JP3178871B2 - Image communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function of taking in a screen display signal of a personal computer, compressing and expanding the screen display signal, and sharing a common personal computer screen with a plurality of image communication apparatuses via an ISDN line. The present invention relates to an image communication device having the same.

[0002]

2. Description of the Related Art In recent years, many image communication apparatuses for mutually transmitting moving images and still images using an ISDN line have been put on the market. FIG. 3 shows a configuration diagram of a conventional image communication device. In FIG. 3, reference numeral 1 denotes a conventional image communication apparatus main body, which enables mutual communication of images, sounds, and data by connecting to video / audio input / output means and an ISDN line. Reference numeral 2 denotes a camera, and reference numeral 3 denotes a monitor, which inputs and outputs images to and from the image communication apparatus main body 1. Reference numeral 4 denotes a handwriting input unit, which is used as an input unit for man-machine interface information and an input unit for handwritten information when performing a telepointing function and a telewriting function. Reference numeral 5 denotes a voice input / output unit, which includes a handset or a microphone and a speaker. Numeral 6 is a dialing input means for dialing an ISDN line.

[0003] In the conventional example, there is an image communication apparatus in which the image, voice, and handwriting input means are partially or entirely integrated, but in FIG. An example is shown in which the main body 1 and the video, audio input / output, and handwriting input means are separately divided.

[0004] The internal configuration of a conventional image communication apparatus will be described below. The data control means 7 inputs the handwritten information of the own terminal from the handwriting input means 4 via the signal line 103 and the handwritten information of the partner terminal via the signal line 105 and displays the information on the monitor 3 for the display control means 8. A handwritten signal is transmitted via a signal line 104 to perform the operation. In addition, in order to send the handwritten information of the own terminal input from the handwriting input means 4 to the partner terminal, the handwritten information of the own terminal is sent to the multiplexing / demultiplexing means 10 via the signal line 105. Data control means 7
Is controlled by the control means 13 via the signal line 111.

Next, the display control means 8 will be described. The input signal of the display control means 8 includes an image signal sent from the camera 2 via a signal line 101, a decoded image signal of a partner terminal sent from the image encoding / decoding means 9 via a signal line 106, There is a handwritten signal sent from the data control means 7 via the signal line 104, and these video signals are synthesized and switched, and are sent to the monitor 3 via the signal line 102 to display an image.
The control of the combination and the switching is performed by the control means 13 through the signal line 11.
This is done based on the control signal sent via 1.
Further, in order to send the video signal of the camera 2 to the other terminal, the image signal of the own terminal is sent to the image encoding / decoding means 9 through a signal line.
Send via 106.

The image encoding / decoding means 9 compresses and decompresses the image, and the display control means 8 inputs and outputs decoded image signals of the own terminal image signal and the other terminal image signal via a signal line 106. The multiplexing / demultiplexing means 10 inputs / outputs a coded image signal of the own terminal image signal and the other terminal image signal via a signal line 107. The image shown here can be configured as either a moving image or a still image by changing the image encoding / decoding means 9 and is not particularly limited. The control of the encoding and decoding rates of moving images, the number of frames, the compression rate of still images, and the like is performed by the control means 13 via a signal line 111.

The voice coding / decoding means 12 is for inputting / outputting voice data to / from the voice input / output means 5 and for multiplexing / demultiplexing means 10.
Means that the input / output of the encoded audio data is performed via the signal line 109. The control of switching between the voice encoding and decoding rates is performed by the control means 13 via the signal line 111.

[0008] The multiplexing / demultiplexing means 10 has its own terminal handwritten data sent from the data control means 7 via the signal line 105 and its own terminal image encoding sent from the image encoding / decoding means 9 via the signal line 107. A signal and an own terminal speech coded signal sent from the speech coding / decoding means 12 via a signal line 109 are input and multiplexed to a line interface means 11 (hereinafter abbreviated as line I / F means). The terminal composite data is transmitted via the signal line 108, and the partner terminal composite data transmitted from the line I / F means 11 via the signal line 108 is input to the data control means 7 via the signal line 105.
Via the signal line 107 to the image encoding / decoding means, and the voice code at the other terminal via the signal line 109 to the voice encoding / decoding means 12. And separates them into separate signals.
Here, multiplexing of voice data, image data, and handwritten data
The control of the switching and change of the transmission rate of the separation is performed by the control means 13 via the signal line 111.

The control means 13 inputs dial data from the dial means 6 and outputs dial information to the line I / F means 11 via the signal line 110.
These units input / output control information via a signal line 111 and control the entire image communication apparatus.

The line I / F means 11 inputs / outputs composite data of its own terminal and the partner terminal via the signal line 108 from the multiplexing / demultiplexing means 10 and dial information via the signal line 110, Provides an interface with the ISDN line.

[0011]

As described above, in the conventional configuration, a camera is used as an image input means (still images and moving images are not specified), or an image input means (not shown) is generally used as a still image input means. Since only an input means using a scanner is provided, it is not possible to share a personal computer display screen frequently used for meetings using an image communication device. Conventional PC display screen
In order to share using an SDN line, it is necessary to use common communication software on a personal computer equipped with an ISDN line I / F means and display them on each other's personal computer monitor using common application software. Can only do
In addition to being inconvenient because the range of application is too limited to be used as a meeting application, a pointing function that points to an arbitrary point on the screen even if a personal computer shared display screen used for the meeting can be obtained by the personal computer communication, In addition, there is no means that can use a telewriting function capable of combining and displaying a handwritten input and a personal computer display screen, and it is difficult to use it for a meeting.

Therefore, when a personal computer screen is required for a meeting, the personal computer screen is output once by a printer, and the output is re-captured as image data by a scanner or a document camera and transmitted to another image communication device. It was a laborious task.

[0013] The present invention solves the above-mentioned problems, and the IS
It is an object of the present invention to provide an image communication apparatus in which a personal computer display screen can be easily shared by a plurality of terminals without being affected by application software on a personal computer having a DN line I / F means.

[0014]

In order to solve the above-mentioned problems, an image communication apparatus according to the present invention transmits image information from a camera.
Image input means for inputting, and input from the input means
Image information and image information sent from the partner terminal device
Output means for outputting to a monitor, capturing means for capturing an image display signal from a personal computer or the like, and said capturing means
Detecting the frequency information from the images displayed signal taken from the to-phase
Means for transmitting to the hand terminal and transmitted from the partner terminal
Detects frequency information and generates a synchronization signal based on the frequency information
Synchronization signal processing means having means for performing
Combined with image information, image information of personal computer etc.
The information is displayed on the monitor of the partner terminal . Also,
Multiplexing for input / output of hand terminal image signal and own terminal image signal
Separation means and own terminal handwriting taken from handwriting input means
To output signal data to display control means
Control means and imported personal computer
Data from the screen display signal of the
Own terminal handwritten signal data and camera or image scanner
Process to combine or switch with the image captured from
Display control means for performing, and the display control means
The screen display signal output from the stage is encoded and
Image code for decoding the coded signal coming through the communication network
/ Decoding means and screen table of personal computer etc.
PC display signal processing means for capturing the display signal,
The personal computer display signal processing means displays the captured image.
Means for detecting frequency information from the signal and transmitting it to the partner terminal,
And the frequency information transmitted from the partner terminal is detected.
Synchronous signal provided with means for generating a synchronous signal based on wave number information
Signal processing means and when transmitting the own terminal PC display signal
Input the personal computer RGB signal from the synchronization signal processing means
A / D conversion is performed according to the obtained clock to obtain digital R
A / D conversion means for outputting a GB signal, and the A / D conversion
Digital RGB signals obtained by the
Compression processing in accordance with the clock obtained from the
Compression means for sending compressed data to memory means, and a synchronization signal
The compression means in accordance with the clock sent from the processing means
These signals are input and data control
Transmission memory to send the compression signal of the personal computer display to the terminal
When receiving the display signal of the personal computer of the partner terminal,
Data controller in accordance with the clock obtained from the period signal processing means
Accumulates the compressed signal of the other terminal PC display from the roll means
Receiving memory means for transmitting a compressed signal to the decompressing means
And the other party's terminal compressed signal from the receiving memory means.
Performs decompression processing in accordance with the lock and provides D / A conversion
Expansion means for transmitting an expansion signal, and an expansion signal from the expansion means.
Input to match the conversion clock obtained from the synchronization signal processing means.
D / A conversion and display control means
D / A conversion means and equipment for outputting hand-terminal personal computer display signals
The terminal image output from the display control means.
An image signal is output to the monitor of the terminal itself, and at the same time, the display
Own image signal output from the
Terminal handwritten signal data, personal computer, etc.
Screen display signal by the image encoding / decoding means.
Digital communication network through the multiplexing / demultiplexing means
And send it to the other party's monitor.
is there.

[0015]

[0016]

According to the above configuration, the display screen of the personal computer can be shared irrespective of the communication software and application software on the personal computer, and by using the handwriting input function of the input means provided in the image communication device, the telegraphic display can be performed on the shared screen of the personal computer. The pointing function and telewriting function can be used effectively.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an image communication device according to one embodiment of the present invention, and FIG. 2 is a configuration diagram of a personal computer display signal processing unit in the image communication device according to one embodiment of the present invention.

FIG. 1 will be described below. In FIG. 1, blocks and signals having the same numbers as those in FIG. 3 have the same functions and will not be described in detail. Reference numeral 21 denotes a main body of the image communication apparatus according to the present embodiment, in which the image coding / decoding means 9, the line I / F means 11, and the voice coding / decoding means are provided.
12, control means 13, personal computer display signal processing means 25, display control means 26, data control means 27,
The separating means 28 is mounted. Further, the image communication apparatus main body 21 includes an interface for connecting to the handwriting input means 4, the camera 2, the voice input / output means 5, the dial means 6, a personal computer 22, and a multi-scan monitor 24.

Here, the multi-scan monitor 24 is a monitor provided with means capable of displaying screens of different resolutions supporting several types of input image signals having different frequencies of the horizontal synchronizing signal and the vertical synchronizing signal. I have. The PC display screen signal is taken into the image communication apparatus main body 21 by taking in the PC screen display signal sent from the PC 22 to the PC monitor 23 via the signal line 201.

The above-mentioned image communication apparatus comprises an image communication apparatus main body 21.
And the video, audio input means, and handwriting input means are separately divided, but each may be partially or wholly integrated.

The internal configuration of the image communication device will be described below. The personal computer display signal processing means 25 transmits the personal computer display signal via the signal line 201 and the personal computer display signal data from the data control means 27 via the signal line 201.
The personal computer display signal input according to the control signal input from the control means 13 via the signal line 111 is transmitted to the display control means 26 via the signal line.
Output via 203. A detailed description of an embodiment of the personal computer display signal processing means 25 will be given in FIG.

Next, the display control means 26 will be described. The input signal of the display control means 26 includes a self-terminal image signal input from the camera 2 via the signal line 101,
The other party terminal image signal input from the image encoding / decoding means 9 via the signal line 106, the personal computer display signal of the own terminal or the other terminal input from the personal computer display signal processing means 25 via the signal line 203, There is handwritten data input from the means 27 through the signal line 205, and the display is switched by combining the display according to the control signal sent from the control means 13 through the signal line 112. An image signal is output via 202.

Here, the image signals output to the multi-scan monitor 24 are image signals having different resolutions in accordance with a camera or personal computer image display signal, and have different horizontal and vertical frequencies for synchronizing the image signals. A synchronizing signal is also output to the multi-scan monitor 24 for display. The display control means 26 also has a function of generating image signals having different resolutions according to camera image signals and personal computer image signals, and horizontal and vertical synchronization signals having different frequencies and outputting the signals to the multi-scan monitor 24, It enables display of image signals having different resolutions, and outputs the own terminal image signal to the image encoding / decoding means 9 via a signal line 106. As described above, since the display control means 26 also includes the means for synthesizing the input image, the telepointing function and the telewriting function using the handwritten input information can be used even during the display on the personal computer screen.

The data control means 27 is obtained by adding a control function of a personal computer display to the conventional data control means 7.
The personal computer display signal data via the signal line 204, the own terminal handwritten signal data via the signal line 103 from the handwriting input means 4, and the partner terminal handwritten signal data via the signal line 206 from the multiplexing / demultiplexing means 28. And the other terminal's personal computer screen display signal, and handwritten data to the display control means 26 via the signal line 205, and to the multiplexing / demultiplexing means 28 via the signal line 206 the own terminal's personal computer display signal data and its own terminal. It outputs the handwritten signal data and the screen display signal of the partner terminal PC to the PC display signal processor 25. Here, the control of the data control means 27 is performed by the control means 13 via the signal line 111.

The multiplexing / demultiplexing means 28 is obtained by adding a multiplexing / demultiplexing function of a personal computer display signal to the conventional multiplexing / demultiplexing means 10, and the personal computer display signal of its own terminal is transmitted from the data control means 27 via a signal line 206. And a handwriting input signal, and also outputs a partner terminal personal computer display signal and a partner terminal handwriting signal to the data control means 27.
Here, the control of multiplexing / demultiplexing of each signal is performed by the control means 13 via the signal line 111.

As described above, the personal computer display signal processing means 25 for fetching and processing the display signal of the personal computer, the display control means 26 for displaying on the multi-scan monitor 24 of the image communication apparatus, the audio / video By providing data control means 27 and multiplexing / demultiplexing means 28 for multiplexing / demultiplexing with other signals such as
The personal computer display screen can be shared on a plurality of image communication terminals, and a smooth meeting can be performed.

In the configuration of this embodiment, the personal computer display signal is multiplexed / separated as external data. However, it is obvious that a configuration in which the image data is replaced with a camera image signal and multiplexed / separated is sufficiently possible. is there.

Next, a detailed embodiment of the personal computer display signal processing means will be described with reference to FIG. In FIG. 2, blocks and signals having the same numbers as those in FIGS. 1 and 3 have the same functions and will not be described in detail. The control means 13 is omitted here.

The personal computer display signal processing means 30 in FIG. 2 is an example showing the personal computer display signal processing means 25 in FIG. 1 in detail, and includes an A / D conversion means 31, a D / A conversion means 32, and a compression means 3.
3, decompression means 34, transmission memory means 35, reception memory means 3
6. Consisting of synchronization signal processing means 37 and changeover switch 40.

The personal computer display signal taken into the image communication apparatus main body 21 is based on the personal computer display signal on the signal line 201 sent from the personal computer 22 to the personal computer monitor 23, based on the signal line 30.
An RGB image signal is fetched through a signal line 1 and horizontal and vertical synchronization signals (hereinafter abbreviated as HV signals) through a signal line 302.

The synchronizing signal processing means 37 is connected to the personal computer display HV signal via the signal line 302 and the data control means.
27, via the signal line 311, the other party's personal computer display HV
The signal frequency information is input to the A / D conversion means 31, compression means 33 and transmission memory means 35 via signal lines 312, 313 and 314, and to D / A conversion means via signal lines 315, 316 and 317.
32, a decompression means 34, a conversion clock and a read / write clock are supplied to the reception memory means 36, and a frequency information of the display signal of the personal computer of the own terminal via the signal line 311 to the data control means 27; An HV signal generated inside the synchronizing signal processing means 37 is supplied to 26 via a signal line 319.

That is, when transmitting the personal computer display signal of the own terminal to the other terminal, the synchronization signal processing means 37 detects the frequency of the HV signal input by the own terminal and transmits the frequency information to the other terminal; When receiving a personal computer display signal, it is provided with means for generating an HV signal that matches the personal computer display signal received from the other terminal based on the frequency information of the HV signal received from the other terminal. The configuration is such that transmission and reception of display signals can be performed.

Next, a description will be given of the flow of signal processing when transmitting the own terminal personal computer display signal. The A / D conversion means 31 inputs the personal computer RGB signal via the signal line 301 and performs A / D conversion in accordance with the clock obtained from the synchronization signal processing means 37 via the signal line 312. And outputs a digital RGB signal via a signal line 305. The compression means 33 receives a digital RGB signal via a signal line 305, performs compression processing in accordance with a clock obtained from a synchronization signal processing means 37 via a signal line 313, and performs a compression processing on the transmission memory means 35 via a signal line 307. To send compressed data. The transmission memory means 35 inputs the compressed signal via the signal line 306 in accordance with the clock sent from the synchronization signal processing means 37 and sends the terminal terminal personal computer display compression signal to the data control means 27.

A description will be given of the flow of signal processing when a display signal of a personal computer of a partner terminal is received. The receiving memory means 36 receives the signal from the data control means in accordance with the clock obtained from the synchronization signal processing means 37 via the signal line 317.
Input the compression signal of the other terminal's personal computer via 310
A compression signal is sent to the expansion means 34. The expansion means 34 receives the compression signal of the other terminal via the signal line 309 from the reception memory means 36, performs expansion processing in accordance with the clock obtained via the signal line 316, and performs signal processing on the D / A conversion means to be described later. 308
Via the extension signal. D / A conversion means 32 is a decompression means
The decompressed signal is inputted from the signal line 34 via the signal line 308, the D / A conversion is performed by the synchronous signal processing means 37 in accordance with the conversion clock obtained via the signal line 315, and the display control means 26 is supplied via the signal line 318 to the display control means 26. Outputs the display signal of the other terminal's personal computer.

The changeover switch 40 switches between the own terminal personal computer display signal and the other terminal display signal displayed on the multi-scan monitor 24 of the image communication terminal, and is controlled by the control means 13 (not shown). And the synchronization signal. The HV signal is sent to the display control means 26 from the signal line 302 or 319 via the signal line 303, and the personal computer display signal is sent from the signal line 301 or 318 via the signal line 304.

As described above, the personal computer display signal processing means 30
Are the compression, decompression, transmission / reception,
And detection, generation, transmission and reception of a synchronization signal.

[0037]

As described above, according to the present invention, the camera
Image input means for inputting the image information thereof, and the input means
Image information input by the user and sent from the partner terminal device
And output means for outputting the image information comes to the monitor, a capturing means for capturing an image display signal such as a personal computer, frequency from images displayed signal taken from said capturing means
Means for detecting the number information and transmitting it to the partner terminal, and the partner terminal
And detects frequency information transmitted from the
Synchronizing signal processing means comprising means for generating a synchronizing signal
With personal computer
The display of the image information of the terminal and the like on the monitor of the partner terminal and the provision of the synchronization signal processing means enable
・ Detecting the frequency information of the V signal and transmitting it to the partner terminal
Allows the monitor of the partner terminal to be displayed.
And the format of the image signal output from the personal computer
Even if different, the image communication device of the present invention
Detects the frequency information of the image signal and generates the synchronization signal.
To combine with the camera image information
Display image information such as data on the monitor of the own terminal and the partner terminal
And cover all monitor types .
It also inputs and outputs the partner terminal image signal and the own terminal image signal.
Multiplexing / demultiplexing means and self-
Output terminal handwriting signal data to display control means
Data control means and captured personal
Screen display signal of computer etc. and the data control
Terminal handwritten signal data from the means and camera or image
Combine or switch with images captured from a scanner, etc.
Display control means for performing a process
The screen display signal output from the roll means is encoded and decoded.
Decodes incoming coded signals via digital networks
Image encoding / decoding means, personal computer, etc.
PC display signal processing means to capture the screen display signal of
Wherein the personal computer display signal processing means
Detects frequency information from the image display signal and sends it to the partner terminal
And the frequency information transmitted from the partner terminal.
Means for generating a synchronization signal based on the frequency information
Synchronous signal processing means and the own terminal PC display signal transmitted
Input a personal computer RGB signal and perform synchronization signal processing.
Digital by performing A / D conversion in accordance with the clock obtained from stage
A / D conversion means for outputting a total RGB signal;
Digital RGB signal obtained from D conversion means is input and synchronized
Perform compression processing according to the clock obtained from the signal processing means.
Compression means for sending compressed data to the transmission memory means;
Compression in accordance with the clock sent from the
Input the signal from the
To send compressed signal of own terminal PC display to
When receiving the display signal of the other terminal PC
Data in accordance with the clock obtained from the synchronization signal processing means.
From the control means, the other terminal's personal computer display compression signal
A receiving memory for storing and sending a compressed signal to the decompression means.
And a receiving terminal compressed signal from the receiving memory means,
D / A conversion means to perform expansion processing according to the clock
Expansion means for sending an expansion signal to the
Input signal and match the conversion clock obtained from the synchronization signal processing means.
D / A conversion and display control means
D / A conversion means for outputting the display signal of the personal computer of the partner terminal;
Own terminal output from the display control means
Outputs the image signal to the monitor of the terminal itself, and simultaneously displays the image
Own terminal image signal output from the control means;
Own terminal handwritten signal data and personal computer
Etc. by the image encoding / decoding means.
Digital communication through the multiplexing / demultiplexing means.
Send to the network, display on the monitor of the partner terminal,
Since the screen transmission and reception of the personal computer screen with the image communication device,
When sending / receiving PC data via PC communication, etc.
There is no need to consider software compatibility like
Simply sharing a computer screen on multiple image communication devices
And the telera
It is possible to use
Can also be used on the display screen to increase the efficiency of meetings
be able to.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram illustrating an example of a personal computer display signal processing unit in the image communication apparatus according to one embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional image communication device.

[Explanation of symbols]

 2 Camera 4 Handwriting input means 7, 27 Data control means 8, 26 Display control means 9 Image encoding / decoding means 10, 28 Multiplexing / demultiplexing means 11 Line interface means 12 Voice encoding / decoding means 13 Control means 21 Image communication device Main unit 22 Personal computer 23 Personal computer monitor 24 Multi scan monitor 25, 30 Personal computer display signal processing means 33 Compression means 34 Expansion means

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 7/10 H04N ^7/ 14-7/173 H04N ^7/ 20-7/22

Claims (8)

(57) [Claims] 1. An image communication apparatus for performing mutual communication of image information through a digital network, the image information from the camera
Image input means for inputting information, and input from the input means.
Image information and image information sent from the partner terminal device
And output means for outputting the broadcast to the monitor, a capturing means for capturing an image display signal such as a personal computer, the capture
Detecting the frequency information from the images displayed signal taken from the unit
Means for sending to the partner terminal and
Frequency information detected and a synchronization signal is generated based on the frequency information.
Synchronizing signal processing means having means for generating
Image information of a personal computer, etc.
An image communication device for displaying image information on a monitor of a partner terminal . 2. An image display signal fetched from a fetching means.
Compress the personal computer sent from the partner terminal
2. The image communication apparatus according to claim 1, further comprising an expansion / compression means for expanding an image signal such as data . 3. A handwriting input means comprising a handwriting input means.
Image information taken in from the stage and taken in by the taking means
The image display signal and send it to the other party's terminal.
The image communication according to claim 1 or 2, wherein
apparatus. 4. The synchronization signal processing means is a personal computer of the terminal itself.
When the display signal is sent to the partner terminal, H
・ Detects the frequency of the V signal and transmits the frequency information to the partner terminal
And when receiving the PC display signal of the partner terminal
Is based on the frequency information of the HV signal received from the partner terminal.
HV that matches the PC display signal received from the partner terminal
2. The image communication apparatus according to claim 1, further comprising means for generating a signal.
Place. 5. The communication of image information through a digital communication network.
An image communication device for transmitting and receiving a multiplexed signal for inputting / outputting a partner terminal image signal and an own terminal image signal.
/ Separation means and own terminal handwritten signal data taken from handwriting input means
Control to output data to display control means
Means and a screen display signal of a captured personal computer or the like.
Own terminal handwritten signal data from the data control means.
Data and images captured from cameras, image scanners, etc.
Display control that combines or switches
Means and a screen display signal output from the display control means
And the encoded signal coming through the digital communication network
Encoding / decoding means for decoding a signal and a signal for capturing a screen display signal from a personal computer or the like.
Computer display signal processing means , wherein the personal computer display signal processing means detects frequency information from the captured image display signal and
Transmission means and frequency transmitted from the partner terminal
Detects number information and generates a synchronization signal based on the frequency information
Signal processing means provided with a personal computer RG when transmitting a personal computer display signal.
Input the B signal and match the clock obtained from the synchronization signal processing means.
A / D conversion and output digital RGB signal
A / D conversion means, and a digital RGB signal obtained from the A / D conversion means
Compression processing according to the clock obtained from the synchronization signal processing means.
Compression means for sending compressed data to the transmission memory
Stage and the clock in accordance with the clock sent from the synchronization signal processing means.
Signal from the compression means
Sending a compression signal to the terminal
Communication memory means and a synchronous signal processing
Data control according to the clock obtained from the
The compressed signal from the other party's terminal PC is stored from the
Receiving memory means for sending a compressed signal to the stage, and receiving the compressed signal of the other terminal from the receiving memory means,
To the D / A conversion means described below.
A decompression means for transmitting a decompression signal, and a decompression signal input from the decompression means and obtained from a synchronization signal processing means.
D / A conversion is performed according to the conversion clock
Outputs the partner terminal PC display signal to the roll means
D / A conversion means, and the own terminal image signal output from the display control means.
Signal to the monitor of the terminal itself, and at the same time
Own terminal image signal output from roll means and own terminal
Handwritten signal data and images from personal computers, etc.
The plane display signal is encoded by the image encoding / decoding means.
However, delivery to the digital communication network through said multiplexing / demultiplexing means
Feature, and can be displayed on the monitor of the partner terminal
Image communication device. 6. The data control means includes a personal computer table.
Terminal PC display signal data obtained from display signal processing means
Is output to the multiplexing / demultiplexing means, and the
Output terminal handwriting signal data to display control means
And the other party's personal computer screen display obtained from the multiplexing / demultiplexing means
6. A signal output to a personal computer display signal processing means.
Image communication device. 7. A multiplexing / demultiplexing means for converting a personal computer display signal.
It has a multiplexing / demultiplexing function.
Input terminal PC display signal and handwriting input signal to
Sent to digital communication network and sent from digital communication network
Signal from the other party's PC and handwritten signal from the other party's terminal
6. The signal according to claim 5, wherein the signal is output to the data control means.
Image communication device. 8. The display control means includes a camera image signal.
Image signals with different resolutions in accordance with
And horizontal and vertical sync signals with different frequencies
It has a function to output to the multi-scan monitor and the resolution
6. The image according to claim 5, wherein image signals different from each other can be displayed.
Image communication device.