described. However, the wireless transmission / reception structure in the repeater 30 and the wireless transmission / reception structure in the wireless transmission / reception unit 50 are common except for special cases (in the following description of the wireless transmission / reception structure, reference numerals 31, The component including 34 is a component of the repeater 30, and the component including reference numerals 51 and 53 is a component of the wireless transmission / reception unit 50).

  FIG. 5 is an explanatory diagram for explaining a radio transmission / reception structure. As shown in FIG. 5, the antennas 31a and 51a are configured as monopole antennas, and are provided with feeding points 31b and 51b at one end thereof. The feeding points 31b and 51b are connected to the duplexers 31c and 51c via a common coaxial cable, and the duplexers 31c and 51c are LPF (low-pass filter, first filter) via different coaxial cables. ) 31d and 51d and HPF (high pass filter, second filter) 31e and 51e, respectively. The LPFs 31d and 51d are connected to the first signal processing units 34a and 53a, and the HPFs 31e and 51e are connected to the second signal processing units 34b and 53b.

Here, the total length L of the antennas 31a and 51a is determined so that the 426 MHz band and the 950 MHz band can be used together. That is, the total length L of the antennas 31a and 51a is determined to be a quarter wavelength of 426 MHz and 5/8 wavelength of 950 MHz. Specifically, the total length L of the quarter wavelength antennas 31a and 51a in the 426 MHz band L = ((300 × 10 ⁶ ) / (426 × 10 ⁶ )) / 4≈0.176 m = 17.6 cm is in the 950 MHz band. Is substantially the same as ((300 × 10 ⁶ ) / (950 × 10 ⁶ )) × 5 / 8≈19.7 = 19.7 cm of the 5/8 wavelength of the antenna 31a, 51a. It is 6 cm (however, in actuality, it is determined in consideration of the shortening rate).

  The LPFs 31d and 51d pass only signals in the vicinity of the 426 MHz band, and the HPFs 31e and 51e pass only signals in the vicinity of the 950 MHz band. According to such a configuration, a transmission / reception mechanism in the 426 MHz band from the demultiplexers 31c and 51c to the first signal processing units 34a and 53a, and 950 MHz from the demultiplexers 31c and 51c to the second signal processing units 34b and 53b. The band transmission / reception mechanism can be electrically separated from each other, and adverse effects caused by mixing of the two-wave signals can be prevented.

(processing)
Next, the process which the crime prevention system 1 comprised as mentioned above performs is demonstrated. FIG. 6 is an explanatory diagram for explaining transmission and reception of signals in the security system 1. In the following, “step” is abbreviated as “S”.

  As shown in FIG. 6, the security sensor 2 transmits an abnormality detection signal without performing carrier sense in the 426 MHz band (SA1). When this abnormality detection signal is received via the first signal processing unit 34a of the repeater 30, the relay 30 receives the abnormality detection signal via the first signal processing unit 34a without performing carrier sense. Transmission is performed in the 426 MHz band, which is the same frequency band as the signal (SA2). Then, when the abnormality detection signal from the security sensor 2 is directly received via the first signal processing unit 53a of the wireless transmission / reception unit 50 of the reception device 40, or the abnormality detection signal from the repeater 30 is received from the reception device 40. When received via the first signal processing unit 53a of the wireless transmission / reception unit 50, the wireless transmission / reception unit 50 processes the abnormality detection signal by the first signal processing unit 53a and responds to the content of the abnormality detection signal. Perform predetermined processing. As a part of such processing, the receiving device 40 can detect the abnormality notification lamp 13 in the 426 MHz band without performing carrier sense via the first signal processing unit 53a of the wireless transmission / reception unit 50 as necessary. The abnormality notification lamp 13 that transmits the transmission signal and receives the transmission signal displays the abnormality notification (SA3).

  The remote controller 20 transmits a request signal after performing carrier sense in the 950 MHz band (SA4). When this request signal is received via the second signal processing unit 34b of the repeater 30, the repeater 30 receives the request signal after performing carrier sense on the request signal via the second signal processing unit 34b. Is transmitted in the 950 MHz band, which is the same frequency band as (SA5). When the request signal from the remote controller 20 is directly received via the second signal processing unit 53b of the wireless transmission / reception unit 50 of the reception device 40, or the request signal from the repeater 30 is received by the wireless transmission / reception unit of the reception device 40. When the signal is received via the 50 second signal processing unit 53b, the receiving device 40 processes the request signal by the second signal processing unit 53b, and performs predetermined processing according to the content of the request signal. As a part of such processing, the receiving device 40 950 MHz band which is the same frequency band as the signal received after performing carrier sense on the confirmation signal via the second signal processing unit 53b as necessary. (SA6). When this confirmation signal is received via the second signal processing unit 34b of the repeater 30, the repeater 30 performs carrier sense on the confirmation signal while maintaining the 950M band via the second signal processing unit 34b. (SA7). When the confirmation signal from the receiving device 40 is directly received by the remote controller 20, or when the confirmation signal from the repeater 30 is received by the remote controller 20, the remote controller 20 processes the confirmation signal by the control unit 28, A predetermined process is performed according to the content of the confirmation signal.

(effect)
As described above, according to the present embodiment, signals in two frequency bands of the first frequency and the second frequency can be received by one antenna 31a, 51a, and it is necessary to provide an antenna for each frequency band. Therefore, the two frequency bands can be used together with a simple and inexpensive structure. In particular, only signals having a frequency lower than the first frequency are passed through the LPFs 31d and 51d and processed by the first signal processing units 34a and 53a, and only signals having the second frequency and higher are passed through the HPFs 31e and 51e and passed through the second signal processing unit 34b. , 53b, the first frequency band receiving mechanism and the second frequency band transmitting / receiving mechanism can be electrically separated from each other, and two-wave signals are mixed and the like. It is possible to prevent adverse effects.

  The antennas 31a and 51a are monopole antennas, and the length thereof is a length in the vicinity of a quarter wavelength of the first frequency and a length in the vicinity of the fifth frequency of the second frequency. As a result, it is possible to receive signals in two frequency bands, the first frequency and the second frequency, by the single antennas 31a and 51a.

  In addition, signals in two frequency bands of 426 MHz and 950 MHz can be received by one antenna 31a and 51a, and it is not necessary to provide an antenna for each frequency band. Can be used together in structure. In particular, by using the 426 MHz band, which is a data transmission band in the specific low-power security radio, it is possible to easily use it without applying for a radio station license and to use the existing crime prevention terminal 3 as it is. In addition, by using the 950 MHz band, communication at a higher speed than the 426 MHz band is possible, and carrier reliability improves communication reliability. These two advantages can coexist.

  Further, in the repeater 30 that receives the signal from the security sensor 2 and relays it to the disaster prevention receiver 40, signals of two frequency bands can be received by one antenna 31a, 51a, and each frequency band Since it is not necessary to provide each antenna, the repeater 30 can be configured simply and inexpensively.

  Further, in the receiving device 40 that receives a signal from the security sensor 2, signals of two frequency bands can be received by one antenna 31a, 51a, and there is no need to provide an antenna for each frequency band. The receiving device 40 can be configured simply and inexpensively.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. it can. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved. For example, when two frequency bands are used together by a single antenna 31a, 51a, even if the wireless device cannot be configured at a lower cost than when two frequency bands are used by dedicated antennas, As long as the wireless device can be simply configured, the problems of the present invention are solved.

(About signal transmission and reception)
In the above embodiment, each of the repeater 30 and the receiving device 40 performs both reception and transmission of signals in two frequency bands, but it is sufficient that only reception of signals in at least two frequency bands can be performed. For example, the repeater 30 receives a signal transmitted in the 426 MHz band from the security sensor 2 and receives a signal transmitted in the 950 MHz band from the receiving device 40 or the remote controller 20, while regarding the transmission, the receiving device 40 or The remote control 20 may be performed only in the 950 MHz band. Further, the receiving device 40 receives a signal transmitted from the security sensor 2 in the 426 MHz band and receives a signal transmitted from the repeater 30 or the remote controller 20 in the 950 MHz band, but does not perform wireless signal transmission. If necessary, signal transmission to a security company or the like may be performed by wire.

(Signal frequency)
In the above embodiment, the 426 MHz band and the 950 MHz band are used together, but the other two frequency bands may be used together.

DESCRIPTION OF SYMBOLS 1,106 Security system 2 Security sensor 3 Security terminal 10, 101 Opening / closing sensor 11, 102 Fire sensor 12, 103 Human sensor 13, 104 Abnormal alarm light 20 Remote control 21, 31, 41, 51 Case 22 Button group 22a Emergency button 22b Start button 22c Security button 22d Release button 23 Indicator light group 23a Emergency light 23b Alarm light 23c OK light 23d NG light 23e Security light 23f Release light 24, 31, 51 Radio transmission / reception unit 24a, 31a, 51a Antenna 25 Speaker 26, 32 , 42, 53 Storage unit 27, 33, 43 Power supply unit 28, 34, 44, 53 Control unit 28a Signal processing unit 30, 105 Repeater 31b, 51b Feed point 31c, 51c Demultiplexer 31d, 51d LPF
31e, 51e HPF
34a, 53a First signal processor 34b, 53b Second signal processor 40, 106 Receiver 41 Transmitter / receiver 50 Wireless transmitter / receiver unit

Claims (5)

A wireless device for a security system that receives a signal from a security sensor,
An antenna capable of receiving a signal at a predetermined first frequency and receiving a signal at a predetermined second frequency higher than the first frequency;
A first filter connected to the antenna and passing only signals below the first frequency;
A second filter connected to the antenna and passing only signals of the second frequency or higher;
A first signal processing unit connected to the first filter and performing reception processing of the signal of the first frequency;
A second signal processing unit connected to the second filter and configured to receive a signal of the second frequency;
A wireless device for a crime prevention system. The antenna is a monopole antenna,
The length of the antenna is a length in the vicinity of ¼ wavelength of the first frequency, and a length in the vicinity of 5/8 wavelength of the second frequency,
The wireless device for the crime prevention system according to claim 1. The first frequency is 426 MHz;
The second frequency is 950 MHz;
A wireless device for the security system according to claim 1 or 2. The wireless device is a repeater that receives a signal from a security sensor and relays it to a receiving device for disaster prevention.
The radio | wireless apparatus as described in any one of Claim 1 to 3. The wireless device is a receiving device that receives a signal from a security sensor directly or via a disaster prevention repeater,
The radio | wireless apparatus as described in any one of Claim 1 to 3.

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