JPH05227200A - Private communication equipment - Google Patents

Abstract

PURPOSE:To select and allocate the specific channel of broadcasting private video transmission network by establishing the video path on the broadcasting private video transmission network with the main unit through the selected idle channel on a node control section. CONSTITUTION:A main unit control section 11 contains a means sending and receiving a call control signal through a line exchange private communication network 30 for the video use request from a receiver 44 and the reception terminal connection request and from a video transmitter 41 and selecting the idle channel of a broadcasting private video transmission network 31 to establish the video path with the corresponding node 20. A node control section 21 contains a means sending and receiving a call control signal through the communication network 30 for the video use request of the self node and the reception terminal equipment connection request from the video transmitter 41 and establishing the video path with a main unit 10 on the transmission network 31 via the selected idle channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video selection device for a local communication device composed of a circuit-switched local communication network and a broadcast local video transmission network.

[0002]

2. Description of the Related Art PBX is a typical example of a premises communication network.
(Private branch exchange) and LAN (Local Area Network). The LAN is being standardized by the IEEE (American Institute of Electrical and Electronics Engineers) 802 committee, and there are types such as CSMA / CD, token bus, and token ring depending on the medium access method. These are packet-switched private communication networks that transmit data signals in a packet format in which the address of the destination node is added. These LANs are mainly intended for data transmission between computers distributed and arranged for office buildings, factories, research laboratories, schools and the like. For voice communication, it is possible to use a circuit-switched PBX together.

On the other hand, in an optical LAN using an optical fiber,
There is a TDMA method in which a high-speed transmission line on a ring is shared by time division multiplexing and necessary time slots are allocated between nodes. In this system, once a communication path is set up between nodes, the subsequent time slots are line-type private communication networks occupied by both nodes, and not only computer data but also voice transmission is possible. These are formed as a premises communication network for the purpose of data or voice transmission, and are not configured to be combined with a broadcast premises video transmission network for video transmission.

Conventionally, there have been the following two types of internal communication devices.

That is, as a first method, in a premises system mainly intended for ordinary houses or collective housing, a system provided by combining a television communication transmission line with a voice communication line, that is, a circuit-switched premises communication network. And a broadcast-type premises video transmission network. First, as a communication system in a general house, there is a Home Bus System (HBS) standardized by the Japan Electronic Machinery Manufacturers Association and the Radio Technology Association (Japan Electronic Machinery Manufacturers Association: ET-2101 Home Bus System, September 1988). Month). The HBS is a standardized residential communication system in which a pair wire and a coaxial cable are wired in each room in a house and information can be accessed from any place in the house. On the pair line, voice and data communication is performed as a telephone call with an outside line or an extension telephone. On the other hand, broadcasting information such as television and radio is transmitted from the co-listening antenna on the coaxial cable.

[0006] Further, there is a super home bus proposed by Matsushita Electric Co., Ltd. as a target for collective housing (Moromi et al., Condominium AV information system, pp. 11).
6-123, National Technical
Report Vol. 36, No. 6, 1990 1
February). This is a general TV broadcast (FM broadcast, VHF band, U) separately from the telephone wiring on the coaxial line for co-listening in the apartment.
In addition to the (HF band), the extension voice information between the common entrance, the dwelling unit, and the manager's room, and the common entrance video are transmitted. When transmitting analog video at the common entrance in the apartment house with a certain quality at a distance between the common entrance and the dwelling unit, it is difficult to use a pair of wires for communication such as a telephone, and broadcast type video transmission is not possible. Uses a coaxial line for. The extension audio information is F in the frequency band not used by FM broadcasting, VHF band, and UHF band.
The image at the common entrance is frequency-modulated and transmitted on an empty channel in the UHF band. When calling a dwelling unit from the common entrance, the bell of the home telephone of the corresponding dwelling unit rings to inform the presence of the visitor and display the image of the visitor on the TV monitor. Since the image is transmitted using a specific UHF channel, it is possible to display the image of the visitor by adjusting the channel selector of a normal television monitor to the specific channel.

[0007] Another example of multiplexing and transmitting the image of the common hall on a coaxial line for co-listening is the "Home PBX" system of the product name of Fujitsu General Ltd. Converted to channel and transmitted. In these systems, a circuit-switched private network and a broadcast-based private video transmission network are combined, and a specific channel of the broadcast-based private network is made to function as if it were part of the circuit-switched private network. , We are trying to improve convenience. The characteristics of the indoor system that combines the circuit-switched local communication network with the broadcast local video transmission network are that the entire system is provided by transmitting information that is difficult to transmit with the local communication network using a part of the broadcast local video transmission network. As a result, it is to improve convenience.

[0008] As a second method, Matsushita Communication Industrial Co., Ltd. provides a pair of wires for extension communication and a dedicated coaxial cable for transmitting intercom video of a common entrance in an apartment house, thereby We have proposed an apartment house system that transmits the extension communication and intercom video of the company (Inoue et al., Apartment house information management system, pp.124-130, Na
Tialal Technical Report, V
ol. 36, No. 61990), the coaxial cable used here is a coaxial cable for co-listening, that is, the wiring is separate from the broadcast transmission network, which is a big difference from the above system.

[0009]

However, in such a conventional local area communication device, in the case of the second method, a circuit area type private area communication network using a pair line, a broadcasting type private area for transmitting a co-listening television broadcast. In addition to the transmission network, a coaxial cable for transmitting the image of the common intercom door phone must be wired, which increases the amount of work and reduces the piping space.

The first method (super home bus,
In the home PBX), the image of the common entrance is transmitted using an empty channel in the UHF band on the broadcast type local area video transmission network, but the channel for transmitting the common entrance image is fixedly allocated. , Since each channel on the broadcast type video transmission network is transparently transmitted to each dwelling unit, by adjusting the channel selector of the TV monitor to this channel in any dwelling unit other than the visiting dwelling unit of the visitor There was a problem that it was possible to display the person's image.

That is, in the above system, a pseudo video communication function is realized in a broadcast type private network which is combined with a circuit switched private network, but there is a problem that video cannot be selectively received. It was

The present invention solves the above problems,
An object of the present invention is to provide a local communication device capable of individually selecting and allocating a specific channel of a broadcast type local video transmission network according to a user's request.

[0013]

SUMMARY OF THE INVENTION The present invention comprises a main device connected to a transmitting terminal device including one or more video transmitting devices,
One or more nodes connected to a receiving terminal device including a receiving device, a circuit-switched private network for connecting the main device and the nodes, and a broadcasting-type campus for transmitting one or more video channels in a broadcast format A video transmission network, and the main unit and the node each include a control unit for controlling transmission / reception of a call control signal on the circuit-switched private communication network and establishing a communication path on the circuit-switched private communication network. In the local communication device, the control unit of the main device responds to a video use request from the receiving terminal device and a receiving terminal device connection request from the transmitting terminal device via a call control signal via the circuit switching private network. And means for controlling the transmission / reception of the broadcast type local video transmission network to select a free channel in the broadcast local video transmission network to establish a video path on the broadcast local video transmission network with the corresponding node. The control unit transmits / receives a call control signal through the circuit switched private network in response to the video utilization request of the own node and the reception terminal device connection request from the transmission terminal device, and transmits the call control signal via the selected empty channel. And a means for establishing a video path on the broadcast type local video transmission network with the main device.

Further, according to the present invention, the control unit of the main device is
Channel status management means for storing and managing the video channel usage status of the broadcast type private video transmission network in a channel management table, and a main unit call control signal for controlling transmission / reception of call control signals on the circuit switched private communication network Including control means,
The main device call control signal control means includes means for receiving a video use request call setup message from one of the receiving terminal devices via the node, and the main device control unit is configured to receive the video use request call. Control for transmitting a device utilization request signal to a destination transmission terminal device based on a setting message and receiving a connection confirmation signal for confirming that the destination transmission terminal device is available for this device utilization request signal. And a main device video channel control means including means for performing and control for receiving a connection request signal requesting a connection from one of the transmitting terminal devices to a receiving terminal device connected to a destination node, The device call control signal control means includes means for outputting a search request based on the connection confirmation signal and the connection request signal, respectively. The main device call control signal control means includes means for retrieving the channel management table based on a request, and updating the channel state table by associating and updating the node number of a node corresponding to an empty channel. Means for controlling transmission of a call setup message for the broadcast type local video transmission network that specifies the channel number of the channel to which the node number is associated; and for the call setting message for the broadcast type local video transmission network from the corresponding node The main device video channel control means transmits a video connection completion signal to a corresponding transmission terminal device based on the response message, and a video from the corresponding transmission terminal device. The signal is received and transmitted through the channel of the above specified channel number of the above broadcasting type local video transmission network. Main node video channel control means for transmitting, and the control part of the node includes node call control signal control means for controlling transmission / reception of call control signals on the circuit-switched private network, and the node call control signal control means Is a means for transmitting a call setting message of a video use request of the own node, and when the call setting message sent from the main device to the own node is received, the received call setting message is broadcast-type indoor video transmission. If it is for a network, it includes means for transmitting a response message to this call setup message to the main device, and the control unit of the node receives the call setup message for the broadcast local video transmission network. Node video channel control for reading out the specified channel number and selecting and receiving the channel of the specified channel number of the broadcasting local video transmission network Means can be included.

Further, in the present invention, the main unit call control signal control means outputs a response signal for the circuit switched private network to the corresponding node based on the connection confirmation signal to output the response signal for the circuit switched private network. The main unit and the control unit of the node include means for establishing a communication path in the communication network, and after establishing the video path on the broadcast type local video transmission network based on the connection request signal from the transmission terminal, Means may be included for establishing a communication path on the circuit switched private network.

According to the present invention, the main unit has a main unit premises communication network interface for connecting to the circuit switching type private telecommunications network under the control of the control unit of the main unit, and the main unit controller. A video transmission interface for connecting to the transmission terminal device under the control of the above, and the broadcast type local video transmission network based on the control of the control unit of the main device by inputting the output and the co-listening video of the video transmission device interface. Including the main device video transmission interface for connection of
Each of the nodes has a node private network interface for connecting to the circuit switched private network under the control of the control unit of the node, and a broadcast private video transmission network under the control of the controller of the node. And a receiving device interface connected to the node image transmission interface and connected to the receiving terminal device under the control of the control unit of the node.

[0017]

The control unit of the main unit controls transmission / reception of the call control signal through the circuit switched private network in response to the video use request from the receiving terminal device and the receiving device connection request from the transmitting terminal device. An empty channel of the video transmission network is selected to establish a video path on the broadcast type local video transmission network with the corresponding node. The control unit of the node transmits / receives a call control signal via the circuit-switched private network in response to the video utilization request of the own node and the connection request of the receiving device from the transmitting terminal device, and the main control unit transmits the call control signal via the idle channel selected above Establishes a video path on the broadcast type local video transmission network with the device.

As described above, it is possible to individually select and assign a specific channel of the broadcast type local video transmission network according to the user's request.

[0019]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a local area communication device according to an embodiment of the present invention.

In FIG. 1, a local communication device is a main device 10 connected to a transmission terminal device including one or more video transmission devices 41A and 41B, and reception devices 44A and 44B to 44.
One or more nodes 2 connected to the receiving terminal device including C
0A, 20B to 20C, main device 10 and node 20A to
The main device 10 and the node 20 are provided with a circuit-switched private network 30 for connecting to the 20C and a broadcast private video transmission network 31 for transmitting one or more video channels in a broadcast format.
Each of A to 20C is a main device control unit 11 and a node control unit 21 as control units for controlling transmission / reception of a call control signal on the circuit-switched private communication network 30 and establishing a communication path on the circuit-switched private communication network 30. Including.

The main feature of the present invention is that the main device control section 11 responds to the video utilization request from the receiving device 44 and the receiving terminal device connection request from the video transmitting device 41. Means for controlling transmission / reception of a call control signal via 30 to select an empty channel of the broadcast type local video transmission network 31 to establish a video path on the broadcast type local video transmission network 31 with the corresponding node 20. The node control unit 21 uses the video use request of the own node and the video transmission device 4
A call control signal is transmitted / received through the circuit-switched private network 30 in response to a request for connection to the receiving terminal device from the communication terminal 1, and the broadcast-type private video transmission network 31 with the main device 10 is transmitted through the selected empty channel. Is to include means for establishing a video path of.

The main device control section 11 also stores a channel state management means 13 for storing and managing the state of use of the video channel of the broadcast type local video transmission network 31 in the channel management table.
And a main device call control signal control means 12 for controlling transmission / reception of a call control signal on the circuit-switched private network 30. The main device call control signal control means 12 includes one of the receiving devices 44 and its node. The main device control unit 11 transmits a device use request signal to the destination video transmitting device 41 based on the video use request call setting message through means 20 for receiving the image use request call setting message via 20. Means for receiving a connection confirmation signal for confirming that it is available for the device use request signal from the image transmitting device 41, and one of the image transmitting devices 41 to the destination node 20.
The main unit video channel control unit 15 including the unit for controlling the reception of the connection request signal for requesting the connection to the receiving unit 44 connected to the main unit call control signal control unit 1.
2 includes means for outputting a search request based on the connection confirmation signal and the connection request signal, respectively, and the main device control unit 11 searches the channel management table based on the search request to determine whether a node corresponding to an empty channel exists. Channel state rewriting means 14 for correlating and updating node numbers
In addition, the main device call control signal control means 12 controls the transmission of the call setting message of the broadcast type local video transmission network 30 in which the channel number of the channel in which the node number is associated with the corresponding node is designated. Means for controlling reception of a response message to the call setup message for the broadcast local video transmission network 31 from the corresponding node, and the main device video channel control means 15 corresponds to the response message based on the response message. A video connection completion signal is transmitted to the transmission terminal device 41, the video signal from the corresponding transmission terminal device 41 is received, and the broadcast type local video transmission network 3 is received.
1 includes a main unit video channel control means 15 for transmitting via the channel of the above designated channel number 1, and the node control unit 21 controls the transmission / reception of call control signals on the circuit switched private network 30. The node call control signal control means 22 includes a control signal control means 22. The node call control signal control means 22 receives a call setup message for sending a video use request of the own node and a call setup message sent from the main device 10 to the own node 20. When the received call setting message is for the broadcast type local video transmission network 31, the node control unit 21 includes means for transmitting a response message to the main apparatus 10 in response to the call setting message. The specified channel number is read from the received call setting message for the broadcast type local video transmission network 31, and the channel number of the broadcast type local video transmission network 31 is read. It includes nodes video channel control unit 23 for receiving the video signal from the video transmission apparatus 41 corresponding to select a channel of channel number.

Further, the main unit call control signal control means 12
Includes means for outputting a response signal for the circuit-switched private network 30 to the corresponding node 20 based on the connection confirmation signal to establish a communication path in the circuit-switched private communication network 30. The unit 11 and the node control unit 21 are means for establishing a video path on the broadcast type private video transmission network 31 based on a connection request signal from the video transmission device 41 and then establishing a communication path on the circuit switched type private communication network 30. including.

The main unit 10 also has a main unit premises communication network interface 16 for connecting to the circuit-switched type private premises communication network 30 under the control of the main unit control unit 11, and an image based on the control of the main unit control unit 11. The video transmission interface 19 for connecting to the transmission device 41, and the main device control unit 1 by inputting the output of the co-listening video and video transmission device interface 19
A main device video transmission interface 18 for connecting to the broadcast type local video transmission network 31 under the control of 0, and each node 20 is connected to the circuit switched local communication network 30 under the control of the node control unit 21. And a node video transmission interface 25 that connects to the broadcast local video transmission network 31 under the control of the node control unit 21 and a node video transmission interface 25 that is connected to the node video transmission interface 25. Receiver interface 2 for connecting to the receiver 44 under control
6 and.

The operation of the local communication device having such a configuration will be described. FIG. 2 is a flow chart showing an operation in which the main unit of the local communication device of the present invention permits the node to use the broadcast channel of the broadcast local video transmission network. FIG. 3 is a flow chart showing the operation when the node of the local area communication device of the present invention receives a call setup message addressed to itself. FIG. 4 is a diagram showing the contents of the channel management table of the local area communication device of the present invention. FIG. 5 is a sequence diagram showing a service for making a transmission request from the receiving device of the local communication device of the present invention to the video transmitting device. FIG. 6 is a sequence diagram showing a service in which the transmitter of the local area communication device of the present invention makes a transmission request to the receiver.

In FIG. 1, the number of nodes is 3, and the number of receiving devices is 3.
Although the number of transmitting devices is two, the number of transmitting devices is not limited to these numbers. A unique node number is assigned to each node. Further, here, the main device 10
Although the wiring form between the node 20 and the node 20 is shown in the bus form, it is not limited to the bus form, and various wiring forms such as a loop form and a star form are possible.

The main unit premises communication network interface 16 is
Interfacing with the circuit switched premises communication network 30,
Information signals such as voice and data and control signals such as call control signals are multiplexed. The public network interface 17 interfaces with the public network 40, and if the public network is ISDN, demultiplexes information signals such as voice and data and control signals such as call control signals. The video transmission device interface 19 transmits and receives control signals and information signals to and from the video transmission device 41. The main device video transmission interface 18 frequency-modulates the video transmitted from the video transmission device 41 via the video transmission device interface 19 to the channel designated by the main device video channel control means 15, and multiplexes it on the co-listening video 42. Broadcast type video transmission network 3
Transmit to 1.

The main device call control signal control means 12 controls the analysis and issuance of control signals transmitted / received to / from the circuit-switched private network 30 or public network 40 or the video transmission device 41. Is. The channel status management means 13 manages the usage status of the video channels on the broadcast type local video transmission network 31 as a channel management table. The channel state rewriting means 14 rewrites the channel management table by associating the channel number with the node number or the video transmission device number which is permitted to be used. The main device video channel control means 15 determines the video transmitter interface 19 according to the contents of the channel management table.
The frequency of the video transmitted from the video transmission device 41 via the channel is controlled to a designated channel.

Although the node 20 is shown here to have components such as the node controller 21 only in the node 20A, the same components are also present in the nodes 20B and 20C. The node premises communication network interface 24 interfaces with the circuit switched premises communication network 30 to demultiplex information signals such as voice and data and control signals such as call control means. The node video transmission interface 25 transparently transmits the co-listening video among the video transmitted via the broadcast type local video transmission network 31 to the reception device interface 26, and the video transmission device 41.
As for the video channels transmitted from, the only channels designated by the node video channel control means 23 are demodulated transparently or to baseband and transmitted to the receiver interface 26.

The receiving device interface 26 interfaces with the receiving device 44 and transmits / receives information signals such as voice and data to / from a communication terminal such as a telephone and demultiplexes them to receive a video image such as a television monitor or a VTR. Video signals and audio signals are transmitted to the device. The node call control signal control means 22 controls the analysis and issuance of a control signal transmitted / received to / from the circuit-switched private network 30 or the receiving device 44. The node video channel control means 23 instructs the receiving device interface 25 to display the video of the video channel designated by the main device 10 obtained by the node call control signal control means 22 by analyzing the call setup message transmitted from the main device 10. ..

In FIG. 2, first, the main unit 10 uses the video from the certain node by the main unit call control signal control means 12 in step S1 via the circuit-switched private network 30 and the main private network interface 16. When a call setting message requesting the request is received, the device call request signal is transmitted by the main device call control signal control means 12 to the video transmitting device 41 via the video transmitting device interface 19 in step S2. When the main device call control signal control means 12 receives a connection confirmation signal from the video transmission device 41 via the video transmission device interface 19 in step S3, or receives a connection request signal from the video transmission device 41 in step S4. At this time, in step S5, the channel state rewriting means 14 searches for an empty channel of the broadcast type local video transmission network 31 managed by the channel state management means 13.

The channel status management means 13 manages the status of each channel, the node number used, etc. in a channel management table as shown in FIG. If an empty channel exists in step S6 by the search, the channel state rewriting means 14 rewrites the channel management table in step S7. Specifically, the channel state of the selected empty channel is rewritten during use, and the node number permitted to be used and the number of the video transmission device to be used are written in the used node number column. If there is no free channel in step S6, a process of making the video unavailable is performed in step S19, for example, a process of notifying the use request terminal that there is no channel for video use and disconnecting the call. To do. In step S8, the main device call control signal control means 12 transmits a call setting message for the broadcast type private video transmission network 31 specifying this channel number to the corresponding node 20 via the circuit switched type private communication network 30. To do.

On the other hand, when the node call control signal control means 22 receives the call control message addressed to its own node number in step S9, the node 20 determines in step S10 that this call control message is a call setup message, and In step S11, the channel number included in this call setting message is read out, and in step S13, the node video channel control means 23 completes preparations for reception of this channel on the broadcast type local video transmission network 31, and reception by this channel. The transmitted information is transmitted to the receiving device 44 connected to this node. In step S14, the node call control signal control means 22
Sends a response message to the main device 10. If the call control message received in step S10 is not a call setup message, control is performed according to the contents of the message in step S17, and the call setup message received in step S11 is the broadcast type local video transmission network. Three
If it is not for 1, the normal call setting process as the circuit-switched private network 30 is performed in step S18.

When the main device call control signal control means 12 of the main device 10 receives the response message to the call setting message for the broadcast type local video transmission network 31 in step S15, the main device call control signal control is executed in step S16. The means 12 transmits a video connection completion signal to the video transmission device 41 via the video transmission device interface 19, and
The main device video transmission interface 18 is the video transmission device 4
The video signal transmitted from the main device video channel control means 1
The channel designated by 5 is frequency-modulated and multiplexed on the co-listening video 42 and transmitted on the broadcast-type local video transmission network 31.

Through the above flow, only the receiving device 44 connected to the node permitted to use by the main device 10 can receive the information transmitted on the channel permitted to use.

In FIG. 5, the receiving device 44 comprises a telephone and a television monitor, and the video transmitting device 41.
An example in which the audio information is transmitted using the circuit-switched private network 30 and the video information is transmitted using the broadcast private video transmission network 31 in the case where is composed of a surveillance camera and a microphone will be described. From the telephone of the receiving device 44 to the node 20
A call setup message is transmitted to the main device 10 via the. This call setting message includes transmitter designation information.
For example, the special number and the video transmitting device 41 are associated with each other, the special number dialed number is put in the called number information element, and the call setting message is transmitted. Upon receiving this call setting message, the main device 10 transmits a device utilization request signal to the designated video transmitting device 41. Applicable video transmission device 41
Sends back a connection confirmation signal to confirm that it is available. At this point, the video transmitter 41 to the main unit 1
Audio and video can be transmitted to 0. In response to this connection confirmation signal, the main device 10 transmits a response message as the circuit-switched private network 30 to the telephone of the corresponding receiving device 44 via the node 20, and the communication path is established between the telephone and the transmitting device. Established and voice transmission is possible.

Further, the main unit 10 selects an empty channel according to the flowcharts shown in FIGS. 2 and 3,
Broadcast type local video transmission network 31 for the corresponding node 20
The call setting message including the channel designation is sent to the corresponding node 20, and the corresponding node 20 prepares to receive the channel according to the call setting message and sends a response message to the main unit 10. The main device 10 transmits a video connection completion signal, and as a result, a video path using the broadcast type local video transmission network 31 is established between the video transmission device 41 and the television monitor of the reception device 44, and the video of the surveillance camera is displayed. Transmission becomes possible.

In FIG. 6, the receiving device 44 is composed of a telephone and a television monitor, and the video transmitting device 41.
In the case where is composed of a camera doorphone of a common entrance such as an apartment house, the audio information is transmitted through the circuit-switched premises communication network 30, and the video information is transmitted through the broadcast-type premises video transmission network 31. explain. First, the camera intercom of the video transmission device 41 makes a connection request to the reception device 44 connected to the specific node 20.

Upon receiving the connection request, the main unit 10 selects a vacant channel according to the flow charts shown in FIGS. 2 and 3 and corresponds to the call setting message including the channel designation of the broadcast type local video transmission network 31 to the corresponding node 20. To the corresponding node 20
0 prepares for channel reception in accordance with this call setup message and sends a response message to the main device 10. The main device 10 transmits a video connection completion signal to the video transmission device 41, whereby a video path using the broadcast type local video transmission network 31 is established, and the video transmission device 41.
Transmission to the camera monitor on the side becomes possible.

On the other hand, the main unit 10 transmits a call setting message for the circuit-switched private network 30 to the telephone set of the receiving unit 44 connected to the corresponding node 20. The telephone of the corresponding receiving device 44 rings the call bell and
The call message is returned to the main device 10. The user on the receiving device 44 side confirms the camera image from the image transmitting device 41 received on the television monitor and responds by off-hook operation or the like. A response message is transmitted to the main device 10, and the main device 10 sends a communication connection completion signal to the video transmission device 4
1 to establish a communication path using the circuit-switched private network 30 and enable a voice call between the intercom on the video transmission device 41 side and the telephone on the reception device 44 side. .. In this sequence, the user on the receiving device side can determine whether or not to answer the voice call after confirming the other party image. Therefore, by not performing the response operation, the receiving device 44 for the visitor who wants to refuse the conversation. It is also possible for the user on the side to use the absence.

As described above, according to the present embodiment, each node does not receive a specific channel of the normal broadcast type local video transmission network,
Only the node permitted to use this channel by the call control signal on the circuit switched private network from the main unit can receive this channel. Therefore, it is possible to individually select and allocate a specific channel on the broadcast type local video transmission network according to the user's request.

For example, a conventional set as a local device comprising a circuit-switched private network for communication such as telephone and a broadcast private video transmission network for transmitting co-listening video such as VHF and UHF. Assuming a housing system, it is conceivable to transmit visitor images at the common entrance using a broadcast-type in-house image transmission network. Visitor video is U
It is transmitted using a specific vacant channel in the HF band, but normally, because the node corresponding to each dwelling unit cannot receive this channel, a normal dwelling unit cannot see a visitor image. When a visitor calls a visited dwelling unit, the main device establishes a voice call to the node of this dwelling unit, and at the same time, a call for permitting the node of this dwelling unit to receive a channel for transmitting a visitor image. By transmitting the control signal, this dwelling unit receives this channel, and only the television monitor in this dwelling unit can display the visitor image.
In addition, a video storage device is connected to the main device to store video mail for each dwelling unit, visitor images when the dwelling unit is absent, and videophone images from outside lines on behalf of users. Thus, the stored image such as a video mail can be selectively transmitted to the image receiving device of this dwelling unit.

[0043]

As described above, the present invention has an excellent effect that a specific channel of a broadcast type local video transmission network can be individually selected and assigned according to a user's request.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a local area communication device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation in which the main unit of the local area communication device of the present invention permits the node to use the broadcast type channel of the broadcast type local video transmission network.

FIG. 3 is a diagram showing an operation when a node of the local area communication device of the present invention receives a call setup message.

FIG. 4 is a diagram showing the contents of a channel management table of the local area communication device of the present invention.

FIG. 5 is a sequence diagram showing a service for making a transmission request from a receiving device of a local area communication device of the present invention to a transmitting device.

FIG. 6 is a sequence diagram showing a service for making a transmission request from a transmission device of a local area communication device of the present invention to a reception device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 main device 11 main device control unit 12 main device call control signal control means 13 channel state management means 14 channel state rewriting means 15 main device video channel control means 16 main device internal communication network interface 17 public network interface 18 main device video transmission interface 19 video transmitter interface 20A to 20C node 21 node controller 22 node call control signal controller 23 node video channel controller 24 node private network interface 25 node video transmission interface 26 receiver interface 30 circuit switched private network 31 broadcasting On-premise video transmission network 40 Public networks 41A and 41B Video transmission device 42 Co-listening video 44A to 44C reception device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location H04Q 11/04

Claims (4)

[Claims] 1. A main device connected to a transmitting terminal device including one or more video transmitting devices, one or more nodes connected to a receiving terminal device including a receiving device, the main device and the node. And a broadcast type local video transmission network for transmitting one or more video channels in a broadcast format, wherein the main device and the node control call on the circuit switched local communication network. In a local communication device, each of which includes a control unit for controlling signal transmission / reception and for establishing a communication path on this circuit-switched private communication network, wherein the control unit of the main device is a video use request from the receiving terminal device and the transmission. In response to a terminal connection request from a terminal device, transmission / reception control of a call control signal is performed through the circuit-switched private network, and an empty channel of the broadcast-based private video transmission network is selected to select the corresponding node. Means for establishing a video path on the broadcast type local video transmission network with the terminal, the control unit of the node responds to the video utilization request of the own node and the reception terminal device connection request from the transmission terminal device. A means for transmitting and receiving a call control signal through the circuit switched private network and establishing a video path on the broadcast private video transmission network with the main device through the selected empty channel. Local communication device. 2. The control unit of the main unit stores channel state management means for storing and managing a video channel usage state of the broadcast type local video transmission network in a channel management table, and on the circuit switched type local communication network. A main device call control signal control means for controlling transmission / reception of a call control signal, wherein the main device call control signal control means transmits a call setting message of a video use request from one of the receiving terminal devices via the node. Including a means for receiving, the control unit of the main device transmits a device utilization request signal to a destination transmission terminal device based on the call setting message of the video utilization request, and transmits the device utilization request signal from the destination transmission terminal device. Means for performing control for receiving a connection confirmation signal for confirming availability to the receiving terminal device connected to the destination node from one of the transmitting terminal devices. A main device video channel control means including a control means for receiving a connection request signal for requesting a connection, wherein the main device call control signal control means makes a search request based on the connection confirmation signal and the connection request signal. The control unit of the main device includes a channel state rewriting unit that searches the channel management table based on the search request and associates and updates a node number of a node corresponding to an empty channel. The main device call control signal control means, means for performing control for transmitting a call setting message of a broadcast type local video transmission network in which a channel number of a channel in which the node number is associated with the corresponding node is designated, Control to receive a response message to the call setup message of the broadcast type local video transmission network from the corresponding node The main device video channel control means transmits a video connection completion signal to the corresponding transmission terminal device based on the response message, receives the video signal from the corresponding transmission terminal device, and transmits the broadcast type signal. Main unit video channel control means for transmitting via the channel of the designated channel number of the private video transmission network, the control unit of the node controls transmission and reception of call control signals on the circuit switched private communication network. A node call control signal control means, wherein the node call control signal control means receives a call setup message sent from the main device to the own node and a means for sending a call setup message of a video use request of the own node. If the received call setup message is for a broadcast-type local video transmission network, the main device receives a response message to the call setup message. The control unit of the node reads out the designated channel number from the received call setup message for the broadcast-type private video transmission network, and the control unit of the broadcast-type private video transmission network. 2. The local communication device according to claim 1, further comprising node video channel control means for selecting and receiving a channel having a designated channel number. 3. The main unit call control signal control means outputs a response signal for the circuit-switched private network to the corresponding node on the basis of the connection confirmation signal and outputs the response signal for the circuit-switched private network. The main unit and the control unit of the node include means for establishing a communication path, and the circuit switching type communication unit establishes a video path on the broadcast type local video transmission network based on a connection request signal from the transmission terminal. 3. The private communication device according to claim 2, further comprising means for establishing a communication path on the private communication network. 4. The main unit is based on a main unit premises communication network interface for connecting to the circuit-switched premises communication network under the control of a control unit of the main unit, and a control unit of the main unit. A video transmission interface for connecting to the transmission terminal device and an output of the video transmission device interface and a co-listening video are input to connect to the broadcast type local video transmission network under the control of the control unit of the main device. A main device video transmission interface, wherein each of the nodes controls a node private network interface that connects to the circuit switched private communication network based on the control of the controller of the node and a controller of the node. Based on the node video transmission interface for connecting to the broadcast type local video transmission network based on the above, and the node connected to the node video transmission interface Premises communication apparatus according to claim 1 comprising a receiving device interface for connection between the receiving terminal apparatus under the control of the control unit.