JPH0974451A - Video telephone terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid trouble of placing a video telephone terminal and a telephone set on a desk of each person by connecting an analog channel and a digital channel to a telephone set of each person via a multi-person common use video telephone set so as to conduct voice communication. SOLUTION: Extensions 9, 10 and other extension 11 are connected to a multi-person common use video telephone set 1 via a private branch exchange 45 for an ISDN channel 12 and an analog channel 46. Furthermore, an external camera monitor 3 arranged between the telephone sets 6, 7 is connected to the multi-person common use video telephone set 1 via a video input output line 42. In the case of video telephone communication, an image is communicated via the external camera monitor 3 and the voice signal is communicated via the telephone set 6 or 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV phone terminal device, and more particularly to a TV phone terminal device using an ISDN line.

[0002]

2. Description of the Related Art Conventionally, a video telephone system using an ISDN line and an analog line is known.

FIG. 6 is a diagram showing an example of a system for introducing a conventional TV telephone into an office or the like. An analog line 209 and an ISDN line 200 are installed as external lines in the office. A private branch exchange 203 is installed in the office for exchanging the extension in the office and the analog line 209, and the private branch exchange 203 is connected to the extension 206, the extension 207, and another extension 208 as analog extensions. . The extension 206 is the telephone 20 on the office desk 210.
The telephone 205 on the office desk 211 is connected to the extension 207. Individual office desk 210
And 211 from the private branch exchange to extensions 206 and 207.
Besides, ISDN line 200 is laid and ISDN
A TV phone 201 on the office desk 210 and a TV phone 202 on the office desk 211 are connected to the line 200. Therefore, the office desk 210 has a telephone 204 and a video telephone 201.
And a telephone 205 and a videophone 202 are installed on the office desk 211.

As described above, when a desk-top TV telephone is installed in each office desk of an office, two communication devices are installed in each office desk. If it is economically difficult to install a TV phone terminal at each office desk, one office may be installed in a corner of the office or a TV phone conference room. .

[0005]

When a desk-top type TV telephone is introduced to each desk in an office, it is necessary to lay a digital line on each desk or prepare a digital PBX. Furthermore, when the analog extension telephone set up to now has been introduced, both the TV telephone and the analog telephone will be installed on the office desk, and the communication desk will occupy the desk of the office desk, which will be complicated.

If only one TV phone is installed as an office, the operator can use it only in a special place, and the TV phone can be easily installed at each office desk like an existing analog phone. It cannot be used and is inconvenient.

The present invention has been made to solve the above problems, and eliminates the complexity of introducing a TV telephone into an office or the like in which analog lines and digital lines are mixed. It is an object of the present invention to provide a videophone terminal device capable of performing the above.

[0008]

According to the present invention, the above-mentioned problem is a TV telephone terminal device for communicating a video signal and an audio signal via an ISDN line, which has at least two analog extensions and at least two analog extensions. Subscriber circuit means connected to one analog extension telephone and connecting an analog extension connected to an analog extension to one of the analog extension telephones, and separating / multiplexing the voice signal and the image signal of the ISDN line. Means for communicating a video signal through a video codec, a monitor and a camera during videophone communication,
Means for controlling a voice signal to communicate via one of the analog telephones which is not connected to the analog extension.

According to the present invention, the above-mentioned problems are separated in the direction variable pan head for mounting the monitor and the camera, the means for detecting the direction of the pan head, and the video telephone communication. 3. The video telephone terminal device according to claim 2, further comprising: a unit that controls the direction of the pan head unit according to the direction of an analog extension telephone that communicates a voice signal.

When a call connection request is made by dialing in from the analog line to the telephone, the private branch exchange sends a ringing signal to the extension. The ringing signal on the extension is transparently transmitted to the telephone on the local line through the multi-person videophone. When the telephone receives the ringing signal, the ringing tone is activated to inform the operator that a call connection request has been made. When the telephone goes off-hook, the analog line and the telephone are connected.

When an analog line and one extension telephone are connected to each other and a connection request is made from the ISDN line by a TV telephone communication, the multi-person shared type TV telephone terminal device
A call signal is sent to another local line to excite the connected extension telephone, and a video signal indicating that a videophone call is made to the video input / output line is sent, and the external camera Display on the monitor. Here, when the called extension telephone is hooked off-hook, the telephone communicates with the TV telephone and the image of the TV telephone is displayed on the external camera / monitor unit.

Further, the pan head connected to the pan head control line is controlled and rotated in a predetermined rotation direction, and the screen of the external camera / monitor section is directed toward the corresponding office desk.

In this way, the operator called by the TV telephone can communicate with the other party's TV telephone by using the common external camera / monitor section for the image, and the other person can use the extension telephone on his desk for the other party for the voice. Destination TV
It becomes possible to communicate with the telephone.

[0014]

1 is a block diagram showing a first embodiment of a TV telephone terminal device of the present invention.

The multi-person TV phone 1 is connected to the ISDN line 12, the extension 9 and the extension 10. Extensions 9 and 10 are existing analog voice extension telephone lines connected to the private branch exchange 45 in the office, and the private branch exchange 45 is an exchange already used in the office and is an extension in the office. Outgoing lines and extension lines 9 and 10 from the communication line or analog line 46 or a multi-person type TV phone 1
The communication path is exchanged with another extension 11 which is not connected with the other extension. The multi-person TV phone 1 is connected to the external camera / monitor unit 3 arranged between the phones 6 and 7 by a video input / output line 42.

An operation remote controller 16 for the telephone 6 and the TV phone 1 is installed on the office desk 51, and an operation remote controller 17 for the phone 7 and the TV phone 1 is installed on the office desk 52. The telephone 6 and the telephone 7 are the local line 13 and the local line 14, respectively.
It is connected to the. Local line 13 and local line 14
Is a normal analog communication channel.

The operators of the telephone 6 and the telephone 7 use the operation remote controllers 16 and 17, respectively, to output remote control signals 43 and 44.
Can be issued to control the multi-person TV phone 1. Infrared signals are mainly used as the remote control signals 43 and 44.

An actual operation will be described below with reference to an example. When there is a call connection request by dial-in from the analog line 46 to the telephone set 6, the private branch exchange 45 sends a call signal to the extension line 9. The ringing signal on the extension 9 transparently passes through the multi-person type TV telephone 1 and is sent to the telephone 6 on the local line 13. When the telephone 6 receives the ringing signal, the ringing tone is activated to notify the operator that a call connection request has been made. When the telephone 6 goes off-hook, the analog line 46 and the telephone 6 are connected.

When the analog line 46 and the telephone 6 are connected to each other and the ISDN line 12 makes a connection request by the TV telephone communication, the multi-person type TV telephone 1 sends a calling signal to the local line 14. The telephone 7 is energized, and a video signal indicating that a videophone call is made is sent to the video input / output line 42 and displayed on the external camera / monitor section 3. Here, when the telephone 7 goes off-hook, the telephone 7 communicates the videophone voice, and
The videophone image is displayed on the external camera / monitor unit 3.

The operator of the telephone 7 can operate the multi-person type television telephone 1 by sending a remote control signal 44 from the TV telephone operation remote controller 17 to set various modes and change the bit rate of video. Become.

In this way, the operator of the telephone 7 can communicate the video image of the TV telephone with the other party's TV telephone at the external camera / monitor unit 3 arranged between the telephones 6 and 7. The voice can be communicated with the destination TV telephone on the telephone 7.

On the other hand, when there is a call connection request by dial-in from the analog line 46 to the telephone 7, the private branch exchange 45 sends a call signal to the extension 10. The ringing signal on the extension 10 transparently passes through the multi-person TV telephone 1 and is sent to the telephone 7 on the local line 14. When the telephone 7 receives the ringing signal, the ringing tone is activated to notify the operator that there is a call connection request. When the telephone 7 goes off-hook, the analog line 46 and the telephone 7 are connected.

When the analog line 46 and the telephone 7 are connected to each other and the ISDN line 12 makes a connection request by the TV telephone communication, the multi-person type TV telephone 1 sends a calling signal to the local line 13. , The telephone 6 is energized, and a video signal indicating that a videophone call has been made is transmitted to the video input / output line 42 and displayed on the external camera / monitor section 3.

When the telephone 6 is off-hook,
The telephone 6 communicates with the TV telephone voice, and the TV telephone image is displayed on the external camera / monitor unit 3.

Also, the operator of the telephone 6 can operate the multi-person type TV telephone 1 by sending a remote control signal 43 from the TV telephone operation remote controller 16 to set various modes and change the bit rate of video. Become.

As described above, the operator of the telephone 7 can communicate the video image of the TV telephone with the other party's TV telephone at the external camera / monitor unit 3 arranged between the telephones 6 and 7. The voice can be communicated with the destination TV telephone on the telephone 7.

FIG. 2 is a block diagram showing a detailed structure of the multi-person TV phone 1.

The exchange 45 sends a ringing signal to the extension 9,
When a call connection request is issued to the telephone set 6, the control unit 29 connects the switch 34 to the side a and sets the communication path to the extension 9-switch 34.
-Local line 13-Sets to the telephone 6 and transparently sends the ringing signal on the extension 9 to the telephone 6 on the local line 13. When the telephone 6 receives the ringing signal, the ringing tone is activated to notify the operator that there is a call connection request. Loop detection circuit 37 when telephone 6 goes off-hook
The off-hook current is detected at and the control unit 29 confirms that the telephone 6 is in a call state. When the extension 9 is connected to the telephone 6 and the line interface 21 receives a connection request by a TV telephone communication call from the ISDN line 12 under the control of the control unit 29, the communication path is set as follows. Since the telephone 6 is in communication, the switch 34 remains set to the side a, the switch 35 is connected to the side b so that the telephone 7 can communicate, and the subscriber circuit 30-switch 35-local line 14-telephone Set up the communication path of 7.

The subscriber circuit 30 supplies DC power to the telephone 7 and also sends a ringing signal to excite it.
When the subscriber circuit 30 is energizing the telephone 7, the TV
In order to distinguish telephone communication from voice communication, a special identification video signal is sent from the video output unit 28 to the video input / output line 42 during TV phone communication and displayed on the monitor 5 of the external camera / monitor unit 3. Let Here, when the telephone set 7 is off-hook, the loop detection section 38 detects an off-hook current, the control section 29 stops the ringing signal from the subscriber circuit 30, and the communication path is switched from the subscriber circuit section 30 to the voice encoding section 25 / The voice decoding unit 26-multiplexing / demultiplexing unit 22-is set in the line interface 21 and connected to the ISDN line 12. Multiplex
The demultiplexing unit 22 multiplexes and demultiplexes the video data, and enables TV telephone communication.

The operator of the telephone 7 can operate the multi-person TV telephone 1 by sending a remote control signal from the TV telephone remote controller 17 to set various modes and change the bit rate of video.

On the other hand, when the exchange 45 sends a call signal to the extension 10 and makes a call connection request to the telephone 7, the control unit 29 connects the switch 35 to the side a, and the call path is extended to the extension 1.
0-switch 35-local line 14-set to telephone 7 to transparently send the ringing signal on extension 10 to telephone 7 on local line 14. Upon receiving the ringing signal, the telephone set 7 sounds a ringing tone to notify the operator that a call connection request has been made.

When the telephone 7 is off-hook, the loop detection circuit 37 detects an off-hook current, and the control unit 29 confirms that the telephone 7 is in a call state.

When the extension 10 and the telephone 7 are connected and the line interface 21 receives a connection request by a TV telephone communication call from the ISDN line 12 under the control of the control unit 29, the voice communication path is set as follows. To do. Since the telephone 7 is in communication, the switch 35 remains set to the side a so that the telephone 7 can communicate with the switch 3.
4 is connected to the side b, and the communication path of the subscriber circuit 30-switch 34-local line 13-telephone 6 is set. The subscriber circuit 30 supplies DC power to the telephone 6 and sends a ringing signal to excite it.

In order to distinguish between videophone communication and voice communication when the subscriber circuit 30 is energizing the telephone 6,
At the time of a videophone, a special identification video signal is sent from the video output section 28 to the video input / output line 42 and displayed on the monitor 5 of the external camera / monitor section 3. Here, when the telephone 6 is off-hook, the loop detector 37 detects an off-hook current, the controller 29 stops the calling signal from the subscriber circuit 30, and switches the call path from the subscriber circuit unit 30 to the voice encoding unit 25. / Voice decoding unit 26-multiplexing / demultiplexing unit 22-set in the line interface 21 and connected to the ISDN line 12. The multiplexing / demultiplexing unit 22 multiplexes / demultiplexes with the video data and enables TV telephone communication.

Further, the operator of the telephone 6 operates the multi-person type TV telephone 1 by sending a remote control signal from the TV telephone operation remote controller 16, and can set various modes and change the bit rate of video. . The transmission voice signal input from the microphone of the telephone 6 or 7 during the videophone communication is A / D converted by the subscriber circuit unit 30 and then information-compressed to an appropriate bit rate by the voice encoding unit 25. The information-compressed transmission voice data is multiplexed with the transmission video data by the multiplexing / demultiplexing unit 22, sent out to the ISDN line 12 by the line interface 21, and sent to the other party's TV telephone terminal.

The voice data received from the other party's TV telephone terminal is received by the line interface 21, and then separated from the received video data by the multiplexer / demultiplexer 22. Information on the separated received voice data is decompressed by the voice decoding unit 26 and D / A converted by the subscriber circuit unit 30. The voice signal received from the subscriber circuit unit 30 is output from the speaker of the telephone 7. The transmission video signal input from the camera 4 of the external camera / monitor unit 3 is A / D converted by the video input unit 27 and then information-compressed to an appropriate bit rate by the video encoding unit 23. The information-compressed transmission video data is multiplexed with the transmission audio data by the multiplexing / demultiplexing unit 22, sent out to the ISDN line 12 by the line interface 21, and sent to the other party's TV telephone terminal. The video data received from the other party's TV telephone terminal is received by the line interface 21, and then separated from the received audio data by the multiplexer / demultiplexer 22. Information of the separated reception audio data is decompressed by the video decoding unit 24 and D / A converted by the video output unit 28. The video signal received from the video output unit 28 is displayed on the monitor 5 of the external camera / monitor unit 3.

In this way, the operator of the telephone 6 or 7 is
In video communication of TV telephone communication, telephones 6 and 7 are used.
In addition to being able to share the external camera / monitor unit 3 placed between and, in voice communication, the operator can use one existing analog telephone on the desk to perform analog extension communication from the private branch exchange and ISDN line communication. It becomes possible to share TV phone communication.

FIG. 3 shows the second part of the TV telephone terminal device of the present invention.
3 is a block diagram showing the configuration of the embodiment of FIG.

The multi-person TV phone 1 is connected to the ISDN line 12, the extension 9 and the extension 10. Extension 9
And the extension 10 are existing analog voice extension communication lines connected to the private branch exchange 45 in the office. The private branch exchange 45 is the exchange currently used in the office, such as the communication path of the office extension. A call exchange operation is performed between an external line from the analog line 46 and the extension lines 9 and 10 or another extension line 11 that is not connected to the multi-person TV phone 1.

The multi-person type TV phone 1 is connected to the external camera / monitor section 3 arranged between the phones 6 and 7 by a video input / output line 42. On the desk of the office desk 51 are the telephone 6 and the TV telephone operation remote controller 16, and on the desk of the office desk 52 is the telephone 7 and the TV telephone operation remote controller 17.
Is arranged.

The telephone 6 and the telephone 7 are the local line 13 and the local line 14, respectively.
It is connected to the. Local line 13 and local line 14
Is a normal analog communication channel. The operators of the telephone 6 and the telephone 7 are the TV operation remote controllers 16 and 1, respectively.
At 7, the remote control signals 43 and 44 are emitted to allow the multi-person type T
The V telephone 1 can be controlled. Remote control signal 4
Infrared signals are mainly used for 3 and 44. External camera
The monitor 3 is connected to the pan / tilt head 2, and the pan / tilt head 2 is connected to the multi-person type TV phone 1 and the pan / tilt head control line 41. The pan / tilt head 2 can be rotated in the rotation direction 71 and the rotation direction 72 by the control of the multi-purpose TV phone 1, and the screen directions can be directed to 60, 61, and 62.

For example, when there is a call connection request by dial-in from the analog line 46 to the telephone set 6, the private branch exchange 45 sends a call signal to the extension line 9. The ringing signal on the extension 9 transparently passes through the multi-person type TV telephone 1 and is sent to the telephone 6 on the local line 13. When the telephone 6 receives the ringing signal, the ringing tone is activated to notify the operator that a call connection request has been made. When the telephone 6 goes off-hook, the analog line 46 and the telephone 6 are connected.

When the analog line 46 and the telephone 6 are connected to each other and the ISDN line 12 makes a connection request for TV telephone communication, the multi-person type TV telephone 1 sends a call signal to the local line 14. The telephone 7 is energized, and a video signal indicating that a videophone call is made is sent to the video input / output line 42 and displayed on the external camera / monitor section 3. Further, the camera platform 2 connected to the camera platform control line 41 is controlled to rotate in the rotation direction 72, and the screen direction of the external camera / monitor unit 3 is changed to the screen direction 62.
Direction, that is, toward the office desk 52. Initialization is performed when the multi-person TV phone 1 is installed so that the screen direction 62 and the position of the phone 7 at this time match.

Here, when the telephone set 7 goes off-hook, the telephone set 7 communicates with the TV telephone voice and the TV telephone image is displayed on the external camera / monitor section 3.

Further, the operator of the telephone 7 operates the multi-person type TV telephone 1 by sending a remote control signal 44 from the TV telephone operation remote controller 17, and can set various modes and change the bit rate of the image. Become.

As described above, the operator of the telephone 7 can communicate the video image of the TV telephone with the other party's TV telephone at the external camera / monitor unit 3 arranged between the telephones 6 and 7. Since the screen direction of the external camera / monitor unit 3 faces the operator of the telephone 7, even if the external camera / monitor unit 3 is arranged between the telephones 6 and 7, the T
It can be operated as if using a V telephone terminal. The voice can be communicated with the destination TV telephone on the telephone 7.

On the contrary, when there is a call connection request by dial-in from the analog line 46 to the telephone set 7, the private branch exchange 45 sends a call signal to the extension line 10. The ringing signal on the extension 10 transparently passes through the multi-person TV telephone 1 and is sent to the telephone 7 on the local line 14. When the telephone 7 receives the ringing signal, the ringing tone is activated to notify the operator that there is a call connection request. When the telephone 7 goes off-hook, the analog line 46 and the telephone 7 are connected.

When the analog line 46 and the telephone set 7 are connected to each other and the ISDN line 12 makes a connection request by TV telephone communication, the multi-person type TV telephone set 1 sends a call signal to the local line 13. , The telephone 6 is energized, and a video signal indicating that a videophone call is made is sent to the video input / output line 42 and displayed on the external camera / monitor section 3. Further, the camera platform 2 connected to the camera platform control line 41 is controlled to rotate in the rotation direction 71,
The screen direction of the external camera / monitor unit 3 faces the screen direction 60. Initialization is performed at the time of installation of the multi-person TV phone 1 so that the screen direction 60 and the position of the phone 6 at this time match.

Here, when the telephone 6 is off-hook, the telephone 6 communicates with the TV telephone voice, and the TV telephone image is displayed on the external camera / monitor unit 3.

The operator of the telephone 6 can operate the multi-person type TV telephone 1 by sending a remote control signal 43 from the TV telephone operation remote controller 16 to set various modes and change the bit rate of video. Become.

As described above, the operator of the telephone 6 can communicate the image during the TV telephone communication with the other party's TV telephone by the external camera / monitor unit 3 arranged between the telephones 6 and 7. Since the screen direction of the external camera / monitor unit 3 faces the operator of the telephone 6,
Even when the monitor unit 3 is arranged between the telephones 6 and 7, it can be operated in the same manner as when individually using the TV telephone terminal. The voice can be communicated with the other party's TV telephone by the telephone 6.

FIG. 4 shows the second part of the TV telephone terminal device of the present invention.
FIG. 6 is a diagram showing a detailed configuration of a multi-person type TV phone 1 based on the embodiment of FIG. The above operation will be described in detail with reference to FIG.

First, in the initial state, the control unit 29 connects the switch 34 to the side a and sets the communication path to the extension 9-switch 34-.
Local line 13-set to phone 6. In addition, the switch 35 is connected to the c side and the communication path is set to the extension 10-switch 35.
-Local line 14-Set to the telephone 7.

In this initial state, when a call signal is applied to the extension 9 and a call connection request is made to the telephone 6, the call signal on the extension 9 is transparently applied to the telephone 6 on the local line 13. When the telephone 6 receives the ringing signal, the ringing tone is activated to notify the operator that there is a call connection request.

When the telephone 6 is off-hook, the loop detection circuit 37 detects an off-hook current, and the control unit 29 stores that the telephone 6 is in a call state.

When the extension 9 and the telephone 6 are connected,
When the line interface 21 receives the connection request by the TV telephone communication call from the ISDN line 12 under the control of the control unit 29, the communication path is set as follows. Since the telephone 6 is in communication, the switch 34 remains set to the side a, the switch 35 is connected to the side b so that the telephone 7 can communicate, and the subscriber circuit 30-switch 35-local line 1 is connected.
4-Set the communication path of the telephone set 7. The subscriber circuit 30 is
DC power is supplied to the telephone 7 and a calling signal is sent to excite the telephone 7.

When the subscriber circuit 30 excites the telephone 7, in order to distinguish between the video telephone communication and the voice communication, a special identification video signal is displayed on the video input / output line 42 during the videophone. It is sent from the output unit 28 and displayed on the monitor 5 of the external camera / monitor unit 3.

Further, the control unit 29 further controls the platform control line 4
The rotation direction 7 of FIG.
In order to rotate the screen direction of the external camera / monitor unit 3 toward the screen direction 62 of FIG. 3, the following control is carried out.

The platform 2 is a motor 46 for rotating the platform.
And a position resistor 47 for detecting the screen direction of the external monitor / camera. The point H of the position resistance 47 indicates a position corresponding to the screen direction 62, the point L indicates a position corresponding to the screen direction 60, and the point M indicates a position corresponding to the screen direction of the current external monitor / camera step. The voltage Va is applied to the H point of the position resistor 47. When the M point indicating the current screen direction moves, the resistance value at the M point changes, and the voltage value output from the M point also changes from 0 [V] to Va [V].

The motor 46 is a DC motor, and when a positive voltage is applied, it rotates in the direction of rotation 72 shown in FIG.
When a negative voltage is applied, it rotates in the direction of rotation 71 in FIG.

The output voltage from the point M indicating the current screen direction is applied to the direction detecting section 40 through the tripod head control line 41. The voltage at the point M is converted into a digital value by the A / D converter of the direction detection unit 40 and then input to the control unit 29, so that the control unit 29 can know the information of the current screen direction.

For example, when the camera platform 2 is rotated in the direction of rotation 72 and the screen direction of the external camera / monitor unit 3 is changed to the screen direction 62, the control unit 29 controls the motor drive unit 45 to control the motor 46. A positive voltage is applied and rotated in the direction of rotation 72, and is rotated until the voltage at point M matches the voltage value Va at point H. When they match, the application of positive voltage to motor 46 is stopped. At this time, the screen direction of the external camera / monitor unit 3 faces the screen direction 62.

When the telephone 7 is off-hook, the loop detector 38 detects the off-hook current and the controller 29
Stops the call signal from the subscriber circuit 30, and switches the call path from the subscriber circuit section 30-voice encoding section 25 / voice decoding section 26-multiplexing / separating section 22-line interface 21.
And is connected to the ISDN line 12. The multiplexing / demultiplexing unit 22 multiplexes / demultiplexes with the video data and enables TV telephone communication.

Further, the operator of the telephone 7 can operate the multi-person type TV telephone 1 by sending a remote control signal from the TV telephone operation remote controller 17 to set various modes and change the bit rate of video. .

On the contrary, in the initial state, when a call signal is applied to the extension 10 and a call connection request is made to the telephone 7, the call signal on the extension 10 is transparently applied to the telephone 6 on the local line 14. It Upon receiving the ringing signal, the telephone set 7 sounds a ringing tone to notify the operator that a call connection request has been made.

When the telephone 7 is off-hook, the loop detection circuit 37 detects an off-hook current, and the control unit 29 stores that the telephone 7 is in a call state.

When the extension 10 is connected to the telephone 7 and the line interface 21 receives a connection request by a TV telephone communication call from the ISDN line 12 under the control of the control unit 29, the voice communication path is set as follows. To do. Since the telephone 7 is in communication, the switch 35 remains set to the side a so that the telephone 7 can communicate with the switch 3.
4 is connected to the side b, and the communication path of the subscriber circuit 30-switch 34-local line 13-telephone 6 is set. The subscriber circuit 30 supplies DC power to the telephone 6 and
A call signal is sent out and the telephone 6 is made to ring.

When the subscriber circuit 30 excites the telephone 6, in order to distinguish between the video telephone communication and the voice communication, a special identification video signal is imaged to the video input / output line 42 during the video telephone. It is sent from the output unit 28 and displayed on the monitor 5 of the external camera / monitor unit 3.

Further, the control unit 29 further controls the platform control line 4
The rotation direction 7 of FIG.
In order to rotate the screen direction of the external camera / monitor unit 3 to the screen direction 60 of FIG. 3, the following control is performed.

For example, when the camera platform 2 is rotated in the direction of rotation 71 and the screen direction of the external camera / monitor unit 3 is changed to the screen direction 62, the control unit 29 controls the motor drive unit 45 to control the motor 46. A negative voltage is applied and rotated in the direction of rotation 71, and is rotated until the voltage at the point M matches the voltage value 0 [V] at the point L. When they match, the application of the negative voltage to the motor 46 is stopped. At this time, the screen direction of the external camera / monitor unit 3 faces the screen direction 60.

When the telephone 6 is off-hook, the loop detector 37 detects the off-hook current and the controller 29
Stops the call signal from the subscriber circuit 30, and switches the call path from the subscriber circuit section 30-voice encoding section 25 / voice decoding section 26-multiplexing / separating section 22-line interface 21.
And is connected to the ISDN line 12. The multiplexing / demultiplexing unit 22 multiplexes / demultiplexes with the video data and enables TV telephone communication.

Also, the operator of the telephone 6 operates the multi-person type TV telephone 1 by sending a remote control signal from the TV telephone operation remote controller 16, and can set various modes and change the bit rate of video. .

The transmission voice signal input from the microphone of the telephone 6 or 7 during the TV telephone communication is A in the subscriber circuit section 30.
After the D / D conversion, the voice encoding unit 25 compresses the information to an appropriate bit rate. The information-compressed transmission audio data is multiplexed with the transmission video data by the multiplexing / separating unit 22,
It is sent to the ISDN line 12 by the line interface 21 and sent to the videophone terminal of the other party.

The voice data received from the other party's TV telephone terminal is received by the line interface 21, and then separated from the received video data by the multiplexer / demultiplexer 22. Information on the separated received voice data is decompressed by the voice decoding unit 26 and D / A converted by the subscriber circuit unit 30. The voice signal received from the subscriber circuit unit 30 is output from the speaker of the telephone 7.

The transmission video signal input from the camera 4 of the external camera / monitor unit 3 is A / D converted by the video input unit 27, and then information-compressed to an appropriate bit rate by the video encoding unit 23. The information-compressed transmission video data is multiplexed with the transmission audio data by the multiplexing / demultiplexing unit 22, sent out to the ISDN line 12 by the line interface 21, and sent to the other party's TV telephone terminal.

Video data received from the TV phone terminal on the other side is received by the line interface 21 and then separated from the received voice data by the multiplexing / separating unit 22. Information of the separated reception audio data is decompressed by the video decoding unit 24 and D / A converted by the video output unit 28. The video signal received from the video output unit 28 is displayed on the monitor 5 of the external camera / monitor unit 3.

Thus, the operator of the telephone 6 or 7 is
In video communication of TV telephone communication, telephones 6 and 7 are used.
In addition to being able to share the external camera / monitor unit 3 placed between and, in voice communication, the operator can use one existing analog telephone on the desk to perform analog extension communication from the private branch exchange and ISDN line communication. It becomes possible to share TV phone communication.

In the present embodiment, the operability is improved by directing the direction of the monitor screen at the time of the videophone communication toward the operator.

[0079]

According to the TV telephone terminal device of the present invention, it is possible to install a TV telephone shared by a group without installing a desktop TV telephone on each office desk. An environment that allows TV telephone communication on the desk will be prepared, and it will be possible to reduce investment in equipment.

In the voice call of a videophone, the basic function of a telephone such as a handset can be replaced by an analog telephone on an individual office desk, and only one conventional analog telephone can be installed as a communication device on the desk. The complexity due to the increase in the number of devices used can be suppressed.

Further, it is not necessary to wire the ISDN line to each office desk, and the wiring work can be reduced.

According to the second aspect of the present invention, the control of the operation of the platform is linked with the incoming / outgoing call of the analog telephone on the table, so that the operation of the platform is not instructed by the operator. The operability when performing TV phone communication on each desk is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of a TV telephone terminal device of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of the TV phone 1 of FIG.

FIG. 3 is a diagram showing a configuration of a second embodiment of a TV telephone terminal device of the present invention.

4 is a block diagram showing a detailed configuration of the TV phone 1 of FIG.

FIG. 5 is a diagram showing a configuration of a conventional TV telephone terminal device.

[Explanation of symbols]

 1 Multi-person videophone 2 Pan head 3 External camera / monitor 6 Telephone 7 Telephone 29 Control unit 34 Switch 35 Switch 37 Loop detection unit 38 Loop detection unit 40 Direction detection unit 45 Motor drive unit 46 Motor drive unit 46 Motor 47 Position resistance

Claims (2)

[Claims] 1. A TV telephone terminal device for communicating a video signal and an audio signal via an ISDN line, which is connected to at least two analog extensions and at least two analog extension telephones, and is connected to an analog outside line. A subscriber circuit means for connecting an analog extension to one of the analog extension telephones, a means for separating / multiplexing the voice signal and the image signal of the ISDN line, and a video codec for video signals during videophone communication, And a means for controlling so as to communicate via a monitor and a camera and to communicate an audio signal via one of the analog telephones not connected to the analog extension. 2. A pan head unit having a variable direction for mounting the monitor and the camera, and a unit for detecting the direction of the pan head unit.
The TV telephone terminal device according to claim 1, further comprising: a unit that controls a direction of the pan head unit according to a direction of an analog extension telephone that communicates separated audio signals during the TV telephone communication. .