JP4209821B2 - Wireless reporting device - Google Patents

Description

  The present invention relates to a wireless notification device that detects the intrusion of a suspicious person or the like and notifies wirelessly.

  In recent years, with the increasing demand for security systems, various types of wireless notification devices have been commercialized, and the market has been increasing.

  Hereinafter, an example of the above-described conventional wireless notification device will be described with reference to the drawings. FIG. 3 shows a block diagram of a conventional radio notification apparatus.

  In FIG. 3, reference numeral 1 denotes an antenna, which functions as a transmission antenna for transmitting a report by radio waves and a reception antenna for receiving radio waves emitted from other radio stations. Reference numeral 2 denotes an antenna selector switch that switches the antenna 1 to the RX terminal at the time of reception and to the TX terminal at the time of transmission. Reference numeral 3 denotes reception tuning means, which is connected to the RX terminal of the antenna changeover switch 2 and tunes to the frequency fa of the radio wave received by the antenna 1 to receive the radio wave. Reference numeral 4 denotes a signal strength detection unit which is connected to the reception tuning unit 3 and detects the signal strength of the radio wave received by the reception tuning unit 3. Reference numeral 5 denotes a signal strength determination means, which is connected to the signal strength detection means 4. When the signal strength detected by the signal strength detection means 4 is higher than a preset level, a logic level H is obtained. Is output.

  Reference numeral 8 denotes a control means having two input terminals x and z and one output terminal y. The output of the signal strength determination means 5 is connected to the input terminal x of the control means 8. Reference numeral 6 denotes a wireless notification transmission means, to which the output terminal y of the control means 8 is connected, transmits a wireless notification when the output terminal y is at a logic level H, and transmits a wireless notification when the output terminal y is at a logic level L. Shall stop. The radio notification transmission means 6 is connected to the TX terminal of the antenna changeover switch 2. When the antenna changeover switch 2 is connected to the TX terminal, the notification can be transmitted by radio waves via the antenna 1. I can do it. On the other hand, the output terminal y of the control means 8 is also used for switching the antenna changeover switch 2, and when the output terminal y of the control means 8 is at the logic level H, the common terminal C of the antenna changeover switch is connected to the TX side. When the logic level is L, the common terminal C is connected to the RX side.

  That is, when the output terminal y of the control means 8 is at the logic level H, the radio notification means 6 performs the radio notification operation and the antenna changeover switch 2 is connected to the TX side, so the output of the radio notification means 6 is the antenna changeover switch. 2 is connected to the antenna 1 via 2, and the notification is radiated to the space as a radio wave of the frequency fa.

  Further, when the output terminal y of the control means 8 is at the logic level L, the radio notification means 6 does not perform the radio notification operation, and the antenna changeover switch 2 is connected to the RX side, so that the antenna 1 is connected to the reception tuning means 3. As a result, the antenna 1 functions as a receiving antenna for receiving radio waves of other radio stations and supplying them to the receiving tuning means 3. 9 is a human body. Reference numeral 7 denotes an infrared human body sensor that receives infrared rays from the human body 9 as an infrared emitter, and outputs a logical level H when the human body 9 approaches, and outputs a logical level L when the human body 9 does not approach. To do. The output of the infrared human body sensor 7 is connected to the input terminal z of the control means 8.

  Next, the operation of the control means 8 will be described. The control means 8 sets the output terminal y to the logic level H only for a predetermined period only when the input terminal z is at the logic level H and the input terminal x is at L.

  Here, the purpose and operation of the signal strength determination means 5 will be described. When the wireless notification means 6 performs wireless notification, it is normally performed after confirming that the frequency of the radio wave to be transmitted is not used by another wireless station. This is because if radio waves with the same frequency are used by other radio stations, radiating radio waves with the same frequency at the same time may not only interfere with the communication of the other station, but also the own station will emit. There is a possibility that the receiving station that should receive the message cannot receive the message normally due to mutual interference of radio waves.

  Depending on the type of radio wave used, it may be legally required to confirm that other radio stations are not using the frequency to be transmitted before transmission. The radio equipment that performs the reception operation in advance at the frequency of the radio wave that it is going to emit, and transmits at that frequency only when the signal strength of the radio wave emitted by another radio station is below a certain level. Allowed.

  Therefore, when transmitting radio waves, check the signal strength of the radio wave of the frequency to be transmitted. If the signal strength is lower than a certain level, transmission is possible. Wait for it. This operation is generally called carrier sense. That is, the signal strength determination means 5 is for determining whether the signal strength is higher or lower than a certain level for the carrier sense operation.

  The operation of the radio notification apparatus configured as described above will be described below. First, it is assumed that the human body 9 is not approaching at first.

  Since there is no approach of the human body 9, the output of the infrared human body sensor 7 is at the logic level L. Therefore, since the input terminal z of the control means 8 is also at the logic level L, the output terminal y of the control means 8 is at the logic level L regardless of the logic level of the input terminal x, and the antenna selector switch 2 is connected to the RX side. . That is, the antenna 1 functions as a reception antenna, and inputs the received radio wave to the reception tuning means 3.

  Next, a case where the human body 9 approaches the infrared human body sensor 7 will be described. When the human body 9 approaches, the output of the infrared human body sensor 7 becomes a logic level H. Therefore, the input terminal z of the control means 8 is also at the logic level H. At this time, the output of the signal strength determining means 5, that is, the logic level of the input terminal x of the control means 8 is monitored. If the input terminal x is at the logic level H, the frequency fa is being used by another radio station. The output terminal y of the control means 8 remains at the logic level L and waits for the input terminal x to reach the logic level L. When the radio wave of the frequency fa disappears, the output of the signal strength determination means 5 becomes L, so that the logic level of the input terminal x of the control means 8 becomes L, and the control means 8 determines that radio notification transmission is possible, and the output terminal y To logic level H.

  Accordingly, the wireless notification means 6 transmits a wireless notification, and the antenna changeover switch 2 is connected to the TX side, so that the notification transmitted by the wireless notification means 6 is launched into the space by the antenna 1. That is, as a result, when the human body 9 approaches the infrared human body sensor 7, a radio notification is transmitted at the frequency fa only when the frequency fa is not used by another radio station.

However, in the configuration as described above, since an infrared human body sensor is used for detecting the approach of a human body, there are problems with respect to the following environmental changes.
(1) When the ambient temperature is around 37 degrees, the human body temperature cannot be discriminated, so that the approach of the human body cannot be detected.
(2) When raindrops or the like adhere to the light receiving portion of the sensor, the amount of received infrared energy changes, so that it is regarded as a human body detection, which causes false alarms.
(3) Since the amount of infrared energy changes when exposed to direct sunlight, it is regarded as human body detection, which causes false alarms.

  The present invention solves the above-mentioned problems, has a reliable human body detection function even in an environmental change, and combines the basic reception function originally owned by the radio notification device as a part of the human body detection function, An object of the present invention is to provide a wireless notification device that operates inexpensively and reliably.

In order to solve the above problems, the wireless notification device of the present invention is
A radio wave transmission means for continuously or intermittently transmitting a radio wave of a specific frequency;
An antenna for receiving radio waves of the specific frequency;
Receiving tuning means that can be tuned to a plurality of radio wave frequencies, and the frequency of the radio wave transmitted by the radio wave transmitting means is one of the tuning frequencies;
Signal strength detection means for detecting the signal strength of the radio wave of the specific frequency received and tuned by the reception tuning means;
Signal change determination means for determining that a conductive object such as a human body or a metal in the vicinity of the antenna has moved when the signal intensity detected by the signal intensity detection means is higher or lower than a steady state; ,
And a wireless notification means for transmitting a notification by wireless radio waves when it is determined by the signal change determination means that the conductive object has moved.

  Further, in the above-mentioned radio notification device, the signal changes when the signal transmitted through the reception signal tuning circuit is detected by using the radio wave for public broadcasting without using the radio wave transmission means of the specific frequency, and a difference from the normal value occurs. It is characterized by determining.

  With the above-described configuration, the wireless notification device of the present invention can reliably detect a human body even if the environment such as temperature and weather changes, and the basic reception originally owned by the wireless notification device. By combining the function as part of the human body detection function, it is possible to provide a wireless notification device that operates reliably at low cost.

Embodiments according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the component of the function similar to the conventional Example.
<First Embodiment>
FIG. 1 shows a block diagram of a radio notification apparatus according to an embodiment of the present invention, and components having the same reference numerals as those in FIG.

  In FIG. 1, reference numeral 3 denotes reception tuning means, but the point different from the conventional example is that a reception tuning frequency changeover switch 10 is connected, and two contacts a and b of the reception tuning changeover switch 10 are connected. Has been. When the reception tuning frequency changeover switch 10 is connected to the contact point a, the reception tuning means 3 uses the same frequency fa as the frequency used when the radio notification transmission means 6 transmits a notification as a tuning frequency, and also receives reception tuning. When the frequency changeover switch 10 is connected to the contact b, the reception tuning operation is performed using another frequency fb as a tuning frequency. Whether the reception tuning frequency changeover switch 10 is connected to the contact a or the contact b is determined by the logic level of the output terminal v of the control means 8. Reference numeral 11 is a signal change determining means connected to the output of the signal intensity detecting means 4, and it is determined that the signal intensity has changed when the signal intensity detected by the signal intensity detecting means 4 becomes higher or lower than the steady state. And output the determination result. The signal change determination means 11 outputs a logic level L when the signal intensity does not change, and outputs a logic level H when the signal intensity changes.

  The control means 8 is the same as the conventional example in that it has an output terminal y, an input terminal x, and an input terminal z, but newly has another output terminal v. The output terminal v of the control means 8 functions as a switching signal for the reception tuning frequency changeover switch 10. When the output terminal v of the control means 8 outputs a logic level H, the reception tuning frequency changeover switch 10 is connected to the contact a. When the output terminal v of the control means 8 outputs a logic level L, the reception tuning frequency changeover switch 10 is connected to the contact b. When the input terminal z outputs a logic level H, the output terminal v of the control means 8 outputs a logic level H and connects the reception tuning frequency changeover switch 10 to the contact a.

  The operation of the radio notification transmission means 6 with respect to the logic levels H and L of the output terminal y of the control means 8 is exactly the same as in the conventional example, and the frequency for transmission is the same as in the conventional example and the frequency fa. Reference numeral 12 denotes a wireless radio wave transmission means that continuously transmits a radio wave of a specific frequency fb with a constant radiation power by the transmitting antenna 13.

  The operation of the radio notification apparatus configured as described above will be described below with reference to FIGS.

FIG. 2 is an explanatory diagram of the characteristics of radio waves. Reference numeral 13 denotes a transmission antenna that radiates radio waves having a specific frequency. Reference numeral 1 denotes a reception antenna that receives radio waves radiated by the transmission antenna. 14 is the ground, 15 and 16 are obstacles that reflect radio waves such as buildings. In FIG. 2, the radio wave transmitted by the transmission antenna 13 is radiated to space, but there are innumerable paths, and the following components arrive at the reception antenna 1 and are combined, for example.
(1) A component that reaches the receiving antenna 1 directly.
(2) A component that is reflected by the ground 14 and reaches the receiving antenna 1.
(3) A component that is reflected by the obstacle 15 and reaches the receiving antenna 1.
(4) A component that reflects to the obstacle 16 and reaches the receiving antenna 1.
(5) A component that reaches the receiving antenna 1 after being reflected by the obstacle 15 and further reflected by the obstacle 16.

  An infinite number of radio wave arrival paths are formed by the positional relationship between the transmitting antenna 13 and the receiving antenna 1, the frequency of the radio wave, and surrounding obstacles that reflect the radio wave. Radio waves are combined at the point of the receiving antenna 1, and a certain electromotive force is generated in the receiving antenna 1.

  Here, when a human body enters into the infinite number of radio wave arrival paths described above, a certain path is blocked on the one hand, and on the other hand, radio waves are reflected on the invading human body to form a new path. As a result, the intensity of the radio wave synthesized at the point of the receiving antenna 1 changes. In this case, the intensity does not necessarily become weak and may become strong depending on conditions, but anyway, if a human body invades, the intensity of the radio wave at the reception point changes. In addition, the intensity of the radio wave at the reception point is very little affected by temperature, weather, and the like.

  As described above, the radio wave has a property of changing the electromotive force generated in the receiving antenna when an object that reflects the radio wave such as a human body enters between the transmitting antenna and the receiving antenna, and the changing electromotive force is Insensitive to temperature and weather.

  Next, the operation of the embodiment will be described with reference to FIG. In FIG. 1, as an initial state, the output terminal v of the control means 8 outputs a logic level L, and the reception tuning frequency changeover switch 10 is connected to the contact b. Therefore, the tuning frequency of the receiving tuning means 3 is the same as the frequency fb of the radio wave transmitted by the radio wave transmitting means 12. Further, it is assumed that the radio wave transmission means 12 continuously radiates radio waves of the frequency fb by the transmission antenna 13 and there is no human body between the transmission antenna 13 and the antenna 1.

  In this state, as described with reference to FIG. 2, the radio wave radiated from the transmission antenna 13 reaches the antenna 1 through an infinite number of paths and generates a certain level of electromotive force. This electromotive force is received and tuned by the receiving tuning means 3, and the strength of the electromotive force is further detected by the signal strength detecting means 4 and input to the signal change determining means 11. The signal change determination means 11 stores the signal intensity at this time when no human body has entered. Since there is no change in the signal intensity in a steady state where no human body has entered, the logic level of the output of the signal change determination means 11 is L.

  Next, it is assumed that the human body 9 has entered between the transmission antenna 13 and the antenna 1. In this case, as described with reference to FIG. 2, the electromotive force generated in the antenna 1 changes. Therefore, since the intensity of the signal detected by the signal intensity detection means 4 changes, the signal change determination means 11 determines that the signal intensity has changed by comparing with the signal intensity in the steady state. The output 11 logic level is switched to H.

  Therefore, since the input terminal z of the control means 8 changes from the logic level L to H, the control means 8 determines that a human body has entered and switches the output terminal v to the logic level H. Since the logic level of the output terminal v of the control means 8 becomes H, the reception tuning frequency changeover switch 10 is switched from the contact b to the contact a, and the tuning frequency of the reception tuning means 3 becomes fa. Since the reception tuning frequency is fa and is the same as the frequency of the radio wave used to transmit the notification by the wireless notification transmission means 6, the subsequent operation is exactly the same as the conventional example.

  That is, if the output of the signal strength determination means 5 is H, the frequency fa is being used by another radio station, so the output terminal y of the control means 8 remains at the logic level L, and the signal strength determination means 5 Wait for the output to go to logic level L. When the radio wave of the frequency fa disappears, the output of the signal strength determination unit 5 becomes L, so that the control unit 8 determines that transmission is possible at the frequency fa and switches the output terminal y to the logic level H. Accordingly, the wireless notification means 6 transmits a wireless notification, and the antenna changeover switch 2 is connected to the TX side, so that the notification transmitted by the wireless notification means 6 is emitted into the space as a radio wave of the frequency fa by the antenna 1. .

<Second Embodiment>
FIG. 4 shows a block diagram of a radio notification apparatus according to another embodiment of the present invention, and components having the same reference numerals as those in FIG.

  In FIG. 4, a specific frequency is tuned to the radio wave for public broadcasting by the reception tuning means, and a specific example will be described in the case of receiving a TV radio wave.

It is not necessary to use a high-performance antenna, and a simple rod antenna can be substituted for the antenna 1, and it is possible to reliably detect the influence of obstacles such as a human body by using a simple antenna to make a weak reception state. The detection location can be easily selected by using a lot antenna.
Therefore, the antenna can be used at a remote TV radio frequency fc even if it is tuned to a frequency resonating with the frequency fa.

  In addition, since the radio wave for sending video requires a large amount of information and requires a wide band radio wave, it reacts greatly to a small obstacle such as a human body in the direction of signal deterioration. Reference numeral 18 denotes signal detection means for detecting television radio waves. Here, a video signal is extracted and sent to the signal change determination means 11.

  The signal change determination means 11 can normally extract a normal synchronization signal from the video signal in a state where the radio wave is normally received. However, if the received radio wave becomes weak, the synchronization signal cannot be extracted, and a so-called synchronization failure state occurs. In the case of an analog television signal, a synchronous signal separation integrated circuit is commercially available for this determination at a low cost. By using this, a determination output can be easily taken out. In a digitized television signal, a specified sync pulse is used as a sync signal. In this case, it is determined by determining whether the sync pulse data is a specified value.

  In this embodiment, the disturbance of the synchronization signal is detected. However, the method of detecting the disturbance of the video signal and the audio signal can also be used, and the TV radio wave is described as an example of the public broadcast radio wave. However, various public broadcast radio waves can be used. . The signal change determination means 11 outputs a logic level L for a normal synchronization signal, and outputs a logic level H when the synchronization signal is disturbed.

As described above, the second embodiment does not have the radio wave transmission means 12 and uses the radio wave for public broadcasting as compared with the first embodiment, and the basic principle such as the characteristics of the radio wave is the same as that of the first embodiment. Yes,
The logic levels of the input terminal x, the output terminal y, and the output terminal z of the control means 8 and the operation of the radio notification transmitting means 6 are exactly the same as in the first embodiment.

  As described above, according to the present embodiment, a radio wave transmission means for continuously or intermittently transmitting a radio wave of a specific frequency, an antenna for receiving the radio wave of the specific frequency, and a plurality of radio wave frequencies. A receiving tuning means that can be tuned and the frequency of the radio wave transmitted by the radio wave transmitting means is one of the tuning frequencies, and the signal intensity of the radio wave of the specific frequency that is received and tuned by the receiving tuning means Signal strength detection means for detecting the signal, and when the signal strength detected by the signal strength detection means is higher or lower than the steady state, a conductive object such as a human body or metal in the vicinity of the antenna has moved. A signal change determination means for determining that the object is to be transmitted, and for transmitting a report by radio wave when the signal change determination means determines that the conductive object has moved. By providing wireless notification means, it is possible to reliably detect the human body even when the environment such as temperature and weather changes, and the basic reception function originally owned by the wireless notification device is the human body detection function. Therefore, it is possible to provide a wireless notification device that operates inexpensively and reliably.

Further, in the second embodiment, instead of the radio wave transmission means of the first embodiment, a public broadcast wave is used and has the same utility value.

  In the first embodiment of the present invention, the signal strength determination means 5 and the signal change determination means 11 are described as separate ones. However, the signal strength obtained by the signal strength detection means 4 is digitized by D / A conversion. Needless to say, the same effect can be obtained by a method of determining the signal intensity according to the change amount of the numerical value or determining the signal change.

The block diagram of the radio | wireless notification means which shows embodiment of this invention Radio wave characteristics explanatory diagram Block diagram of conventional wireless reporting means The block diagram of the radio | wireless alerting | reporting means which shows another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna 2 Antenna change-over switch 3 Reception tuning means 4 Signal strength detection means 5 Signal strength determination means 6 Radio | wireless message transmission means 7 Infrared human body sensor 8 Control means 9 Human body 10 Reception tuning frequency changeover switch 11 Signal change determination means 12 Radio wave transmission means 13 Transmitting antenna 14 Ground 15, 16 Obstacle 17 Broadcasting wave transmitting antenna 18 Signal detection means

Claims (1)

  A public broadcast radio wave is used as a radio wave of a specific frequency, and an antenna for receiving the radio wave of the specific frequency, which can be tuned to a plurality of radio wave frequencies. Receiving tuning means, signal detecting means for detecting the radio wave signal of the specific frequency received and tuned by the receiving tuning means, and the antenna when the signal intensity detected by the signal detecting means changes from a normal value. A signal change determining means for determining that a conductive object such as a human body or a metal in the vicinity of the object has moved, and for transmitting a report by radio wave when the signal change determining means determines that the conductive object has moved. A wireless notification device comprising a wireless notification means.

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