JP2017220795A - Video door phone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video door phone device that reduces power consumption by stably performing radio communication between an entrance slave unit and a radio master unit.SOLUTION: An indoor master unit 200 confirms whether a communication error has occurred regarding image data received from an entrance slave unit 100, and confirms whether there is an idle slot to be a movement destination if a communication error has occurred. If there is not a slot to be the movement destination, the indoor master unit 200 transmits a disconnection request for an image call to the entrance slave unit 100, and thereby controls the number of connections of the image call. This allows a video door phone device 10 to change image quality (a frame rate, a compression ratio, or an image size) depending on a radio wave condition.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a television door phone device.

  Awareness of crime prevention has been increasing year by year, and in recent years there has been an increasing demand for realizing low cost, easy installation, etc. not only in detached houses but also in single-living households such as studio apartments.

  In order to meet such a demand for simple installation at low cost, wireless communication between an entrance slave unit and a wireless master unit is unnecessary and wiring work between the two is unnecessary. For example, Patent Literature 1 discloses a television door phone device that performs wireless communication using Bluetooth (registered trademark) between an entrance slave device and a wireless master device.

JP 2007-142808 A

  However, although the television doorphone device disclosed in Patent Document 1 described above can perform high-speed data communication, since it is specialized in short-range communication, the distance between the entrance slave unit and the wireless master unit, or the entrance slave unit, Depending on the structure (such as a wall of a house or a pillar) between the base station and the base station, radio waves may be attenuated, making communication difficult and increasing power consumption.

  An object of the present invention is to provide a television door phone device that stably performs wireless communication between an entrance slave device and a wireless master device to reduce power consumption.

  A TV door phone apparatus according to one embodiment of the present invention is a TV door phone apparatus that performs DECT wireless communication using a time-division multiplex communication method between a slave unit and a master unit. When image data is received and displayed at the first image quality from the machine and a communication error occurs, the image data is received and displayed at a second image quality lower than the first image quality from the child machine. Take the configuration.

  ADVANTAGE OF THE INVENTION According to this invention, radio | wireless communication with an entrance subunit | mobile_unit and a wireless main | base station can be performed stably and reduction of power consumption can be aimed at.

The figure which shows the television door phone apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structural example of the entrance cordless handset which concerns on Embodiment 1 of this invention. The block diagram which shows the structural example of the indoor main | base station which concerns on Embodiment 1 of this invention. The sequence diagram which shows the procedure in which the call button of the front door unit of Embodiment 1 of the present invention is pressed and the front door unit and the indoor base unit are connected. The sequence diagram which shows the other procedure which the call button of the front door subunit | mobile_unit of Embodiment 1 of this invention is pressed, and connects an front door subunit | mobile_unit and an indoor main | base station. The sequence diagram which shows the procedure in which the monitor button of the indoor main | base station of Embodiment 1 of this invention is pressed down and an entrance cordless handset and an indoor base unit are connected. The sequence diagram which shows the other procedure which connects the entrance cordless handset and an indoor base unit when the monitor button of the indoor base unit of Embodiment 1 of this invention is pressed down The figure which shows the example of allocation of the slot in 1 frame The figure which shows the other example of allocation of the slot in 1 frame The sequence diagram which shows the procedure which connects the entrance cordless handset and the indoor base unit when the call button of the entrance cordless handset of Embodiment 2 of this invention is pressed down The sequence diagram which shows the other procedure which connects the entrance cordless handset and an indoor base unit when the call button of the entrance cordless handset of Embodiment 2 of this invention is pressed down The sequence diagram which shows the procedure which connects the entrance cordless handset and an indoor base unit when the monitor button of the indoor base unit of Embodiment 2 of this invention is pressed down The sequence diagram which shows the other procedure which connects the entrance cordless handset and an indoor base unit when the monitor button of the indoor base unit of Embodiment 2 of this invention is pressed down Control flow diagram of indoor parent device according to embodiment 2 of the present invention

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

(Embodiment 1)
FIG. 1 is a diagram showing a television door phone device 10 according to Embodiment 1 of the present invention. As shown in FIG. 1, the television door phone device 10 includes an entrance cordless handset 100 and an indoor base phone 200. The entrance cordless handset 100 is provided outdoors, for example, near the entrance door, and the indoor base unit 200 is provided indoors. A structure such as a wall of a house exists between the entrance slave device 100 and the indoor master device 200.

  FIG. 2 is a block diagram illustrating a configuration example of the entrance cordless handset 100 according to Embodiment 1 of the present invention.

<Configuration of entrance cordless handset>
The entrance slave device 100 includes a wireless communication unit 101, a control unit 102, an operation unit 103, a power supply unit 104, an imaging unit 105, a voice input / output unit 106, a storage unit 107, and an interrupt detection unit 108.

  The wireless communication unit 101 communicates with the indoor parent device 200 via a wireless line. The communication method by the wireless communication unit 101 is a time division multiplexing communication method using a frequency band of 1.9 GHz such as 1880 MHz to 1930 MHz, such as DECT (Digital Enhanced Cordless Communications). According to this communication method, it is possible to reduce power consumption by limiting the communication time with the indoor parent device 200 by providing a sleep state or the like, and it is possible to deliver a radio wave relatively far from the characteristics of the frequency band. In the following description, the DECT method is used as the communication method.

  The wireless communication unit 101 transmits data of an image captured by the imaging unit 105 (hereinafter referred to as “captured image”) to the indoor parent device 200 by the DECT method. Thereby, an indoor resident can visually recognize a visitor existing near the entrance door. In addition, the wireless communication unit 101 transmits voice information including the voice of the visitor collected by the voice input / output unit 106 of the entrance cordless handset 100 to the indoor base unit 200 by the DECT method. Moreover, the wireless communication part 101 receives the audio | voice information containing a resident's audio | voice from the indoor main | base station 200 by a DECT system. Thereby, an outdoor visitor and an indoor resident can talk.

  The control unit 102 includes a ROM (Read Only Memory), a RAM (Random Access Memory), a CPU (Central Processing Unit), and the like. For example, various functions of the control unit 102 are realized by the CPU executing programs stored in the ROM.

  The control unit 102 controls the entire entrance cordless handset 100, and executes various controls, calculations, and determinations. The control unit 102 performs a calculation process for controlling each unit of the entrance cordless handset 100.

  The operation unit 103 is, for example, a call button, and when pressed by a visitor, notifies the indoor parent device 200 of the presence of the visitor via the wireless communication unit 101.

  The power supply unit 104 supplies power for operating the entrance slave device 100 to each unit. The power supply unit 104 is configured by a battery such as a primary battery or a secondary battery in consideration of installation. However, the power supply unit 104 is not limited to this, and power may be input from an AC power supply or an AC adapter via a power cable.

  The imaging unit 105 images a predetermined space outdoors. The image captured by the imaging unit 105 includes, for example, a moving image and a still image, and the captured image includes a visitor, a passerby, a suspicious person, an object other than a person, and the like.

  The voice input / output unit 106 is a microphone, a speaker, or the like, collects voice information including a visitor's voice, and transmits the voice information to the indoor parent device 200 via the wireless communication unit 101. The voice input / output unit 106 outputs voice information including the voice of the resident transmitted from the indoor parent device 200.

  The storage unit 107 is configured by a flash memory or the like, and includes, for example, device information such as an identification number of the entrance slave device 100, setting information, status information of the indoor parent device 200, image data before being transmitted to the indoor parent device 200, and the like. Remember.

  The interrupt detection unit 108 detects key interrupts such as buttons provided in the entrance slave device 100, interrupts by a timer, and interrupts by various events. Interrupt detection includes hardware and software detection.

  The interrupt detection unit 108 also has a function of controlling power supply to each unit by the power supply unit 104 in order to realize ultra-low power consumption. For example, the interrupt detection unit 108 is positioned between the power supply unit 104 and each unit such as the control unit 102 on the circuit, and only the interrupt detection unit 108 is always operated by the weak power of the power supply unit 104. Then, the interrupt detection unit 108 turns on / off the switching element to supply power to each unit based on detection of a predetermined interrupt.

<Configuration of indoor unit>
FIG. 3 is a block diagram showing a configuration example of the indoor parent device 200 according to Embodiment 1 of the present invention.

  The indoor parent device 200 includes a wireless communication unit 201, a control unit 202, an operation unit 203, a power supply unit 204, an RSSI level detection unit 205, a display unit 206, a voice input / output unit 207, a storage unit 208, a charge detection unit 209, and an interrupt detection. The unit 210 is provided.

  The wireless communication unit 201 communicates with the entrance slave device 100 via a wireless line. A communication method by the wireless communication unit 201 is a DECT method (a time division multiplex communication method using a frequency band of 1.9 GHz such as 1880 MHz to 1930 MHz). According to this communication method, it is possible to reduce the power consumption by limiting the communication time with the entrance cordless handset 100 by providing a sleep state or the like, and it is possible to deliver a radio wave relatively far from the characteristics of the frequency band. The wireless communication unit 201 transmits the reference control signal at a constant cycle.

  The wireless communication unit 201 receives the image data transmitted from the entrance slave device 100 by the DECT method. Thereby, an indoor resident can visually recognize a visitor existing near the entrance door. Further, the wireless communication unit 201 receives voice information including the voice of the visitor from the entrance cordless handset 100 by the DECT method. In addition, the wireless communication unit 201 transmits voice information including the resident's voice collected by the voice input / output unit 207 of the indoor base unit 200 to the entrance terminal 100 by the DECT method. Thereby, an outdoor visitor and an indoor resident can talk.

  The control unit 202 includes a ROM, a RAM, a CPU, and the like. For example, the CPU 202 implements various functions of the control unit 202 by executing programs stored in the ROM.

  The control unit 202 controls the entire indoor parent device 200 and executes various controls, calculations, and determinations. The control unit 202 performs arithmetic processing for controlling each unit of the indoor parent device 200.

  In particular, the control unit 202 confirms the radio wave status using the image call connection request received from the entrance slave device 100, and transmits an image call connection response to the entrance slave device 100 when the radio wave status is good. When the situation is deteriorated, the number of connected image calls is controlled by transmitting an image call connection rejection response to the front door device 100. Thereby, the television door phone apparatus 10 can change the transmission speed of image data. In the present embodiment, the number of slots and channels used for communication may be increased or decreased without being limited to the number of video call connections.

  The operation unit 203 includes various buttons. For example, a response button for responding when the presence of a visitor is notified from the entrance terminal 100, a monitor button for acquiring image data from the entrance terminal 100, an entrance A button for controlling the child device 100.

  The power supply unit 204 supplies power for operating the indoor parent device 200 to each unit. The power supply unit 204 may be configured by a battery such as a primary battery or a secondary battery in consideration of installation properties when power is input from an AC power supply or an AC adapter.

  The RSSI level detection unit 205 detects the strength of the signal received by the wireless communication unit 201 from the entrance terminal 100, that is, the received signal strength indicator (RSSI) level.

  The display unit 206 includes, for example, an LCD (Liquid Crystal Display) and displays various characters or images. The image includes, for example, a moving image and a still image, and includes a captured image from the front door device 100 and an image for operating the indoor parent device 200.

  The voice input / output unit 207 is a microphone, a speaker, or the like, collects voice information including the resident's voice, and transmits the voice information to the entrance cordless handset 100 via the wireless communication unit 201. Further, the voice input / output unit 207 outputs voice information including the voice of the visitor transmitted from the entrance cordless handset 100.

  The storage unit 208 includes a flash memory and the like, and includes various images, sounds, and other management information. The image includes, for example, a moving image and a still image, and includes a captured image from the front door device 100 and an image for operating the indoor parent device 200. The voice includes, for example, a voice of a standard message issued from the indoor parent device 200.

  The other management information includes, for example, password information for preventing various setting information of the indoor parent device 200 from being changed without permission.

  The charge detection unit 209 detects whether the indoor parent device 200 is placed on a charging stand or the like and the power supply unit 204 is connected to an external power supply.

  The interrupt detection unit 210 detects key interrupts such as buttons provided in the indoor parent device 200, timer interrupts, and interrupts caused by various events. Interrupt detection includes hardware and software detection.

  The interrupt detection unit 210 also includes an ultra-low power consumption mode for controlling power supply to each unit by the power supply unit 204 in order to achieve ultra-low power consumption. For example, the interrupt detection unit 210 is positioned between the power supply unit 204 and each unit such as the control unit 202 on the circuit, and only the interrupt detection unit 210 is always operated by the weak power of the power supply unit 204. Then, the interrupt detection unit 210 turns on / off the switching element to supply power to each unit based on detection of a predetermined interrupt.

<Connection procedure>
Next, a connection procedure for wirelessly connecting the entrance slave device 100 and the indoor master device 200 in the present embodiment will be described. FIG. 4 is a sequence diagram showing a procedure for connecting the front door device 100 and the indoor base device 200 when the call button of the front door device 100 is pressed. Although not explicitly shown in FIG. 4, the indoor parent device 200 periodically transmits a reference control signal.

  In step S401, when the call button is pressed in the entrance slave device 100, the entrance slave device 100 searches for the reference control signal transmitted from the indoor master device 200 and establishes communication synchronization. In step S402, the entrance slave device 100 A voice call connection request is transmitted to the indoor base unit 200. In step S403, the indoor parent device 200 transmits a voice call connection response to the front door device 100. Thereby, the visit of the visitor is notified to the indoor parent device 200.

  In step S404, the entrance slave device 100 transmits an image call 1 connection request to the indoor master device 200, and in step S405, the indoor master device 200 transmits an image call 1 connection response to the entrance slave device 100.

  Similarly, in steps S406 to S411, connection requests and connection responses for the image calls 2 to 4 are transmitted and received between the front door device 100 and the indoor parent device 200.

  Here, since there are four image calls and all of them are connected, it is possible to transmit and receive image data at the maximum transmission rate between the front door device 100 and the indoor base device 200.

  FIG. 5 is a sequence diagram showing another procedure for connecting the entrance slave device 100 and the indoor master device 200 when the call button of the entrance slave device 100 is pressed. 5 that are the same as those in FIG. 4 are assigned the same reference numerals as those in FIG. 4 and redundant descriptions are omitted.

  In step S <b> 408, the entrance slave device 100 transmits an image call 3 connection request to the indoor master device 200. At this time, if the radio wave condition has deteriorated due to radio wave interference or the like, the indoor parent device 200 transmits an image call 3 connection rejection response to the front child device 100 in step S501. Thus, in the television door phone device 10, the number of image call connections is increased or decreased according to the radio wave condition, and the transmission rate of image data is variable. The number of slots and channels used for communication may be increased or decreased without being limited to the number of video call connections.

  As a result, the entrance slave device 100 and the indoor master device 200 transmit and receive image data at a reduced transmission rate. After a certain period of time has elapsed since the front door device 100 received the image call 3 connection rejection response, it requests the extension of the transmission rate again. That is, in step S502, the entrance child device 100 transmits an image call 3 connection request to the indoor parent device 200. Again, in step S503, the indoor parent device 200 transmits an image call 3 connection rejection response to the front door device 100.

  FIG. 6 is a sequence diagram showing a procedure for connecting the entrance slave device 100 and the indoor master device 200 when the monitor button of the indoor master device 200 is pressed. However, in FIG. 6, the same reference numerals as those in FIG. Although not explicitly shown in FIG. 6, the indoor parent device 200 periodically transmits a reference control signal. For example, when the front door device 100 is driven by a battery, the front door device 100 may be configured to receive a reference control signal by periodically canceling the sleep state in a sleep state at normal times. With this configuration, it is possible to perform the monitoring operation from the indoor parent device 200 while reducing the power consumption of the front child device 100 even when the front child device 100 is battery-driven.

  In step S601, the monitor button is pressed in the indoor parent device 200, and when the entrance child device 100 searches for the reference control signal transmitted from the indoor parent device 200 and establishes communication synchronization, in step S602, the indoor parent device 200. Transmits a camera connection request to the front door device 100. In step S603, the entrance child device 100 transmits a camera connection response to the indoor parent device 200, and steps S402 to S411 are executed.

  Furthermore, FIG. 7 is a sequence diagram showing another procedure for connecting the entrance cordless handset 100 and the indoor base unit 200 when the monitor button of the indoor base unit 200 is pressed. However, in FIG. 7, the same reference numerals as those in FIG.

  In step S <b> 408, the entrance slave device 100 transmits an image call 3 connection request to the indoor master device 200. At this time, if the radio wave condition has deteriorated due to radio wave interference or the like, the indoor parent device 200 transmits an image call 3 connection rejection response to the front child device 100 in step S701. Thus, in the television door phone device 10, the number of image call connections is increased or decreased according to the radio wave condition, and the transmission rate of image data is variable. The number of slots and channels used for communication may be increased or decreased without being limited to the number of video call connections.

  As a result, the entrance slave device 100 and the indoor master device 200 transmit and receive image data at a reduced transmission rate. After a certain period of time has elapsed since the front door device 100 received the image call 3 connection rejection response, it requests the extension of the transmission rate again. That is, in step S <b> 702, the entrance child device 100 transmits an image call 3 connection request to the indoor parent device 200. Here again, it is assumed that the indoor parent device 200 transmits an image call 3 connection rejection response to the front door device 100 in step S703.

  In the connection procedures shown in FIGS. 4 to 7, it has been described that the image call is connected after the voice call is connected. However, the image call is connected and the indoor visitor 200 is notified of the visit of the visitor. A voice call may be connected later.

  Next, an example of slot use in the DECT method will be described. FIG. 8 is a diagram illustrating an example of allocation of slots in one frame. FIG. 8 shows an example in which one frame is composed of 24 slots S1 to S24. Here, the slot S1 is assigned to transmission of audio data from the entrance slave device 100, and the slot (pair slot) S13 paired with the slot S1 is assigned to transmission of audio data from the indoor parent device 200. That is, symmetric communication is used for voice communication.

  Further, the slot S3 is assigned to transmission of image data from the entrance slave unit 100, and a slot (pair slot) S15 paired with the slot S3 is also assigned to transmission of image data from the entrance slave unit 100. That is, asymmetric communication is used for image communication.

  Further, the slots S4 to S12 are in a sleep state, and by periodically providing the sleep state, the power consumption of the entrance slave device 100 can be suppressed, and the entrance slave device 100 can be battery driven. In addition, the television door phone apparatus 10 may be provided with a mode for prolonging the sleep state. In this case, the power consumption of the front door device 100 can be further suppressed. Moreover, the TV door phone apparatus 10 may be provided with a mode in which the indoor parent device 200 responds only when the call button of the front door device 100 is pressed. In this case, the power consumption of the front door device 100 is further suppressed. be able to.

  In addition, when the indoor master unit of the TV door phone apparatus 10 starts communication with the entrance slave unit, the indoor master unit checks whether there is an empty slot and uses it for communication from the slots that are confirmed as empty. Select the slot and notify the entrance cordless handset to establish communication with the entrance cordless handset.

  Further, when there are a plurality of entrance cordless handsets, the indoor master unit of the TV door phone apparatus 10 assigns the slot S1 to the first entrance cordless handset, assigns the slot S2 to the second entrance cordless handset, and assigns the slot Sn to the nth number. It may be assigned to the entrance cordless machine. Thereby, indoor main unit 200 can communicate with a plurality of entrance sub units.

  Further, in the TV door phone apparatus 10, when there are a plurality of indoor base units, the slot S1 is assigned to the first indoor base unit, the slot S2 is assigned to the second indoor base unit, and the slot Sn is assigned to the nth indoor base unit. May be assigned. As a result, the entrance slave device 100 can communicate with a plurality of indoor master devices.

  Further, as shown in FIG. 9, the television door phone apparatus 10 may assign a plurality of pair slots to one entrance cordless handset in voice communication or image communication. In FIG. 9, slot S <b> 1 is assigned to transmission of audio data from the entrance slave device 100, and a slot (pair slot) S <b> 13 paired with the slot S <b> 1 is assigned to transmission of audio data from the indoor parent device 200. Further, the slot S2 is assigned to transmission of audio data from the entrance slave device 100, and the slot (additional pair slot) S14 paired with the slot S2 is assigned to transmission of audio data from the indoor parent device 200.

  Further, the slot S5 is assigned to transmission of image data from the front door device 100, and the slot (pair slot) S17 paired with the slot S5 is also assigned to transmission of image data from the front door device 100. Further, the slot S7 is assigned to transmission of image data from the front door slave device 100, and a slot (additional pair slot) S19 that is paired with the slot S7 is also assigned to transmission of image data from the front door slave device 100.

  As described above, according to the present embodiment, by using a frequency band of 1.9 GHz band such as the DECT method and a time-division multiplexing communication method for wireless communication between the entrance slave device 100 and the indoor master device 200, the entrance Even if the distance between the child device 100 and the indoor parent device 200 is large, or the radio wave shielding effect of the structure between the front child device 100 and the indoor parent device 200 is high, the front child device 100 can be seen from the frequency characteristics. Wireless communication with the wireless master device 200 can be performed stably, and power consumption can be reduced by appropriately entering a sleep state. Note that when applied to the indoor propagation model based on ITU-R P.1238-6, the 2.4 GHz band frequency band capable of high-speed data communication is used as the communication distance that allows stable communication. And about 30 m, when using a frequency band of 1.9 GHz band, it is about 80 m. Therefore, in order to practically use a wireless TV door phone in many living spaces, it is preferable to use a frequency band of 1.9 GHz band. Further, in order to practically use a wireless TV door phone, time division multiplex communication that can perform asymmetric communication using a plurality of slots for image communication with a large amount of data is preferable.

  In addition, the feature of a wireless TV door phone is the ease of installation by battery operation. In order to realize battery drive, a communication method that enables system operation with low power consumption, that is, communication sections are multiplexed in a time-sharing manner, and power is supplied only to sections that require power (ON operation), and power is not Time division multiplex communication that can perform a sleep operation in a necessary section is appropriate. It should be noted that other communication systems can be used in a system in which the slave unit is normally in a sleep state and operates only when an interrupt signal is generated. However, in the system that performs image communication by wireless notification from the master unit to the slave unit, both the master unit and the slave unit must be started periodically, and the slave unit must periodically monitor notifications from the master unit. It is preferable to use time division multiplex communication capable of time management.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. Note that in Embodiment 2, the configuration of the TV door phone device, the configuration of the front door unit, and the configuration of the indoor base unit are the same as those in Embodiment 1, and thus the description thereof is omitted. The indoor parent device 200 according to the second embodiment is different from the indoor parent device 200 according to the first embodiment in the processing content of the control unit 202.

  In the present embodiment, the control unit 202 confirms whether or not a communication error has occurred with respect to the image data received from the front door device 100. If a communication error has occurred, the control unit 202 requests a slot movement request or an image call. By transmitting a disconnection request to the entrance cordless handset 100, the number of connected image calls is controlled. Thereby, the television door phone apparatus 10 can make image quality (a frame rate, a compression rate, an image size) variable according to a radio wave condition.

<Connection procedure>
Next, a connection procedure for wirelessly connecting the entrance slave device 100 and the indoor master device 200 in the present embodiment will be described. FIG. 10 is a sequence diagram illustrating a procedure for connecting the front door device 100 and the indoor base device 200 when the call button of the front door device 100 is pressed. However, in FIG. 10, the same reference numerals as those in FIG.

  10, steps S401 to S411 are the same as those in FIG. 4, and connection requests and connection responses for voice calls and image calls 1 to 4 are transmitted and received between the entrance slave device 100 and the indoor master device 200. . FIG. 10 shows a case where there are four image calls and all of them are connected.

  Thereafter, it is assumed that a communication error has occurred in the slot of image call 2. In this case, the indoor base unit 200 confirms whether there is an empty slot to be moved to. FIG. 10 shows a case where there is a destination slot (S801). In this case, in step S802, the indoor master device 200 transmits an image call 2-slot movement request to the entrance slave device 100, and in step S803, the entrance slave device 100 transmits an image call 2-slot move response to the indoor master device 200. . As a result, the communication slot is moved.

  Thereafter, after a certain period of time has elapsed since the entrance slave device 100 transmitted the image call 2-slot movement response, the image call 2 connection request is transmitted again to the indoor parent device 200 in step S804. In step S805, the indoor parent device 200 transmits an image call 2 connection response to the front door device 100. In this case, the entrance slave device 100 and the indoor master device 200 can continue to transmit and receive image data at the maximum transmission speed.

  FIG. 11 is a sequence diagram showing another procedure for connecting the entrance slave device 100 and the indoor master device 200 when the call button of the entrance slave device 100 is pressed. However, in FIG. 11, the same reference numerals as those in FIG.

  In FIG. 11, it is assumed that a communication error has occurred in the slot of the image call 4 after step S411. In this case, the indoor base unit 200 confirms whether there is an empty slot to be moved to. FIG. 11 shows a case where there is no destination slot (S901). In this case, the indoor parent device 200 transmits an image call 4 disconnection request to the entrance slave device 100 in step S902, and the entrance slave device 100 transmits an image call 4 disconnection response to the indoor master device 200 in step S903. As a result, the entrance slave device 100 and the indoor master device 200 transmit and receive image data at a reduced transmission rate.

  As described above, in the present embodiment, when a communication error occurs, the number of image call connections is increased or decreased according to the presence or absence of an empty slot, and the image data transmission rate is variable. The number of slots and channels used for communication may be increased or decreased without being limited to the number of video call connections.

  FIG. 12 is a sequence diagram illustrating a procedure for connecting the entrance slave device 100 and the indoor master device 200 when the monitor button of the indoor master device 200 is pressed. However, in FIG. 12, the same reference numerals as those in FIG. 6 and FIG. 10 are given to portions common to FIG. 6 and FIG.

  12, steps S601 to S603 and S402 to S411 are the same as those in FIG. 6, and connection requests and connection responses for voice calls and image calls 1 to 4 are performed between the entrance slave device 100 and the indoor master device 200. Are sent and received. FIG. 12 shows a case where there are four image calls and all of them are connected.

  In FIG. 12, steps S801 to S805 are the same as those in FIG. 10, and in this case, the entrance slave device 100 and the indoor master device 200 can continue to transmit and receive image data at the maximum transmission speed.

  FIG. 13 is a sequence diagram showing another procedure showing a procedure for connecting the front door slave device 100 and the indoor master device 200 when the monitor button of the indoor master device 200 is pressed. However, in FIG. 13, the same reference numerals as those in FIGS. 6 and 11 are given to portions common to FIGS. 6 and 11, and redundant description is omitted.

  13, steps S601 to S603 and S402 to S411 are the same as those in FIG. 6, and connection requests and connection responses for voice calls and image calls 1 to 4 are performed between the entrance slave device 100 and the indoor master device 200. Are sent and received. FIG. 13 shows a case where there are four image calls and all of them are connected.

  In FIG. 13, steps S901 to S903 are the same as those in FIG. 11. In this case, the entrance slave device 100 and the indoor master device 200 transmit and receive image data at a reduced transmission rate.

  10 to 13, the same effect can be obtained even if the image connection is performed first and the audio connection is performed later. 10 and 12, when a communication error occurs, instead of the indoor parent device 200 transmitting a slot movement request (S802), error information indicating the occurrence of a communication error is transmitted, and the front door device 100 A movement request may be transmitted. 10 and 12, the front door device 100 does not have to transmit the slot movement response (S803). In addition, in FIG. 11 and FIG. 13, the entrance cordless handset 100 may not transmit a disconnection response (S902).

<Indoor master unit control flow>
Next, a control flow of indoor parent device 200 in the present embodiment will be described with reference to FIG.

  In a state where communication with the front door device 100 is established, the control unit 202 confirms whether or not a communication error has occurred for the image data received from the front door device 100. If a communication error has not occurred (S1001: NO), the current state is maintained until communication with the front door device 100 is completed (S1005: NO, flow returns to S1001).

  When a communication error occurs (S1001: YES), the control unit 202 confirms whether there is an empty slot to be a movement destination. When there is an empty slot (S1002: YES), the control unit 202 transmits a slot movement request to the front door device 100 (S1003). On the other hand, when there is no empty slot (S1002: NO), the control unit 202 changes the image quality by controlling the number of connected image calls (S1004). After S1003 or S1004, the current state is maintained until communication with the front door device 100 is completed (S1005: NO, flow returns to S1001).

  As described above, according to the present embodiment, the number of connected image calls can be controlled according to whether or not a communication error has occurred, so that the image quality (frame rate, compression rate, image Size) can be made variable.

  Examples of lowering image quality include lowering the frame rate, increasing the image compression rate, and reducing the image size. When the frame rate is lowered, the image quality is maintained, but the motion of the image becomes slow. When the image compression rate is increased or the image size is reduced, the motion of the video is maintained, but the image quality is deteriorated.

  In the present embodiment, entrance slave device 100 searches for a reference control signal transmitted from indoor parent device 200 to establish communication synchronization, establishes a voice call, and allows visitor visit to indoor parent device 200. Although described as notification, the present invention is not limited to this. For example, when a call button is pressed in the entrance cordless handset 100, in response to the reference control signal transmitted from the indoor base unit 200, the visit to the indoor base unit 200 is notified, and a voice call and an image call are sequentially established. May be.

  Moreover, in this Embodiment, you may select the frequency band with low possibility of using with another system among several frequency bands as a frequency band which the television door phone apparatus 10 uses.

  Moreover, in this Embodiment, the power supply of the indoor main | base station 200 demonstrated that the power supply may be input from AC power supply or AC adapter, and may be comprised with a battery. When the power source of the indoor parent device 200 is configured by a battery, the indoor parent device 200 may perform the intermittent operation only when the indoor parent device 200 is disconnected from the external power source of the charging stand. Thereby, power consumption of indoor parent device 200 can be reduced.

  Further, when the indoor parent device 200 is disconnected from the external power source of the charging stand, the entrance child device 100 may be set to periodically enter the sleep state. Thereby, when communication synchronization between the entrance cordless handset 100 and the indoor base unit 200 is lost, it is easy to return, and the system can be stabilized.

  Furthermore, when the power source of the indoor parent device 200 is configured by a battery, the indoor parent device 200 notifies the entrance slave device 100 that it operates in the ultra-low power consumption mode compliant with DECT, and the ultra-low power consumption mode Migrate to

  INDUSTRIAL APPLICABILITY The present invention is useful for stably performing wireless communication between an entrance child device and a wireless parent device to reduce power consumption.

DESCRIPTION OF SYMBOLS 10 TV door phone apparatus 100 Entrance unit 101, 201 Wireless communication part 102, 202 Control part 103, 203 Operation part 104, 204 Power supply part 105 Imaging part 106, 207 Audio | voice input / output part 107, 208 Storage part 108, 210 Interrupt detection part 200 Indoor Master Unit 205 RSSI Level Detection Unit 206 Display Unit 209 Charge Detection Unit

Claims (3)

A television door phone device that performs DECT wireless communication using a time division multiplexing communication method between a slave unit and a master unit,
The base unit is
When image data is received and displayed at the first image quality from the slave unit and a communication error occurs, image data is received from the slave unit at a second image quality lower than the first image quality. indicate,
TV door phone device. A television door phone device that performs DECT wireless communication using a time division multiplexing communication method between a slave unit and a master unit,
The base unit is
Assigning a predetermined number of slots for transmitting audio data and a slot for transmitting image data from the slave unit to the master unit,
When a communication error occurs in the data received from the slave unit, the number of slots allocated to transmit the image data is reduced.
TV door phone device. The slave is
Driven by a battery, periodically canceling the sleep state and receiving a control signal from the master unit,
The television door phone apparatus according to claim 1 or 2.

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