Receiving apparatus and control method thereof

Abstract

Provide a receiving device that can expand the range for detecting the presence of a person with a single sensor. 【Solution means】The receiving device of the embodiment includes a sensor, an accumulation determination unit, an accumulation unit, a calculation unit, and a presence determination unit. The sensor acquires a plurality of distance-angle information. The accumulation determination unit determines whether to accumulate the number of the plurality of distance-angle information. The accumulation unit accumulates the number of the plurality of distance-angle information determined to be accumulated by the determination unit. The calculation unit calculates a threshold for absence determination using the number of the plurality of distance-angle information accumulated in the accumulation unit. The presence determination unit compares the number of the plurality of distance-angle information with the threshold for absence determination, and determines that a person is present when it is determined that the number of the plurality of distance-angle information is equal to or greater than the threshold.

Description

Technical Field

[0001] Embodiments of the present invention relate to a receiving device and a method for controlling the receiving device.

Background Art

[0002] Conventionally, techniques for detecting people, objects, etc. using various sensors and notifying the user of the detection results or controlling various systems according to the detection results are known. Generally, a sensor has an area where accurate position information can be detected and an area where accurate position information cannot be detected.

[0003] Therefore, when a person is present in an area where the sensor cannot detect accurate position information, the position of the person cannot be correctly determined. For example, by providing a plurality of sensors, it is conceivable to detect the position of a person or the like present in an area where accurate position information cannot be detected by a single sensor. However, when a plurality of sensors are provided, there is a problem that the cost increases.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the embodiment is to provide a receiving device and a method for controlling the receiving device that enable a single sensor to expand the range for detecting the presence of a person.

Means for Solving the Problems

[0006] The receiving device according to the embodiment includes a sensor, an accumulation determination unit, an accumulation unit, a calculation unit, and a presence determination unit. The sensor acquires a plurality of distance-angle information. The accumulation determination unit determines whether to accumulate the number of the plurality of distance-angle information. The accumulation unit accumulates the number of the plurality of distance-angle information determined to be accumulated by the determination unit. The calculation unit calculates a threshold value for absence determination using the number of the plurality of distance-angle information accumulated in the accumulation unit. The presence determination unit compares the number of the plurality of distance-angle information with the threshold value for absence determination, and determines that a person is present when it is determined that the number of the plurality of distance-angle information is equal to or greater than the threshold value.

Brief Description of the Drawings

[0007]

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Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing the configuration of a television receiver including a receiving device according to an embodiment. As shown in FIG. 1, the television receiving apparatus 100 includes a receiving device 1, a monitor 2, a speaker 3, a receiving unit 4, a connection unit 5, and a communication unit 6. The receiving device 1 includes a control unit 10, a tuner 11, a memory 12, a device state detection unit 13, a remote control event acquisition unit 14, a behavior history accumulation unit 15, a brightness detection unit 16, a detection unit 17, and a sensor 18.

[0009] The control unit 10 includes a position information acquisition unit 21, a DoA acquisition unit 22, a DoA accumulation determination unit 23, a DoA accumulation unit 24, an absence determination DoA number calculation unit 25, and a presence determination unit 26.

[0010] The control unit 10 controls each part of the receiving device 1. The control unit 10 is constituted by a processor using, for example, a CPU or the like, and controls each part of the receiving device 1 by reading and executing a program stored in the memory 12.

[0011] The monitor 2 is a liquid crystal, an organic EL (electroluminescence), a plasma display, an SED (surface field display), a video projector, a rear projection (rear projection type), or a cathode ray tube (including a flat type), etc.

[0012] The remote controller (hereinafter referred to as the remote control) 34 is a terminal for a user to operate the receiving device 1. A signal transmitted when the user operates the remote control 34 is received by the receiving unit 4 and input to the receiving device 1. Note that the remote control 34 may be a smartphone, a tablet terminal, an AI speaker, or the like.

[0013] The tuner 11 receives by selecting one channel from among a plurality of channels of terrestrial digital television broadcasts and satellite digital television broadcasts received by the antenna 31.

[0014] A recorder 35 is connected to the connection part 5. The video content recorded in the recorder 35 is input to the receiving device 1 via the connection part 5. The communication part 6 communicates with the server 37 via the network line 36. The video content recorded in the server 37 is input to the receiving device 1 via the communication part 6.

[0015] The receiving device 1 processes the input video and outputs an image signal and an audio signal. The user can view the program by outputting the image signal to the monitor 2 and the audio signal to the speaker 3.

[0016] The device state detection part 13 detects the state of the device such as ON / OFF of the power supply of the monitor 2, for example, and outputs the detection result to the control part 10.

[0017] The remote control event acquisition part 14 acquires a remote control event indicating that the remote control 34 has been operated by the user and outputs it to the control part 10.

[0018] The behavior history accumulation part 15 accumulates information such as the day of the week and time zone when the monitor 2 is turned on and the user views the program as a behavior history, for example. The behavior history accumulation part 15 outputs the accumulated behavior history information to the control part 10.

[0019] The brightness detection part 16 is, for example, an illuminance sensor, detects the brightness of the room where the receiving device 1 is installed, and outputs the detection result to the control part 10.

[0020] The detection part 17 detects whether the video content recorded in the recorder 35 or the server 37 is being input, and outputs the detection result to the control part 10.

[0021] Sensor 18 is, for example, a radio wave sensor using a frequency continuous modulation (FMCW) method. Sensor 18 transmits a transmission wave whose frequency changes over time, and receives a received wave reflected by an object. Sensor 18 performs distance estimation and angle estimation based on the information of the transmission wave and the received wave, detects distance-angle information (DoA), which is information on distance and angle, as points, extracts a plurality of distance-angle information as a point cloud by detecting a plurality of distance-angle information, and outputs it to the control unit 10. The detailed configuration of sensor 18 will be described with reference to FIG. 2.

[0022] The position information acquisition unit 21 acquires the position information of a person existing in the detection area 51 (see FIG. 3A) of sensor 18 by using the detection result of sensor 18, that is, a plurality of distance-angle information (DoA). As shown in FIG. 3A, when the front of the television receiver 1 is set to 0 degrees, the detection area 51 is a range surrounded by +θ degrees to the right, -θ degrees to the left, and a distance D toward the front. And the area other than this detection area 51 becomes the non-detection area 52 (see FIG. 3A) of sensor 18.

[0023] The DoA acquisition unit 22 acquires the number (DoA number) of a plurality of distance-angle information (DoA) by using the detection result of sensor 18.

[0024] The DoA accumulation determination unit 23 determines whether to accumulate the information on the DoA number acquired by the DoA acquisition unit 22.

[0025] The DoA accumulation unit 24 accumulates the DoA number determined to be accumulated by the DoA accumulation determination unit 23.

[0026] The absent determination DoA number calculation unit 25 calculates the DoA number (threshold value) for absent determination from the DoA number accumulated in the DoA accumulation unit 24. For example, the absent determination DoA number calculation unit 25 calculates the average value of the DoA numbers accumulated every time, and uses it as the DoA number (threshold value) for absent determination.

[0027] The presence determination unit 26 that constitutes the in-room determination unit determines whether a person is present in the detection area 51 and the non-detection area 52 of the sensor 18 based on the threshold value calculated by the absence determination DoA number calculation unit 25. Specifically, the presence determination unit 26 compares the currently acquired DoA number with the DoA number for absence determination, and if the currently acquired DoA number is greater than or equal to the DoA number for absence determination, it determines that a person is present in the detection area 51 and the non-detection area 52 of the sensor 18.

[0028] Next, the configuration of the sensor 18 will be described with reference to FIG. 2. FIG. 2 is a configuration diagram showing an example of the configuration of the sensor.

[0029] As shown in FIG. 2, the sensor 18 includes a modulation signal generator 41, a transmission antenna 42, a plurality of reception antennas 43a to 43c, a plurality of mixers 44a to 44c, a plurality of analog-to-digital converters (hereinafter referred to as ADCs) 45a to 45c, and a digital signal processor (hereinafter referred to as DSP) 46. In the example of FIG. 2, the sensor 18 includes one transmission antenna 42, but it may include a plurality of transmission antennas.

[0030] The modulation signal generator 41 generates a modulation wave (transmission wave) whose frequency linearly changes in accordance with time change, and outputs it to the transmission antenna 42 and the plurality of mixers 44a to 44c. The transmission wave generated by the modulation signal generator 41 is transmitted from the transmission antenna 42 and then reflected by an object.

[0031] The plurality of reception antennas 43a to 43c receive the reflected wave (received wave) reflected by the object and output it to the plurality of mixers 44a to 44c respectively.

[0032] The plurality of mixers 44a to 44c mix the transmission wave input from the modulation signal generator 41 and the received wave received by the plurality of reception antennas 43a to 43c respectively, generate an IF (intermediate frequency) signal, and output it to the plurality of ADCs 45a to 45c.

[0033] The plurality of ADCs 45a to 45c each convert the input IF signal from an analog signal to a digital signal, and output the converted digital signal to the DSP 46.

[0034] The DSP 46 performs various signal processes on the digital signals input from the plurality of ADCs, and acquires the position information (distance information, angle information) and speed information of the object. Specifically, the DSP executes a Fourier transform (distance FFT) on the input data in units of chirps to acquire distance information. Next, the DSP 46 executes a Fourier transform (speed FFT) on the results of the distance FFT in units of frames to acquire speed information. Finally, the DSP 46 executes a Fourier transform (angle FFT) across all of the plurality of receiving antennas 43a to 43c based on the results of the speed FFT to acquire angle information.

[0035] The sensor 18 extracts a plurality of distance-angle information (DoA) as a point cloud by performing distance estimation and angle estimation by the distance FFT and the angle FFT. The control unit 10 determines the presence of a person from the plurality of distance-angle information (DoA) extracted by the sensor 18.

[0036] FIG. 3A is a diagram showing an example of DoA detected in a state where there is no person in the room. Further, FIG. 3B is a diagram showing an example of DoA detected in a state where a person exists in a non-detection area of the sensor. Further, FIG. 3C is a diagram showing an example of DoA detected in a state where a person exists in a detection area of the sensor.

[0037] As shown in FIGS. 3A to 3C, the sensor 18 has a detection area 51 capable of detecting an accurate position of a person or the like, and a non-detection area 52 incapable of detecting an accurate position of a person or the like.

[0038] As shown in FIG. 3A, even when there is no person, the DoA is detected by the sensor 18 due to a slight shake of an object or the like. However, the number of detected DoAs is small, and the position information of the person cannot be specified.

[0039] As shown in FIG. 3B, when a person is present in the non-detection area 52 (outside the detection area 51) of the sensor 18, the sensor 18 detects a certain degree of DoA dispersion. However, the number of detected DoAs is not large and they are dispersed, so the position information of the person cannot be specified.

[0040] As shown in FIG. 3C, when a person is present within the detection area 51 of the sensor 18, the sensor detects a large number of DoAs. Furthermore, many of the detected DoAs are concentrated at a single point, and since the distance angle can be specified, the position information of the person can be specified.

[0041] As shown in FIGS. 3A to 3C, there is a correlation between the number of detected DoAs and whether a person is present in the room. In the present embodiment, the number of detected DoAs is used to determine whether a person is present in the space.

[0042] More specifically, multiple DoAs obtained by distance estimation and angle estimation are detected when a moving object is present in the space (room). That is, a large number of DoAs means that there is some moving object in the space. Therefore, by monitoring the number of acquired DoAs, if the number of DoAs is equal to or greater than a certain threshold, it can be considered that a moving object or a person is present in the space.

[0043] Next, the in-room determination process of the person by the receiving device 1 configured as described above will be described. FIG. 4 is a flowchart showing an example of the flow of the in-room determination process of the person by the receiving device.

[0044] First, the control unit 10 acquires a plurality of distance angle information (DoAs) from the sensor 18 (S1). The position information acquisition unit 21 acquires the position information of a person (moving object) from the plurality of acquired DoAs. Also, the DoA number acquisition unit 22 acquires the number of the plurality of acquired DoAs (DoA number). Here, all the distance angle information (DoAs) located within the detection area 51 or within the non-detection area 52 is acquired without distinguishing.

[0045] The control unit 10 determines whether the position information of a person can be acquired within the detection area 51 by the position information acquisition unit 21 (S2). When the control unit 10 determines that the position information of a person has been acquired (S2: YES), it determines that the person is present (S3) and ends the process.

[0046] On the other hand, when the control unit 10 determines that the position information of a person cannot be acquired (S2: NO), it determines whether to use the acquired number of DoAs as the DoA for absence determination (S4). The process of S4 is executed by the DoA accumulation determination unit 23.

[0047] When the control unit 10 determines to use the acquired number of DoAs as the DoA for absence determination (S4: YES), it accumulates the number of DoAs in the DoA accumulation unit 24 (S5). Then, the control unit 10 calculates the number of DoAs for absence determination from the accumulated number of DoAs (S6). The process of S6 is executed by the absence determination DoA number calculation unit 25.

[0048] On the other hand, when the control unit 10 does not use the acquired number of DoAs as the DoA for absence determination (S4: NO), it proceeds to the process of S6 and calculates the number of DoAs for absence determination from the accumulated number of DoAs. That is, when the acquired number of DoAs is not used as the DoA for absence determination, the number of DoAs for absence determination is calculated from the number of DoAs accumulated so far.

[0049] Next, the control unit 10 compares the number of DoAs for absence determination with the acquired number of DoAs (S7) and determines whether the acquired number of DoAs is greater than the number of DoAs for absence determination (S8).

[0050] When the control unit 10 determines that the acquired number of DoAs is not greater than the number of DoAs for absence determination (S8: NO), it determines that the person is absent (S9) and ends the process. On the other hand, when the control unit 10 determines that the acquired number of DoAs is greater than the number of DoAs for absence determination (S8: YES), it proceeds to the process of S3, determines that the person is present, and ends the process. The processes of S3, S7, S8, and S9 are executed by the presence determination unit 26.

[0051] Next, the determination process of whether to accumulate the acquired number of DoAs will be described. FIG. 5 is a flowchart showing an example of the determination process of whether to accumulate the number of DoAs.

[0052] First, the control unit 10 acquires a plurality of distance-angle information (DoAs) from the sensor 18 (S11). The position information acquisition unit 21 acquires the position information of a person (moving body) from the acquired plurality of DoAs. Also, the DoA number acquisition unit 22 acquires the number of the acquired plurality of DoAs (DoA number).

[0053] The control unit 10 determines whether the position information can be acquired by the position information acquisition unit 21 (S12). When the control unit 10 determines that the position information has been acquired (S12: YES), it does not accumulate the DoA number (S13) and ends the process.

[0054] On the other hand, when the control unit 10 determines that the position information cannot be acquired (S12: NO), it accumulates the DoA number (S14). After that, the control unit 10 calculates the DoA number for absence determination from the accumulated DoA number (S15).

[0055] In this way, the DoA number detected during the time when the sensor 18 does not detect the position information of a person is the target for calculating the DoA number for absence determination. On the other hand, the DoA number detected during the time when the sensor 18 detects the position information of a person is not the target for calculating the DoA number for absence determination.

[0056] As a result, the DoA number detected during the time period when there is a high possibility that a person is not in the room is accumulated, and the DoA number (threshold value) for absence determination is calculated. Note that whether to accumulate the DoA number may be determined by the processes shown in FIGS. 6 to 10.

[0057] FIG. 6 is a flowchart showing another example of the determination process of whether to accumulate the DoA number. In FIG. 6, the same processes as those in FIG. 5 are denoted by the same reference numerals and the description thereof is omitted.

[0058] When the control unit 10 determines in the process of S12 that the position information of a person cannot be obtained, it determines whether a remote control event has occurred within a predetermined time (S21). A remote control event, which means that a signal for operating the receiving device 1 using the remote control 34 has been detected, is obtained by the remote control event acquisition unit 14 and input to the control unit 10.

[0059] When the control unit 10 determines that a remote control event has occurred within a predetermined time (S21: YES), it proceeds to the process of S13 and does not accumulate the number of DoAs. On the other hand, when the control unit 10 determines that a remote control event has not occurred within a predetermined time (S21: NO), it proceeds to the process of S14 and accumulates the number of DoAs. Specifically, when a remote control event occurs and a predetermined time has not elapsed thereafter, the control unit 10 determines that the remote control event has occurred within a predetermined time. On the other hand, when a remote control event occurs and a predetermined time has elapsed thereafter, the control unit 10 determines that the remote control event has not occurred within a predetermined time.

[0060] When a remote control event occurs, it can be considered that a person exists in the space (indoors). Therefore, after a remote control event occurs, the predetermined time excludes the obtained number of DoAs from the calculation of the number of DoAs for absence determination.

[0061] On the other hand, when a remote control event has not occurred, it is highly likely that no person is present. Therefore, when a predetermined time has elapsed after a remote control event has occurred and the sensor 18 has not detected a person, the obtained number of DoAs is subject to the calculation of the number of DoAs for absence determination.

[0062] FIG. 7 is a flowchart showing another example of the determination process of whether to accumulate the number of DoAs. In FIG. 7, the same processes as those in FIG. 6 are denoted by the same reference numerals and the description thereof is omitted.

[0063] In the process of S21, when the control unit 10 determines that there is no remote control event within a predetermined time, it determines whether it is the time zone and day of the week during which it is usually watched (S31). The control unit 10 refers to the action history information stored in the action history storage unit 15 to determine whether it is the time zone and day of the week when the receiving device 1 is usually used.

[0064] When the control unit 10 determines that it is the time zone and day of the week during which it is usually watched (S31: YES), it proceeds to the process of S13 and does not accumulate the number of DoAs. On the other hand, when the control unit 10 determines that it is not the time zone and day of the week during which it is usually watched (S31: NO), it proceeds to the process of S14 and accumulates the number of DoAs.

[0065] Generally, there is a habit in the time zone and day of the week of watching TV. Therefore, regarding the time zone and day of the week during which it is usually watched, even if the sensor 18 does not detect a person, the obtained number of DoAs is excluded from the calculation of the number of DoAs for absence determination.

[0066] On the other hand, regarding the time zone and day of the week during which it is not usually watched, the obtained number of DoAs is subject to the calculation of the number of DoAs for absence determination.

[0067] Figure 8 is a flowchart showing another example of the determination process of whether to accumulate the number of DoAs. In Figure 8, the same processes as those in Figure 5 are denoted by the same reference numerals and the description thereof is omitted.

[0068] In the process of S12, when the control unit 10 determines that the position information of a person cannot be obtained, it determines whether the panel of the monitor 2 is OFF (S41). The control unit 10 determines whether the panel of the monitor 2 is OFF based on the detection result of the device state detection unit 13.

[0069] When the control unit 10 determines that the panel of the monitor 2 is not OFF (S41: NO), it proceeds to the process of S13 and does not accumulate the number of DoAs. On the other hand, when the control unit 10 determines that the panel of the monitor 2 is OFF (S41: YES), it weights the obtained number of DoAs and accumulates it (S42).

[0070] When the panel of the monitor 2 is on, it is highly likely that a person is present. Therefore, the obtained DoA counts are excluded from the calculation of the DoA counts for absence determination.

[0071] On the other hand, when the panel of the monitor 2 is off, it is highly likely that no person is present. Therefore, when the sensor 18 does not detect a person, the obtained DoA counts are used as targets for the calculation of the DoA counts for absence determination, and the DoA counts are weighted as more reliable information. For example, when the obtained DoA count is "5", it is determined that the obtained DoA count is a more reliable value as the DoA count when a person is absent, and "5" is accumulated multiple times as the DoA count to be accumulated in the DoA accumulation unit 24. As a result, the DoA count (threshold value) for absence determination calculated by the absence determination DoA count calculation unit 25 approaches the DoA count when a person is absent, and thus becomes a more accurate value.

[0072] FIG. 9 is a flowchart showing another example of the determination process for whether to accumulate DoA counts. In FIG. 9, the same processes as those in FIG. 5 are denoted by the same reference numerals and the description thereof is omitted.

[0073] In the process of S12, when the control unit 10 determines that the position information of a person cannot be obtained, the control unit 10 acquires the detection result of the brightness detection unit 16 (S51). Subsequently, the control unit 10 determines whether the room is bright based on the detection result of the brightness detection unit 16 (S52).

[0074] When the control unit 10 determines that the room is bright (S52: YES), it proceeds to the process of S13 and does not accumulate the number of DoAs. On the other hand, when the control unit 10 determines that the room is not bright (S52: NO), it proceeds to the process of S14 and accumulates the number of DoAs. For example, when the lighting is on, the control unit 10 determines that the room is bright, and when the lighting is off, the control unit 10 determines that the room is not bright. Generally, the brightness of the living room where the television receiver 1 is installed is suitably 30 to 75 lx. Therefore, the control unit 10 may determine that the room is bright when the brightness detected by the brightness detection unit 16 is 30 lx or more, and determine that the room is not bright when it is less than 30 lx. Alternatively, the control unit 10 may determine that the room is bright when the brightness detected by the brightness detection unit 16 is 30 to 75 lx, and determine that the room is not bright when it is outside the range of 30 to 75 lx.

[0075] When the brightness is detected by the brightness detection unit 16 and it is determined that the room is bright, there is a high possibility that a person is present. Therefore, even if the sensor 18 does not detect a person, the acquired number of DoAs is excluded from the calculation of the number of DoAs for absence determination.

[0076] On the other hand, when it is determined that the room is dark, there is a high possibility that no person is present. Therefore, when the sensor 18 does not detect a person, the acquired number of DoAs is used as an object for calculating the number of DoAs for absence determination.

[0077] FIG. 10 is a flowchart showing another example of the determination process of whether to accumulate the number of DoAs. In FIG. 10, the same processes as those in FIG. 5 are denoted by the same reference numerals and the description thereof is omitted.

[0078] In the process of S12, when the control unit 10 determines that the position information of a person cannot be acquired, it acquires the detection result of the detection unit 17 (S61). Subsequently, the control unit 10 determines whether video content is input via the recorder 35 or the network line 36 based on the detection result of the detection unit 17 (S62).

[0079] When the control unit 10 determines that video content is being input via the recorder 35 or the network line 36 (S62: YES), the process proceeds to the process of S13, and the number of DoAs is not accumulated. On the other hand, when the control unit 10 determines that video content is not being input via the recorder 35 or the network line 36 (S62: NO), the process proceeds to the process of S14, and the number of DoAs is accumulated.

[0080] During the playback of the video recorded in the recorder 35 or during the playback of the video recorded in the server 37 via the network line 36, it is highly likely that there are people in the room. Therefore, even if no person is detected by the sensor 18, the acquired number of DoAs is excluded from the calculation of the number of DoAs for absence determination.

[0081] On the other hand, when the video recorded in the recorder 35 or the like is not being played back, there is also a possibility that the program received by the tuner 31 is being viewed, and it cannot be said for sure that there is no person. Therefore, when the sensor 18 does not detect a person, the acquired number of DoAs is subject to the calculation of the number of DoAs for absence determination.

[0082] As described above, when it is highly likely that there is no person, that is, when the sensor 18 does not detect a person, the detected number of DoAs is accumulated, and when it is highly likely that there is a person, the detected number of DoAs is not accumulated. By excluding the number of DoAs in the situation where there is a person from the calculation target of the number of DoAs for absence determination in this way, it becomes possible to accumulate a more accurate number of DoAs. Then, the number of DoAs (threshold value) for absence determination is calculated based on the number of DoAs accumulated in this way.

[0083] Even when the control unit 10 cannot detect the position information of a person by the sensor 18, if the number of DoAs detected by the sensor 18 exceeds the threshold value, it determines that there is a person in the space. As a result, even when there is a person in the non-detection area 52 of the sensor 18 where the person cannot be detected because it is outside the detection area of the sensor 18, the presence of the person can be accurately determined by a single sensor. Therefore, the receiving device 1 of the present embodiment can expand the range in which the presence of a person is detected by a single sensor.

[0084] In addition, each step in the flowchart in this specification may change the execution order, execute multiple steps simultaneously, or execute in a different order each time, as long as it does not violate the nature thereof.

[0085] Although some embodiments of the invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0086] 1... Receiving device, 2... Monitor, 3... Speaker, 4... Receiving unit, 5... Connection unit, 6... Communication unit, 10... Control unit, 11... Tuner, 12... Memory, 13... Device state detection unit, 14... Remote control event acquisition unit, 15... Action history storage unit, 16... Brightness detection unit, 17... Detection unit, 18... Sensor, 21... Position information acquisition unit, 22... DoA acquisition unit, 23... DoA accumulation determination unit, 24... DoA accumulation unit, 25... Absence determination DoA number calculation unit, 26... Presence determination unit, 31... Antenna, 34... Remote control, 35... Recorder, 36... Network line, 37... Server, 41... Modulation signal generator, 42... Transmission antenna, 43a to 43c... Reception antennas, 44a to 44c... Mixers, 45a to 45c... ADCs, 46... DSP, 100... Television receiving device.

Claims

1. A sensor for acquiring a plurality of pieces of distance and angle information; an accumulation determination unit that determines whether or not to accumulate the number of the plurality of pieces of distance angle information; a storage unit that stores the number of pieces of distance-angle information determined to be stored by the storage determination unit; a calculation unit that calculates a threshold value for determining absence by using the number of the plurality of pieces of distance angle information stored in the storage unit; A receiving device having a presence determination unit that compares the number of the multiple pieces of distance angle information with a threshold for determining absence, and determines that a person is present if it is determined that the number of the multiple pieces of distance angle information is greater than or equal to the threshold.

2. a position information acquisition unit that acquires position information of a person from the plurality of pieces of distance angle information; The receiving device according to claim 1 , wherein the accumulation determination unit determines whether or not to accumulate the number of the plurality of pieces of distance angle information in the accumulation unit based on whether or not the position information acquisition unit has acquired the position information of the person.

3. A remote control event acquisition unit that acquires a remote control event indicating that a remote control has been operated, The receiving device according to claim 1 , wherein the accumulation determining unit determines whether or not to accumulate the number of the plurality of pieces of distance-angle information in the accumulation unit, based on whether or not the remote control event has been acquired by the remote control event acquiring unit.

4. A behavior history storage unit that stores behavior history information of a user, The receiving device according to claim 1 , wherein the accumulation determination unit determines whether or not to accumulate the number of the plurality of pieces of distance angle information in the accumulation unit, based on the behavior history information accumulated in the behavior history accumulation unit.

5. A device state detection unit detects the ON / OFF state of a monitor panel, The receiving device according to claim 1 , wherein the accumulation determining unit determines whether or not to accumulate the number of the plurality of pieces of distance-angle information in the accumulation unit based on a detection result of the device state detecting unit.

6. The receiving device according to claim 5 , wherein the accumulation determining unit accumulates the number of the plurality of pieces of distance and angle information in the accumulation unit a plurality of times when the device state detecting unit detects that the panel of the monitor is in an OFF state.

7. A brightness detection unit detects the brightness of a room, The receiving device according to claim 1 , wherein the accumulation determining unit determines whether or not to accumulate the number of the plurality of pieces of distance angle information in the accumulation unit based on a detection result of the brightness detecting unit.

8. A detection unit detects whether video content is being input via a recorder or an internet line, The receiving device according to claim 1 , wherein the accumulation determining unit determines whether or not to accumulate the number of the plurality of pieces of distance angle information in the accumulation unit based on a detection result of the detection unit.

9. Acquire multiple distance and angle information, determining whether to accumulate the number of the plurality of pieces of distance and angle information; storing the number of the plurality of pieces of distance-angle information determined to be stored in a storage unit; Calculating a threshold value for determining absence using the number of the plurality of pieces of distance angle information stored in the storage unit; A control method for a receiving device, which compares the number of the plurality of pieces of distance angle information with a threshold value for determining absence, and determines that a person is present when it is determined that the number of the plurality of pieces of distance angle information is equal to or greater than the threshold value.

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