JPH03295382A - Speaker tracking type video telephone set - Google Patents

Abstract

PURPOSE:To permit a user to attain a call by means of a video telephone set without moving a handset to the direction of a display unit and a camera by separating the video telephone set into a part which can be rotated and a fixed part and automatically tracking the position of the handset by means of the display unit and the camera. CONSTITUTION:The origination means of a position informing signal is provided for the handset 103, and the telephone set mainbody is separated into the rotary part 100 provided with the display unit 162 and the camera 105, and the fixed part 101 except for the above part. Then, means 106a-106d detecting the handset position informing signal and a control means controlling the rotation of the mainbody rotation part 100 so that the display unit 102 faces a direction where the position informing signal is the strongest are provided for the mainbody rotation part 100. Then, the set is constituted so that the position of the handset 103 is detected and the display unit 102 faces the handset. Thus, the position of the handset 103 can automatically be detected even in a codeless telephone set and the display unit 102 can be rotated in the direction where the handset 103 exists.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of industrial application] The present invention relates to a video telephone device that transmits images, and particularly relates to a control method for automatically directing a display and a camera toward a handset. .

[Conventional technology]

Conventional telephones with movable displays are disclosed in Japanese Unexamined Patent Publication No. 1999-1. -13775
As described in Publication No. 5, the direction of the handset is detected based on the difference between the direction of the cord of the handset and the reference direction,
Depending on the detection result, the direction of the display was changed. Additionally, the handset coat was attached to the circumference of a circular rotary disk, and rotated as the handset was moved. It was also possible to detect the direction in three dimensions by detecting the angle of the court with respect to the horizontal plane of the rotary disk.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, each person making a call must always be aware that the direction of the cord of the handset matches the direction in which the person making the call is located. In addition, the coat of the handset of a typical telephone is curly, so in order to correctly detect the direction of the hunt cent using conventional technology, the caller must pull the coat of the handset with a certain amount of tension. There was a problem in that the user's usability was not considered, and a special code was required for practical use.

Furthermore, the prior art does not take into consideration the point that the display device is fixed in that direction after facing toward the caller.
There was a problem in that if the caller moved the cord even though the caller was not moving, the orientation of the display would change.

In addition to these, the prior art does not take into consideration the point of detecting the direction of the handset when a cordless handset is used, and there is a problem that it cannot be applied to cordless telephones.

A first object of the present invention is to automatically detect the position of the handset and to make it possible to rotate the display in a certain direction of the handset, even in cordless telephones.

A second object of the invention is to detect the location of the handset;
To make it possible to automatically control the elevation angle of a display surface and a camera so that it can be easily viewed by a caller.

A third object of the present invention is to allow the caller to manually adjust the position and elevation of the display and camera from the handset.

A fourth object of the invention is to detect the location of the handset;
An automatic tracking mode in which the direction of the display device is automatically tracked and a position fixing mode in which the positions of the display device and camera are fixed regardless of the location of the handset can be switched at the request of the caller.

C Means for Solving the Problem] In order to achieve the above first object, the present invention provides a handset with a means for transmitting a position notification signal, and divides the telephone body into a rotating part including a display and a camera, and a rotating part including a display and a camera. A sensor for detecting the handset position notification signal is installed in the rotating part of the main body, and a means is provided for controlling the rotation of the rotating part of the main body so that the display unit faces the direction in which the position notification signal is strongest. , the position of the handset is detected and the display unit is set to the handset.

In order to achieve the second objective, a means for controlling the elevation angle of the display and the camera is provided, and a straight line connecting the source of the handset position notification signal, the display, and the center of the camera is provided. It is perpendicular to the surface of

In order to achieve the third objective, the handset is equipped with an indicator indicating the amount of rotation in two directions of rotation of the rotating part of the main body.

By providing means for controlling the elevation angle of the camera and providing means for transmitting the control information from the handset to the main body on the handset and the main body, a user can remotely control the main body rotation part 9 indicator and the camera from the handset. This is how it was done.

” - In order to achieve the fourth objective 1, the handset is provided with a means for transmitting the start or end of automatic handset position tracking to the main body, and the main body determines the start and end conditions for automatic handset position tracking. And as a result,
Start or end automatic tracking of the position and direction of the main body rotating part 7 display and camera! The system is equipped with a means for rotating and fixing the display and camera according to a user's request.

[Operation] When a TV@phone handset is picked up, the video phone body detects off-hook, and after a certain period of time, detects a signal for notifying the handset location issued from the Hunt Cent. At this time, since the main body of the video telephone is divided into a rotating part and a fixed part, the rotating part of the main body rotates to orient the display in the direction of the detected hunt set. By providing the sensor for the handset position notification signal in front of the center of the display on the rotating part of the main body, the rotating part of the main body is rotated so that the sensor for the display acid detects the strongest signal. The device becomes a handset.

Furthermore, by providing a plurality of sensors on the rotating portion of the main body, the position of the source of the handset position notification signal of the handset is detected. By doing this, the elevation angle of the display and camera can be rotated so that the normal direction of the surface of the display and camera matches the direction of the straight line connecting the signal source and the rotating part of the main body. The display can be automatically moved to make it easier for the user to see, and the camera can be moved so that the user's face is in the camera's field of view. Therefore, the positions of the display and camera can be automatically adjusted to the positions used during conversation without any special instructions from the user.

Then, the handset transmits to the main body the rotational direction of the rotating part of the main body, the concave view, and the direction and amount of change in the elevation angle of the 5 display and camera.1. This information is detected on the main body side. On the main body side, the rotation control means of the rotating part of the main body, the display, and the elevation angle control means of the camera are controlled so as to perform the requested operation. When the main body receives a remote control signal from the handset, it stops processing for automatic handset tracking. In this way, the main body rotating portion 1 display and camera can be remotely controlled from the handset.

In addition, when the handset sends a signal requesting the start and end of automatic tracking of the rotating parts of the main body,
The device receives it, and then starts or ends the process for automatic handset tracking. This allows the handset to instruct the start and end of automatic position tracking of the handset in the rotating portion of the main body.

Furthermore, since the hook state of the handset is monitored in the main body, automatic tracking of the handset's position is not performed in the on-hook state. This allows you to stay on-hook and
There is no possibility of a false start of tracking the location of the handset.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a speaker tracking type video telephone device 10 according to an embodiment of the present invention. FIG. 1(,) is a front view of the display of the videophone device, FIG. 1(b) is a top view of the videophone device, and FIG. 1(c) is a front view of the display of the videophone device. It is a side view seen from the side. Videophone device 1
0 is the display 102. Camera 105 and handset 1
A main body rotating section 100 including a sensor 106 for receiving a handset position notification signal from 03, and a main body rotating section 1
00 and connects the telephone line 109 to the main body fixing part 10
Configure from scratch. Here, the display 102 indicates that the main body rotation 1
It is not placed on the surface of 00, but placed inside. For this reason,
The main body portion in front of the display 102 is a transparent display window 10.
Equipped with 7.

In this way, the entire display content can be seen only from the front of the display 102. The camera 105 can also be turned vertically and horizontally, and in order to protect the lens surface of the camera, it is placed inside the main body, and in front of the camera 105 is a transparent camera window 108 that covers the maximum field of view. Equipped with

The sensor 106 is connected to the main body rotating section 1 in the top view.
．． Rotation center ○ of 00 and display unit] One piece is placed at each intersection of the main body rotation part 100 and a straight line formed by connecting the center of 02, and a straight line that is perpendicular to the rotation center ○ and the main body rotation part 100 is placed. Place one at each intersection of the two. That is, the arrangement of the sensor 106 is as shown in FIG. 1(b).
The position is rotated by 90 degrees around the rotation center O of the main body rotation part. Moreover, these four sensors are on the same circumference. The handset 103 is wireless and transmits and receives audio between the antenna 104 and the main body. The main body detects attachment/detachment of the Hunt Scent 103 using a hook switch 110. Also, in the handset 103,
You can receive notifications of changes in hook status from the main unit and recognize on-hook and off-hook.

Then, the handset 103 sends a signal for notifying the location of the Hunt Cent to the main body, and when the state changes from the on-hook state to the off-hook state, it starts sending out the signal for notifying the location of the handset.

Furthermore, as will be described later, the sensor 106 determines whether the handset 10
Since the process of detecting the direction No. 3 is performed, a signal with a large attenuation of signal strength depending on distance is selected as the Hunt Cent position notification signal.

FIG. 2 is a block diagram showing the internal structure of the main body 10 of the speaker tracking type videophone device in one embodiment of the present invention. The main body 10 includes four sensors (sensor A 106-a) that receive the handset position notification signal.

Sensor interface circuit 20 that reads the signals of sensor B1.05-b, sensor C106-c, sensor D106d) and determines the signal strength and content of the signal.
2 and transmits its contents to the overall control section 20+.

The overall control unit 201 is composed of a microprocessor and issues processing instructions to other parts using a program running on the microprocessor. In addition, the overall control unit 201
is connected to the sensor interface circuit 202 by the bus 209.
．． Camera direction control section 2039 Display direction control section 2042
Main body rotation section rotation control section 205. Videophone communication control unit 2
06. It is connected to the storage unit 20g, and transmits commands and receives data via the bus 209.

Then, the overall control section 201 transmits operation commands to the main body rotation section rotation control section 2052, the display direction control section 204, and the camera direction control section 203, depending on the situation. The main body rotating section rotation control section 205 that has received the operation command rotates the main body rotating section 100 in the supported direction and at a rotation speed of 2 rotation amounts.
Rotate.

The display direction control unit 204 that receives the operation command rotates the display 102 in the direction and amount of rotation specified by the command. Similarly, the camera direction control section 203 also rotates the camera 105. Further, the telephone line 109 is connected to the videophone communication control unit 20
Connect to 6. The videophone communication control unit 206 separates the received signal into an image signal to be sent to the display 102 and an audio signal to be sent to the handset transmission control unit 207, and transmits each signal. In addition, the handset transmission control section 2
The audio signal received from 07 and the image signal received from camera 105 are converted into a telephone line signal format and sent to telephone line 109. Furthermore, the storage unit 208 stores programs that operate on the overall control unit 201, and stores signal strength and the like.

FIG. 3 shows a processing sequence when a video telephone device makes a call in an embodiment of the present invention. This processing is realized by a program running on the overall control unit 201.

First, when the main body detects off-hook (step 301), it waits for the user to press the dial button of the handset 103 or the main body rotation button (302). When either button is pressed, a main body rotating section rotation process is performed in which the main body rotating section rotation control section 205 drives the rotating section 100 of the main body (303).

FIG. 4 shows a processing procedure for rotating the main body rotating section. This processing is also realized by a program running on the overall control unit 201. First, the reception intensity of the location notification signal of the handset at each sensor is obtained from the sensor interface circuit 202. Here, the signal reception strength at each sensor is detected and changed at regular intervals. The signal reception intensities obtained in this way at each sensor are compared (401), and the sensor with the highest intensity and the sensor with the second intensity are determined. If the sensor with the highest intensity is the sensor 106-a located in the front of the display,
(402), the second intensity sensor is sensor 1.06-
In the case of sensor 106-b to the left of sensor 106-b, the detailed search time of the handset is set from the start of rotation (403), and rotation is started in the direction of sensor 106-b (404). If the second intensity sensor is sensor 106-d to the right of sensor 106-a, the detailed search point of the handset is similarly set from the start of rotation 405), and sensor 106-d is
Rotation is started in the direction (406). If the sensor with the highest intensity is the sensor 106-b (407), and if the second intensity sensor is the sensor 106-a, the detailed search point of the handset is set after rotation by 45 degrees (408), and the sensor 1
Rotate in the direction of 06-b (404). sensor 10 with the second intensity sensor on the opposite side of sensor 106-a;
In the case of 6-c, the detailed search time of the handset is set after 90 degree rotation (409), and the handset is rotated in the direction of the sensor 106-b (404). The strongest sensor is sensor 106-
In case c (410), if the sensor with the second intensity is sensor 106-b, the detailed search point of the handset is rotated by 13535 degrees (411), and then rotated in the direction of sensor 106-b (404).

If the second intensity sensor is sensor 106-d,
After rotating the handset details search point by 13535 degrees 4
12), rotate in the direction of the sensor 106-d (406)
.

If the sensor with the highest intensity is sensor 106-d (413
), if the second strongest sensor is sensor 106-a, the detailed search time of the handset is set after rotation by 45 degrees (414), and rotated in the direction of sensor 106-d (414).
6).

If the second intensity sensor is sensor 106-c, /
4. Set the detailed search point of Totosenoto after 90 degree rotation.
15), rotate in the direction of sensor 1.06-d (406
).

Then, when it rotates to the search start position, the rotation direction is set to S, and the signal strength at each sensor is detected again (416
). Here, the signal intensities detected by each sensor are compared, and sensor 106-a is the highest.

If it is not the second signal strength, it is determined that the position of the handset has not been determined yet (417), and the main body rotation unit rotation process is reset (418). The sensor 106a is
In the case of the highest or second signal strength, in order to detect the detailed position of the handset, the signal strength is detected in detail by the sensor 106a without changing the rotation direction of the main body rotation unit 100 (for example, 5 rotation angles 1 degree) (419). Then, the inflection point of the detected signal strength is determined. in particular,
The interval unit for detecting the detailed position is -step,
If the latest detection time point is the n-th step, the signal strength of the n-th step and the signal strength of the (n-1)th step are compared, and a step where the intensity of the n-th step is smaller than the intensity of the (n-1)th step is searched for. This continues until an inflection point is detected (402). Here, when an inflection point is detected, the rotation is stopped (421). At this time, if the step of detecting the inflection point is the nth step, the curve showing the actual signal strength is
This results in a curve indicated by a or b in FIG. That is, the true inflection point exists between the n-th step and the n-1 step, or between the nl-th step and the n-2 step. Therefore, more detailed handset position detection is performed. Specifically, the search step width is halved. Then, it is checked whether the direction of one rotation is the first search direction S (422), and if it is the first search direction S.

Change the rotation direction from S to reverse rotation direction R, and rotate the main body rotating part 10.
The reverse rotation of 0 is started (423). Then, similar processing is performed (419, 420, 421), and since the rotation direction is R, detailed position detection of the handset is completed, and the point before the rotation stop point is set to the maximum intensity of the handset position notification signal. (424).

When the processing of the main body rotating section is completed by the above processing, it is assumed that the source of the position notification signal of the handset is on the straight line formed by connecting the rotation center ○ of the main body rotating section 100 and the sensor 106-a in the top view. , sensor 106-
a and sensor 106b or.

The position of the signal source is calculated from the distance between the sensor 106d and the signal source, and the result is used to display the signal on the display 102.
and performs direction control processing for the camera 105 (304). When the call button is pressed by the user (305) or the one call timer times out (306), a call request is sent to the videophone communication control unit 206 (307). Then, the position of the main body rotating section 100 is fixed (308).

FIG. 6 shows the process flow of the main body overall control unit 201 when the user presses the manual button. This processing is realized by a program running on the overall control unit 201. Here, FIG. 7 shows the button arrangement of the handset 103 of the video telephone device in one embodiment of the present invention. The handset includes a Hunt Cent location notification signal transmitter 701 in a portion of the antenna 104 . In addition to the numeric keypad, 1 call button 7027 manual operation button 7o
3. Automatic operation button shift 042 rotation eye rotation operation button 705
．． A camera operation button 2 062 and a display operation button 707 are provided. Then, the main body rotating section 100. There are four buttons for instructing the operating direction of the camera 105 and the display 102 (upward direction 708 degrees, downward direction 709 degrees, left direction?10, right direction 71
1) Prepare. When the handset detects that these buttons are pressed, the handset position notification signal transmitter 701 sends the signal in the form of a command to the sensor 106 on the main body.

Here, when the press of the manual operation button 703 by the user is detected (600), it is checked whether the handset position is being automatically tracked (601), and if it is, it is stopped (602). Next, the main body movable part 705, the display 707. It is detected which button on the camera 706 was pressed (603). Note that if it is detected that two or more buttons are pressed simultaneously on the handset, the pressing of any button will not be recognized as valid. When the user presses the rotation operation button 705 of the main body rotation unit 100, the process waits for the user to press the left button 701 or the right button (604). Here, if there is no direction instruction after a certain period of time, or
If there is a request to operate another camera or display.

Stop operating the rotating parts of the main body. If the rotation direction is specified to the left or right, the rotation will start in the specified direction6.
05) Rotates at a constant rotation amount while the button is pressed. Then, it waits for the button in the pressed direction to be released (606). When the release of the pressed button is detected, the rotation is stopped (607).Then, the system waits for a certain period of time to see if there is a new operation request, and if a new rotation request is made to the rotating part of the main body, the rotation is stopped (607). (60g),
Returning to step 605, the process up to this point is repeated. If not, check whether an operation request for another part has occurred (
609>, if there is no such part, the process ends, and if there is, the process moves to the process of operating that part.

If the camera operation button 706 is pressed in step 603, it is determined which button was pressed next among the up/down and left/right directions (610). Then, the direction of the camera is changed in the direction of the pressed button (611).

While the pressed direction button continues to be pressed, it rotates at a constant rotation amount until the rotation angle in that direction reaches the maximum.

Then, when the release of the button that had been pressed is detected (6
12) Stop the rotation of the camera 613) If there is a new rotation request (614), repeat the process from step 611. If there is no operation request, it is checked whether there is an operation request for another part (609), and if there is no operation request, the process is terminated.

If the display operation button 707 is pressed in step 603, it is determined which button, up or down, was pressed (615). Then, the elevation angle of the display screen is changed in the direction of the pressed button (616). While the pressed direction button continues to be pressed, the elevation angle is changed by a constant rotation amount until the rotation angle in that direction reaches the maximum. Then, when the release of the pressed button is detected (617) and the rotation of the display device is stopped (618), if there is a new request for rotation of the display surface (6], 9), the process from step 616 is performed. repeat. If there is no operation request, it is checked whether there is an operation request for another part (609), and if there is no operation request, the process ends.

FIG. 8 shows the flow of processing in the main body control section 201 when a video telephone device receives a call in an embodiment of the present invention. This processing is realized by a program running on the main body control unit 201.

First, when an incoming call is detected (800), the handset 1
3 (801), and when the OFF hook is detected, a first timer is set to automatically start the process of automatically tracking the position of the handset, and a second timer is set to fix the position of the main body. Start both timers (
802). Then, the user selects the automatic tracking button 70.
4 is pressed (803) or waits for the first timer to time out (804). When the automatic tracking button 704 is pressed or the first timer times out, the main body rotating part rotates. Processing (805) and display and camera direction control processing (806) are performed.

Then, when the second timer times out (807)
, the position of the movable part is fixed (808), and the automatic tracking process ends.

As described above, according to this example, when making or receiving a call, the display and camera can be automatically pointed in the direction of the Hunt Cent, so when making a videophone call, the user can This has the effect of eliminating the need to move in accordance with the direction of the camera. Furthermore, since the user can manually operate the direction of the display and camera, there is an effect that the direction of the display and camera can be adjusted according to the user's preference. Furthermore, since the display device is placed inside the main body rather than on the surface of the main body, it is difficult to look into the display device from the side, and it is possible to improve confidentiality.

9 to 22 show other embodiments of the present invention. FIG. 9 shows a case where the handset is connected to the main body fixing part by a cord. In FIG. 10, the main body is rotated by the movable parts shown in the figure. 1st
In FIG. 1, only the display device can adjust the elevation angle.

In FIG. 12, only the camera can be rotated vertically and horizontally.

Even when the hunt cent is coated, the same effects as in the embodiment shown in FIG. 1 can be obtained.

Further, as shown in FIG. 10, by providing a movable part on the outside of the main body and increasing the number of sensors installed, it becomes possible to track the position of the Hunt Scent even if the main body is not spherical. Furthermore, even if the main body is fixed, or if either the display or camera is movable, the user can operate the direction of the display or camera.

〔Effect of the invention〕

According to the present invention, since the videophone device is separated into a rotatable part and a fixed part, the display and camera can be rotated in any direction. In addition, the handset generates a ranking notification signal, and the display and camera automatically track its position, so the user can make video calls without having to move toward the display or camera. You can make calls using . Further, since the user can manually operate the rotating part 2 display of the main body and the camera from the handset, the user can adjust the direction of the display and the camera.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a video telephone device according to an embodiment of the present invention (
a) Top view (b) and side view (C), Fig. 2 is a block diagram of the main body of the videophone device shown in Figs. A flowchart of rotation processing, FIG. 5 is an explanatory diagram showing the existence of an inflection point in signal strength, FIG. 6 is a flowchart of processing when the manual button is pressed, and FIG. 7 is a key of the handset of the video telephone device shown in FIG. 1. FIG. 8 is a front view showing the arrangement; FIG. 8 is a flowchart of processing when a call is received; FIG. 9 is a perspective view of a video telephone device with a corded handset according to another embodiment of the present invention;
FIG. 10 is a perspective view of a videophone device according to another embodiment of the present invention, in which the main body is not spherical and the movable part is outside the main body;
12 are perspective views of a video telephone device according to another embodiment of the present invention, in which the main body is fixed and only the camera and display section are movable. 100...main body rotating part, 106 middle sensor, 2
03...Camera direction control unit, 204...Display direction control unit, 205...Body rotation unit rotation control unit, 303...Body rotation unit rotation processing, 701...Handset position notification signal transmission unit . 1st n (α) No θma (1>) (C) /ρ6-a 3rd mortar rites, Aoθ invitation 7 1st closing error reclamation /? Kamev

Claims (1)

[Scope of Claims] 1. A camera for photographing a caller, a display for outputting an image, a handset for making a voice call, and hook state detection means for detecting a hook state of the handset. In a videophone device that connects to a communication line and performs voice and image calls, the main body of the videophone device is divided into a fixed part and a rotating part that rotates about the vertical direction above the fixed part. . A speaker tracking type video telephone device, characterized in that the rotating part is provided with the camera and the display, and the rotating part is rotated to rotate the directions of the camera and the display, either manually or automatically. 2. In claim 1, the handset is provided with means for transmitting a position notification signal, a plurality of sensors for detecting the position notification signal are provided in the rotating part of the main body, and the fixed part or the rotating part is provided with a means for transmitting a position notification signal. The entire videophone device includes means for detecting signal input information, means for controlling the rotation of the rotating portion, and analyzing signal input information from the sensor and transmitting control information to the means for controlling the rotation. and a means for controlling a signal source of the handset, the speaker tracking type video telephone device rotating the rotating part so that the display directly faces the signal source of the handset. 3. In claim 1, means for controlling the elevation angle of the display device is provided in the rotating part of the main body, and the display device is arranged such that a straight line connecting the signal source of the handset and the center of the display device is orthogonal to the display surface of the display device. A speaker-tracking videophone device that rotates the elevation angle. 4. In claim 1, the rotating part is provided with means for controlling the elevation angle of the camera, and a straight line connecting the position notification signal source of the handset and the center of the light receiving surface of the camera is perpendicular to the light receiving surface of the camera. A speaker-tracking videophone device that rotates the elevation angle of the camera. 5. The speaker tracking type video telephone device according to claim 1, wherein the position tracking process of the handset is started after a predetermined period of time has elapsed after the off-hook state is detected by the hook state detection means. 6. The speaker tracking type video telephone device according to claim 1, wherein the position tracking process of the handset is started when the user starts dialing number setting operation. 7. In claim 1, a signal for notifying the position of the handset is captured at the start of the position tracking process of the handset, and the intensity of the signal received at the start of the position tracking process is determined by the rotation from the positions of the last sensor and the second sensor. A handset position tracking method in a speaker tracking video telephone device that determines the rotation direction of parts and the starting point of detailed position tracking. 8. The speaker tracking type videophone device according to claim 1, wherein the sensor for detecting the position notification signal is arranged on a semi-straight line connecting the center of rotation of the rotating part of the main body and the center of the display device in the top view. . 9. In claim 7, when the sensor A located on the half line connecting the rotational center point of the rotating part and the center point of the display unit reaches the detailed position tracking start point determined to start the position tracking process, If the strength of the position notification signal at sensor A is not the strongest or second strength among the values detected by all the sensors, detailed position tracking is stopped, and after a certain period of time, handset position tracking processing is performed. Resume handset location tracking method. 10. In claim 1, the handset is provided with means for controlling the direction and amount of rotation of the rotating part, the elevation angle of the display, and the elevation angle of the camera, and means for transmitting the control information from the handset to the main body. A speaker tracking type videophone device provided in the handset and main body, and allowing a user to remotely control the rotating part, the display, and the camera from the handset. 11. The speaker tracking type video telephone device according to claim 1, wherein the signal for notifying the location of the handset uses a signal whose intensity is largely attenuated by distance. 12. In claim 1, the handset is provided with means for transmitting to the main body the start or end of automatic position tracking of the handset, and the main body is provided with means for determining conditions for starting and ending the automatic position tracking of the handset, and A means is provided to start or stop automatic tracking of the position and direction of the rotating part, the display device, and the camera depending on the result, and start or stop automatic tracking of the handset position according to a request from a user, a hook state, or a movement history. , a speaker tracking type video telephone device in which the rotating portion is rotated and fixed.