JPH03121689A - Communication conference terminal equipment - Google Patents

Abstract

PURPOSE:To save the time and cost by using a voice, a document, or a picture so as to proceed a conference between remote stations through one existing analog telephone network. CONSTITUTION:A telephone set 1, a picture transmitter 3 and a document transmitter 5 being existing analog line use transmitters are provided, and each equipment is provided with a selection means 15 selectively connecting to one analog telephone line 14, a storage means 11 storing tentatively a picture or a document data, a display means 12 displaying a document and picture on a same screen and a control means 18 controlling the device and means to constitute a conference terminal equipment. Then one existing analog telephone network 14 is used to make conference between remote stations in voice, document or picture. Thus, the communication time and the communication cost are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication conference terminal that conducts a conference between remote locations via a Wi telephone line using media such as audio, two documents, two images, and drawings.

[Background Art] With the development of communication and image processing technology, communication conference systems that conduct conferences between remote locations via telephone lines have been put into practical use. Depending on the media used, these conferences are called - audio conferences that use only audio within the shell, audio-drawing conferences that use audio and drawings, and video conferences that use audio and video. With the recent development of 15DN centered on 64 kilobaud (Kbit/s), audiographic conferences using audio, two-document, and drawing media using this line are also attracting attention.

The method for configuring this type of device and system is described in, for example, Transactions of the Institute of Electronics and Communication Engineers B, Vol. J 70-B.
.

No, 6. pp. 646-653. June 1987, Kori et al., "Method of Configuring Audiographic Conference Equipment."

[Problem to be solved by the invention] In the above conventional technology, in order to hold a meeting.

(1) It is necessary to use multiple lines. (2) It is necessary to use a high-speed dedicated line. (3) It is necessary to use the I5DN network, which is currently not fully developed. There were such limitations, such as high communication costs or the inability to use current equipment.

A first object of the present invention is to provide a teleconferencing terminal that can inexpensively conduct a conference between remote locations using 8 documents and 2 images using one line of the current analog telephone network.

A second object of the present invention is to provide a teleconference terminal and its system that can transmit at least audio and drawings or audio and documents simultaneously to facilitate a conference.

A third object of the present invention is to provide a teleconference terminal and its system that can synchronize the display screens of the conference terminals, that is, allow conference participants to always view the same content during a conference.

[Means for Solving the Problems] In order to achieve the above first object, a telephone 1 image transmission device which is an existing analog line transmission device is provided.

A document transmission device is provided, a selection means for selectively connecting each device to one line, a storage means for temporarily storing images or document data, a display means for displaying the two images of the document on the same screen, and the device one means. A conference terminal was constructed by providing a control means for controlling the conference terminal.

In order to achieve the second objective, in addition to the above device 9 means, a drawing transmission device and a frequency division multiplexing means for frequency division multiplexing telephone voice and drawing or document data within the analog line band are provided, Configured the terminal.

Furthermore, in order to achieve the third objective, an identifier for identifying the type or page of the document or image data to be transmitted is given in advance, and an identifier means for transmitting the identifier and decoding the received identifier is provided. , an identifier is assigned to the image or document data and stored in the storage means, and the data is transmitted to other conference terminals via the line. Then, during the conference, the Wi identifier is read out from the storage means, displayed on the display means, and transmitted to other conference terminals via the frequency division multiplexing means.

During the conference, the other conference terminal decodes the identifier received via the frequency division multiplexing means, reads out the image 9 document data to which the identifier has already been received and is stored in the storage means, and displays it on the display means. I configured the conference terminal to do so.

[Effect] Telephones transmit voice.

The image transmission device transmits image data. The document transmission device transmits document data. The selection means selects and connects each device to the analog telephone line-line.

The storage means temporarily stores the image data sent/received by the image transmission device or the document data sent/received by the document transmission device.The display means stores the document data.

Display one or more pieces of image data on the same screen. The control means sequentially controls the device 2 means according to a fixed operating procedure. That is, the telephone is connected to the line by the selection means and the other party's terminal is called. After the terminals are connected, a voice message informs the user that the document or image data temporarily stored in the storage device will be transmitted from one terminal to the other using the document transmission device or the image transmission device, and the selection means selects the option. is connected to the line and transmitted. The other terminal receives the document or image data transmitted in response to this using the document transmission device or image transmission device, and temporarily stores this data in the storage device.First, both terminals connect their telephones to the line again, The document or image data is displayed on a display means, and both terminals see the same display and conduct a conference using audio. This makes it possible to incorporate documents or images into a conventional audio-only conference, making the conference proceed smoothly. becomes.

The drawing transmission device transmits drawing data to a tablet or the like.The frequency division multiplexing device frequency-divides the analog 71 talk line band, multiplexes telephone voice and drawing or document data, and transmits the multiplexed data. In addition to the above conference format, it is possible to transmit drawing data simultaneously with audio, and to superimpose drawings, such as line drawings, pointing marks, etc., on documents or images displayed on a display means in real time while speaking. This will make the meeting run even more smoothly. It also makes it possible to transmit and display document data in real time while speaking.

The identifier means assigns an identifier for identifying the type or page of the document or image data to be transmitted. Also,
The ffi identifier is transmitted as identifier data via frequency division multiplexing means, the received identifier data is decoded, and an identifier is output. Then, an identifier is given to the document or image data to be transmitted in advance by an identifier means, and the document or image data is stored in the storage means and transmitted to other conference terminals via the line. During the conference, the identifier is used to display the intended document or image from the storage means on the display means, and the identifier is simultaneously transmitted to other conference terminals via the frequency division multiplexing means along with the audio. During the conference, the other conference terminal uses frequency division multiplexing means, 1! The identifier is received by the identifier means, and the image or document data to which the identifier has already been received and stored in the storage means is read out and displayed on the display means.

As a result, conference participants can synchronize the display screens on their terminals, that is, conference participants can always view the same content while having a conference by voice, and the conference progresses more smoothly.

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

FIG. 1 is a block diagram showing a first embodiment of a communication conference terminal according to the present invention, in which 1 is a telephone, and 2 is an image input device that outputs images captured by a camera, image scanner, etc. as bitmap image data. , 3 encodes the bitmap image data in a predetermined manner, for example, MH encoding, modulates it with a modem and transmits it to the line as an image data signal, demodulates the received image data signal with the modem, and performs predetermined decoding, for example. An image transmission device 4 outputs document code data represented by a character code sequence created by a word processor or the like as bitmap image data through MH decoding, or outputs the document code data as bitmap document data, and also imports the document code data and outputs it as bitmap image data. A document input/output device 5 that outputs document data decomposes and encodes document code data into individual character codes, modulates it with a modem, transmits it to the line as a document data signal, demodulates the received document data signal, and converts it into A document transmission device that assembles, decodes, and outputs document code data, 6 is a coordinate value string of handwriting drawn on a tablet, etc.
A drawing input device 7 outputs data (xy coordinate value point string), and 7 encodes the coordinate value string in a predetermined manner, for example into zone encoding, modulates it with a modem, transmits it as a drawing data signal, demodulates the received drawing data signal with the modem, and outputs it into a predetermined code. For example, 8 is a drawing transmission device that performs zone decoding and outputs coordinate point sequence data, 8 is an identifier input device that outputs press information such as a keyboard as an identifier for identifying the type or page of a document or image, and 9 is an identifier input device 8 10 is an identifier device for outputting identifier data for attaching an identifier to document code data, bitmap document data, or bitmap image data as identifier data, or for transmitting an identifier to a line; 10 is document code data, bitmap document data, A storage device that temporarily stores bitmap image data, etc.; 12 a display device that displays bitmap document data, coordinate value string data, and bitmap image data in a superimposed manner on a CRT or the like; 13, which frequency-divides the drawing data signal and the audio signal of the telephone 1; Select one of the frequency division multiplexing devices 14, 15, image transmission device 32, document transmission device 59, and frequency division multiplexing device 13 for multiplexing and transmitting the data to the line, and send F11! to the analog line 14! 16 is a control device that controls each device in a predetermined order.

17 is a common bus line 42 that transmits input data to each device, output data from each device, control data to each device, and address data specifying each device. All of these components constitute one conference terminal.

FIG. 2 is a block diagram showing a configuration example of the image transmission device 3 in FIG. 1, in which 31 is an image encoding/decoding circuit for encoding/decoding bitmap image data, and 32 is an image encoding/decoding circuit for transmitting digital data over an analog line. 33 is a line control circuit consisting of a 2-wire/4-wire conversion circuit for connecting a 4-wire line to a 2-wire analog telephone line, a DC circuit for controlling connection/separation of lines, a dial circuit, etc. be.

FIG. 3 is a block diagram showing an example of the configuration of the document transmission device 5 in FIG. 1, and 51 is a character code decoder that decomposes and encodes document code data into character codes and decodes the document data signal to obtain document code data. 52 is a modem, and 53 is a line control circuit.

FIG. 4 is a block diagram showing an example of the configuration of the drawing transmission device 7 in FIG.
A drawing code decoding circuit for decoding, 72 is a modem.

FIG. 5 is a block diagram showing an example of the configuration of the display device 11 in FIG. 1, in which 111 is bitmap image data;
A three-sided display memory temporarily stores bitmap document data and coordinate string data, 112 is a CRT controller 1-roller for sequentially reading out the contents of the display memory and displaying it on a CRT, and 113 is a CRT. As a result, the above three pieces of data are displayed in an overlapping manner on both sides.

FIG. 6 is a block diagram showing an example of the configuration of the frequency division multiplexing device 13 in FIG. A band eliminate filter (B) that passes the audio signal band except the signal band.
(abbreviated as E F), 133 is the output signal of BPF131 and B
An addition circuit that adds the output signal of the EF 132; 134 is a line control circuit; 135 is a telephone 1 and a line control circuit 134;
This is a selector switch that changes between Changeover switch 13
5 is when phone 1 is selected (a side) the line is phone 1
When the line control port and %134 are selected (side B), the telephone voice and drawing data signals are BPF13.
1. BEF132. The adder circuit 133 performs frequency division multiplexing and transmits the signal to the line.

FIG. 7 shows an example of the configuration of the selection device 15 in FIG. The selection switch 152 is a line hold circuit for holding the line by supplying direct current to the line control circuit of the unselected device.

Each of the devices has a built-in control circuit (not shown) built into the device, which receives control data output from the control device 16 via a common bus signal line 17 and performs predetermined operations. conduct.

Here, we will explain a method for communicating with drawings at the same time as audio.

A telewriting terminal is well known as one of these methods. This is described in detail in the ``Report on Research on Telewriting'' (Ministry of Posts and Telecommunications, April 1985).

In this embodiment, simultaneous transmission of audio and drawing and image display control during an audio conference are performed using the simultaneous audio and drawing communication system according to the telewriting standard.

The drawing input device 6. enables simultaneous audio and drawing communication according to this standard. Drawing transmission device 72 Frequency division multiplexing device 1
32 display device 12. This is telephone 1.

FIG. 8 is an explanatory diagram of telephone band division for frequency division multiplexing in the above standard. As shown in the figure, the telephone band is divided into two, and the band from 1.5 KHz to 2 KHz is allocated to the transmission of drawing data signals. This was decided because removing this band component from the audio signal does not affect the sound quality. BPF131 performs this frequency division.
．． The audio signal and the drawing data signal are multiplexed in an adder circuit 133.

The coordinate value string data drawn from the drawing input device 6 is the fourth
The drawing code decoding circuit 71 shown in the figure performs zone encoding (high-efficiency coding according to the telewriting standard), the modem 72 modulates the signal, sends it out as a drawing data signal, and the frequency division multiplexer 13 shown in Fig. 1 multiplexes it with the audio signal. digitized and sent to the line. Since the zone encoding method is explained in the above-mentioned document, the explanation will be omitted here.

The modem 72 has a standard communication speed of 300 bps and modulation method F.
SK, half-duplex communication.

Furthermore, in the above standard, not only drawing data but also command data that controls the display of this drawing data, such as simple drawing, full-scale erasing of drawing, and 9-part erasing.

Command data such as erasing by specifying lines (eraser) and marking instructions, and communication procedures for half-duplex communication are defined.

The coordinate value string data resulting from the drawing is also sent to the display device 12, and the drawing on the drawing input device 6 is displayed as is on the CRT.

The partner terminal receives the drawing data signal, decodes it, reproduces the coordinate string data, and displays the same drawing on the display device.

Next, the operation of a remote conference using the conference terminal of the embodiment shown in FIG. 1 will be explained.

FIG. 9 is a flowchart showing an example of a remote conference procedure according to this embodiment.

The operation shown in FIG. 1 will be explained below with reference to FIG. 9.

First, distribute the materials used for the meeting in advance.

In step 1), an image is inputted into the image input device 2 or a document is inputted as bitmap data into the document input/output device 4, and an identifier for distinguishing the type or page is inputted from the identifier input bag '118. Identifier data is added to the imported bitmap image or document data, and the data is temporarily stored in the storage device 11 (step 2). Next, in order to transmit these data to the other terminal, the selection device 15 connects the image transmission device 3 or document transmission device 5 to the line 14, and this line control circuit connects the corresponding transmission device (image transmission device) of the other terminal. When the image transmission device,
In the case of document transmission, the document transmission device) is connected to the calling line (step 3). Then, the bitmap image or document data with the stored identifier data is encoded and modulated by the corresponding transmission device and transmitted. The other party's terminal receives this, demodulates it, and decodes it. These operations are similar to the automatic transmission and reception of ordinary facsimile machines and word processor communication devices.

The partner terminal temporarily stores the received pit image or document data with the identifier in the storage device (step 4).

After transmitting images or documents as necessary data, the line is released (step 5).

Next, when the meeting time arrives, telephone 1 is selected using the selection device 15 and the selector switch 135 in the frequency division multiplexing device 13, connected to the line 14, calls the other party's telephone in the same way as a normal telephone, and is connected to the line. (Step 6). Note that the other party's telephone is also selected.

Then, the selector switch 135 is switched to the multiplex circuit side (b) (step 7). This makes it possible to simultaneously transmit audio and drawings and hold a conference while viewing the same drawn image (step 8).

When a pre-distributed material (image or document) is required, the corresponding identifier is input from the identifier input device 8. Then, based on the identifier data from the identifier device 9, the corresponding bitmap image or document data is read out 9 from the storage device 11 and displayed on the display device 12 (step 9).

Next, in order to display the same image or document on the other party's terminal, the identifier data is output to the drawing transmission device 7, and is encoded using the same procedure as sending command data specified in the standard instead of drawing data. The signal is modulated and transmitted via the frequency division multiplexer 13. The other party's terminal receives the identifier data signal.

It demodulates and decodes and outputs the identifier data to the common bus signal line. Then, based on this identifier data, the bitmap image or document data to which the received and temporarily stored identifier data has been added is read out from the storage device and displayed on the display device (step 10). You will see the same image or document.

As described above, the display device 12 displays the drawing coordinate string data, bitmap image data, and bitmap document data in a superimposed manner. Therefore, look at the same screen and point to the image with the drawing function.

Additions can be made (step 11). At this time, voice communication can also be performed at the same time. Of course, if there are multiple images, the display can be changed one after another by specifying them using identifiers.

To end the conference, the user switches to a telephone (step 12) and releases the line with a normal on-hook operation (step 13).

The above procedure is performed by the control device 16 sequentially outputting control data to the built-in control circuit of each device to the common bus signal line 17. This procedure may be programmed in advance in the control device 16 and performed automatically, or may be performed by manually operating a switch or the like (not shown) attached to the control device 16.

The procedure shown in Figure 9 is an example; an identifier is assigned to one image or document data and stored, the identifier data is sent by frequency division multiplexing, both sides view the same screen, and a conference is held by voice while giving instructions using the drawing function. It is based on doing. Therefore, various other modification procedures are possible.

For example, in the procedure shown in Figure 9, pre-distribution materials are sent (
(receive) and then disconnect the telephone line, but you may continue to the conference without doing so.

FIG. 10 is a flowchart showing the other side of the remote conference procedure according to this embodiment.

First, the image input device 2 inputs an image or the document input/output device 4
input the document as bitmap data (step 1), input an identifier for distinguishing the type or page from the identifier input device 8,
In step 2, identifier data is added to the imported bitmap image or document data and temporarily stored in the storage device 11 (step 2).

Next, the frequency division multiplexer 13 is selected by the selection device 15, and the selector switch 135 is switched to the a side. In other words, telephone 1 is selected. At this time, the line control circuit inside the image transmission device 39 and the document transmission device 5 is controlled by the control device 16 to keep it in an off-hook state.The line hold circuit 152 in the 0 selection device 15 is a line DC loop of the unselected device. The image transmission device 32 and the document transmission device 5 are in the above-mentioned state.

The telephone 1 is used to call the other party in a normal manner, and the lines of both terminals are connected (step 3).

Next, the image transmission device 3 or document transmission device 5 is selected by the selection device 15 in order to transmit the image or document, which has been previously imported as a distribution material and has been given identifier data, to the other party's terminal (step 4). Next, the bitmap image or document data with the stored identifier data is encoded and modulated by the corresponding transmission device and transmitted.

The other party's terminal receives this, demodulates it, and decodes it. This is then stored in the storage device (step 5).

Next, the frequency division multiplexing device 13 is selected by the 1 selection device 15, and the changeover switch therein is switched to the b side.

This makes it possible to transmit drawings at the same time as audio (step 6). The subsequent steps (steps 7 to 12) are
Since the procedure is the same as that shown in the figure, the explanation will be omitted.

The above explanation is a procedure for first distributing materials, that is, transmitting (receiving) necessary images or documents before the start of a meeting, but the present invention is not limited to this, and the present invention is not limited to this, but distributes materials during a meeting by voice and drawing. A similar procedure may be used. However, during the distribution of materials, the audio and drawings will be interrupted.

In the above explanation, the document is temporarily stored in the storage device as bitmap document data, but it may also be stored as character code data represented by a character code string. When displaying this document, the document code data read from the storage device is converted into bitmap document data by the document input/output device.

All you have to do is send it to a display device.

Also, regarding images, bitmap image data may be compressed and encoded and stored in a storage device.

This compression encoding may be the same as or different from the encoding of the image transmission device. In order to display this image, the compressed encoded data read from the storage device may be decompressed and decoded to return to the original bitmap image data, and then sent to the display device. In other words, a dedicated image encoding/decoding device is installed in the terminal.

This embodiment is shown in FIG. 11, in which input and output to and from the storage device can be performed by connecting to a common bus signal line.

FIG. 11 is a block diagram showing a second embodiment of the communication conference terminal according to the present invention, and 18 is the above-mentioned image-dedicated code/decoder. In FIG. 11, the same reference numerals as in FIG. 1 indicate the same parts. The operating procedure of this terminal is almost the same as in FIGS. 9 and 10, but this image-specific encoding/decoding procedure is inserted before and after the input/output procedure to the storage device.

With such a configuration, it is possible to reduce the storage capacity of the storage device and reduce the price.

Note that if the above encoding/decoding is made the same as that of the image encoding/decoding circuit in the image transmission device, there is no need to provide an extra image-specific encoding/decoding device, and the cost can be further reduced. can get.

In the above embodiment, it was explained that the document is transmitted via the document transmission device, but if the document is also treated as document code data represented by a character code string, the amount of information is small, and it takes a lot to modulate and transmit it. (Images have a large amount of information, and require a large transmission band to encode, modulate, and transmit. Specifically, facsimile requires a communication speed of 4,800 to 9,600 bps, (Uses most of the telephone band (300-3400Hz)).

Therefore, the communication speed is similar to that of drawing transmission (300 bps
) transmission is also practical.

FIG. 12 is a block diagram showing a third embodiment of the teleconference terminal according to the present invention, in which the same reference numerals as in FIG. 1 correspond to the same parts. In this embodiment, the modulation and demodulation for document transmission is shared with that for drawing transmission.

19 is a document drawing transmission device.

FIG. 13 is a block diagram showing a configuration example of the document drawing transmission device 19, in which 191 is the same drawing code decoding circuit as the drawing code decoding circuit 71 in the drawing transmission device 7 of FIG.
2 is a character code decoding circuit 51 in the document transmission device 5 shown in FIG.
193 is a switch for switching between the two code decoding circuits, and 194 is the same modem as the modem 72 in the drawing transmission device 7 in FIG.

When the changeover switch 193 is set to the a side, it becomes a document transmission device R, and when it is set to the b side, it becomes a drawing transmission device. And the document is modem 1
94 and sent via frequency division multiplexer 13 as a document data signal.

Therefore, it is possible to transmit documents simultaneously with audio.

The conference procedure in this embodiment is basically the same as that shown in FIGS. 9 and 10, and detailed explanation will be omitted. However, when transmitting a document, the frequency division multiplexing device 13 is selected by the selection device 15, the changeover switch 135 is set to the b side, the changeover switch 193 in the document drawing transmission device 19 is set to the a side, and the first
Unlike the embodiments shown in FIGS. 1 and 11, this document transmission can be performed by voice even while the conference is in progress, which makes the conference proceed more smoothly.

Note that the code/decoding circuits 191 and 192 in FIG.
Since the communication speed is slow at 300 baud (bps), if it is done using a program such as a microprocessor, there is no need for additional hardware.Furthermore, the character code decoding circuit is used for document code data rather than code decoding. , the operation of a speed adjustment buffer between the common bus signal line and the modem may be sufficient.

As described above, according to each embodiment, the current analog FFI network 1
Using a line, it is possible to hold a conference between remote locations using audio, 2 documents, 9 images, and drawings at low cost. In addition, this conference allows simultaneous transmission of audio and drawings, allowing conference participants to view the same screen and use the drawing function to point to images or documents as meeting materials while proceeding with the meeting. Become. And the conference can be held more smoothly than traditional audio-only conferences.

As described above, by distributing two image documents with identifier data in advance, transmitting the identifier data by frequency division multiplexing during the conference, and reading out and displaying it during the conference, screen synchronization, that is, conference participants can see the same content during the conference. disclosed a method for doing so. As shown in the procedure of FIGS. 9 and 10, the selection circuit 1
Switching between each device in Step 5 is possible because the audio is communicating.
Now, you can instruct the other party to operate the other party's terminal.0 For example, when transmitting an image or document using the procedure shown in Figure 10, tell the other party in advance by voice on the telephone that you want to transmit it. The other party is asked to manually select an image transmission device or a document transmission device using a selection device via a control device.

A method of semi-automatically performing this operation procedure, that is, a method of controlling the selection device operation of the other party's terminal from one terminal to make the meeting proceed more smoothly will be explained.

This is similar to sending identifier data, and the control device sends control data through the drawing transmission device 9 frequency division multiplexing device, specifically data that controls the selection switch 151 of the selection device, and the other terminal receives this. This is possible by decoding the information using the control device, controlling the selection device, and automatically switching the device connected to the line.

Considering a facsimile image, for example, a G-standard image, the scanning line density is 3.85 lines/I,
The bitmap data has a resolution of approximately 2000 x 1000 dots on seven sides. Therefore, when a CRT with a resolution of 640 x 400 dots/area, which is used in personal computers, is used as a display device, depending on this difference in resolution, the facsimile image is either compressed (reduced in resolution) and displayed. A method of dividing and displaying parts is required.

Lowering the resolution results in a display with unclear details, which is inconvenient for use in meetings. Therefore, the facsimile image is usually divided and displayed. In this case, it is not possible to specify the divided image using only the data for selecting the type of image, resulting in the inconvenience that different parts are displayed on both terminals.

Therefore, it becomes necessary to add and store the type of image and its division information as an identifier, and to specify the image with the identifier data and send data specifying the divided portion during the conference.

This is 1! In the same way as sending the besshi data, input the division part specification from the WT separate person input device, send the division part specification data through the identifier device, the drawing transmission device 2, the frequency division multiplexing device, and the other party terminal receives this, This is possible by decoding it with an identifier device and controlling the display device to display the corresponding divided portion.

FIG. 14 is a flowchart showing the procedure in which the above improvements have been made. First, the picture input device 2 inputs an image, or the document input/output device 4 inputs a document as bitmap data (step 1), and an identifier for distinguishing the type or page is input into each input device 8. ,
Next, input information for dividing and displaying the image or document, such as dividing the image into four at equal intervals vertically, and use the identifier device 9 to add identifier data to the imported pit map image or document data. Split display information data is added and temporarily stored in the storage device 11 (step 2
).

Next, the frequency division multiplexer 13 is selected by the selection device 15, and the selector switch 135 therein is switched to a (1111).The telephone 1 is connected to the line and the other party is called.

When connected to the other party, switch the selector switch 135 to side b (step 3). Then, selection control data for the image or document transmission device is transmitted to the other party's terminal via the drawing transmission device 7 and the frequency division multiplexing device 13. Next, the user selects an image transmission device or a document transmission device using the selection device.

The destination terminal receives the selection control data, and based on this, the control device controls the selection device to select the corresponding transmission device (step 4).

Then, the bitmap image or document data to which the stored identifier data and divided display information data are added is encoded and modulated by the corresponding transmission device and transmitted (step 5).

The other party's terminal receives this, demodulates and decodes it, and stores it in the storage device (step 6).

Next, the user selects the multiplexer 13 again (with the selector switch 135 left on the b side) and starts a conference using simultaneous voice and graphics transmission (step 7).

To display necessary materials, input an identifier in the identifier input bag @8, read out the image or document stored in the storage device 11 using the identifier data from the identifier device 9, and display it on the display device 12.
(Step 8).

At this time, the display is not divided, but the entire image is displayed with reduced definition. Then, the identifier data is transmitted to the other party terminal via the drawing transmission device 79 and the frequency division multiplexing device 13.

The other party's terminal receives this and similarly displays it on the display device based on the identifier data (step 9).

Both parties view this overall image and proceed with the meeting (Step 10)
). When performing partial division display, use the same identifier input device 8.
A designation of the divided portion is inputted in step 12, and the display device 12 displays the divided portion without reducing the definition based on the divided portion designation data from the identifier device 9 (step 11). For example, if the image is vertically divided into four, the identifier input device
”, the first divided part will be displayed. Then, the divided portion designation data is transmitted to the other party terminal via the drawing transmission device 71 and the frequency division multiplexing device 13.

The partner terminal receives this and similarly displays it on the display device based on the divided portion designation data (steps 12 and 13).
).

When a plurality of materials are involved, the above operations (excluding transmission of the materials, that is, it is desirable to distribute all materials in advance) are repeated to proceed with the conference.

To end the meeting, switch to your phone (step 1)
4), Release the line with normal on-hook (step 1)
5).

As explained above, in this embodiment, audio and drawing are simultaneously transmitted throughout the conference, and control data, identifier data, and division part specification data are sent between drawing data to control the selection device of the other party's terminal.

By making it possible to control the display, it is possible to proceed with the meeting more smoothly than in the procedure example shown in FIGS. 9 and 10.

Note that although split display has been disclosed in the above description, more complicated display operations can be performed using a similar method.

For example, scroll display, two-part enlarged display, etc. In other words, the present invention is based on controlling the display of the other party's terminal through the frequency division multiplexing device.

Note that the drawn image according to the telewriting standard is 512 x 38
Based on 4 dots/screen, high definition (
Supports displays that are twice or three times larger than the above. Therefore, when displaying the facsimile image superimposed on the facsimile image, it is desirable to use the above-mentioned extended mode so that the resolution is almost the same, and the drawing is also synchronized and divided and displayed in the same way as the facsimile image.

[Effects of the Invention] As explained above, according to the present invention, conferences can be held between remote locations using one line of the current analog telephone network using voice, two drawings, and one image, thereby reducing time and costs. can be measured.

Furthermore, since at least audio and drawings or audio and documents can be transmitted simultaneously, the conference progresses smoothly.

Furthermore, the synchronization of image or document displays on the conference terminals allows conference participants to always see the same content, making the conference proceed smoothly.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the conference terminal of the present invention, FIG. 2 is a block diagram showing a configuration example of the image transmission device in FIG. 1, and FIG. 3 is a block diagram showing a configuration example of the image transmission device in FIG. FIG. 4 is a block diagram showing an example of the configuration of the drawing transmission device in FIG. 1, FIG. 5 is a block diagram showing an example of the configuration of the display device in FIG. 1, and FIG. 7 is a block diagram showing an example of the configuration of the frequency division multiplexing device in FIG. 1, FIG. 8 is an explanatory diagram of the frequency division multiplexing area in FIG. FIG. 9 is a flowchart showing one procedure of operation of the communication conference terminal of the present invention, FIG. 10 is a flowchart showing another procedure of operation, and FIG. 11 shows a second embodiment of the communication conference terminal of the present invention. Block diagram, FIG. 12 is a block diagram showing a third embodiment of the communication conference terminal of the present invention,
FIG. 13 is a block diagram showing an example of the configuration of the document drawing and transmitting device shown in FIG. 12, and FIG. 14 is a flowchart showing another operation procedure of the communication conference terminal of the present invention. 1... Telephone, 3... Image transmission device,
5...Document transmission device, 7...Drawing transmission device, 8...Identifier input device, 11...
・Storage device, 13... Frequency division multiplexing device, 1
5... Selection device. Figure 8 Figure 10

Claims (1)

[Claims] 1. A telephone, an image transmission device or a document transmission device,
A drawing transmission device, a frequency division multiplexing device for frequency division multiplexing audio and drawings, a storage device for storing images or documents, a display device for displaying drawings and images or documents, and selecting the transmission device and connecting it to the line. A communication conference terminal comprising a selection device to be connected. 2. A teleconferencing system comprising two or more teleconferencing terminals according to claim 1 and a line connecting the teleconferencing terminals to each other, and configured to conduct a conference between remote locations. 3. In the communication conference terminal according to claim 1, an identifier for identifying the type or page of the image or document to be transmitted is given, and the image or document is stored in the storage device, transmitted, received, and stored. A communication conference terminal characterized by having a configuration in which: 4. The communication conference terminal according to claim 3, characterized in that the identifier is transmitted by a frequency division multiplexing device. 5. The communication conference terminal according to claim 4, characterized in that the corresponding image or document is read from the storage device based on the transmitted identifier and displayed on the display device. Communication conference terminal. 6. Communication characterized by comprising two or more teleconferencing terminals according to claim 3, 4 or 5 and a line connecting the teleconferencing terminals, and configured to conduct a teleconferencing between remote locations. conference system. 7. The communication conference terminal according to claim 1, wherein control data for controlling the selection device is transmitted by the frequency division multiplexing device. 8. A teleconferencing system, characterized in that it is configured to conduct a teleconferencing between two or more teleconferencing terminals according to claim 7 and remote locations connecting the teleconferencing terminals. 9. The communication conference terminal according to claim 1, characterized in that split display information is added to an image or document to be transmitted, and the image or document is stored in the storage device, transmitted, received, and stored. Telecommunications conference terminal. 10. The communication conference terminal according to claim 9, wherein the communication conference terminal is configured to transmit display operation information for dividing and displaying the divided display information based on the divided display information using a frequency division multiplexing device. 11. The communication conference terminal according to claim 10, wherein the communication conference terminal is configured to change the display on the display device based on the transmitted display operation information. 12, comprising two or more teleconferencing terminals according to claim 9, 10 or 11 and a line connecting the teleconferencing terminals,
A communication conference system characterized in that it is configured to conduct a communication conference between remote locations.