JP2012190161A - Event detection device, event detection system, event detection method, and event detection program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an event detection device which can surely perform event detection.SOLUTION: The event detection device is an event detection device as a master unit 100 for detecting an event in a predetermined area, and includes a mode setting section 145 which sets any of plural event detection modes corresponding to the kind of the event and determines detection conditions for the event according to the set event detection mode, and a detection processing section 140 which detects the occurrence of the event based on the detection condition.

Description

  The present invention relates to an event detection device, an event detection system, an event detection method, and an event detection program. In particular, an event detection device that can be used for crime prevention purposes, watching over elderly people, and the like is assumed to be applied to, for example, a cordless telephone system in a home.

  For example, when an elderly person living alone becomes sick and cannot move alone at home, there is no way to help because no one else knows the situation. Elderly people are more likely to fall, and there is a high risk that they will break when they fall and become unable to move on the spot. Furthermore, if a single elderly person becomes unable to move due to a fall, he / she cannot call for help. If this discovery is delayed, the worst case may be death.

  On the other hand, considering the environment of elderly people's homes, there are many cases where special communication lines such as the Internet (ADSL line, optical line) are not introduced, and the means for transmitting information to the outside is often only a telephone line. . Also, monitoring with a surveillance camera is a violation of privacy and may be disliked by the elderly. In addition, the location of mobile phone terminals is basically not limited, it can be placed in various places (such as in a bag), and the battery may run out. not appropriate.

  Therefore, a special event detection system suitable for watching elderly people living alone is desired. There is also a demand for an event detection system capable of monitoring a crime prevention purpose in an answering house, for example, not only watching an elderly person living alone.

  As a conventional technique applicable to this type of event detection, for example, techniques disclosed in Patent Document 1 and Non-Patent Document 1 are known.

  In Patent Document 1, a radio wave transmitted by a transmitter is received by a plurality of antennas, a correlation matrix is calculated using the received signal as a reception vector, and an eigenvector that expands the eigenvalues of this correlation matrix to expand a signal subspace is calculated. And detecting an event from a change in eigenvector with time.

  Non-Patent Document 1 discloses that, as in Patent Document 1, by detecting eigenvectors, it is possible to detect changes in the way in which radio waves are spatially transmitted, and to detect changes due to opening and closing of doors and intrusions by people. Yes. Non-Patent Document 1 refers to the possibility of installing one transmitter indoors, using a wireless LAN access point, or using a broadcast wave as a radio wave transmission source.

  A method of detecting the occurrence of an event based on the radio wave reception intensity is also conceivable. However, in this case, since it is affected by noise generated by other devices, erroneous detection is likely to occur. Therefore, it is desirable to detect events using eigenvectors as in Patent Document 1 and Non-Patent Document 1.

JP 2008-216152 A

Tomoaki Ohtsuki, "Radio wave security system based on spatio-temporal signal processing", [online], [March 4, 2011 search] Internet <http://www.mod.go.jp/trdi/research/S1/S1 -5.pdf>

  However, even when the event is detected using the eigenvector as in the techniques disclosed in Patent Document 1 and Non-Patent Document 1, in some cases, erroneous detection may actually occur. In particular, when an event is detected for each of a plurality of uses, the frequency of erroneous detection tends to increase. For example, when an event is detected by a common method for a plurality of situations such as the intrusion of a person into an answering house or the watching of an elderly person, a false detection often occurs.

  It is an object of the present invention to provide an event detection device, an event detection system, an event detection method, and an event detection program that can reliably detect an event for each of a plurality of types of situations.

  The event detection device of the present invention is an event detection device that detects an event in a predetermined area, and includes a mode specification unit that specifies one of a plurality of event detection modes corresponding to the type of event, and the mode specification unit. A detection condition determining unit that determines an event detection condition according to a specified event detection mode, and an event detection unit that detects the occurrence of an event based on the detection condition determined by the detection condition determining unit.

  According to this event detection device, since the occurrence of an event can be detected using the optimum detection condition for each designated event detection mode, the occurrence of erroneous detection can be suppressed for each event detection mode. Therefore, event detection can be reliably performed.

  In the event detection device of the present invention, when the mode specifying unit specifies the first event detection mode, the event detecting unit detects that an event has occurred when there is a change in the environment in the area. When the mode specifying unit specifies the second event detection mode, the event detecting unit is configured to detect that an event has occurred when there is no change in the environment in the area for a predetermined time. The

  According to this event detection device, different events can be detected under detection conditions suitable for each event detection mode.

  In addition, the event detection apparatus of the present invention includes a transmission unit that transmits a predetermined message to a predetermined contact via a communication line when the event detection unit detects that an event has occurred.

  According to this event detection device, when an abnormal situation occurs as an event, the event occurrence status can be notified to a specific party (system administrator, family, etc.) located away from the detection point. it can.

  In addition, the event detection device of the present invention includes a reception unit that receives radio waves from other communication devices, and the event detection unit detects occurrence of an event based on the radio waves received by the reception unit. Composed.

  According to this event detection device, it is possible to detect the occurrence of an event using a radio wave emitted when an event occurs around another communication device.

  In the event detection device of the present invention, the event detection unit detects a radio wave propagation environment in the area from a signal included in the radio wave received by the reception unit, and the event detection unit detects an event based on the radio wave propagation environment. Configured to detect occurrences.

  According to this event detection device, the occurrence of an event can be detected based on the radio wave propagation environment that changes due to the occurrence of the event.

  In the event detection device of the present invention, the event detection unit acquires eigenvector information including information on the arrival direction of the radio wave in the area as the radio wave propagation environment from a signal included in the radio wave generated by the reception unit. The occurrence of an event is detected based on the eigenvector information.

  According to this event detection apparatus, since eigenvector information is used, it becomes difficult to be affected by noise generated by other devices, and the reliability of event detection is improved.

  Moreover, the event detection device of the present invention is configured such that the event detection unit detects an acoustic signal generated in the area and detects the occurrence of an event based on the eigenvector information and the acoustic signal. .

  According to this event detection apparatus, since event detection is performed using not only eigenvector information but also an acoustic signal, it is difficult to detect errors. For example, when there is no possibility of sound being generated in the area, event detection can be performed more reliably by acquiring eigenvector information triggered by the sound generation.

  In the event detection device of the present invention, when the mode specifying unit specifies the first event detection mode, the event detecting unit acquires the eigenvector information as reference vector information, and after acquiring the reference vector information Obtaining first eigenvector information, calculating an evaluation value for detecting the occurrence of an event based on the reference vector information and the first eigenvector information, and when the evaluation value is equal to or less than a predetermined threshold, It is configured to detect that it has occurred.

  According to this event detection apparatus, when the first event detection mode is designated, reference vector information is newly acquired, and the evaluation value is calculated using this as a reference. Therefore, for example, whether or not a person is present when the first event detection mode is entered, the change from the situation is evaluated, and event detection is reliably performed. be able to.

Further, the event detection device of the present invention is configured such that the event detection unit starts acquiring the first eigenvector information when the signal level of the acoustic signal is equal to or higher than a predetermined level.

  According to this event detection device, it is possible to recognize the possibility of occurrence of an abnormality as an event based on the signal level of the detected acoustic signal, and only when the possibility of occurrence of an abnormality becomes high Detection can be performed.

  In the event detection device of the present invention, when the mode specifying unit specifies the second event detection mode, the event detecting unit acquires the first eigenvector information and is acquired as the reference vector information Calculating a first evaluation value for identifying whether or not an event has occurred based on eigenvector information and the first eigenvector information; obtaining second eigenvector information after obtaining the first eigenvector information; A second evaluation value is calculated based on reference vector information and the second eigenvector information, and a state in which a difference between the second evaluation value and the first evaluation value is equal to or less than a predetermined threshold continues for a predetermined time. If so, the event is configured to be detected.

  According to this event detection apparatus, the occurrence of an event is evaluated based on a change with elapse of time of eigenvector information. Therefore, for example, it is possible to detect an abnormal situation such as a situation where a person has stopped moving after falling down as an event.

  In the event detection device of the present invention, the event detection unit acquires the first eigenvector information when the signal level of the acoustic signal is equal to or higher than a predetermined level and the acoustic signal indicates a falling sound. Configured to start.

  According to this event detection device, it is possible to recognize the possibility of occurrence of an abnormality as an event based on the signal level and characteristics (sound quality) of the detected acoustic signal, and when the possibility of occurrence of an abnormality has increased Only the event detection can be performed reliably.

  Moreover, the event detection apparatus of this invention is provided with the transmission part which transmits the electromagnetic wave transmission instruction | indication signal for instruct | indicating transmission of an electromagnetic wave with respect to the said other communication apparatus.

  According to this event detection apparatus, since it is possible to instruct to stop transmission of radio waves except when an event detection operation is actually required, useless energy consumption can be suppressed.

  Further, in the event detection device of the present invention, the event detection unit sets an automatic incoming call ON state in which incoming processing is performed for an incoming call from another communication device after a message is transmitted by the transmission unit. Configured.

  According to this event detection device, if the monitoring target person in the area cannot move, but is conscious, it becomes a state in which a call can be automatically made with an incoming call from another communication device, You can ask for help from the other party.

  The event detection device of the present invention is an event detection device that detects an event in a predetermined area, and includes a reception unit that receives radio waves from other communication devices, and a plurality of event detection modes corresponding to the type of event. Based on the detection condition determined by the detection condition determination unit, a detection condition determination unit that determines a detection condition of an event according to the event detection mode specified by the mode specification unit, and a detection condition determined by the detection condition determination unit And an event detection unit that detects the occurrence of the event based on the radio wave received by the receiving unit.

  According to this event detection device, since the occurrence of an event can be detected using the optimum detection condition for each designated event detection mode, the occurrence of erroneous detection can be suppressed for each event detection mode. Therefore, event detection can be reliably performed. Furthermore, the occurrence of an event can be detected using a radio wave emitted when an event occurs around another communication device.

  Moreover, the event detection apparatus of this invention is comprised so that the said mode designation | designated part may be a mode input part which a user can input.

  According to this event detection device, the event detection mode intended by the user can be selected.

  An event detection system according to the present invention is an event detection system for detecting an event in a predetermined area by performing communication between a first communication device and a second communication device, the first communication device. A mode designation unit that designates one of a plurality of event detection modes corresponding to the type of event, a detection condition decision unit that decides an event detection condition according to the event detection mode designated by the mode designation unit, An event detection unit that detects occurrence of an event based on the detection condition determined by the detection condition determination unit, and the second communication device operates according to the event detection mode specified by the mode specification unit To do.

  According to this event detection system, radio waves can be transmitted and received using a wireless communication function between communication devices, so that radio wave propagation in a predetermined area from a signal received by the first communication device from the second communication device. Understand changes in the situation. In addition, since occurrence of an event can be detected using an optimum detection condition for each specified event detection mode, occurrence of erroneous detection can be suppressed for each event detection mode. Therefore, event detection can be reliably performed.

  The event detection method of the present invention is an event detection method for detecting an event in a predetermined area, the step of specifying any of a plurality of event detection modes corresponding to the type of event, and the specified And determining an event detection condition according to the determined event detection mode, and detecting an event occurrence based on the determined detection condition.

  According to this event detection method, the occurrence of an event can be detected using an optimum detection condition for each specified event detection mode, so that the occurrence of erroneous detection can be suppressed for each event detection mode. Therefore, event detection can be reliably performed.

  Moreover, the event detection program of this invention is a program for making a computer perform each step of the said event detection method.

  According to this event detection program, event detection can be reliably performed. That is, since occurrence of an event can be detected using an optimum detection condition for each specified event detection mode, occurrence of erroneous detection can be suppressed for each event detection mode.

  According to the present invention, it is possible to reliably detect an event.

The figure which shows the outline of the event detection system in embodiment of this invention The perspective view which shows an example of the external appearance of the main | base station of the event detection system in embodiment of this invention The perspective view which shows an example of the external appearance of the subunit | mobile_unit of the event detection system in embodiment of this invention FIG. 2 is a block diagram showing an example of the hardware configuration of the parent device in the embodiment of the present invention. The block diagram which shows the structural example of the hardware of the subunit | mobile_unit in embodiment of this invention The block diagram which shows the functional structure regarding the detection process part of the main | base station in embodiment of this invention The block diagram which shows the functional structure regarding the detection process part of the subunit | mobile_unit in embodiment of this invention The flowchart which shows a part of main operation example (operation example of crime prevention mode) of the main | base station and the subunit | mobile_unit in embodiment of this invention The flowchart which shows a part of main operation example (operation example of watching mode) of the main | base station and the subunit | mobile_unit in embodiment of this invention The flowchart which shows the operation example at the time of acquisition of the reference | standard vector information of the main | base station and a subunit | mobile_unit in embodiment of this invention The flowchart which shows the modification (modification operation example of watching mode) of operation | movement of the main | base station and the subunit | mobile_unit in embodiment of this invention The graph which shows the 1st example of the change of the evaluation value P (t) corresponding to the change of the electromagnetic wave propagation environment in embodiment of this invention. The graph which shows the 2nd example of the change of the evaluation value P (t) corresponding to the change of the electromagnetic wave propagation environment in embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  An outline of the event detection system of this embodiment is shown in FIG. In the present embodiment, a cordless telephone system including the parent device 100, the child device 200, and the child device 300 is a main component of the event detection system. Note that the parent device 100 refers to an event detection device that functions as a parent device. Moreover, the subunit | mobile_unit 200,300 points out the event detection apparatus which functions as a subunit | mobile_unit. The parent device 100 manages the child devices 200 and 300.

  In the configuration example shown in FIG. 1, assuming that the parent device 100 and the child devices 200 and 300 are installed indoors in a single-person elderly home 700 and the system watches the person 800 to be watched by the elderly and the like. Yes. In addition, this event detection system is not limited to the watching operation, and can detect an intrusion of another person into the answering house. Moreover, you may abbreviate | omit about any one of the subunit | mobile_unit 200,300.

  Since the event detection system of this embodiment is a cordless telephone system, for example, wireless communication can be performed between the parent device 100 and the child devices 200 and 300. Therefore, the parent device 100 and the child devices 200 and 300 have a function as a communication device. In this embodiment, an indoor radio wave propagation environment is detected by receiving radio waves transmitted from the slave units 200 and 300 by the array antenna 101 of the master unit 100. It is configured to be able to detect the occurrence of an event related to the intrusion of a person. In the present embodiment, an event is a special state (abnormal situation) in an area that cannot normally occur or the presence or absence of an environmental change in an area caused by, for example, a person or an object. The area where these events are detected is, for example, a house or an office, and is not particularly limited.

  Base unit 100 is connected to a public communication network as a communication line via telephone line 400 in the same manner as a general telephone. Therefore, base unit 100 can call and communicate with any other party via a telephone exchange. Further, a communication line can be connected to the family 900 carrying the mobile phone terminal 600 via the base station 500.

  Examples of external appearances of the parent device 100 and the child device 200 of the system shown in FIG. 1 are shown in FIGS. 2 and 3, respectively. The slave unit 300 is the same as the slave unit 200.

  As shown in FIG. 2, base unit 100 includes array antenna 101, microphone 102, speaker 103, operation unit 110, and display unit 120. The operation unit 110 includes an answering button 104.

  In the present embodiment, an answering button 104 as a mode input unit is used for an operation in which the user designates one of a watch mode and a security mode, which will be described later, as the event detection mode. Note that the mode input unit does not necessarily have to be provided in the parent device 100 like the answering button 104, and may be a remote-controllable device such as a remote controller or a mobile phone terminal. The array antenna 101 is used to identify the arrival direction of the radio wave received by the parent device 100.

  As shown in FIG. 3, the handset 200 includes an antenna 201, a microphone 202, a speaker 203, an operation unit 210, and a display unit 220.

Next, an example of the hardware configuration of base unit 100 is shown in FIG.
As shown in FIG. 4, base unit 100 includes operation unit 110, display unit 120, control unit 130, audio unit 150, radio unit 160, power supply unit 170, and interface unit (I / F unit) 180.

  The control unit 130 is configured by a control circuit mainly including a microcomputer, and realizes a function as a base unit of the cordless telephone system by executing a program prepared in advance. Further, the control unit 130 includes a detection processing unit 140 necessary for performing event detection.

  The operation unit 110 includes various buttons such as a numeric keypad, and accepts an input operation from the user. For example, an event detection mode (security mode or watching mode) is designated by operating the answering button 104 included in the operation unit 110.

  Display unit 120 displays the operating state of base unit 100 and information such as the telephone number of the other party. Thereby, necessary information can be notified to the user. The audio unit 150 captures and inputs an acoustic signal such as voice from the microphone 102, reproduces the received acoustic signal, and outputs it to the speaker 103.

  The wireless unit 160 transmits and receives radio waves via the array antenna 101 and performs wireless communication with the slave unit 200. The radio wave signal received by the array antenna 101 is used for event detection.

  The power supply unit 170 receives power from an AC power supply or a DC power supply, and supplies power to other components in the parent device 100.

  Interface unit 180 is used to connect base unit 100 to a public communication network via telephone line 400 and perform a voice call with an external telephone.

Next, a hardware configuration example of the slave unit 200 is shown in FIG.
As shown in FIG. 5, handset 200 includes an operation unit 210, a display unit 220, a control unit 230, an audio unit 250, a radio unit 260, and a power supply unit 270.

  The control unit 230 is configured by a control circuit mainly including a microcomputer, and realizes a function as a slave unit of the cordless telephone system by executing a program prepared in advance. Further, the control unit 230 includes a detection processing unit 240 necessary for performing event detection.

  The operation unit 210 includes various buttons such as a numeric keypad, and accepts an input operation from the user. The display unit 220 displays the operation state of the child device 200 and displays information such as the telephone number of the other party. Thereby, necessary information can be notified to the user. The audio unit 250 captures and inputs an acoustic signal such as voice from the microphone 202, reproduces the received acoustic signal, and outputs it to the speaker 203.

  The wireless unit 260 transmits and receives radio waves via the antenna 201 and performs wireless communication with the parent device 100. The radio wave signal transmitted by the antenna 201 is used for event detection. The power supply unit 270 receives power supply from an AC power supply or a DC power supply, and supplies power to other components in the slave unit 200.

Next, a detailed configuration of the detection processing unit 140 on the parent device 100 side will be described.
An example of a functional configuration related to the detection processing unit 140 on the base unit 100 side is shown in FIG.

  As shown in FIG. 6, the detection processing unit 140 on the parent device 100 side includes an eigenvector calculation unit 141, a sound volume detection unit 142, an event detection unit 143, a child device communication unit 144, a mode setting unit 145, and a message transmission instruction unit 146. Is provided.

  The eigenvector calculation unit 141 inputs a radio wave signal received by the array antenna 101 from the radio unit 160 and calculates an eigenvector. The signal output from the array antenna 101 includes information on the received signal strength and the arrival direction of the radio wave. However, the received signal strength is likely to change with time even if the state of the object in the space does not change. Therefore, by eigenvalue expansion of the correlation matrix of the received data obtained as the output of the array antenna 101, only eigenvector components representing the arrival direction of radio waves are acquired (extracted).

  This eigenvector reflects the radio wave propagation environment in the detection target space (for example, the space in the living alone home 700). Therefore, it is possible to distinguish between a state where an object such as a person is moving and a state where it is not moving in the detection target space based on the eigenvector.

  The sound volume detection unit 142 receives an acoustic signal collected by the microphone 102 from the audio unit 150 and detects a special acoustic signal generated in association with the occurrence of the event. For example, a loud sound whose sound pressure (signal level of the sound signal) is equal to or higher than a predetermined level or an acoustic signal having a fall sound characteristic (sound quality) is detected.

  The characteristics of the falling sound here are, for example, the type of sound, and the type of sound for detecting the falling sound is not a pure sound or a musical sound, but corresponds to a sound of breaking things, a sound of hitting, a hitting sound, etc. It is a roaring sound. In addition, when the person 800 to be watched over falls alone in the elderly living alone 700, it is unlikely that repeated falling sounds will occur. Therefore, it is determined that a falling sound is detected by detecting a single or sudden stuttering noise. It is desirable to do.

  Moreover, you may judge whether it is a fall sound using the frequency of the detected acoustic signal. For example, it may be determined that a falling sound occurs when the center frequency of the detected acoustic signal is 125 Hz or less, or the duration of the low frequency component of the detected acoustic signal is long and the duration of the high frequency component of the detected acoustic signal May be determined to be a fall sound.

  The mode setting unit 145 switches the event detection mode according to an operation input such as the absence button 104 of the operation unit 110. In the present embodiment, for example, “watch mode” and “crime prevention mode” are switched. The event detection mode corresponds to the type of event (such as an event that someone has entered the area or an event that a person has not moved for a long time). Then, mode setting unit 145 determines a detection condition for detecting an event according to the event detection mode.

  The event detection unit 143 detects the occurrence of an event according to the detection condition assigned to the event detection mode specified by the mode setting unit 145. That is, whether or not an event has occurred is identified. For example, the presence / absence of an event is identified based on the characteristic of the eigenvector acquired by the eigenvector computing unit 141. Further, for example, the presence / absence of an event is identified based on the characteristic of the detected acoustic signal and the characteristic of the eigenvector acquired by the eigenvector computing unit 141.

  At this time, the event detection unit 143 stores the information of the acoustic signal sampled in advance in the internal memory for the characteristics of the acoustic signal, and collects the characteristics of the stored acoustic signal and the microphone 102 or the like newly. The relationship with the occurrence of the event is identified by examining the similarity to the characteristics of the acoustic signal.

  The slave unit communication unit 144 performs processing related to communication between the master unit 100 and the slave unit 200. For example, the slave device 200 is instructed to the current event detection mode according to the event detection mode specified by the mode setting unit 145. Also, when necessary, a radio wave transmission instruction signal for instructing the slave unit 200 to start radio wave transmission is transmitted. In addition, the information on the acoustic signal collected by the handset 200 on the microphone 202 is received and delivered to the event detection unit 143.

  When the event detection unit 143 detects an event occurrence, the message transmission instruction unit 146 responds to the telephone number of the other party (for example, the mobile phone terminal 600 owned by the family 900) registered in advance in the memory or the like. A call is made, and a voice message recorded and stored in the base unit 100 in advance in a memory or the like is transmitted as a voice signal via a connected telephone line.

Next, a detailed configuration of the detection processing unit 240 on the slave device 200 side will be described.
An example of a functional configuration related to the detection processing unit 240 on the slave device 200 side is shown in FIG.

  As shown in FIG. 7, the detection processing unit 240 on the side of the child device 200 includes a radio wave transmission instruction unit 241, a volume detection unit 242, and a parent device communication unit 243.

  The radio wave transmission instructing unit 241 instructs the radio unit 260 of the slave unit 200 to transmit a radio wave when an instruction for radio wave transmission is received from the parent device 100, that is, when a radio wave transmission instruction signal for event detection is received. Put out.

  The sound volume detection unit 242 inputs the sound signal collected by the microphone 202 via the audio unit 250 and detects a sound larger than a predetermined sound volume, that is, when the signal level of the sound signal is equal to or higher than a predetermined level. The sound data is transferred to the event detection unit 143 of the parent device 100 via the parent device communication unit 243.

  Base unit communication unit 243 transmits the sound data (volume data, sound quality data, etc.) input from volume detection unit 242 to base unit 100. Further, when an instruction is issued from the parent device 100, the event detection mode is switched in accordance with the instruction. That is, the slave device 200 is controlled to operate according to the event detection mode set by the mode setting unit 145 of the master device 100.

  Next, operations of parent device 100 and child device 200 related to event detection will be described. Main operations of the parent device 100 and the child device 200 in the present embodiment are shown in FIGS. 8 to 10, the microcomputer of the control unit 130 on the parent device 100 side or the microcomputer of the control unit 230 on the child device 200 side executes a program prepared in advance. The operation of the detection processing unit 140 or 240 is realized. Further, the child device 300 can perform the same operation as the child device 200.

  In the base unit 100, when the power is turned on and the detection processing unit 140 is activated, the process proceeds from step S11 to step S12 in FIG. In the slave unit 200, when the power is turned on and the detection processing unit 240 is activated, the process proceeds from step S31 to step S32 in FIG.

  The detection processing unit 140 of the parent device 100 switches the signal input from the microphone 102 to the on state (step S12). In addition, the detection processing unit 240 of the slave device 200 switches the signal input from the microphone 202 to the on state (step S32).

  Subsequently, in order to set the event detection mode, the detection processing unit 140 of the parent device 100 identifies whether or not the answering button 104 of the parent device 100 is pressed (step S13). If pressing of the answering button 104 is detected, it is regarded as “security mode” designation, and the process proceeds to step S14. If pressing of the answering button 104 is not detected, it is regarded as designation of “watching mode”. The process proceeds to step S41 of FIG.

  Here, the “crime prevention mode” is an event detection mode for detecting an intrusion of a person such as a thief as an event in the absence home where the parent device 100 and the child devices 200 and 300 are installed during absence. In addition, the “watching mode” indicates that the person who is watching over, such as an elderly person living alone, cannot move due to a fall or the like in the home where the parent device 100 or the child device 200 or 300 is installed, and needs to be rescued. This is an event detection mode for detecting an event.

  When “security mode” is designated, the detection processing unit 140 of the parent device 100 transmits a mode instruction signal from the parent device 100 to the child device 200 in order to set the child device 200 to the “security mode” (step S100). S14). In this case, the detection processing unit 240 of the child device 200 activates the operation of “crime prevention mode” in accordance with the mode instruction signal received from the parent device 100 (step S33).

  Steps S14 to S24 shown in FIG. 8 are processing of the detection processing unit 140 related to the “security mode”, and steps S33 to S39 are processing of the detection processing unit 240 related to the “security mode”.

  When the “crime prevention mode” is activated, the detection processing unit 240 of the child device 200 controls the wireless unit 260 after a predetermined time J (for example, 15 minutes) has elapsed, and only a certain time (for example, 5 minutes) from the antenna 201. A radio wave is transmitted (step S34).

  When the detection processing unit 140 of the parent device 100 detects the reception of the radio wave from the child device 200, the signal received at this time is sequentially sampled, and based on this, the eigenvector information output by the eigenvector computing unit 141 is expressed as “NoEvent. The data is stored as data (Vno) in the memory inside the event detector 143 (step S15). That is, eigenvector information (reference vector information) representing the radio wave propagation environment in the home space in the reference state (initial state) where no event has occurred is stored.

  Subsequently, the detection processing unit 140 of the parent device 100 detects the volume of the acoustic signal collected by the microphone 102 (step S16). Similarly, the detection processing unit 240 of the child device 200 detects the volume (signal level) of the acoustic signal collected by the microphone 202 (step S35). And the detection process part 240 of the subunit | mobile_unit 200 compares the detected sound volume with threshold value Pow1 (step S36).

  When the detection processing unit 240 of the child device 200 detects a sound having a volume equal to or higher than the threshold value Pow1, the volume data is transmitted to the parent device 100 (step S37). The detection processing unit 140 of the parent device 100 compares the volume detected by the microphone 102 on the parent device side or the volume indicated by the volume data detected by the microphone 202 on the child device 200 and transmitted from the child device 200 with the threshold value Pow1. (Step S17). Then, when it is recognized that the volume is equal to or higher than the threshold value Pow1, the process proceeds from step S17 to step S18.

  That is, if the volume of at least one of the acoustic signal collected by the microphone 102 of the parent device 100 and the acoustic signal collected by the microphone 202 of the child device 200 exceeds the threshold value Pow1, it is considered that the event is highly likely to occur. The detection processing unit 140 executes the processing after step S18.

  In the operation example shown in FIG. 8, only the sound volume collected by the microphones 102 and 202 is identified in step S17. However, other features may be identified. For example, whether the sound is an impact sound or the like may be identified from the frequency band of the acoustic waveform or the characteristics of the volume change pattern. Moreover, you may identify by comparing the waveform registered beforehand and the waveform of the detected acoustic signal.

  The detection processing unit 140 of the parent device 100 transmits a radio wave transmission instruction signal for instructing the child device 200 to transmit a radio wave (step S18). When slave unit 200 receives this radio wave transmission instruction signal, detection processing unit 240 controls radio unit 260 to transmit radio waves from antenna 201 for at least a predetermined time (step S38).

  When the detection processing unit 140 of the parent device 100 detects the reception of the radio wave from the child device 200, the signal received at this time is sequentially sampled, and the eigenvector information at the time t output by the eigenvector computing unit 141 based on this signal. (Vob (t)) (first eigenvector information) is acquired, and an evaluation value P (t) is calculated according to an evaluation function represented by the following equation (step S19).

Ｈ：共役（エルミート）転置
Ｖｎｏ：ステップＳ１５で保存した参照ベクトル
イベント発生がない状態で｜Ｖｎｏ｜＝｜Ｖｏｂ（ｔ）｜＝１とし、正規化した評価値Ｐ（ｔ）を算出する。

H: Conjugate (Hermitian) transposition Vno: Normalized evaluation value P (t) is calculated with | Vno | = | Vob (t) | = 1 in a state where the reference vector event stored in step S15 is not generated.

  Since the above evaluation function is normalized, the calculated evaluation value P (t) is 1 or smaller. That is, the evaluation value P (t) is close to 1 when no event has occurred, and the evaluation value P (t) is less than 1 when an event has occurred. In other words, the evaluation value P (t) in a state where an event has occurred is a value farther from 1 than the evaluation value P (t) in a state where no event has occurred. The evaluation value P (t) is for identifying whether or not an event has occurred.

  Specific examples relating to changes in the evaluation value P (t) are shown in FIGS. The example shown in FIG. 12 represents the change in the evaluation value P (t) measured in the office environment, and the example shown in FIG. 13 shows the change in the evaluation value P (t) measured in the single-family indoor environment. Represents. As shown in FIGS. 12 and 13, the evaluation value P (t) changes due to a change in the environment (a person, an object moves, etc.) within a predetermined area and is a value away from 1.

  Returning to FIG. 8, the detection processing unit 140 identifies whether or not an event has occurred based on the evaluation value P (t) calculated in step S19 (step S20). In this example, (1-P (t)) is compared with a predetermined threshold value Q1, and when the condition of ((1-P (t))> Q1) is satisfied, an event occurs, and the next step S23 Proceed to That is, since the current evaluation value P (t) is sufficiently small compared to the reference state (P (t) = 1) where no event has occurred, it is recognized that someone is moving in the detection target space. To do.

  When the condition ((1-P (t))> Q1) is not satisfied, the detection processing unit 140 starts from the time when the detection operation is started (t = 0, here, when the radio wave transmission instruction signal is transmitted in step S18). It is identified whether or not a predetermined time T1 (for example, 3 minutes) has elapsed (step S21). If the time T1 has not elapsed, the process proceeds to step S22, the counter at time t is incremented by one, the process returns to step S19, and if the time T1 has elapsed, the process proceeds to step S24.

  And the detection process part 140 of the main | base station 100 transmits a predetermined message (step S23). That is, the contents of the voice message registered in advance in the memory or the like are read, and a call is made to the destination registered in the memory or the like, for example, the telephone number of the mobile phone terminal 600 of the family 900 shown in FIG. Connect the line and send a voice message. For example, it is assumed that a voice message such as “there is a person who is absent” is transmitted.

  After the transmission of the voice message is completed, the detection processing unit 140 of the parent device 100 transmits a radio wave for instructing the child device 200 to stop the transmission of the radio wave in order to end the radio wave transmission from the child device 200. A stop instruction signal is transmitted (step S24). When receiving the radio wave transmission stop instruction signal from the parent device 100, the detection processing unit 240 of the child device 200 stops the radio wave transmission from the child device 200 (step S39).

  On the other hand, when “watch mode” is designated in step S13 of FIG. 8, the detection processing unit 140 of the parent device 100 causes the mode instruction including the watch mode instruction to switch the slave device 200 to the “watch mode”. A signal is transmitted to the subunit | mobile_unit 200 (step S41 of FIG. 9). When receiving the mode instruction signal for setting the watch mode from the master device 100, the detection processing unit 240 of the slave device 200 starts the watch mode operation (step S61 in FIG. 9), and performs the processing after step S62. move on.

  Steps S41 to S54 and Steps S71 to S72 shown in FIGS. 9 and 10 are processes of the detection processing unit 140 related to the “watching mode”, and steps S61 to S68 and Step S73 are processing of the detection processing unit 240 related to the “watching mode”. It is.

  The detection processing unit 140 of the parent device 100 detects the volume and sound quality of the acoustic signal collected by the microphone 102 (step S42).

  Similarly to the parent device 100, the detection processing unit 240 of the child device 200 detects the volume and sound quality of the acoustic signal collected by the microphone 202 (step S62), and compares the detected volume with the threshold value Pow2 (step S63). ). When the volume of the microphone 202 exceeds the threshold value Pow2, the detection processing unit 240 of the child device 200 transmits the collected sound signal volume and sound quality data to the parent device 100 (step S64).

  The detection processing unit 140 of the parent device 100 identifies whether the detected sound volume and sound quality are predetermined falling sounds (step S43). That is, when at least one of the volume of the sound signal detected by the microphone 102 of the parent device and the microphone 202 of the child device exceeds the threshold value Pow2 and the sound quality is similar to the characteristics of the falling sound, Accordingly, the process proceeds to step S44. If it is not a falling sound, the process returns to step S42 to continue detection of the acoustic signal.

  Note that whether or not it is similar to the characteristics of the falling sound may be identified from, for example, the frequency band of the acoustic waveform or the characteristics of the volume change pattern, and the waveform registered in advance and the waveform of the detected acoustic signal May be identified.

  The detection processing unit 140 of the parent device 100 refers to the state of the internal memory, and whether eigenvector information (Vno) representing the radio wave propagation environment in the home space in the reference state (initial state) where no event has occurred has already been stored Whether or not is identified (step S44).

  If it has not been saved yet, the process proceeds to step S46 after executing steps S71 to S73 of FIG. 10, and if it has been saved, the process proceeds from step S45 to S46.

  When the eigenvector information (Vno) is not stored in the internal memory, the detection processing unit 140 of the parent device 100 sends a radio wave transmission instruction signal to the child device 200 in order to detect eigenvector information representing the current radio wave propagation environment. Is transmitted (step S71 in FIG. 10). In this case, the detection processing unit 240 of the slave unit 200 performs radio wave transmission of the slave unit 200 for at least a predetermined time according to the radio wave transmission instruction signal received from the master unit 100 (step S73 in FIG. 10).

  When the detection processing unit 140 of the parent device 100 detects reception of radio waves from the child device 200, the signal received at this time is sequentially sampled, and based on this, the eigenvector information output by the eigenvector computing unit 141 is “NoEvent”. Data (Vno) is stored in the memory inside the event detection unit 143 (step S72 in FIG. 10). That is, the eigenvector information (reference vector information) representing the radio wave propagation environment in the home space in the reference state (initial state) where no event has occurred is stored.

  Returning to FIG. 9, the detection processing unit 140 of the parent device 100 transmits a radio wave transmission instruction signal to the child device 200 (step S45). In this case, the detection processing unit 240 of the slave unit 200 performs radio wave transmission of the slave unit 200 for at least a predetermined time according to the radio wave transmission instruction signal received from the master unit 100 (steps S65 and S66).

  The detection processing unit 140 of the parent device 100 sequentially samples the signal received from the child device 200, and based on this signal, the eigenvector information (Vob (t)) at time t output from the eigenvector operation unit 141 (first Eigenvector information). Then, using the eigenvector information (Vno) stored in the memory, the evaluation value P (t) (first evaluation value) at time t is calculated in accordance with the evaluation function expressed by the above-described equation (1). (Step S46).

  Subsequently, the detection processing unit 140 of the parent device 100 updates the value of the counter representing the time t (step S47).

  Subsequently, the detection processing unit 140 of the parent device 100 sequentially samples the signal received from the child device 200, and at a time (t + 1) after a predetermined time from the time t output by the eigenvector calculation unit 141 based on this signal. Eigenvector information (Vob (t + 1)) (second eigenvector information) is acquired. Then, using the eigenvector information (Vno) stored in the memory, the evaluation value P (t + 1) (second evaluation value) at time (t + 1) is obtained according to the evaluation function expressed by the above-described equation (1). Calculate (step S48).

  Subsequently, the detection processing unit 140 of the parent device 100 detects the first evaluation value P (t) detected at the previous time t and the second evaluation value P detected at the time (t + 1) after a predetermined time. A difference ΔP (t) from (t + 1) (a change between time t and t + 1) is obtained, and ΔP (t) is compared with a threshold value Q2 (step S49).

  If the condition of (ΔP (t) <Q2) is satisfied, the radio wave propagation environment has hardly changed over time, so that the person to be watched over, such as an elderly person, is recognized as being stationary and the process proceeds to step S50. . When the condition of (ΔP (t) <Q2) is not satisfied, it is recognized that the person to be watched is moving, and the process returns to step S42.

  Subsequently, the detection processing unit 140 of the parent device 100 compares the time t with the threshold value T2. That is, the length of time elapsed from the start of watching (when t = 0 in step S45) is compared with a predetermined threshold T2. The threshold value T2 may be set to 5 minutes as a representative example.

  When the condition of (t> T2) is satisfied, it is recognized that there is a possibility that an event has occurred, that is, a person has fallen and cannot move, and the process proceeds to the next step S51. When the condition of (t> T2) is not satisfied, the process returns to step S47 to continue watching.

  Subsequently, the detection processing unit 140 of the parent device 100 transmits a predetermined message (step S51). That is, the contents of the voice message registered in advance in the memory or the like are read, and a call is made to the destination registered in the memory or the like, for example, the telephone number of the mobile phone terminal 600 of the family 900 shown in FIG. Connect the line and send a voice message. For example, it is assumed that a voice message such as “Possibility that a person has fallen” is transmitted.

  After the transmission of this voice message is completed, the detection processing unit 140 of the parent device 100 transmits a radio wave transmission stop instruction signal to the child device 200 (step S52). When receiving the radio wave transmission stop instruction signal from the parent device, the detection processing unit 240 of the child device 200 stops the transmission of the radio wave from the child device 200 according to this instruction (step S67).

  Subsequently, the detection processing unit 140 of the parent device 100 ends the “watch mode” operation on the parent device 100 side (step S53), and instructs the child device 200 to end the “watch mode” operation. A signal is transmitted (step S54). When the detection processing unit 240 of the child device 200 receives the instruction signal for ending the watching mode from the parent device, the operation of the “watching mode” is ended (step S68).

  A supplementary explanation of the operation shown in FIGS.

  In the operation shown in FIG. 8, after detecting the absence of the absence button 104 and starting the “crime prevention mode”, eigenvector information (Vno) representing a reference state in which no event has occurred is acquired. In addition, the slave device 200 performs radio wave transmission after a predetermined time (J) has elapsed after the crime prevention mode is activated. Therefore, after the user presses the answering button 104 and actually goes out, radio wave transmission is started, and eigenvector information (Vno) is sampled. Thus, the eigenvector information (Vno) can be acquired in a state where there is no person in the house without requiring the user to bother sampling, and can be detected immediately when someone enters.

  Further, since eigenvector information (Vno) is newly acquired every time the mode is switched to the crime prevention mode, the latest eigenvector information (Vno) can be acquired even if there is a change in the layout of the house (such as movement of furniture). . Thereby, when the arrangement of the furniture is changed, the evaluation value P (t) becomes a value away from 1, and it is possible to suppress erroneous detection such as a message being transmitted although there is no intruder.

  Further, in the operation shown in FIG. 8, only when a loud sound is detected after the “crime prevention mode” is activated, the radio wave is transmitted from the child device 200, and the detection operation regarding the eigenvector information (Vob (t)) is completed. Then, the radio wave transmission from the child device 200 is stopped. Accordingly, the transmission of radio waves can be stopped except when necessary, and wasteful power consumption can be suppressed. However, the slave unit 200 (or the slave unit 300) may perform radio wave transmission to the master unit 100 regardless of the acoustic signal.

  Further, in the operation shown in FIG. 8, the evaluation value P (t) based on the eigenvector information is compared in the “crime prevention mode” to identify whether or not an event has occurred, but as in the “watch mode”, Identification may be performed by comparing the change (ΔP (t)) of the evaluation value P (t).

  In the operation shown in FIG. 9, in the “watching mode”, the person uses the change ΔP (t) (= P (t + 1) −P (t)) of the evaluation value of the eigenvector information per unit time. Judging whether or not. Note that the time interval (difference between time t and time t + 1) for calculating the evaluation value change ΔP (t) is not particularly limited.

  For example, in the graph shown in FIG. 12, the evaluation value P (t) at 45 to 55 on the horizontal axis (time (sec)) is in a still state but is in a still state. Compared to the evaluation value P (t) at this time, the value is far from 1. For example, when the threshold value is set so as to determine that “P (t) is greater than 0.95” as “stationary state” and when P (t) is less than 0.95 as “state where a person is moving”, the horizontal axis The evaluation value P (t) at 45 to 55 of (time (sec)) is determined as a state where a person is moving. Therefore, simply identifying whether P (t) is close to 1 has a high possibility of erroneous detection when a person is stationary for a long time. Therefore, in the operation of FIG. 9, the evaluation value change ΔP (t) is identified in the “watching mode”.

  In the operation shown in FIG. 9, whether or not the sound quality of the detected sound is a falling sound is identified on the parent device 100 side, but the sound quality may be identified on the child device 200 side. Also, the sound quality may be identified by both.

  In the operation illustrated in FIG. 10, when acquiring eigenvector information (Vno) in the reference state, this may be executed in a state where there is a person in the house. However, in the “watch mode”, the presence / absence of an event is identified based on the change ΔP (t) in the evaluation value. Therefore, even if the eigenvector information (Vno) acquired in the presence of a person is used, There is no malfunction in operation. Therefore, even if the eigenvector information (Vno) has not yet been sampled, the “watch mode” can be performed without requiring the user to bother to sample.

  Also, the sound volume thresholds Pow1 and Pow2 in the operations of FIGS. 8 and 9 are determined in advance so as to satisfy the relationship (Pow1 <Pow2). That is, in the “crime prevention mode”, it is usually assumed that there are no people indoors and there is no sound. For this reason, the accuracy of intruder detection can be increased by setting the threshold value Pow1 for detecting sound low.

  Further, the threshold values Q1 and Q2 of the evaluation values in the operations of FIGS. 8 and 9 are determined so as to satisfy the relationship (Q1 <Q2). That is, in the “crime prevention mode”, there is usually no person indoors, and basically the evaluation value P (t) should always be close to 1. For this reason, the accuracy of intruder detection can be increased by setting a lower threshold value Q1 for detecting the presence of a person. On the other hand, even in the “watch mode”, even if an elderly person falls, it is unlikely that he / she will stop moving immediately after the fall. For example, by moving only the limbs, the evaluation value P (t) slightly changes, which may cause a state where the “still state” cannot be detected. In order to suppress this, it is preferable that the threshold value Q2 is larger than the threshold value Q1 used when it is desired to detect a slight change.

  Next, a description will be supplemented regarding the difference between the above-described “crime prevention mode” and “watch mode”.

  The “crime prevention mode” is intended to detect “a state where a person is present” rather than “a state where a person is moving”. That is, the purpose is to detect a change in the environment in the home (in the area) due to a person entering the home (in the area) that is away. This is because there should be no people in the house during absence and the environment in the house should not change. From this, if sampling is performed in a state where no person is in the house (eigenvector information (Vno) is acquired), and then P (t) is calculated in the state where there is a person, at least P (t) is a value separated from 1. become. Thereby, an intruder can be detected with high accuracy. Conversely, if ΔP (t) is used to determine the presence or absence of an intruder, it may not be possible to detect when there is little intruder movement.

  The “watch mode” is intended to detect “a state in which a person is stationary”. That is, the object is to detect a state where there is no change in the environment in the home (in the area) for a predetermined time or more in the home (in the area) where the person should be active. Therefore, the determination is made using ΔP (t) as described above. In the watching mode, since a person lives in the house, there is a possibility that an object in the house moves. When the object moves, the state in the house is always different from the sampled (acquired eigenvector information (Vno)) (reference state), and P (t) always starts from 1 regardless of human movement. It becomes a distant value. For this reason, it is difficult to distinguish whether the reason why P (t) is away from 1 is due to the movement of a person or the movement of an object. Therefore, in order to detect a state where a person is stationary for a certain time, a better result can be obtained by using the change ΔP (t) of the evaluation value.

  In this embodiment, when it is determined that there is no change in the environment in the area, the evaluation value P (t) is always the same value (that is, the change ΔP (t) in the evaluation value is 0). It is not when the evaluation value change ΔP (t) is within a predetermined range (below a predetermined threshold).

Next, a modified example of the watching mode will be described.
The operations of the parent device 100 and the child device 200 relating to the modified example of the watching mode are shown in FIG. That is, the process of the detection processing unit 140 of the parent device 100 proceeds to step S81 in FIG. 11 instead of step S41 in FIG. 9 when the process is in step S13 shown in FIG. 8 (NO: watching mode).

  The detection processing unit 140 of the parent device 100 refers to the state of the internal memory, and whether eigenvector information (Vno) representing the radio wave propagation environment in the home space in the reference state (initial state) where no event has occurred has already been stored Whether or not is identified (step S81).

  If it has not been saved yet, the process proceeds to step S82 after executing steps S71 to S73 of FIG. 10, and if it has been saved, the process proceeds from step S81 to S82.

  The subsequent steps S82 to S86 in FIG. 11 are substantially the same as steps S45 to S49 in FIG.

  That is, in order to detect eigenvector information representing the current radio wave propagation environment, the detection processing unit 140 of the parent device 100 transmits a radio wave transmission instruction signal to the child device 200 (step S82). In this case, the detection processing unit 240 of the child device 200 performs radio wave transmission of the child device 200 for at least a predetermined time according to the radio wave transmission instruction signal received from the parent device 100 (steps S101 and S102).

  Further, the detection processing unit 140 of the parent device 100 sequentially samples the signal received from the child device 200, and based on this signal, the eigenvector information (Vob (t)) (first) output by the eigenvector computing unit 141 is output. 1 eigenvector information) is acquired (step S83). Then, using the eigenvector information (Vno) stored in the memory, the evaluation value P (t) (first evaluation value) at time t is calculated according to the evaluation function expressed by the above-described equation (1). To do.

  Subsequently, the detection processing unit 140 of the parent device 100 updates the value of the counter representing the time t (step S84).

  Subsequently, the detection processing unit 140 of the parent device 100 sequentially samples the radio wave signal received from the child device 200, and based on this signal, the eigenvector information (Vob ()) at the time (t + 1) output by the eigenvector calculation unit 141 is obtained. t + 1)) (second eigenvector information) is acquired (step S85). Then, using the eigenvector information (Vno) stored in the memory, the evaluation value P (t + 1) (second evaluation value) at time (t + 1) according to the evaluation function expressed by the above-described equation (1). Is calculated.

  Subsequently, the detection processing unit 140 of the parent device 100 detects the first evaluation value P (t) detected at the previous time t and the second evaluation value P detected at the time (t + 1) after a predetermined time. A difference ΔP (t) (change between time t and t + 1) from (t + 1) is obtained, and ΔP (t) is compared with the threshold value Q2 (step S86).

  If the condition of (ΔP (t) <Q2) is satisfied, the radio wave propagation environment has hardly changed over time, so that the person to be watched over, such as an elderly person, is recognized as being stationary and the process proceeds to step S87. . When the condition of (ΔP (t) <Q2) is not satisfied, it is recognized that the person to be watched is moving, and the process returns to step S84.

  Subsequently, the detection processing unit 140 of the parent device 100 performs a comparison between the time t and the threshold T3 (step S87). That is, the length of time elapsed from the start of watching (when t = 0 in step S45) is compared with a predetermined threshold T3. The threshold value T3 may be set to 20 minutes as a representative example.

  When the condition of (t> T3) is satisfied, it is recognized that there is a possibility that the person has hardly moved for a certain period of time (T3), and the processing after the next step S88 is executed. If the condition of (t> T3) is not satisfied, the process returns to step S84 to continue watching.

  That is, acquisition of eigenvector information (first eigenvector information) is started regardless of whether or not an acoustic signal is detected, and the change ΔP (t) in the evaluation value of the eigenvector information is monitored for a certain time (T3). The point is greatly different from the operation of FIG. Further, the processing after step S88 is also different from the operation of FIG.

  Subsequently, the detection processing unit 140 of the parent device 100 transmits a predetermined message (step S88). That is, the contents of the voice message registered in advance in the memory or the like are read, and a call is made to the destination registered in the memory or the like, for example, the telephone number of the mobile phone terminal 600 of the family 900 shown in FIG. Connect the line and send a voice message. For example, it is assumed that a voice message such as “Possibility that a person is not moving” is transmitted.

  Subsequently, after completing the transmission of the voice message, the detection processing unit 140 of the parent device 100 performs control so that a call can be made between the person who is the destination of the voice message and the monitoring target person. That is, the detection processing unit 140 of the parent device 100 shifts to a state in which the parent device 100 can automatically receive a call from the destination (automatic incoming call on state (automatic incoming call ON)) (step S89).

  In this case, the family 900 that has received the transmitted voice message makes a call to the telephone number of the parent device 100 by, for example, the mobile phone terminal 600 in order to confirm the actual situation.

  When the base unit 100 is called by calling from the mobile phone terminal 600 or the like, since the base unit 100 is in an automatic incoming call on state, the detection processing unit 140 of the base unit 100 does not particularly operate the base unit 100 or the slave unit 200 An incoming call (automatic incoming call) is automatically made (step S90).

  Subsequently, the detection processing unit 140 of the parent device 100 switches the parent device 100 itself to a hands-free state (hands-free ON) for performing a hands-free call (step S91), and starts a call (step S93). Further, the detection processing unit 140 of the parent device 100 transmits a hands-free instruction signal for instructing to shift to the hands-free state to the child device 200 so that the child device 200 also performs hands-free calling (step S92). . The detection processing unit 140 of the child device 200 receives the hands-free instruction signal from the parent device, switches the child device 200 side to the hands-free state (step S103), and starts a call (step S104).

  Therefore, even if the person to be monitored such as the elderly is in a state where it cannot move at all, if it is in a state where it is conscious and can speak, the hands-free call function of the parent device 100 or the child device 200 is used. Thus, a call can be made with the mobile phone terminal 600 or the like as the caller. Here, a multi-party call state including the mobile phone terminal 600, the parent device 100, and the child device 200 is entered.

  When the telephone call (step S93 or step S104) ends and the mobile phone terminal 600 or the like as the caller disconnects the telephone line, the detection processing unit 140 of the base unit 100 detects the disconnection of the telephone line, and the automatic incoming call is on. Is released. That is, the state is switched to a state where automatic incoming is impossible (automatic incoming off state (automatic incoming OFF)) (step S94). Furthermore, the detection processing unit 140 of the parent device 100 cancels the hands-free state of the parent device 100 and switches to the hands-free off state (step S95). And the detection process part 140 of the main | base station 100 transmits the hands-free cancellation | release signal for canceling | releases a hands-free state to the subunit | mobile_unit 200. FIG. The detection processing unit 240 of the child device 200 cancels the hands-free state of the child device 200 and switches to the hands-free off state (step S105).

  In this way, by automatically setting an incoming call ON state in which incoming call processing is automatically performed for an incoming call from the mobile phone terminal 600 or the like, a call is automatically made along with the incoming call from the mobile phone terminal 600 or the like. Ready to ask for help from the other party.

  In “watch mode” shown in FIG. 11, when mobile phone terminal 600 or the like as the caller disconnects the telephone line, detection processing unit 140 of base unit 100 cancels the automatic incoming call on state (step S94), and hands Although the free state is released (step S95), the automatic incoming call on state and the hands-free state do not have to be released for a certain period of time, and this state may be maintained until the user releases it himself. Thereby, even when there is an incoming call from the source mobile phone terminal 600 or the like, the user can make a call and can notify his / her state.

  Note that the time thresholds T2 and T3 in the operations of FIGS. 9 and 11 are desirably determined so as to satisfy the relationship (T2 <T3). That is, in the “watch mode” of the operation shown in FIGS. 8 to 10, “whether or not a person is stationary” is detected using radio waves triggered by the generation of sound. That is, since detection using radio waves is started under the condition that there is a high possibility that an elderly person has fallen, erroneous detection of an event is unlikely to occur even when monitoring for a relatively short time (T2).

  On the other hand, in the modified example of the “watching mode” shown in FIG. 11, “whether or not a person is stationary” is always detected using radio waves regardless of whether or not sound is generated. Therefore, even when a person is still but there is no problem with his / her health condition, such as a nap of an elderly person, it may be detected as an event and an unnecessary message may be transmitted. Therefore, in order to suppress erroneous detection, in the modification of FIG. 11, when the monitoring time is made longer than the operation of FIG. 9 and the value of ΔP (t) is less than or equal to the threshold value Q2 over time T3. Send a message.

  The “watch mode” shown in FIG. 9 and the “watch mode” shown in FIG. 11 may be changed. In this case, the detection processing unit 140 of the parent device 100 can cope with “watching modes” having different event detection conditions. For example, the configuration may be such that the user can appropriately change to a different “watch mode” with a button, a remote control, or the like. Thereby, the user can select the “watch mode” suitable for the user's environment.

  Further, when the sound signal is not used as in the “watch mode” shown in FIG. 11, the time threshold T3 may be automatically changed using the time based on the user's lifestyle set in advance. Good. That is, the event detection condition may be changeable based on the user's lifestyle. For example, the threshold T3 for the user's bedtime is 8 hours, and the threshold T3 for the user's activity time is 20 minutes. Thereby, it is possible to suppress erroneous detection such as detecting that the user is sleeping as “still state”.

  Furthermore, the “watch mode” may be switched after detecting that ΔP (t) has become larger than the threshold value when the user gets up and starts the activity. Thus, regardless of the user's preset lifestyle, the “watch mode” at the time of user sleep and the “watch mode” at the time of user activity can be automatically changed according to the user's wake-up time of the day. it can. That is, the time threshold T2 or T3 can be automatically changed. It is also possible to make changes such as using acoustic signals for event detection.

  In the present embodiment, different “watch modes” have been described, but these different “watch modes” can be combined as appropriate.

  In this embodiment, an abnormality of the elderly is notified to the family using a telephone line, but the present invention is not particularly limited to this, and a wired or wireless Internet line may be used, and the notification destination is a hospital or The police may be.

  In this embodiment, the event detection device (master device 100) itself detects an event and transmits a message. However, the event detection device alone does not have to perform all these processes. That is, event detection conditions and event detection performed based on the detection conditions may be performed by a device external to the event detection apparatus. For example, master device 100 may receive radio waves from slave devices 200 and 300, transmit information based on the radio waves to an external device, and the external device may determine event detection. At this time, an external device may send a message, or a communication device such as the parent device 100 may send a message according to an instruction from the external device.

  It should be noted that the programs necessary for executing the operations shown in FIGS. 8 to 11 can be stored in advance in a memory (ROM or the like) built in the parent device 100 or the child device 200, or can be stored in a predetermined manner. The program can be read from the recording medium and executed, or downloaded from a server on a predetermined network and executed.

  The present invention is useful for an event detection device, an event detection system, an event detection method, and an event detection program that can reliably detect an event. For example, it is assumed to be used by being incorporated in a device such as a cordless telephone system used in the home. Of course, it can be considered to be incorporated in equipment other than cordless telephones. As for the use of the present invention, for example, it is assumed to be used for watching an elderly person in the home or for crime prevention in an answering house.

100 Base unit 101 Array antenna 102, 202 Microphone 103, 203 Speaker 104 Answering button (an example of a mode designation unit and a mode input unit)
110, 210 Operation unit 120, 220 Display unit 130, 230 Control unit 140, 240 Detection processing unit 141 Eigenvector calculation unit 142 Volume detection unit 143 Event detection unit 144 Slave unit communication unit (an example of transmission unit)
145 Mode setting unit (an example of a mode specifying unit and a detection condition determining unit)
146 Message transmission instruction part (an example of a transmission part)
150, 250 Audio unit 160, 260 Radio unit 170, 270 Power supply unit 180 Interface unit 200, 300 Slave unit 241 Radio wave transmission instruction unit 242 Volume detection unit 243 Base unit communication unit 400 Telephone line 500 Base station 600 Mobile phone terminal 700 Aged alone Resident's house 800 Target person 900 Family

Claims (28)

An event detection device for detecting an event in a predetermined area,
A mode designating unit for designating one of a plurality of event detection modes corresponding to the type of event;
In accordance with the event detection mode specified by the mode specifying unit, a detection condition determining unit that determines a detection condition for an event,
An event detector that detects the occurrence of an event based on the detection condition determined by the detection condition determiner;
An event detection device comprising: The event detection device according to claim 1,
When the mode designating unit designates the first event detection mode,
The event detection unit detects that an event has occurred when there is an environmental change in the area,
When the mode designating unit designates the second event detection mode,
The event detection unit is an event detection device that detects that an event has occurred when there is no environmental change in the area for a predetermined time. The event detection device according to claim 2,
An event detection apparatus comprising: a transmission unit configured to transmit a predetermined message to a predetermined contact via a communication line when an event has been detected by the event detection unit. The event detection device according to claim 3, further comprising:
It has a receiver that receives radio waves from other communication devices,
The event detection unit is an event detection device that detects the occurrence of an event based on the radio wave received by the reception unit. The event detection device according to claim 4,
The event detection unit detects an occurrence of an event based on the radio wave propagation environment by detecting a radio wave propagation environment in the area from a signal included in the radio wave received by the reception unit. The event detection device according to claim 5,
The event detection unit obtains eigenvector information including information on the direction of arrival of radio waves in the area from the signal included in the radio wave received by the reception unit as the radio wave propagation environment, and based on the eigenvector information, An event detection device that detects occurrence. The event detection device according to claim 6,
The event detection unit is an event detection device that detects an acoustic signal generated in the area and detects occurrence of an event based on the eigenvector information and the acoustic signal. The event detection device according to claim 6 or 7,
When the mode designating unit designates the first event detection mode,
The event detection unit acquires the eigenvector information as reference vector information, acquires first eigenvector information after acquiring the reference vector information, and generates an event based on the reference vector information and the first eigenvector information An event detection device that calculates an evaluation value for detecting an event and detects that an event has occurred when the evaluation value is equal to or less than a predetermined threshold. The event detection device according to claim 8,
The event detection unit is an event detection device that starts acquiring the first eigenvector information when a signal level of the acoustic signal is equal to or higher than a predetermined level. The event detection device according to claim 6 or 7,
When the mode designating unit designates the second event detection mode,
The event detection unit
The eigenvector information is acquired as reference vector information, first eigenvector information is acquired after acquiring the reference vector information, and an event occurrence is detected based on the reference vector information and the first eigenvector information. Calculate the evaluation value of 1,
Obtaining second eigenvector information after obtaining the first eigenvector information, calculating a second evaluation value based on the reference vector information and the second eigenvector information;
An event detection device that detects that an event has occurred when a state in which a difference between the second evaluation value and the first evaluation value is equal to or less than a predetermined threshold continues for a predetermined time. The event detection device according to claim 10,
The event detection unit starts acquisition of the first eigenvector information when the signal level of the acoustic signal is equal to or higher than a predetermined level and the acoustic signal indicates a falling sound. The event detection device according to claim 6, further comprising:
An event detection apparatus comprising: a transmission unit that transmits a radio wave transmission instruction signal for instructing the other communication apparatus to transmit radio waves. The event detection device according to claim 3,
The event detection unit is set to an automatic incoming call ON state in which an incoming call process is performed for an incoming call from another communication device after a message is transmitted by the transmission unit. An event detection device for detecting an event in a predetermined area,
A receiver that receives radio waves from other communication devices;
A mode designating unit for designating one of a plurality of event detection modes corresponding to the type of event;
In accordance with the event detection mode specified by the mode specifying unit, a detection condition determining unit that determines a detection condition for an event,
An event detection unit that detects the occurrence of an event based on the detection condition determined by the detection condition determination unit, and detects the occurrence of an event based on the radio wave received by the reception unit;
An event detection device comprising: The event detection device according to claim 14,
The event detection unit detects an occurrence of an event based on the radio wave propagation environment by detecting a radio wave propagation environment in the area from a signal included in the radio wave received by the reception unit. The event detection device according to claim 15,
The event detection unit obtains eigenvector information including information on the direction of arrival of radio waves in the area from the signal included in the radio wave received by the reception unit as the radio wave propagation environment, and based on the eigenvector information, An event detection device that detects occurrence. The event detection device according to claim 16, wherein
The event detection unit is an event detection device that detects an acoustic signal generated in the area and detects occurrence of an event based on the eigenvector information and the acoustic signal. The event detection device according to claim 16 or 17,
When the mode designating unit designates the first event detection mode,
The event detection unit acquires the eigenvector information as reference vector information, acquires first eigenvector information after acquiring the reference vector information, and generates an event based on the reference vector information and the first eigenvector information An event detection device that calculates an evaluation value for detecting an event and detects that an event has occurred when the evaluation value is equal to or less than a predetermined threshold. The event detection device according to claim 18, wherein
The event detection unit is an event detection device that starts acquiring the first eigenvector information when a signal level of the acoustic signal is equal to or higher than a predetermined level. The event detection device according to claim 16 or 17,
When the mode designating unit designates the second event detection mode,
The event detection unit
The eigenvector information is acquired as reference vector information, first eigenvector information is acquired after acquiring the reference vector information, and an event occurrence is detected based on the reference vector information and the first eigenvector information. Calculate the evaluation value of 1,
Obtaining second eigenvector information after obtaining the first eigenvector information, calculating a second evaluation value based on the reference vector information and the second eigenvector information;
An event detection device that detects that an event has occurred when a state in which a difference between the second evaluation value and the first evaluation value is equal to or less than a predetermined threshold continues for a predetermined time. The event detection device according to claim 20, wherein
The event detection unit starts acquisition of the first eigenvector information when the signal level of the acoustic signal is equal to or higher than a predetermined level and the acoustic signal indicates a falling sound. The event detection device according to any one of claims 14 to 21, further comprising:
An event detection apparatus comprising: a transmission unit that transmits a radio wave transmission instruction signal for instructing the other communication apparatus to transmit radio waves. The event detection device according to any one of claims 14 to 22, further comprising:
An event detection apparatus comprising: a transmission unit configured to transmit a predetermined message to a predetermined contact via a communication line when an event has been detected by the event detection unit. The event detection apparatus according to claim 23, wherein
The event detection unit is set to an automatic incoming call ON state in which an incoming call process is performed for an incoming call from another communication device after a message is transmitted by the transmission unit. The event detection device according to any one of claims 14 to 23, wherein:
The mode specifying unit is an event detection device that is a mode input unit that can be input by a user. An event detection system that performs communication between a first communication device and a second communication device and detects an event in a predetermined area,
The first communication device determines an event detection condition according to a mode designating unit that designates one of a plurality of event detection modes corresponding to the type of event, and the event detection mode designated by the mode designating unit. A detection condition determination unit, and an event detection unit that detects the occurrence of an event based on the detection condition determined by the detection condition determination unit,
The second communication apparatus is an event detection system that operates according to an event detection mode specified by the mode specifying unit. An event detection method for detecting an event in a predetermined area,
Specifying one of multiple event detection modes corresponding to the event type;
Determining an event detection condition according to the specified event detection mode;
Detecting the occurrence of an event based on the determined detection condition;
An event detection method comprising:   The event detection program for making a computer perform each step of the event detection method of Claim 27.

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