JP6811437B2 - TV doorphone device - Google Patents

Description

The present invention relates to a television doorphone device.

Awareness of crime prevention is increasing year by year, and in recent years, there has been an increasing demand for low-cost, easy-to-install entrance slave units, etc. not only in detached houses but also in single-person households such as studio condominiums.

In order to meet the demand for easy installation at such a low cost, a device that eliminates the need for wiring work between the entrance slave unit and the wireless master unit by wireless communication has begun to spread. For example, Patent Document 1 discloses a television doorphone device that performs wireless communication between an entrance slave unit and a wireless master unit using Bluetooth (registered trademark) or the like.

JP-A-2007-142808

However, although the TV door phone device disclosed in Patent Document 1 described above is capable of 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 (walls, pillars, etc. of the house) with the wireless master unit, radio waves may be attenuated, making communication difficult or increasing power consumption.

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

TV door device according to one aspect of the present invention, a handset, a TV door apparatus for performing DECT radio communication using time division multiple access communication system between a master unit, the master unit, the child By transmitting an image call connection response or an image call connection refusal response to the slave unit in response to an image call connection request from the machine, the number of image call connections is controlled to make the image data transmission speed variable. When the image call connection response is transmitted to the slave unit for all of the image call connection requests , the image data is received from the slave unit with the first image quality and displayed, and the image call connection request is made. When the image call connection refusal response is transmitted to the slave unit for a part and the image call connection response is transmitted to the slave unit for the rest of the image call connection request, the slave unit sends the image call connection refusal response to the slave unit. A configuration is adopted in which image data is received and displayed with a second image quality lower than that of the first image quality.

According to the present invention, wireless communication between the entrance slave unit and the wireless master unit can be stably performed, and power consumption can be reduced.

The figure which shows the television doorphone apparatus which concerns on Embodiment 1 of this invention. Block diagram showing a configuration example of the entrance slave unit according to the first embodiment of the present invention. Block diagram showing a configuration example of the indoor master unit according to the first embodiment of the present invention. A sequence diagram showing a procedure for connecting the entrance slave unit and the indoor master unit by pressing the call button of the entrance slave unit according to the first embodiment of the present invention. A sequence diagram showing another procedure for connecting the entrance slave unit and the indoor master unit by pressing the call button of the entrance slave unit according to the first embodiment of the present invention. A sequence diagram showing a procedure for connecting the entrance slave unit and the indoor master unit by pressing the monitor button of the indoor master unit according to the first embodiment of the present invention. A sequence diagram showing another procedure for connecting the entrance slave unit and the indoor master unit by pressing the monitor button of the indoor master unit according to the first embodiment of the present invention. The figure which shows the allocation example of the slot in 1 frame The figure which shows the other allocation example of the slot in one frame. A sequence diagram showing a procedure for connecting the entrance slave unit and the indoor master unit by pressing the call button of the entrance slave unit according to the second embodiment of the present invention. A sequence diagram showing another procedure for connecting the entrance slave unit and the indoor master unit by pressing the call button of the entrance slave unit according to the second embodiment of the present invention. A sequence diagram showing a procedure for connecting the entrance slave unit and the indoor master unit by pressing the monitor button of the indoor master unit according to the second embodiment of the present invention. A sequence diagram showing another procedure for connecting the entrance slave unit and the indoor master unit by pressing the monitor button of the indoor master unit according to the second embodiment of the present invention. Control flow diagram of the indoor master unit of the second embodiment 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 doorphone device 10 according to a first embodiment of the present invention. As shown in FIG. 1, the TV doorphone device 10 includes an entrance slave unit 100 and an indoor master unit 200. The entrance slave unit 100 is provided outdoors, for example, near the entrance door, and the indoor master unit 200 is provided indoors. A structure such as a wall of a house exists between the entrance slave unit 100 and the indoor master unit 200.

FIG. 2 is a block diagram showing a configuration example of the entrance slave unit 100 according to the first embodiment of the present invention.

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

The wireless communication unit 101 communicates with the indoor master unit 200 via a wireless line. The communication method by the wireless communication unit 101 is a time-division multiplexing communication method in which a frequency band of 1.9 GHz band such as 1880 MHz to 1930 MHz is used, such as DECT (Digital Enhanced Cordless Telecommunication). According to this communication method, it is possible to limit the communication time with the indoor master unit 200 by providing a sleep state to reduce power consumption, and to deliver radio waves to a relatively long distance due to the characteristics of the frequency band. In the following description, it is assumed that the DECT method is used as the communication method.

The wireless communication unit 101 transmits the data of the image (hereinafter, referred to as “captured image”) captured by the image pickup unit 105 to the indoor master unit 200 by the DECT method. As a result, the indoor resident can visually recognize the visitor existing near the entrance door. Further, 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 slave unit 100 to the indoor master unit 200 by the DECT method. Further, the wireless communication unit 101 receives voice information including the voice of the resident from the indoor master unit 200 by the DECT method. This allows an outdoor visitor to talk to an indoor resident.

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, the CPU realizes various functions of the control unit 102 by executing a program stored in the ROM.

The control unit 102 controls the entire entrance slave unit 100 and executes various controls, calculations, and determinations. The control unit 102 performs arithmetic processing for controlling each unit of the entrance slave unit 100.

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

The power supply unit 104 supplies electric power for operating the entrance slave unit 100 to each unit. The power supply unit 104 is composed of a battery such as a primary battery or a secondary battery in consideration of installability. However, the power supply unit 104 is not limited to this, and power may be input from the AC power supply or the AC adapter via the 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 the voice of a visitor, and transmits the voice information to the indoor master unit 200 via the wireless communication unit 101. Further, the voice input / output unit 106 outputs voice information including the voice of the resident transmitted from the indoor master unit 200.

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

The interrupt detection unit 108 detects key interrupts such as buttons provided in the entrance slave unit 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 the 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 in order to supply power to each unit based on the detection of a predetermined interrupt.

<Configuration of indoor master unit>
FIG. 3 is a block diagram showing a configuration example of the indoor master unit 200 according to the first embodiment of the present invention.

The indoor master unit 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, an audio input / output unit 207, a storage unit 208, a charge detection unit 209, and an interrupt detection. A unit 210 is provided.

The wireless communication unit 201 communicates with the entrance slave unit 100 via a wireless line. The communication method by the wireless communication unit 201 is a DECT method (a time division multiplexing communication method in which a frequency band of the 1.9 GHz band such as 1880 MHz to 1930 MHz is used). According to this communication method, it is possible to limit the communication time with the entrance slave unit 100 by providing a sleep state to reduce power consumption, and to deliver radio waves to a relatively long distance due to the characteristics of the frequency band. The wireless communication unit 201 transmits a reference control signal at a constant cycle.

The wireless communication unit 201 receives the image data transmitted from the entrance slave unit 100 by the DECT method. As a result, the indoor resident can visually recognize the visitor existing near the entrance door. In addition, the wireless communication unit 201 receives voice information including the voice of the visitor from the entrance slave unit 100 by the DECT method. Further, the wireless communication unit 201 transmits voice information including the voice of the resident collected by the voice input / output unit 207 of the indoor master unit 200 to the entrance slave unit 100 by the DECT method. This allows an outdoor visitor to talk to an indoor resident.

The control unit 202 has a ROM, a RAM, a CPU, and the like. For example, the CPU realizes various functions of the control unit 202 by executing a program stored in the ROM.

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

In particular, the control unit 202 confirms the radio wave condition using the image call connection request received from the entrance slave unit 100, and if the radio wave condition is good, transmits an image call connection response to the entrance slave unit 100 to transmit radio waves. When the situation is deteriorated, the number of image call connections is controlled by transmitting an image call connection refusal response to the entrance slave unit 100. As a result, the television doorphone device 10 can make the transmission speed of image data variable. In this embodiment, the number of slots and the number of channels used for communication may be increased or decreased, not limited to the number of connected image calls.

The operation unit 203 is various buttons, for example, a response button for responding when the presence of a visitor is notified from the entrance slave unit 100, a monitor button for acquiring image data from the entrance slave unit 100, and an entrance. It is a button or the like for controlling the slave unit 100.

The power supply unit 204 supplies electric power for operating the indoor master unit 200 to each unit. The power supply unit 204 may be input from an AC power source or an AC adapter, or may be composed of a battery such as a primary battery or a secondary battery in consideration of installability.

The RSSI level detection unit 205 detects the strength of the signal received from the entrance slave unit 100 by the wireless communication unit 201, that is, the RSSI (Received Signal Strength Indicator) level.

The display unit 206 has, 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, an image captured from the entrance slave unit 100, and an image for operating the indoor master unit 200.

The voice input / output unit 207 is a microphone, a speaker, or the like, collects voice information including the voice of the resident, and transmits the voice information to the entrance slave unit 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 slave unit 100.

The storage unit 208 is composed of a flash memory or the like, and includes various images, sounds, and other management information. The image includes, for example, a moving image and a still image, an image captured from the entrance slave unit 100, and an image for operating the indoor master unit 200. The voice includes, for example, the voice of a standard message emitted from the indoor master unit 200.

The other management information includes, for example, password information for preventing the various setting information of the indoor master unit 200 from being arbitrarily changed.

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

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

The interrupt detection unit 210 also includes an ultra-low power consumption mode that controls power supply to each unit by the power supply unit 204 in order to realize 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 in order to supply power to each unit based on the detection of a predetermined interrupt.

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

In step S401, the call button is pressed on the entrance slave unit 100, the entrance slave unit 100 searches for the reference control signal transmitted from the indoor master unit 200 and establishes communication synchronization, and in step S402, the entrance slave unit 100 causes the entrance slave unit 100. A voice call connection request is transmitted to the indoor master unit 200. In step S403, the indoor master unit 200 transmits a voice call connection response to the entrance slave unit 100. As a result, the indoor master unit 200 is notified of the visitor's visit.

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

Similarly, in steps S406 to S411, a connection request and a connection response for image calls 2 to 4 are transmitted and received between the entrance slave unit 100 and the indoor master unit 200.

Here, since there are four image calls and all of them are connected, the entrance slave unit 100 and the indoor master unit 200 can transmit and receive image data at the maximum transmission speed.

Further, FIG. 5 is a sequence diagram showing another procedure in which the call button of the entrance slave unit 100 is pressed to connect the entrance slave unit 100 and the indoor master unit 200. However, in FIG. 5, the parts common to FIG. 4 are designated by the same reference numerals as those in FIG. 4, and duplicate description will be omitted.

In step S408, the entrance slave unit 100 transmits an image call 3 connection request to the indoor master unit 200. At this time, if the radio wave condition is deteriorated due to radio wave interference or the like, in step S501, the indoor master unit 200 transmits an image call 3 connection refusal response to the entrance slave unit 100. As described above, in the television doorphone device 10, the number of image call connections is increased or decreased according to the radio wave condition, and the transmission speed of the image data is variable. The number of slots and the number of channels used for communication may be increased or decreased, not limited to the number of image call connections.

As a result, the entrance slave unit 100 and the indoor master unit 200 transmit and receive image data at a reduced transmission speed. After a certain period of time has elapsed since the entrance slave unit 100 received the image call 3 connection refusal response, the transmission speed is requested to be increased again. That is, in step S502, the entrance slave unit 100 transmits the image call 3 connection request to the indoor master unit 200. Again, in step S503, it is assumed that the indoor master unit 200 transmits the image call 3 connection refusal response to the entrance slave unit 100.

Further, FIG. 6 is a sequence diagram showing a procedure in which the monitor button of the indoor master unit 200 is pressed to connect the entrance slave unit 100 and the indoor master unit 200. However, in FIG. 6, the parts common to FIG. 4 are designated by the same reference numerals as those in FIG. 4, and duplicate description will be omitted. Although not explicitly shown in FIG. 6, the indoor master unit 200 periodically transmits a reference control signal. For example, when the entrance slave unit 100 is battery-powered, the entrance slave unit 100 may be in a sleep state in a normal state, and may be configured to periodically release the sleep state and receive a reference control signal. With this configuration, even when the entrance slave unit 100 is battery-powered, it is possible to perform a monitor operation from the indoor master unit 200 while reducing the power consumption of the entrance slave unit 100.

In step S601, the monitor button is pressed on the indoor master unit 200, and the entrance slave unit 100 searches for the reference control signal transmitted from the indoor master unit 200 to establish communication synchronization. In step S602, the indoor master unit 200 Sends a camera connection request to the entrance slave unit 100. In step S603, the entrance slave unit 100 transmits a camera connection response to the indoor master unit 200, and the procedures of steps S402 to S411 are executed.

Further, FIG. 7 is a sequence diagram showing another procedure in which the monitor button of the indoor master unit 200 is pressed to connect the entrance slave unit 100 and the indoor master unit 200. However, in FIG. 7, the parts common to FIG. 6 are designated by the same reference numerals as those in FIG. 6, and duplicate description will be omitted.

In step S408, the entrance slave unit 100 transmits an image call 3 connection request to the indoor master unit 200. At this time, if the radio wave condition is deteriorated due to radio wave interference or the like, in step S701, the indoor master unit 200 transmits an image call 3 connection refusal response to the entrance slave unit 100. As described above, in the television doorphone device 10, the number of image call connections is increased or decreased according to the radio wave condition, and the transmission speed of the image data is variable. The number of slots and the number of channels used for communication may be increased or decreased, not limited to the number of image call connections.

As a result, the entrance slave unit 100 and the indoor master unit 200 transmit and receive image data at a reduced transmission speed. After a certain period of time has elapsed since the entrance slave unit 100 received the image call 3 connection refusal response, the transmission speed is requested to be increased again. That is, in step S702, the entrance slave unit 100 transmits the image call 3 connection request to the indoor master unit 200. Again, in step S703, it is assumed that the indoor master unit 200 transmits the image call 3 connection refusal response to the entrance slave unit 100.

In the connection procedure shown in FIGS. 4 to 7, the image call is connected after the voice call is connected, but the image call is connected to notify the indoor master unit 200 of the visitor's visit. You may connect the voice call later.

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

Further, the slot S3 is assigned to transmit image data from the entrance slave unit 100, and the slot (pair slot) S15 paired with the slot S3 is also assigned to transmit 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 unit 100 can be suppressed, and the entrance slave unit 100 can be battery-powered. The television doorphone device 10 may include a mode for prolonging the sleep state, and in this case, the power consumption of the entrance slave unit 100 can be further suppressed. Further, the TV doorphone device 10 may include a mode in which the indoor master unit 200 responds only when the call button of the entrance slave unit 100 is pressed. In this case, the power consumption of the entrance slave unit 100 is further suppressed. be able to.

When the indoor master unit of the TV doorphone device 10 starts communication with the entrance slave unit, it confirms whether there is an empty slot and uses it for communication from the slots confirmed to be empty. Select a slot to notify the entrance slave unit and establish communication with the entrance slave unit.

When there are a plurality of entrance slave units, the indoor master unit of the TV doorphone device 10 allocates slot S1 to the first entrance slave unit, slots S2 to the second entrance slave unit, and slots Sn to the second entrance slave unit. It may be assigned to the entrance slave unit of. As a result, the indoor master unit 200 can communicate with a plurality of entrance slave units.

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

Further, as shown in FIG. 9, the television doorphone device 10 may allocate a plurality of pair slots to one entrance slave unit in voice communication or image communication. In FIG. 9, the slot S1 is assigned to transmit audio data from the entrance slave unit 100, and the slot (pair slot) S13 paired with the slot S1 is assigned to transmit audio data from the indoor master unit 200. Further, the slot S2 is assigned to transmit voice data from the entrance slave unit 100, and the slot (additional pair slot) S14 paired with the slot S2 is assigned to transmit voice data from the indoor master unit 200.

Further, the slot S5 is assigned to transmit image data from the entrance slave unit 100, and the slot (pair slot) S17 paired with the slot S5 is also assigned to transmit image data from the entrance slave unit 100. Further, the slot S7 is assigned to transmit image data from the entrance slave unit 100, and the slot (additional pair slot) S19 paired with the slot S7 is also assigned to transmit image data from the entrance slave unit 100.

As described above, according to the present embodiment, by using the frequency band of the 1.9 GHz band and the time division multiplexing communication method such as the DECT method for the wireless communication between the entrance slave unit 100 and the indoor master unit 200, the entrance Even if the slave unit 100 and the indoor master unit 200 are far apart from each other, or if the structure between the entrance slave unit 100 and the indoor master unit 200 has a high radio wave shielding effect, the entrance slave unit 100 may be affected by the frequency characteristics. And wireless communication with the wireless master unit 200 can be stably performed, and the power consumption can be reduced by appropriately putting the device into a sleep state. When applied to the indoor propagation model based on ITU-R P.1238-6, the frequency band of 2.4 GHz band, which enables high-speed data communication, is used as the communication distance that enables stable communication. While it is about 30 m, it is about 80 m when the frequency band of the 1.9 GHz band is used. Therefore, in order to practically use a wireless TV door intercom 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 television doorphone, time division multiplexing communication capable of performing asymmetric communication using a plurality of slots for image communication having a large amount of data is preferable.

Another feature of wireless TV door intercoms is that they are battery-powered and easy to install. To realize battery drive, a communication method that enables system operation with low power consumption, that is, communication sections are time-division-multiplexed, power is supplied only to the sections that require power (ON operation), and the power supply is not available. Time-division multiplex communication that can operate in sleep is appropriate for the required section. It should be noted that, in the slave unit, in a system that is normally in a sleep state and operates only when an interrupt signal is generated, it is possible to use another communication method. However, in a system that performs image communication by wireless notification from the master unit to the slave unit, both the master unit and the slave unit need to be started periodically, and the slave unit needs to periodically monitor the notification from the master unit. It is preferable to use time-division multiplex communication capable of time management.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described. In the second embodiment, the configuration of the TV doorphone device, the configuration of the entrance slave unit, and the configuration of the indoor master unit are the same as those in the first embodiment, and thus the description thereof will be omitted. The indoor master unit 200 of the second embodiment is different from the indoor master unit 200 of 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 in the image data received from the entrance slave unit 100, and if a communication error occurs, a slot movement request or an image call is made. The number of image call connections is controlled by transmitting the disconnection request to the entrance slave unit 100. As a result, the television doorphone device 10 can change the image quality (frame rate, compression rate, image size) according to the radio wave condition.

<Connection procedure>
Next, the connection procedure for wirelessly connecting the entrance slave unit 100 and the indoor master unit 200 in the present embodiment will be described. FIG. 10 is a sequence diagram showing a procedure in which the call button of the entrance slave unit 100 is pressed to connect the entrance slave unit 100 and the indoor master unit 200. However, in FIG. 10, the parts common to FIG. 4 are designated by the same reference numerals as those in FIG.

In FIG. 10, steps S401 to S411 are common to 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 unit 100 and the indoor master unit 200. .. FIG. 10 shows a case where there are four image calls and all of them are connected.

After that, it is assumed that a communication error has occurred in the slot of the image call 2. In this case, the indoor master unit 200 confirms whether or not there is an empty slot to be moved to. FIG. 10 shows a case where there is a slot to move to (S801). In this case, in step S802, the indoor master unit 200 transmits an image call 2-slot movement request to the entrance slave unit 100, and in step S803, the entrance slave unit 100 transmits an image call 2-slot movement response to the indoor master unit 200. .. As a result, the communication slot is moved.

After that, after a certain period of time has elapsed since the entrance slave unit 100 transmits the image call 2 slot movement response, the image call 2 connection request is transmitted to the indoor master unit 200 again in step S804. In step S805, the indoor master unit 200 transmits an image call 2 connection response to the entrance slave unit 100. In this case, the entrance slave unit 100 and the indoor master unit 200 can continue transmitting and receiving image data at the maximum transmission speed.

Further, FIG. 11 is a sequence diagram showing another procedure in which the call button of the entrance slave unit 100 is pressed to connect the entrance slave unit 100 and the indoor master unit 200. However, in FIG. 11, the parts common to FIG. 10 are designated by the same reference numerals as those in FIG. 10, and duplicate description will be omitted.

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 master unit 200 confirms whether or not there is an empty slot to be moved to. FIG. 11 shows a case where there is no destination slot (S901). In this case, in step S902, the indoor master unit 200 transmits an image call 4 disconnection request to the entrance slave unit 100, and in step S903, the entrance slave unit 100 transmits an image call 4 disconnection response to the indoor master unit 200. As a result, the entrance slave unit 100 and the indoor master unit 200 transmit and receive image data at a reduced transmission speed.

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 speed is variable. The number of slots and the number of channels used for communication may be increased or decreased, not limited to the number of image call connections.

Further, FIG. 12 is a sequence diagram showing a procedure in which the monitor button of the indoor master unit 200 is pressed to connect the entrance slave unit 100 and the indoor master unit 200. However, in FIG. 12, the parts common to those in FIGS. 6 and 10 are designated by the same reference numerals as those in FIGS. 6 and 10, and duplicate description will be omitted.

In FIG. 12, steps S601 to S603 and S402 to S411 are common to FIG. 6, and a connection request and a connection response for voice calls and image calls 1 to 4 between the entrance slave unit 100 and the indoor master unit 200. Is sent and received. FIG. 12 shows a case where there are four image calls and all of them are connected.

Further, in FIG. 12, steps S801 to S805 are common to those in FIG. 10, and in this case, the entrance slave unit 100 and the indoor master unit 200 can continue transmitting and receiving image data at the maximum transmission speed.

Further, FIG. 13 is a sequence diagram showing another procedure showing a procedure in which the monitor button of the indoor master unit 200 is pressed to connect the entrance slave unit 100 and the indoor master unit 200. However, in FIG. 13, the parts common to those in FIGS. 6 and 11 are designated by the same reference numerals as those in FIGS. 6 and 11, and duplicate description will be omitted.

In FIG. 13, steps S601 to S603 and S402 to S411 are common to FIG. 6, and a connection request and a connection response for voice calls and image calls 1 to 4 between the entrance slave unit 100 and the indoor master unit 200. Is sent and received. FIG. 13 shows a case where there are four image calls and all of them are connected.

Further, in FIG. 13, steps S901 to S903 are common to those in FIG. 11, and in this case, the entrance slave unit 100 and the indoor master unit 200 transmit and receive image data at a degraded transmission speed.

In addition, in FIGS. 10 to 13, the same effect can be obtained even if the image connection is performed first and the voice connection is performed later. Further, in FIGS. 10 and 12, when a communication error occurs, the indoor master unit 200 transmits a slot movement request (S802), but instead transmits error information indicating the occurrence of a communication error, and the entrance slave unit 100 transmits the slot. A move request may be sent. Further, in FIGS. 10 and 12, the entrance slave unit 100 does not have to transmit the slot movement response (S803). Further, in FIGS. 11 and 13, the entrance slave unit 100 does not have to transmit the disconnection response (S902).

<Control flow of indoor master unit>
Next, the control flow of the indoor master unit 200 according to the present embodiment will be described with reference to FIG.

With the communication established with the entrance slave unit 100, the control unit 202 confirms whether or not a communication error has occurred in the image data received from the entrance slave unit 100. If no communication error has occurred (S1001: NO), the current state is maintained until the communication with the entrance slave unit 100 is completed (S1005: NO, the flow returns to S1001).

When a communication error occurs (S1001: YES), the control unit 202 confirms whether or not there is an empty slot to be moved to. When there is an empty slot (S1002: YES), the control unit 202 transmits a slot movement request to the entrance slave unit 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 the communication with the entrance slave unit 100 is completed (S1005: NO, the flow returns to S1001).

As described above, according to the present embodiment, the number of image call connections can be controlled according to the presence or absence of a communication error, so that the image quality (frame rate, compression rate, image) can be controlled according to the radio wave condition. Size) can be variable.

Examples of lowering the 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 movement of the image becomes slow. If the image compression rate is increased or the image size is reduced, the motion of the image is maintained, but the image quality deteriorates.

In the present embodiment, the entrance slave unit 100 searches for the reference control signal transmitted from the indoor master unit 200, establishes communication synchronization, establishes a voice call, and invites a visitor to the indoor master unit 200. Although it has been explained that the notification is given, the present invention is not limited to this. For example, when the call button is pressed on the entrance slave unit 100, the indoor master unit 200 is notified of the visitor's visit as a response to the reference control signal transmitted from the indoor master unit 200, and a voice call and an image call are sequentially established. You may.

Further, in the present embodiment, as the frequency band used by the television doorphone device 10, a frequency band that is unlikely to be used in another system may be selected from the plurality of frequency bands.

Further, in the present embodiment, it has been explained that the power supply of the indoor master unit 200 may be input from an AC power supply or an AC adapter, or may be composed of a battery. When the power source of the indoor master unit 200 is composed of batteries, the indoor master unit 200 may perform an intermittent operation only when the connection of the indoor master unit 200 with the external power supply of the charging stand is cut off. As a result, the power consumption of the indoor master unit 200 can be reduced.

Further, when the indoor master unit 200 is disconnected from the external power supply of the charging stand, the entrance slave unit 100 may be set to periodically go to sleep. As a result, when the communication synchronization between the entrance slave unit 100 and the indoor master unit 200 is lost, it becomes easy to recover and the system can be stabilized.

Further, when the power source of the indoor master unit 200 is composed of batteries, the indoor master unit 200 notifies the entrance slave unit 100 that it operates in the ultra-low power consumption mode compliant with DECT, and the ultra-low power consumption mode. Move to.

INDUSTRIAL APPLICABILITY The present invention is useful for stably performing wireless communication between the entrance slave unit and the wireless master unit and reducing power consumption.

10 TV doorphone device 100 Entrance slave unit 101, 201 Wireless communication unit 102, 202 Control unit 103, 203 Operation unit 104, 204 Power supply unit 105 Imaging unit 106, 207 Audio input / output unit 107, 208 Storage unit 108, 210 Interrupt detection unit 200 Indoor master unit 205 RSSI level detection unit 206 Display unit 209 Charge detection unit

Claims (4)

A TV door intercom device that performs DECT wireless communication between a slave unit and a master unit using a time division multiplexing communication method.
The master unit is
By transmitting an image call connection response or an image call connection refusal response to the slave unit in response to the image call connection request from the slave unit, the number of image call connections is controlled and the transmission speed of image data is made variable. ,
When the image call connection response is transmitted to the slave unit for all of the image call connection requests , the image data is received from the slave unit with the first image quality and displayed, and the image call connection request is made. When the image call connection refusal response is transmitted to the slave unit for a part of the image call connection request and the image call connection response is transmitted to the slave unit for the rest of the image call connection request, the slave unit The image data is received and displayed with a second image quality lower than that of the first image quality.
TV doorphone device. A TV door intercom device that performs DECT wireless communication between a slave unit and a master unit using a time division multiplexing communication method.
The master unit is
If a communication error occurs in the data received from the slave unit and there is an empty slot, a slot movement request is sent to the slave unit.
When a communication error occurs in the data received from the slave unit and there is no empty slot, a disconnection request for the image call in which the communication error has occurred is sent to the slave unit to control the number of image call connections. To change the image quality of the data,
TV doorphone device. A TV door intercom device that performs DECT wireless communication between a slave unit and a master unit using a time division multiplexing communication method.
The master unit is
A predetermined number of slots for transmitting audio data and slots for transmitting image data are allocated 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 for transmitting the image data is reduced.
TV doorphone device. The slave unit
It is battery-powered, periodically wakes up and receives control signals from the master unit.
The TV doorphone device according to any one of claims 1 to 3 .

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