JP2009229318A - Human detection device and human detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a human detection device and a human detection method having higher reliability. <P>SOLUTION: A master machine 11 transmits a signal from an antenna 102. A detection part 202 of a slave unit 12 converts the signal into a voltage, and an A/D conversion part 203 digitizes the voltage. A signal transmission part 204 generates a signal indicating a voltage value acquired by digitization, and transmits it from an antenna 201. An operation part 104 of the master machine 11 calculates a value Vd indicating a change with time of a voltage indicated by the signal. A determination part 106 reads out a threshold Vth from a threshold storage part 105, and determines whether the value Vd exceeds the threshold Vth. When determined that the value Vd exceeds the threshold Vth, a detection signal transmission part 107 transmits a detection signal indicating that a human is detected to a communication network 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a human detection device and a human detection method.

  In recent years, crimes for invading indoors such as houses and offices are increasing. On the other hand, an aging society with a declining birthrate has arrived, and new social problems such as solitary death have arisen as the number of elderly living alone has increased. Under such circumstances, demands for services such as crime prevention and watching are increasing with increasing social demands for safety and security. The key to these services is a sensor that detects people, and at present, detection of people by infrared rays or images is the mainstream. There are mainly two types of infrared sensors. One is to transmit / receive infrared rays between a transmitter and a receiver, and to detect that there is a person when the infrared rays are blocked by an object and cannot be transmitted / received. The other is to detect people by detecting infrared rays emitted by people and animals.

  The image sensor analyzes a difference between images captured by the camera (the current image and the previous image), and detects a person when the difference value is changed. Image sensors are attracting attention as a means for accurately detecting people due to recent improvements in image processing and image recognition techniques.

Recently, methods for detecting people using radio waves have been studied. Radio sensors include an active type in which the sensor itself transmits radio waves and a passive type in which existing radio waves are used in space, such as radio waves of mobile phone base stations. As for the active type, a sensor that detects a person from a frequency difference or an amplitude difference due to the Doppler effect and a sensor that uses an FM-CW method have been developed (for example, see Patent Document 1).
JP 2000-338231 A

  Infrared sensors are widely used because of their high detection sensitivity, but because they have the property of high straightness, blind spots may be caused by indoor obstacles (walls, pillars, etc.). For this reason, it is necessary to install a plurality of infrared sensors, which increases the cost. In addition, when detecting infrared rays emitted by a person, an animal such as a pet may be erroneously detected as a person.

  In addition, since the image sensor shoots indoors, there is a psychological resistance to application in a place related to privacy such as a general residence. Further, like the infrared sensor, the image sensor cannot capture an image of a blind spot blocked by a wall or the like. For this reason, it is necessary to install a plurality of image sensors, which increases the cost.

  Since an active radio wave sensor transmits radio waves by itself, the power consumption of the device increases, which may affect the surrounding electromagnetic environment. In addition, it is conceivable that the passive type uses TV broadcast waves or mobile phone base station radio waves. However, when radio waves arrive from outside, the state of the propagation path between the transmitting antenna and the building changes. There was a risk of false detection.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a more reliable human detection device and human detection method.

  In order to solve the above problem, the human detection device according to claim 1 includes a master unit and a slave unit of a wireless LAN device, the master unit is connected to a communication network, and the master unit generates a signal. Means for transmitting the signal; means for receiving the signal transmitted from the slave; means for obtaining a value indicating a time change of the voltage indicated by the signal; and a threshold value in which the value is set in advance. Means for determining whether or not the value exceeds the threshold, and means for sending a detection signal indicating that a person has been detected to the communication network when the value is determined to exceed a threshold value, The slave unit includes an antenna that receives a signal transmitted from the antenna, a unit that converts the received signal into a voltage, and a unit that transmits a signal indicating the voltage to the master unit. To do.

  The human detection device according to claim 2 includes a master unit and a slave unit of a wireless LAN device, the master unit is connected to a communication network, the master unit generates a signal, and an antenna that transmits the signal And means for receiving a signal transmitted from the slave unit, and means for sending a signal indicating that a person has been detected to the communication network when the signal is received, An antenna for receiving a signal transmitted from the antenna, a means for converting the received signal into a voltage, a means for obtaining a value indicating a time change of the voltage, and the value exceeds a preset threshold value And a means for transmitting a signal to the master unit when it is determined that the value exceeds a threshold value.

  According to a third aspect of the present invention, the human detection device includes a master unit of a wireless LAN device and a plurality of slave units, the master unit is connected to a communication network, the master unit generates a signal, and sends the signal Antenna, a means for receiving a signal transmitted from each slave unit, a means for obtaining a value indicating a time change of a voltage indicated by each signal, and whether each value exceeds a preset threshold value And a means for sending a detection signal indicating that a person has been detected to each of the communication networks when each value is determined to exceed a threshold value. Comprises an antenna for receiving a signal transmitted from the antenna, means for converting the received signal into a voltage, and means for transmitting a signal indicating the voltage to the base unit.

  According to a fourth aspect of the present invention, the human detection device includes a master unit of a wireless LAN device and a plurality of slave units, the master unit is connected to a communication network, and the master unit sends out the signal and means for generating a signal. Antenna, a means for receiving a signal transmitted from each slave unit, a means for obtaining a value indicating a time change of a voltage indicated by the signal, and a slave unit in a region where a person is present from each value. Means for selecting a value obtained from the transmitted information, and means for sending a detection signal indicating that a person has been detected in the area of the slave that has transmitted a signal corresponding to the selected value to the communication network Each of the slave units includes an antenna that receives a signal transmitted from the antenna, a unit that converts the received signal into a voltage, and a unit that transmits a signal indicating the voltage to the master unit. Having And butterflies.

  The human detection method according to claim 5 includes a master unit and a slave unit of a wireless LAN device, and the master unit is a person detection method performed by a human detection device connected to a communication network, wherein the master unit is a signal And the slave unit receives the signal transmitted from the antenna by the antenna, converts the received signal into a voltage, and outputs a signal indicating the voltage to the master unit. The master unit receives the signal transmitted from the slave unit, obtains a value indicating the time change of the voltage indicated by the signal, and whether the value exceeds a preset threshold value. If it is determined that the value exceeds the threshold, a detection signal indicating that a person has been detected is transmitted to the communication network.

  The human detection method according to claim 6 includes a master unit and a slave unit of a wireless LAN device, and the master unit is a person detection method performed by a human detection device connected to a communication network, wherein the master unit is a signal The slave unit transmits the signal from the antenna, the slave unit receives the signal transmitted from the antenna, converts the received signal into a voltage, and sets a value indicating a time change of the voltage. To determine whether the value exceeds a preset threshold, and if it is determined that the value exceeds the threshold, a signal is transmitted to the parent device, the parent device, When a signal transmitted from the slave unit is received, a signal indicating that a person has been detected is transmitted to the communication network.

  The human detection method according to claim 7 includes a master unit of a wireless LAN device and a plurality of slave units, and the master unit is a person detection method performed by a human detection device connected to a communication network, , Generate a signal, send the signal from the antenna, each slave unit receives the signal sent from the antenna by the antenna, converts the received signal to a voltage, and outputs a signal indicating the voltage Transmitted to the master unit, the master unit receives a signal transmitted from each slave unit, obtains a value indicating a time change of the voltage indicated by each signal, and each value is set in advance. It is determined whether or not a threshold value is exceeded, and when each value is determined to exceed the threshold value, a detection signal indicating that a person has been detected is transmitted to the communication network.

  The human detection method according to claim 8 is a human detection method including a master unit of a wireless LAN device and a plurality of slave units, wherein the master unit is a person detection device connected to a communication network. , Generate a signal, send the signal from the antenna, each slave unit receives the signal sent from the antenna by the antenna, converts the received signal to a voltage, and outputs a signal indicating the voltage Transmitting to the master unit, the master unit receives a signal transmitted from each slave unit, obtains a value indicating a time change of the voltage indicated by the signal, and from each value, a region where a person is present A value obtained from the information transmitted from the slave unit is selected, and a detection signal indicating that a person has been detected in the region of the slave unit that has transmitted a signal corresponding to the selected value is sent to the communication network. It sends out.

  ADVANTAGE OF THE INVENTION According to this invention, by using the electromagnetic wave from the main | base station of a wireless LAN apparatus to a subunit | mobile_unit, the more stable human detection apparatus can be provided, without being influenced by the surrounding radio wave environment change.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of a human detection device 1 according to the first embodiment.

  The human detection device 1 is installed indoors (for example, indoors), detects a person (for example, an intruder) indoors, and enables a user in the room to remotely know this. The human detection device includes a master unit 11 and a slave unit 12 of a wireless LAN device, and the master unit 11 is connected to the communication network 2.

  The base unit 11 includes a signal generation unit 101 that generates a signal, an antenna 102 that transmits the signal into the air, a reception unit 103 that receives a signal transmitted from the slave unit 12, and a time change of a voltage indicated by the signal. , A threshold value storage unit 105 that stores a threshold value Vth for the value Vd, a determination unit 106 that determines whether the value Vd exceeds the threshold value Vth, and a value Vd When it is determined that the threshold value Vth is exceeded, a detection signal transmission unit 107 that transmits a detection signal indicating that a person has been detected to the communication network 2 is provided.

  The generated signal does not have to be a special signal, and a signal necessary for the wireless LAN may be used.

  The subunit | mobile_unit 12 receives the signal sent from the antenna 102, the detection part 202 which converts the signal received by the antenna 201 into a voltage by detection, and the analog digital (henceforth "" A signal transmission that generates a signal indicating a voltage value obtained by digitizing a voltage converted from a signal received by the converter 203 and the antenna 201 and transmits the signal to the parent device 11 (abbreviated as “A / D”) Unit 204.

  Next, a human detection method performed by the human detection device 1 will be described.

  In base unit 11, signal generation unit 101 generates a signal, and antenna 102 transmits the signal indoors.

  In the slave unit 12, the antenna 201 receives the signal transmitted from the antenna 102. Next, the detection unit 202 converts the signal received by the antenna 201 into a voltage by detection. Next, the A / D conversion unit 203 digitizes the voltage. Next, the signal transmission unit 204 generates a signal indicating a voltage value obtained by digitizing the voltage converted from the signal received by the antenna 201 and transmits the signal from the antenna 201.

In base unit 11, antenna 102 receives a signal (radio wave) sent from antenna 201. FIG. 2 shows operations of receiving unit 103, calculation unit 104, determination unit 106, and detection signal sending unit 107 of base unit 11. It is a flowchart to show.

  In base unit 1, receiving section 103 receives a signal received by antenna 102 (step S1). Next, the calculation unit 104 calculates a value Vd indicating the time change of the voltage indicated by the signal (step S3). For example, if the voltage at time t is V (t) and the voltage at time t-1 prior to time t is V (t-1), the calculation unit 104 calculates the value Vd (t) at time t. Is calculated using the formula Vd (t) = | V (t) −V (t−1) |. The value Vd may be a time derivative of the voltage.

  Next, the determination unit 106 reads the threshold value Vth from the threshold value storage unit 105, and determines whether or not the value Vd exceeds the threshold value Vth (step S5). When it is determined that the value Vd exceeds the threshold value Vth (YES), the detection signal transmission unit 107 transmits a detection signal indicating that a person has been detected to the communication network 2 (step S7). When it is determined that the value Vd does not exceed the threshold value Vth (NO), or after step S7, it is determined whether a predetermined time has elapsed from that point (step S9). When it determines with NO, step S9 is repeated, and when it determines with YES, it returns to step S1.

  FIG. 3 is a diagram illustrating a change in the value Vd.

  Since the value Vd is obtained from a signal sent indoors, the value Vd is stable when there is no person in the room, but becomes unstable when there is a person.

  Therefore, as shown in FIG. 3, the value Vd is small, for example, in the time zone Tn when there is no person in the room. On the other hand, in the time zone Ty where there is a person in the room, for example, the value Vd increases. As a result, the value Vd exceeds the threshold value Vth, and a detection signal is transmitted. The detection signal is received by, for example, a computer connected to the communication network 2, so that a user in a room using the computer knows that there is a person (for example, an intruder) in the room.

  Next, a method for determining the threshold value Vth that is performed prior to the above human detection will be described.

  First, for example, the base unit 11 instructs the user with timing using sound or light, and causes the user to stop and move according to the timing. Further, the base unit 11 obtains a change in the value Vd as shown in FIG. In a time zone in which the user is stationary, the value Vd is small, for example, as in the time zone Tn. On the other hand, in the time zone in which the user is moving, the value Vd increases as in the time zone Ty. For example, base unit 11 calculates 70% of peak value Vdmax of fluctuating value Vd, and stores this in threshold storage unit 105 as threshold Vth.

  On this basis, if the person is detected as described above, if there is a person (for example, an intruder) in the room, the value Vd will not be at least 70% or less of the peak value Vdmax, so that the person can be detected. .

  Note that it is preferable that the threshold value Vth can be changed by the user, thereby preventing, for example, erroneous detection.

  As described above, according to the human detection device 1 of the first embodiment, by using the radio wave from the parent device 11 to the child device 12 of the wireless LAN device, it is not affected by changes in the surrounding radio wave environment, and more Stable human detection can be performed.

  According to the human detection device 1, the wireless LAN device includes the parent device 11 and the child device 12, the parent device 11 is connected to the communication network 2, and the parent device 11 generates a signal (signal generation unit 101). And an antenna 102 for transmitting a signal, means for receiving a signal transmitted from the slave unit 12 (receiving unit 103), and means for obtaining a value Vd indicating a time change of the voltage indicated by the signal (calculating unit 104) And means for determining whether or not the value Vd exceeds a preset threshold value Vth (determination unit 106), and if it is determined that the value Vd exceeds the threshold value Vth, that a person has been detected. Means for sending a detection signal to the communication network 2 (detection signal sending unit 107). The slave unit 12 receives an antenna 201 for receiving a signal sent from the antenna 102, and a voltage for the received signal. By having means for converting (detecting unit 202) and means for transmitting a signal indicating the voltage to base unit 11 (signal transmitting unit 204), a more stable person is not affected by changes in the surrounding radio wave environment. Can be detected.

  According to the human detection method performed by the human detection device 1, the base unit 11 generates a signal and transmits the signal from the antenna 102. The slave unit 12 receives the signal transmitted from the antenna 102 by the antenna 201. The received signal is converted into a voltage, and a signal indicating the voltage is transmitted to the parent device 11. The parent device 11 receives the signal transmitted from the child device 12, and changes the time change of the voltage indicated by the signal. A value Vd is obtained, and it is determined whether or not the value Vd exceeds a preset threshold value Vth. If it is determined that the value Vd exceeds the threshold value Vth, detection indicating that a person has been detected By sending a signal to the communication network 2, it is possible to perform more stable human detection without being affected by changes in the surrounding radio wave environment.

[Second Embodiment]
FIG. 4 is a schematic configuration diagram of a human detection device 1A according to the second embodiment. Since the human detection device 1A has the same parts as the parts constituting the human detection device 1 according to the first embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  The human detection device 1A includes a master unit 11A and a slave unit 12A, which are wireless LAN devices, and the master unit 11A is connected to the communication network 2.

  The base unit 11A includes a signal generation unit 101, an antenna 102, and a reception unit 103. Further, when the reception unit 103 receives a signal, the base unit 11A transmits a signal indicating that a person has been detected to the communication network 2. A signal transmission unit 107A is provided.

  Slave unit 12A includes antenna 201, detection unit 202, and A / D conversion unit 203, and indicates a time change of a voltage value obtained by digitizing a voltage converted from a signal received by antenna 201. A calculation unit 205 that calculates Vd, a threshold storage unit 206 that stores a threshold value Vth for the value Vd, a determination unit 207 that determines whether or not the value Vd exceeds the threshold value Vth, and a value Vd that sets the threshold value Vth. When it is determined that the number has exceeded, a signal transmission unit 208 that transmits a signal to the base unit 11 is provided.

  Next, a human detection method performed by the human detection device 1A will be described.

  In base unit 11, signal generation unit 101 generates a signal, and antenna 102 transmits the signal indoors.

  FIG. 5 is a flowchart showing the operation of the slave unit 12A.

  In the slave unit 12, the antenna 201 receives the signal (radio wave) transmitted from the antenna 102 (step S101). Next, the detection unit 202 converts the signal received by the antenna 201 into a voltage by detection (step S103). Next, the A / D conversion unit 203 digitizes the voltage (step S105). Next, the arithmetic unit 205 calculates a value Vd indicating a time change of the voltage value obtained by digitizing the voltage converted from the signal received by the antenna 201 (step S107). Next, the determination unit 207 reads the threshold value Vth from the threshold value storage unit 206, and determines whether or not the value Vd exceeds the threshold value Vth (step S109). When it is determined that the value Vd exceeds the threshold value Vth (YES), the signal transmission unit 208 transmits a signal from the antenna 201 (step S111). When it is determined that the value Vd does not exceed the threshold value Vth (NO), or after step S111, it is determined whether a predetermined time has elapsed from that point (step S113). If NO is determined, step S113 is repeated, and if YES is determined, the process returns to step S101.

  In base unit 11A, antenna 102 receives a signal (radio wave) transmitted from antenna 201. Next, the receiving unit 103 receives a signal received by the antenna 102. Thus, when the signal is received by the receiving unit 103, the detection signal sending unit 107A sends a signal indicating that a person has been detected to the communication network 2.

  The detection signal is received by, for example, a computer connected to the communication network 2, so that a user in a room using the computer knows that there is a person (for example, an intruder) in the room.

  The method for determining the threshold value Vth is the same as the method in the first embodiment.

  Further, it is preferable that the threshold value Vth can be changed by the user, as in the method in the first embodiment.

  As described above, according to the human detection device 1A of the second embodiment, by using the radio wave from the parent device 11A to the child device 12A of the wireless LAN device, it is not affected by changes in the surrounding radio wave environment, and more Stable human detection can be performed.

  According to the human detection device 1A, the wireless LAN device includes a master unit 11A and a slave unit 12A, the master unit 11A is connected to the communication network 2, and the master unit 11A generates a signal (signal generation unit 101). The communication network 2 sends a signal indicating that a person has been detected when receiving the signal, the antenna 102 for transmitting the signal, means for receiving the signal transmitted from the slave unit 12A (reception unit 103), and the signal. The slave unit 12A includes an antenna 201 that receives a signal transmitted from the antenna 102, and a unit that converts the received signal into a voltage (detection unit 202). And means for obtaining a value Vd indicating the time change of the voltage (calculation unit 205) and means for determining whether or not the value Vd exceeds a preset threshold value Vth (determination unit 207). When the value Vd is determined to exceed the threshold value Vth, by having a means (signal transmission unit 208) for transmitting a signal to the main unit 11A, it is not affected by changes in the surrounding radio wave environment. Stable human detection can be performed.

  According to the human detection method performed by the human detection device 1A, the master unit 11A generates a signal and sends the signal from the antenna 102. The slave unit 12A receives the signal sent from the antenna 102 by the antenna 201. The received signal is converted into a voltage, a value Vd indicating a time change of the voltage is obtained, it is determined whether the value Vd exceeds a preset threshold value Vth, and the value Vd exceeds the threshold value Vth. If the signal is transmitted from the slave unit 12A, the master unit 11A sends a signal indicating that a person has been detected to the communication network 2. Thus, more stable human detection can be performed without being affected by changes in the surrounding radio wave environment.

[Third Embodiment]
FIG. 6 is a schematic configuration diagram of a human detection device 1B according to the third embodiment. The human detection device 1B includes a plurality of child devices 12 of the human detection device 1 according to the first embodiment.

  The human detection device 1B includes a master unit 11 and a plurality of slave units 12 of a wireless LAN device, and the master unit 11A is connected to the communication network 2.

  The human detection method performed by the human detection device 1B differs from the human detection method performed by the human detection device 1 in the following points.

  The receiving unit 103 receives a signal (radio wave) transmitted from each slave unit 12. The arithmetic unit 104 calculates values Vd, Vd,... That indicate the time change of the voltage indicated by each signal. The determination unit 106 determines whether each value Vd, Vd,... Exceeds a threshold value Vth. When it is determined that each value Vd, Vd,... Exceeds the threshold value Vth, the detection signal transmission unit 107 transmits a detection signal to the communication network 2.

  For example, even if a single value Vd used in the first embodiment exceeds the threshold value Vth due to noise from outside the room, and thus erroneous detection is performed, a plurality of values Vd may be used depending on the noise. , Vd,... Will not exceed the threshold value Vth, so that the person is detected only when there is a person in the room and each value exceeds the threshold value Vth. Can be detected.

  The method for determining the threshold value Vth is the same as the method in the first embodiment.

  Further, it is preferable that the threshold value Vth can be changed by the user, as in the method in the first embodiment.

  Further, the threshold value Vth may be changed for each slave unit 12 instead of making the threshold value Vth common to each slave unit 12.

  As described above, according to the human detection device 1B of the third embodiment, by using the radio wave from the parent device 11 to the child device 12 of the wireless LAN device, it is not affected by changes in the surrounding radio wave environment, and more Stable human detection can be performed.

  According to the human detection device 1B, the wireless LAN device includes a master unit 11 and a plurality of slave units 12, and the master unit 11 is connected to the communication network 2, and the master unit 11 generates a signal (signal generation unit). 101), an antenna 102 for transmitting a signal, means for receiving a signal transmitted from each slave unit 12 (receiver 103), and values Vd, Vd,... , A means for determining whether each value Vd, Vd,... Exceeds a preset threshold value Vth (determination unit 106), and each value Vd, Vd,. When it is determined that Vth is exceeded, the slave unit 12 includes a means (detection signal transmission unit 107) for transmitting a detection signal indicating that a person has been detected to the communication network 2. Sent signal By having a receiving antenna 201, a means for converting a received signal into a voltage (detection unit 202), and a means for transmitting a signal indicating the voltage to the base unit 11 (signal transmission unit 204), More stable human detection is possible without being affected by changes in the radio wave environment.

  According to the human detection method performed by the human detection device 1B, the master unit 11 generates a signal and sends the signal from the antenna 102. Each slave unit 12 receives the signal sent from the antenna 102 by the antenna 201. The received signal is converted into a voltage, and a signal indicating the voltage is transmitted to the parent device 11. The parent device 11 receives the signal transmitted from each child device 12, and the voltage indicated by each signal is transmitted. A value Vd indicating a time change is obtained, and it is determined whether or not each value Vd, Vd,... Exceeds a preset threshold value Vth, and each value Vd, Vd,. In this case, a detection signal indicating that a person has been detected is sent to the communication network 2, and it is possible to perform more stable human detection without being affected by changes in the surrounding radio wave environment.

[Fourth Embodiment]
FIG. 7 is a diagram showing an arrangement of the human detection device 1C according to the fourth embodiment. The human detection device 1C includes a plurality of child devices 12 of the human detection device 1 according to the first embodiment.

  The human detection device 1 </ b> C includes a base unit 11 and a plurality of handset units 12 of a wireless LAN device, and the base unit 11 </ b> A is connected to the communication network 2. FIG. 7 shows that one of the two slave units 12 is between 6 tatami mats and the other is between 8 tatami mats.

  The human detection method performed by the human detection device 1C is different from the human detection method performed by the human detection device 1 in the following points.

  The receiving part 103 receives the signal (radio wave) transmitted from each subunit | mobile_unit 12 between 6 tatami mats and 8 tatami mats, for example. The calculation unit 104 calculates a value Vd indicating the time change of the voltage indicated by each signal. FIG. 8 is a diagram illustrating changes in two values Vd.

  When there is a person between 8 tatami mats and no person between 6 tatami mats, Vd8 which is a value Vd obtained by a signal transmitted from the slave unit 12 between the 8 tatami mats is the slave unit 12 between the 6 tatami mats. Vd6, which is a value Vd obtained from the signal transmitted from.

  Therefore, the determination unit 106 selects the value Vd8 in the case shown in FIG. 8 by comparing the values. Then, the detection signal transmission unit 107 transmits a detection signal indicating that a person has been detected in the area of the child device that has transmitted the signal corresponding to the selected value to the communication network 2. The detection signal sending unit 107 includes, for example, a room name indicating between 8 tatami mats where people are present in the detection signal.

  The detection signal is received, for example, by a computer connected to the communication network 2, whereby the user who uses the computer knows that there is a person (for example, an intruder) between 8 tatami mats.

  In the fourth embodiment, the threshold value Vth may be used. That is, the determination unit 106 reads the threshold value Vth from the threshold value storage unit 105, determines whether each value Vd exceeds the threshold value Vth, and determines that any value Vd exceeds the threshold value Vth The value Vd is selected, and the detection signal sending unit 107 sends a detection signal indicating that a person has been detected in the area of the slave unit that has transmitted the signal corresponding to the selected value to the communication network 2. May be. The method for determining the threshold value Vth is the same as the method in the first embodiment.

  Further, it is preferable that the threshold value Vth can be changed by the user, as in the method in the first embodiment.

  Further, the threshold value Vth may be changed for each slave unit 12 instead of making the threshold value Vth common to each slave unit 12.

  In the fourth embodiment, even if the values are compared or the threshold value is used, that is, the value obtained by the information transmitted from the slave unit in the area where the person is present is selected. What is necessary is just to send the detection signal which shows that the person was detected in the area | region of the subunit | mobile_unit which transmitted the signal corresponding to the selected value.

  As described above, according to the human detection device 1C of the fourth embodiment, by using the radio wave from the master unit 11 to the slave unit 12 of the wireless LAN device, the change is not affected by the surrounding radio wave environment. Stable human detection can be performed.

  According to the human detection device 1C, the wireless LAN device includes a parent device 11 and a plurality of child devices 12, and the parent device 11 is connected to the communication network 2, and the parent device 11 generates a signal (signal generation unit). 101), an antenna 102 for transmitting a signal, means for receiving a signal transmitted from each slave unit 12 (receiving unit 103), and values Vd, Vd,... Obtaining means (arithmetic unit 104), means (selection unit 106) for selecting a value Vd obtained from information Vd, Vd,... A means (detection signal sending unit 107) for sending a detection signal indicating that a person has been detected in the area of the handset that has transmitted a signal corresponding to the selected value to the communication network 2; From the antenna 102 An antenna for receiving the output signal, means for converting the received signal into a voltage (detection unit 202), and means for transmitting a signal indicating the voltage to the main unit 11 (signal transmission unit 204) Therefore, more stable human detection can be performed without being affected by changes in the surrounding radio wave environment.

  According to the human detection method performed by the human detection device 1 </ b> C, the base unit 11 generates a signal and sends the signal from the antenna 102. Each slave unit 12 receives the signal sent from the antenna 102 by the antenna 201. The received signal is converted into a voltage, and a signal indicating the voltage is transmitted to the parent device 11. The parent device 11 receives the signal transmitted from each child device 12, and the time of the voltage indicated by the signal is received. Obtain values Vd, Vd,... Indicating change, and select a value Vd obtained from information transmitted from the slave unit in the area where the person is present from the values Vd, Vd,. By sending a detection signal to the communication network 2 indicating that a person has been detected in the area of the slave unit that has transmitted a signal corresponding to Vd, more stable human detection is not affected by changes in the surrounding radio wave environment. Can be done.

It is a schematic structure figure of human detection device 1 concerning a 1st embodiment. 3 is a flowchart showing operations of a receiving unit 103, a calculation unit 104, a determination unit 106, and a detection signal transmission unit 107 of the parent device 11. It is the figure which illustrated change of value Vd. It is a schematic block diagram of the human detection apparatus 1A which concerns on 2nd Embodiment. It is a flowchart which shows operation | movement of the subunit | mobile_unit 12A. It is a schematic block diagram of the human detection apparatus 1B which concerns on 3rd Embodiment. It is the figure which showed arrangement | positioning of 1 C of human detection apparatuses which concern on 4th Embodiment. It is the figure which illustrated change of two values Vd.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C ... Human detection apparatus 11, 11A ... Base unit 12, 12A ... Slave unit 101 ... Signal generation part 102, 201 ... Antenna 103 ... Reception part 104, 205 ... Calculation part 105 ... Threshold storage part 106, 207: Determination unit 107, 107A ... Detection signal transmission unit 201 ... Antenna 202 ... Detection unit 203 ... A / D conversion unit 204, 208 ... Signal transmission unit 206 ... Threshold storage unit

Claims (8)

A wireless LAN device including a parent device and a child device, and the parent device is connected to a communication network;
The base unit is
Means for generating a signal; antenna for transmitting the signal; means for receiving the signal transmitted from the slave; means for obtaining a value indicating a time change of the voltage indicated by the signal; Means for determining whether or not a set threshold is exceeded, and means for sending a detection signal indicating that a person has been detected to the communication network when it is determined that the value exceeds the threshold. Have
The slave is
A human detection apparatus comprising: an antenna that receives a signal transmitted from the antenna; a unit that converts the received signal into a voltage; and a unit that transmits a signal indicating the voltage to the parent device. . A wireless LAN device including a parent device and a child device, and the parent device is connected to a communication network;
The base unit is
A means for generating a signal; an antenna for transmitting the signal; a means for receiving a signal transmitted from the slave; and a signal indicating that a person has been detected when the signal is received. Means for sending to
The slave is
An antenna for receiving a signal transmitted from the antenna, a means for converting the received signal into a voltage, a means for obtaining a value indicating a time change of the voltage, and the value exceeds a preset threshold value And a means for transmitting a signal to the parent device when it is determined that the value exceeds a threshold value. The wireless LAN device includes a master unit and a plurality of slave units, and the master unit is connected to a communication network,
The base unit is
Means for generating a signal; an antenna for transmitting the signal; means for receiving a signal transmitted from each of the slave units; means for obtaining a value indicating a time change of a voltage indicated by each signal; A means for determining whether or not a value exceeds a preset threshold value, and when it is determined that each value exceeds the threshold value, a detection signal indicating that a person has been detected is sent to the communication network. And means for
Each slave unit is
A human detection apparatus comprising: an antenna that receives a signal transmitted from the antenna; a unit that converts the received signal into a voltage; and a unit that transmits a signal indicating the voltage to the parent device. . The wireless LAN device includes a master unit and a plurality of slave units, and the master unit is connected to a communication network,
The base unit is
Means for generating a signal; antenna for transmitting the signal; means for receiving a signal transmitted from each of the slave units; means for obtaining a value indicating a time change of a voltage indicated by the signal; From this, it is confirmed that a person has been detected in the area of the slave unit that has transmitted a signal corresponding to the selected value, and means for selecting a value obtained from information transmitted from the slave unit in the region where the person is present. Means for transmitting a detection signal indicating to the communication network,
Each slave unit is
A human detection apparatus comprising: an antenna that receives a signal transmitted from the antenna; a unit that converts the received signal into a voltage; and a unit that transmits a signal indicating the voltage to the parent device. . The wireless LAN device includes a master device and a slave device, and the master device is a human detection method performed by a human detection device connected to a communication network,
The base unit is
Generate a signal, send the signal out of the antenna,
The slave is
A signal transmitted from the antenna is received by the antenna, the received signal is converted into a voltage, and a signal indicating the voltage is transmitted to the parent device,
The base unit is
A signal transmitted from the slave unit is received, a value indicating a time change of the voltage indicated by the signal is obtained, it is determined whether or not the value exceeds a preset threshold value, and the value is a threshold value. When it is determined that the number exceeds, a detection signal indicating that a person has been detected is sent to the communication network.
A human detection method characterized by that. The wireless LAN device includes a master device and a slave device, and the master device is a human detection method performed by a human detection device connected to a communication network,
The base unit is
Generate a signal, send the signal out of the antenna,
The slave is
Whether the signal transmitted from the antenna is received by the antenna, the received signal is converted into a voltage, a value indicating a time change of the voltage is obtained, and whether or not the value exceeds a preset threshold value When it is determined that the value exceeds the threshold value, a signal is transmitted to the parent device.
When a signal transmitted from the slave is received, a signal indicating that a person has been detected is sent to the communication network.
A human detection method characterized by that. A wireless LAN device comprising a master device and a plurality of slave devices, wherein the master device is a human detection method performed by a human detection device connected to a communication network,
The base unit is
Generate a signal, send the signal out of the antenna,
Each slave unit is
A signal transmitted from the antenna is received by the antenna, the received signal is converted into a voltage, and a signal indicating the voltage is transmitted to the parent device,
The base unit is
Receiving the signal transmitted from each slave unit, obtaining a value indicating the time change of the voltage indicated by each signal, determining whether each value exceeds a preset threshold, When it is determined that each value exceeds the threshold, a detection signal indicating that a person has been detected is sent to the communication network.
A human detection method characterized by that. A wireless LAN device comprising a master device and a plurality of slave devices, wherein the master device is a human detection method performed by a human detection device connected to a communication network,
The base unit is
Generate a signal, send the signal out of the antenna,
Each slave unit is
A signal transmitted from the antenna is received by the antenna, the received signal is converted into a voltage, and a signal indicating the voltage is transmitted to the parent device,
The base unit is
Receives the signal transmitted from each slave unit, obtains a value indicating the time change of the voltage indicated by the signal, and obtains from each value the information transmitted from the slave unit in the area where the person is present. Sending a detection signal to the communication network indicating that a person has been detected in the area of the slave unit that has transmitted a signal corresponding to the selected value.
A human detection method characterized by that.

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