JPH09130504A - Medium multiplex modem device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform medium multiplexed data transmission between an analog transmission line and a digital transmission line by incorporating all required functions for medium multiplexed data communication in one device. SOLUTION: A full duplex/half duplex/LAP(link access protocol) control part 2 applies a full duplex communication processing, a half duplex communication processing and an LAP control processing to parallel data DP1. The input/ output of a line side are connected as general purpose data DP2 to a medium multiplex/demultiplex part 3, connected to a PCM sound CODEC 5 or connected to a data modem 7 depending on the operation mode. The medium multiplex/ demultiplex part 3 inputs serial data DS1-3 and the general purpose data DP2 and forms transmission multiplexed data. Also, it demultiplexes data from reception multiplexed data and respectively outputs them as the serial data DS 1-3 and the general purpose data DP2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a media multiplexing modem device capable of media multiplexed data transmission and single media data transmission via an analog transmission line and a digital transmission line.

[0002]

2. Description of the Related Art Generally, for data transmission using an analog transmission line such as PSTN, a data modem device for converting transmitted / received digital data into transmitted / received analog data by a predetermined modulation / demodulation method has been used.

On the other hand, with the spread of ISDN in recent years,
There are increasing opportunities for data transmission between a data terminal connected to the PSTN and a data terminal connected to the ISDN.

In such a data transmission mode, normally, a terminal adapter device or the like is provided on the data terminal side connected to the ISDN, and when viewed from the data terminal, signals exchanged on the transmission line are analog signals. It was necessary to make a device that looked like it.

[0005]

However, such a conventional device has a disadvantage that the device cost is increased because the terminal adapter device is required as described above.

Further, for example, in a videophone apparatus for multiplexing a plurality of media and exchanging the media multiplexed data, the media multiplexing depending on whether it is connected to an analog transmission line such as PSTN or ISDN. Since the methods are different, there is a problem that mutual communication cannot be performed.

Further, since the conventional data modem device does not have a link access protocol (LAP) control function, it is necessary to perform error-free data transmission when transmitting data using an analog transmission line such as PSTN. It is necessary to execute special processing control and the like, which causes a problem that the processing control load on the terminal side increases.

The present invention has been made in view of the above circumstances, and enables media multiplexed data transmission between an analog transmission line and a digital transmission line and facilitates error-free data transmission on the analog transmission line. It is an object of the present invention to provide a media multiplexing modem device that can be realized.

[0009]

According to the present invention, full-duplex modem means for converting transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and the full-duplex modem means are connected to an analog transmission line. An analog input / output means for multiplexing a plurality of pieces of media information to form multiplexed transmission digital data, and a media multiplexing / separation means for separating the received multiplexed reception digital data into a plurality of pieces of media information, When exchanging audio signals via a digital transmission line, the transmission / reception signals on the digital transmission line are mutually converted into corresponding digital signals, and when exchanging data signals via the digital transmission line or analog transmission line, transmission / reception signals on the transmission line PCM voice CODEC means for inputting and outputting When performing data transmission using a link access protocol control function are those having a link access protocol control means for executing the link access protocol control function.

Also, full-duplex modem means for converting the transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and a voice signal via a digital transmission path PCM audio CODE for converting a transmission / reception signal on a digital transmission path into a corresponding digital signal when exchanging data, and for inputting / outputting a transmission / reception signal on a digital transmission path when exchanging a data signal via the digital transmission path.
When data transmission using a predetermined link access protocol control function is performed between the C means and the partner terminal, a link access protocol control means for executing the link access protocol control function is provided, and the data transmission is performed via an analog transmission path. When transmitting media multiplexed data,
The line side data input / output of the media multiplexing / separating means is connected to the full-duplex modem means.

Also, full-duplex modem means for converting the transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and a voice signal via a digital transmission path A PC for converting a transmission / reception signal on a digital transmission path into a corresponding digital signal when exchanging data, and for inputting / outputting a transmission / reception signal on a transmission path when exchanging a data signal via a digital transmission path or an analog transmission path.
When data transmission using a predetermined link access protocol control function is performed between the M voice CODEC means and the partner terminal, the M voice CODEC means is provided with a link access protocol control means for executing the link access protocol control function, and an analog transmission path is provided. When transmitting data via
The line side data input / output of the link access protocol control means is connected to the full-duplex modem means.

Also, full-duplex modem means for converting the transmitted / received digital data into transmitted / received analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and a voice signal via a digital transmission path A PC for converting a transmission / reception signal on a digital transmission path into a corresponding digital signal when exchanging data, and for inputting / outputting a transmission / reception signal on a transmission path when exchanging a data signal via a digital transmission path or an analog transmission path.
When data transmission using a predetermined link access protocol control function is performed between the M voice CODEC means and the partner terminal, the M voice CODEC means is provided with link access protocol control means for executing the link access protocol control function, and a digital transmission path is provided. When media multiplexed data is transmitted via the media multiplexing / separation means, the line side data input / output of the media multiplexing / separation means is connected to the PCM voice CODEC means.

Full-duplex modem means for converting the transmitted / received digital data into transmitted / received analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and a voice signal via a digital transmission path A PC for converting a transmission / reception signal on a digital transmission path into a corresponding digital signal when exchanging data, and for inputting / outputting a transmission / reception signal on a transmission path when exchanging a data signal via a digital transmission path or an analog transmission path.
When data transmission using a predetermined link access protocol control function is performed between the M voice CODEC means and the partner terminal, the M voice CODEC means is provided with link access protocol control means for executing the link access protocol control function, and a digital transmission path is provided. When transmitting data via
The line side data input / output of the link access protocol control means is connected to the PCM voice CODEC means.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Embodiments of the present invention will be described in detail.

FIG. 1 shows an example of a media multiplexing modem device according to an embodiment of the present invention.

In the figure, the media multiplexing modem device 1 has serial data DS1, DS
2, DS3 and parallel data DP1 are exchanged. In addition, the transmission data TXA and the reception data R are exchanged with a network control device (described later) for connecting to the PSTN.
Exchange XA. Furthermore, transmission data TXD1, T of two B channels (information channel) is transmitted between the ISDN interface (to be described later) for connecting to the ISDN.
XD2, received data RXD1, RXD2, a clock CLK of 64 KHz for bit synchronization, and a clock FSC of 8 KHz for octet synchronization every 8 bits are exchanged. In addition, the media multiplexing modem device 1 has two
It is also possible to perform data transmission using one B channel.

In the media multiplexing modem device 1, the full-duplex / half-duplex / LAP control unit 2 uses the parallel data DP.
, Full-duplex communication processing, half-duplex communication processing, and
The LAP control process is applied, and the input / output on the line side depends on the operation mode of the media multiplexer / separator 3
Connected as general-purpose data DP2 or through bus 4
Connected to PCM audio CODEC5 via
It is connected to the data modem 7 via the M bus 6.

The media multiplexer / separator 3 converts the serial data DS1, DS2 and DS3 into audio data,
In addition to being input as video data and general-purpose data, general-purpose data DP2 is input from the full-duplex / half-duplex / LAP (link access protocol) control unit 3 and ITU-T Recommendation H.264. 221 is an extended frame format (described later), which multiplexes the audio data, the video data, and the two general-purpose data to form the transmission multiplexed data. The data and the two general-purpose data are separated and output as serial data DS1, DS2, DS3 and general-purpose data DP2, respectively. That is, in this embodiment,
The serial data DS1, DS2, DS3 are handled as audio data, video data, and general-purpose data, respectively.
The input / output on the line side of the media multiplexing / separating unit 3 is
Depending on the operation mode, it is connected to the PCM voice CODEC 5 or the data modem 7 via the through bus 4.

The PCM audio CODEC 5 is based on ITU-T Recommendation G.264. 711 has a PCM voice CODEC function, and its terminal side input / output terminal is connected to the through bus 4.
The line side input / output is ISDN depending on the operation mode.
It is connected to the interface or the analog output unit 8. The PCM audio CODEC 5 has the PCM audio CODEC function turned off, and the through bus 4 and ISDN are connected.
It also has a through function for simply connecting the interface or the analog input / output unit 8.

The data modem 7 is a data modem function including a group 3 facsimile modem function (V.21 modem function, V.27ter modem function, V.29 modem function, V.14 modem function, V.32 modem function, V.32 modem function, V.32 modem function, .F
ast modem function, etc.), the terminal side input / output terminal is connected to the media multiplexer / separator 3 or the ECM bus 6 depending on the operation mode, and the line side input / output terminal is analog input / output. It is connected to the section 8 or the through bus 4.

The analog input / output unit 8 is for exchanging data with the network control device, and the terminal side input / output terminal is a PCM voice CODEC depending on its operation mode.
5 or data modem 7.

Here, the TTC standard JT-H.264 which is the basis of the operation of the media multiplexing in the media multiplexing / separating unit 3. 221 (national standard corresponding to ITU-T Recommendation H.221) will be described.

First, the TTC standard JT-H. At 221,
Data is exchanged in a multiframe format on the ISDN B channel (information channel).

As shown in FIG. 2, one multi-frame MFL includes eight sub-multi-frames SMF1 to SMF.
8 in each sub-multiframe SMF1 to SMF1.
The SMF 8 is composed of two frames each. That is, one multi-frame MFL is composed of 16 frames FLM0 to FLM15.

Each frame FLM0 to FLM15
As shown in FIG. 3, it is composed of data of 80 octets, and the respective bit positions in which these octets are arranged in the bit order form subchannels SCH1 to SCH8. Here, the transmission speed of the B channel is 64 Kb
Since it is ps and the number of data bits forming one frame is 640 bits, the time required to transmit one frame is 10 (milliseconds). That is, in this case, a frame treated as one unit when transmitting information is repeated every 10 milliseconds.

The 8th bit of the 1st octet to the 8th octet is the frame synchronization signal (Frame Ali).
The 8th bit of the 9th to 16th octets constitutes a bit rate allocation signal (Bit rate Allocation).
(Signal) BAS. Further, in the 17th to 24th octets of the subchannel SCH8, data of an encryption channel for exchanging key information for encrypting data and the like may be set (optional).

In this way, the frame synchronization signal FAS
8 bits are arranged in one frame FLM0 to FLM15, and the bit allocation is configured in units of multiframe MFL as shown in FIG.

That is, even frames FLM0, FLM
2,..., FLM14, second to eighth octets, followed by odd frames FLM1, FLM3,.
The second octet of the FLM15 contains "0011011
A horizontal sync signal composed of an 8-bit data pattern "1" is arranged, and odd-numbered frames FLM1, FLM3, ...,
In the first octet of the FLM 11, a vertical synchronization signal composed of a 6-bit data pattern “001011” is arranged.

By detecting the horizontal synchronizing signal and the vertical synchronizing signal, it is possible to detect the synchronization of one multi-frame MFL.

The 0th frame, the 2nd frame, the 4th frame
Bits N1, N2, N3, N4, and N5 of the first octet of the frame, the sixth frame, and the eighth frame are used to indicate a multiframe number. Of these, bit N5 is used to indicate whether a multi-frame number is used. As described above, since the data used for the multi-frame number is 4 bits, the multi-frame number changes in a descending order with values from 0 to 15, and the same multi-frame number appears every 16 multi-frames.

The tenth frame, the twelfth frame,
And the bit L of the first octet of the thirteenth frame
1, L2 and L3 are used to display connection numbers indicating the order of connection of the B channels carrying the frame among the B channels currently used. Also, bit R of the first octet of the fifteenth frame is reserved (reserved) for future recommendations,
Its value is set to 0.

The bit TEA of the first octet of the 14th frame is used to indicate that data transmission is not possible due to an internal failure of the data terminal device.

Also, odd-numbered frames FLM1, FLM3
.., Bit A of the third octet of FLM 15 is used to indicate whether frame synchronization or multi-frame synchronization has been established, or whether synchronization has been lost.

Also, odd-numbered frames FLM1, FLM3
,..., The fifth octet, the sixth octet, the seventh octet, and the eighth octet of the FLM 15
C2, C3 and C4 are used to indicate a CRC (Cyclic Redundancy Check) code which is referred to for data error detection (ie, channel quality detection) of two consecutive frames (ie, sub-multiframes). The bit E of the fourth octet of the odd frames FLM1, FLM3,..., FM15 is used to indicate that a transmission error has been detected on the receiving side.

The bit rate allocation signal BAS is, as shown in FIG. 5, even-numbered frames FLM0, FLM2,
, FLM14, 8-bit data representing the capability BAS or BAS command is arranged, and the second frame of the odd-numbered frames FLM1, FLM3,.
The octet contains the capability BAS sent in the previous frame.
Alternatively, a double error correction code for correcting the value of the BAS command is provided.

For example, since the type of data to be transmitted can be designated for each sub-channel, audio data and video data can be exchanged using one frame, and media multiplexing can be realized. You can

Here, the capability BAS is used for exchanging the transmission capability and the terminal function with the partner terminal, and the BAS command is a command for switching the transmission mode and various command data (user-defined). (Including those)
Used to interact. In addition, the switching of the transmission mode is performed in sub-multiframe units.

The multi-frame MFL data is transmitted in the order of frame numbers, and the respective frames FLM0 to FLM15 are transmitted in the order of octets from the 1st octet to the 80th octet, as shown in FIG. The first bit of the octet is sent first.

That is, each of the frames FLM0 to FLM0
In the FLM 15, the first bit of the first octet is transmitted first, and the eighth bit of the 80th octet is transmitted last.

As described above, the TTC standard JT-
H. In 221, a frame treated as one unit when transmitting information is repeated every 10 milliseconds,
This frame is applied at the time of data transmission using the media multiplexing / separating unit 3, the through path 4, and the PCM voice CODEC 5 in the media multiplexing modem device 1.

Therefore, considering the data format of the frame used in the data transmission performed using the media multiplexer / separator 3, the data modem 7, and the analog input / output unit 8, the above-mentioned TTC standard JT-H. Since it is preferable for the device configuration of the media multiplexing / separating unit 3 to make the data format compatible with the frame 221 of the frame, the data format of the frame when the data modem 7 is used is as follows in this embodiment. To set.

For example, the data transmission rate of the data modem 7 is V. When it is set to 14400bps of 14 modem function, the transmission time of 1 frame is 10 (milliseconds),
Each frame can contain 144 bits (= 18 octets) of data.

Therefore, the sub-channel structure is the above-mentioned TTC standard JT-H. When 8 subchannels are set to match the 221 frame, the frame structure in this case is
The data format is as shown in FIG. That is, in this case, one frame consists of 18 octets, and the bit position of each octet is the subchannels SCH1 to SCH1.
Configure SCH8.

At the same time, the eighth bit of the first octet to the eighth octet constitutes the frame synchronization signal FAS, and the eighth bit of the ninth octet to the sixteenth octet constitutes the bit rate allocation signal BAS.

Further, the data transmission rate of the data modem 7 is V. When the 14 modem function is set to 19200 bps, the transmission time of one frame is 10 (milliseconds), so that each frame can include 192 bits (= 24 octets) of data.

Therefore, the sub-channel configuration is the TTC standard JT-H. When 8 subchannels are set to match the 221 frame, the frame structure in this case is
The data format is as shown in FIG. That is, in this case, one frame consists of 24 octets, and the bit position of each octet is defined by the subchannels SCH1 to SCH1.
Configure SCH8.

At the same time, the 8th bit from the 1st octet to the 8th octet constitutes the frame synchronization signal FAS, and the 8th bit from the 9th octet to the 16th octet constitutes the bit rate allocation signal BAS.

The data transmission speed of the data modem 7 is V.70. When the 32 modem function is set to 28800 bps, the transmission time of one frame is 10 (milliseconds), so that each frame can include 288 bits (= 36 octets) of data.

Therefore, the sub-channel structure is the above-mentioned TTC standard JT-H. When 8 subchannels are set to match the 221 frame, the frame structure in this case is
The data format is as shown in FIG. That is, in this case, one frame consists of 36 octets, and the bit position of each octet is the subchannels SCH1 to SCH1.
Configure SCH8.

At the same time, the 8th bit of the 1st octet to the 8th octet constitutes the frame synchronization signal FAS, and the 8th bit of the 9th octet to the 16th octet constitutes the bit rate allocation signal BAS.

In this way, the media multiplexing / separating unit 3 is provided with the ITU-T Recommendation H.264. 221 conforming to the frame format data multiplexing function and ITU-T Recommendation H.264. 2
21 has an extended frame format data multiplexing function, and these functions are switched depending on the operation mode and used.

FIG. 10 shows an example of connection with the PSTN when the media multiplexing modem device 1 is applied to a data communication terminal device using the PSTN as a transmission path.

In the figure, the media multiplexing modem device 1 is connected to the PSTN via a network control device 10 having an automatic call originating / receiving function for connecting to the PSTN.
Transmission data TXA and reception data RXA are exchanged between the media multiplexing modem device 1 and the network control device 10 to perform data communication.

Further, the media multiplexing modem device 1 and the network control device 10 are connected to a CPU bus of a microcomputer system (not shown) which constitutes the control means of the data terminal device, and the control means via the CPU bus. Exchange various data between them.

Also, the media multiplexing modem device 1 converts the serial data DS1, DS2, DS3 and the parallel data DP1 into the audio part, the video part, and the video part, respectively.
The audio data, video data, and general-purpose data are exchanged with the general-purpose data section.

FIG. 11 shows an example of connection with the ISDN when the media multiplexing modem device 1 is applied to a data communication terminal device using ISDN as a transmission path.

In the figure, the media multiplexing modem device 1 is connected to the ISDN, and is also connected to the ISDN via the ISDN interface 11 having the ISDN layer 1 function and the layer 2 function. Between the media multiplexing modem device 1 and the ISDN interface 11, transmission data T of two B channels (information channels) is transmitted.
XD1, TXD2, received data RXD1, RXD2, 64 KHz clock CLK and 8 for bit synchronization
An 8 KHz clock FSC for octet synchronization for each bit is exchanged to perform data communication.

Further, the media multiplexing modem device 1 and the ISDN interface 11 are connected to a CPU (central processing unit) bus of a microcomputer system (not shown) which constitutes the control means of the data terminal device, and this C
Various data are exchanged with the control means via the PU bus.

Also in this case, the media multiplexing modem device 1 sends the serial data DS1, DS2, DS3, and the parallel data DP1 to the audio section, the video section, and the general-purpose data section, respectively. Exchanged as audio data, video data, and general-purpose data.

FIG. 12 shows an example of a configuration in which this media multiplexing modem device 1 is applied to a telewriting communication terminal device using PSTN as a transmission line. In the figure, the same parts as those in FIG. 10 and corresponding parts are designated by the same reference numerals.

In the figure, the system control unit 21 executes the operation control of each unit of the telewriting communication terminal device and the control operation such as a predetermined telewriting communication control procedure process. ,
The control program executed by the system control unit 21 and various data necessary for executing the control program are stored, and the work area of the system control unit 21 is configured. The lighting communication terminal device stores various information unique to the lighting communication terminal device (for example, abbreviated dial information and the like), and the clock circuit 24 outputs current time information and calendar information and the like.

The touch panel device 25 realizes an input means for handwriting input of the telewriting communication terminal device, and the liquid crystal display device 26 displays and outputs the handwriting input result, the received handwriting input information and the like. belongs to. The touch panel device 25 and the liquid crystal display device 26 also constitute an operation display unit 27 for operating the telewriting communication terminal device.

The voice input / output device 28 is for telephone communication, and its voice input / output signal is connected to the serial data DS1 of the media multiplexing modem device 1 as voice data via the voice CODEC 29.

The data for the telewriting communication is general-purpose data as the media multiplexing modem device 1
Connected to serial data DS3.

The network control device 10 is for connecting this telewriting communication terminal device to the PSTN.
It is equipped with an automatic call origination / termination function.

The system controller 21, system memory 22, parameter memory 23, clock circuit 24, touch panel device 25, liquid crystal display device 26, voice input / output device 2
8. The media multiplexing modem device 1 and the network control device 10 are connected to an internal bus (CPU bus) 30, and data exchange between these respective elements is performed mainly via this internal bus 30. It is being appreciated.

In this case, in the media multiplexing modem device 1, the serial data DS1 and DS3 input to the media multiplexing / separating unit 3 are multiplexed as voice data and general-purpose data, and the media multiplexing / separating unit 3 outputs the serial data DS1 and DS3. The output transmission multiplexed data is data-modulated by the data modem 7 and transmitted via the analog input / output unit 8 to the transmission data TX.
A is sent to the PSTN via the network control device 10.

The signal received from the PSTN is added to the media multiplexing modem device 1 as the reception data RXA from the network control device 10. This received data RXA is
It is added to the data modem 7 via the analog input / output unit 8 and, after data modulation, is added to the media multiplexing / separating unit 3 as reception multiplexed data.

The media multiplexing / separating unit 3 separates the original voice data and general-purpose data from the input reception multiplexed data, and serial data DS1 and DS3, respectively.
Output as

As a result, the media multiplexing modem device 1
, And telewriting communication using PSTN is appropriately performed.

FIG. 13 shows an example of the configuration when the media multiplexing modem device 1 is applied to a group 3 facsimile device using PSTN as a transmission path.
In the figure, the same parts as those in FIG. 10 and corresponding parts are designated by the same reference numerals.

In the figure, the system control section 31 performs control processing of each section of the group 3 facsimile apparatus and facsimile transmission control procedure processing.
The system memory 32 stores a control processing program executed by the system control unit 31 and various data necessary for executing the processing program, and constitutes a work area of the system control unit 31. The memory 33 is for storing various kinds of information unique to the group 3 facsimile machine, and the clock circuit 34 is for outputting current time information, calendar information and the like.

The scanner 35 is for reading an original image at a predetermined resolution, the plotter 36 is for recording and outputting an image at a predetermined resolution, and the operation display unit 7 is a facsimile device. It is used for operation and consists of various operation keys and various indicators.

The encoding / decoding unit 38 is for encoding and compressing the image signal and for decoding the encoded and compressed image information into the original image signal.
Is for storing a large number of coded and compressed image information.

The data for the group 3 facsimile communication is connected to the parallel data DP1 of the media multiplexing modem device 1 as general-purpose data.

The network control device 10 is for connecting this telewriting communication terminal device to the PSTN.
It is equipped with an automatic call origination / termination function.

These system control unit 31, system memory 32, parameter memory 33, clock circuit 34, scanner 35, plotter 36, operation display unit 37, encoding / decoding unit 38, image storage device 39, media multiplexing modem. The device 1 and the network control device 10 have an internal bus (CPU
Bus 40), and data is exchanged between these respective elements mainly via the internal bus 40.

In this case, when the group 3 facsimile communication mode is set to the non-ECM mode, the full-duplex / half-duplex / LAP control section 2 changes the full-duplex / half-duplex / LAP control section 2 according to the type of the data modem function used at that time. Set to Duplex or Half Duplex state and to LAP Through mode.

Then, in the media multiplexing modem device 1, the full-duplex / half-duplex / LA is used as the parallel data DP1.
The data input to the P control unit 2 is added to the data modem 7 via the ECM bus 6, is data-modulated by the data modem 7, and is transmitted to the network control device 10 as transmission data TXA via the analog input / output unit 8. It is added and sent from the network control device 10 to the PSTN.

The signal received from the PSTN is added to the media multiplexing modem device 1 as the reception data RXA from the network control device 10. This received data RXA is
It is applied to the data modem 7 via the analog input / output unit 8 and, after being data-modulated, applied to the full-duplex / half-duplex / LAP control unit 2 via the ECM bus 6. The parallel data DP1 is output from the LAP control unit 2.

When the group 3 facsimile communication mode is set to the ECM mode (or the file transfer mode, etc.), the full-duplex / half-duplex / LAP control section 2 determines the data modem used at that time. Depending on the type of function, the full-duplex or half-duplex state and the LAP on mode are set.

Then, in the media multiplexing modem device 1, the full-duplex / half-duplex / LA is used as the parallel data DP1.
The data input to the P control unit 2 is converted into data having a frame structure according to LAP, added to the data modem 7 via the ECM bus 6, modulated by the data modem 7, and the analog input / output unit 8 is supplied. Through the transmission data TX
A is added to the network control device 10 and the network control device 10
Sent to the PSTN.

The signal received from the PSTN is added to the media multiplexing modem device 1 as the reception data RXA from the network control device 10. This received data RXA is
It is applied to the data modem 7 via the analog input / output unit 8 and, after being data-modulated, applied to the full-duplex / half-duplex / LAP control unit 2 via the ECM bus 6.

In this case, since the LAP ON mode is set, the full-duplex / half-duplex / LAP control section 2
Based on the received data, error detection according to LAP is performed.

At this time, if an error is detected, a retransmission procedure on the LAP is executed for error recovery. Therefore, the full-duplex / half-duplex / LAP control unit 2 executes the operation of retransmitting the data requested for retransmission when the retransmission procedure on the LAP is started from the partner terminal. Also,
If no error is detected, the received data is LAP.
Full-duplex / half-duplex / parallel data D from LAP controller 2
It is output as P1.

The ECM mode in the above embodiment is the standard E in the group 3 facsimile function.
Although the operation mode is different from the CM mode, the full-duplex / half-duplex / LAP control unit 2 can be used to realize the ECM mode operation in the group 3 facsimile function.

As a result, the media multiplexing modem device 1
And the group 3 facsimile communication using PSTN is appropriately executed.

FIG. 14 shows an example of a videophone communication terminal device using PSTN as a transmission path. In the figure, the same parts as those in FIG. 10 and the corresponding parts are designated by the same reference numerals.

In the figure, the system control section 41 controls the operation of each section of the videophone communication terminal device, and
The system memory 42 stores a control program executed by the system control unit 41 and various data necessary for executing the control program. In addition, it constitutes a work area of the system control unit 41, and the parameter memory 43 stores various information (for example, abbreviated dial information etc.) peculiar to this videophone communication terminal device, The circuit 44 outputs current time information, calendar information and the like. The operation display unit 45 is for operating the videophone communication terminal device.

The voice input / output device 46 is for telephone communication, and its voice input / output signal is connected to the serial data DS1 of the media multiplexing modem device 1 as voice data via the voice CODEC 47.

The video camera device 48 is for taking an image on the user side of the videophone communication terminal device, and the video signal output from the video camera device 48 is input to the video signal input terminal of the video CODEC 49. In addition to being added, it is added to the moving image signal input end of the display control unit 50. The video camera control unit 51 is for controlling operations such as shooting on / off, zooming in / zooming out, and panning of the video camera device 48.

The video CODEC 49 converts the analog NTSC format moving image signal input from the video camera device 48 into corresponding digital moving image data, converts the moving image data into predetermined CIF format moving image data, and further, TTC. Standard JT-H. In addition to encoding and compressing to form moving image information, the moving image information in the encoded and compressed state is converted into original CIF format moving image data, and the moving image data is converted into NTSC format moving image data. Then, the moving image data is converted from digital to analog and converted into a moving image signal in an analog NTSC format.
Further, the video CODEC 49 connects the moving image information to the serial data DS2 of the media multiplexing modem device 1.

The display controller 50 includes a video monitor device 51.
The display contents of the screen displayed on the screen are controlled by a command from the system control unit 41.
8 or the display screen information of the display screen information of the moving image signal input from the video CODEC 49 is formed, and the display screen of the video monitor device 52 is configured in a mode in which the display screen information is appropriately combined.

The network control device 10 is for connecting the videophone communication terminal device to the PSTN, and has an automatic call originating / receiving function.

The system control unit 41, system memory 42, parameter memory 43, clock circuit 44, operation display unit 45, audio input / output device 46, media multiplexing modem device 1, video CODEC 49, display control unit 50, video camera. The control unit 51 and the network control device 10 are connected to an internal bus (CPU bus) 53, and data is exchanged between these respective elements mainly by the internal bus 5.
It is done through 3.

In this case, in the media multiplexing modem device 1, the serial data DS1 and DS2 input to the media multiplexing / separating unit 3 are multiplexed as audio data and video (video) data, and media multiplexing / separation is performed. The transmission multiplexed data output from the unit 3 is the data modem 7
The data is modulated by the analog input / output unit 8 and transmitted as transmission data TXA through the network control device 10 and PS.
It is sent to the TN.

The signal received from the PSTN is added to the media multiplexing modem device 1 as the reception data RXA from the network control device 10. This received data RXA is
It is added to the data modem 7 via the analog input / output unit 8 and, after data modulation, is added to the media multiplexing / separating unit 3 as reception multiplexed data.

The media multiplexing / separating unit 3 separates the original audio data and the video data from the input received multiplexed data, and outputs the serial data DS1 and DS, respectively.
Output as 2.

As a result, the media multiplexing modem device 1
And the videophone communication using PSTN is appropriately executed.

FIG. 15 shows a configuration example in which the media multiplexing modem device 1 is applied to a telewriting communication terminal device which uses ISDN as a transmission path. In the figure, the same parts as those in FIG. 11 and corresponding parts are designated by the same reference numerals.

In the figure, the system control unit 55 executes the operation control of each unit of this telewriting communication terminal device, and the control operation such as a predetermined telewriting communication control procedure process. ,
The control program executed by the system control unit 55 and various data necessary for executing the control program are stored, and the work area of the system control unit 55 is configured. The lighting communication terminal device stores various information unique to the lighting communication terminal device (for example, abbreviated dial information or the like), and the clock circuit 58 outputs current time information or calendar information.

The touch panel device 59 realizes an input means for handwriting input of the telewriting communication terminal device, and the liquid crystal display device 60 displays and outputs the handwriting input result and the received handwriting input information. belongs to. The touch panel device 59 and the liquid crystal display device 60 also constitute an operation display unit 61 for operating the telewriting communication terminal device.

The voice input / output device 62 is for voice communication, and its voice input / output signal is connected to the serial data DS1 of the media multiplexing modem device 1 as voice data via the voice CODEC 63.

Further, the data for telewriting communication is general-purpose data as the media multiplexing modem device 1
Connected to serial data DS3.

The ISDN interface circuit 64 is an IS
In addition to being connected to the DN, the signal processing function of the layer 1 of ISDN and the integration / separation function of the D channel signal and the two B channel signals are provided. Exchange and again
The signals of the two B channels are media multiplexing modem devices 1
I am interacting with.

The D channel transmission control unit 65 has a layer 2 signal processing function of the D channel and a call control processing function for connecting / disconnecting one or two B channels.

Further, the system controller 55, system memory 56, parameter memory 57, clock circuit 58, touch panel device 59, liquid crystal display device 60, voice input / output device 6
2. The media multiplexing modem device 1, the ISDN interface 64, and the D-channel transmission control unit 65 are connected to an internal bus (CPU bus) 66, and the exchange of data between these respective elements is mainly done by this internal unit. Bus 6
It is done through 6.

In this case, in the media multiplexing modem device 1, the serial data DS1 and DS3 input to the media multiplexing / separating unit 3 are multiplexed as voice data and general-purpose data, and the media multiplexing / separating unit 3 outputs the serial data DS1 and DS3. The output multiplexed data is output to the PCM via the through bus 4.
Added to audio CODEC5. In this case, the PCM voice CODEC 5 has the through function set, and therefore the PCM voice CODEC 5 outputs the input transmission multiplexed data as it is to the ISDN interface 64 as the transmission data TXD1 (or TXD2), It is sent to the ISDN via the ISDN interface 64.

The signal received from ISDN is IS
Received data RXD1 (or RXD2) is added from the DN interface 64 to the media multiplexing modem device 1. This received data RXD1 is PCM audio COD
It is added as reception multiplexed data to the media multiplexing / separating unit 3 via the EC 5 and the through bus 4.

The media multiplexing / separating unit 3 separates the original audio data and the general-purpose data from the input received multiplexed data, and serial data DS1 and DS3, respectively.
Output as

Thus, the media multiplexing modem device 1
Is applied, and telewriting communication using ISDN is appropriately performed.

FIG. 16 shows an example of a configuration in which the media multiplexing modem device 1 is applied to a group 4 facsimile device using ISDN as a transmission path.
In the figure, the same parts as those in FIG. 11 and corresponding parts are designated by the same reference numerals.

In the figure, the system control section 71 performs control processing of each section of the group 4 facsimile apparatus and facsimile transmission control procedure processing.
The system memory 72 stores a control processing program executed by the system control unit 71, various data necessary for executing the processing program, and the like, and constitutes a work area of the system control unit 71. The memory 73 is for storing various information unique to the group 3 facsimile apparatus, and the clock circuit 74 is for outputting current time information, calendar information and the like. You.

The scanner 75 is for reading an original image at a predetermined resolution, the plotter 76 is for recording and outputting an image at a predetermined resolution, and the image processing unit 77 is, for example, a resolution converter. The operation display unit 78 is for executing various image processing such as processing, and is for operating the facsimile apparatus, and includes various operation keys and various display devices.

The encoding / decoding unit 79 is for encoding and compressing the image signal and for decoding the encoded and compressed image information into the original image signal.
Is for storing a large number of coded and compressed image information.

The data for the group 3 facsimile communication is connected to the parallel data DP1 of the media multiplexing modem device 1 as general-purpose data.

The ISDN interface circuit 81 uses the ISDN
In addition to being connected to the DN, the signal processing function of the layer 1 of ISDN and the integration / separation function of the D channel signal and the two B channel signals are provided, and the D channel signal is connected to the D channel transmission control unit 82. Exchange and again
The signals of the two B channels are media multiplexing modem devices 1
I am interacting with.

The D channel transmission control unit 82 has a layer 2 signal processing function of the D channel and a call control processing function for connecting / disconnecting one or two B channels.

These system control unit 71, system memory 72, parameter memory 73, clock circuit 74, scanner 75, plotter 76, image processing unit 77, operation display unit 78, encoding / decoding unit 79, image storage device 80. , Media multiplexing modem device 1, ISDN interface 8
The 1 and D channel transmission control units 82 are connected to an internal bus (CPU bus) 83, and data is exchanged between these respective elements mainly by the internal bus 83.
Has been done through.

In this case, when the partner terminal has the group 4 facsimile function and the group 4 facsimile communication is performed, the full-duplex / half-duplex / LAP control unit 2 is used.
Set to full-duplex mode, PCM audio CODEC
5 is set to the through function.

Therefore, the media multiplexing modem device 1
Then, as the parallel data DP1, full duplex / half duplex / L
The data input to the AP control unit 2 is added to the PCM audio CODEC 5 via the through bus 4, and the PCM audio C
Transmission data TXD1 (or TXD
2) is output to the ISDN interface 81 and I
Sent to SDN.

The signal received from ISDN is IS
Received data RXD1 (or RXD2) is added to the media multiplexing modem device 1 from the DN interface 81. This received data RXD1 is PCM audio COD
It is input via the EC5, added to the full-duplex / half-duplex / LAP control unit 2 via the through bus 4, and output from the full-duplex / half-duplex / LAP control unit 2 as parallel data DP1.

When the partner terminal has a group 3 facsimile function and group 3 facsimile communication is performed, the full-duplex / half-duplex / LAP control section 2
Set to full-duplex mode, PCM audio CODEC 5 is set to CODEC function on.

Therefore, the media multiplexing modem device 1
Then, as the parallel data DP1, full duplex / half duplex / L
The data input to the AP control unit 2 is added to the PCM audio CODEC 5 via the through bus 4, and the PCM audio C
After being converted to the corresponding audio information by ODEC5,
ISDN as transmission data TXD1 (or TXD2)
It is output to the interface 81 and sent to the ISDN.

The signal received from ISDN is IS
Received data RXD1 (or RXD2) is added to the media multiplexing modem device 1 from the DN interface 81. This received data RXD1 is PCM audio COD
After being input to the EC5 and converted to the original data by the PCM voice CODEC5, the data is added to the full-duplex / half-duplex / LAP control unit 2 via the through bus 4 to perform full-duplex / half-duplex / LAP control. It is output from the unit 2 as parallel data DP1.

In this way, appropriate data communication is performed when the partner device is the group 4 facsimile device and the group 3 facsimile device. Note that the device function of the partner terminal can be determined by, for example, the "higher layer compatibility" information element included in the call setup message SETUP received at the time of an incoming call, or the partner terminal function information specified by the user at the time of calling. It can be set based on.

FIG. 17 shows an example of a videophone communication terminal device using ISDN as a transmission path. In the figure, the same parts as those in FIG. 11 and corresponding parts are designated by the same reference numerals.

In the figure, the system control section 85 controls the operation of each section of the videophone communication terminal device, and
The system memory 86 stores a control program executed by the system control unit 85 and various data necessary for executing the control program. In addition, it constitutes a work area of the system control unit 85, and the parameter memory 87 stores various information (for example, abbreviated dial information) peculiar to this videophone communication terminal device. The circuit 88 outputs current time information, calendar information and the like. The operation display unit 89 is for operating this videophone communication terminal device.

The voice input / output device 90 is for telephone communication, and its voice input / output signal is connected to the serial data DS1 of the media multiplexing modem device 1 as voice data via the voice CODEC 91.

The video camera device 92 is for taking an image on the user side of the videophone communication terminal device, and the video signal output from the video camera device 92 is input to the video signal input terminal of the video CODEC 93. In addition to being added, it is added to the moving image signal input end of the display control unit 94. The video camera control unit 95 is for controlling operations such as shooting on / off, zooming in / zooming out, and panning of the video camera device 92.

The video CODEC 93 converts the analog NTSC format moving image signal input from the video camera device 92 into corresponding digital data moving image data, converts the moving image data into predetermined CIF format moving image data, and further, TTC. Standard JT-H. In addition to encoding and compressing to form moving image information, the moving image information in the encoded and compressed state is converted into original CIF format moving image data, and the moving image data is converted into NTSC format moving image data. Then, the moving image data is converted from digital to analog and converted into a moving image signal in an analog NTSC format.
Further, the video CODEC 93 connects the moving image information to the serial data DS2 of the media multiplexing modem device 1.

The display control section 94 includes a video monitor device 96.
The display contents of the screen displayed on the screen are controlled by a command from the system control unit 85.
2 or the display screen information of the display screen information of the moving image signal input from the video CODEC 93 is formed, and the display screen of the video monitor device 96 is configured in a mode in which the display screen information is appropriately combined.

The ISDN interface circuit 97 is an IS
In addition to being connected to the DN, the signal processing function of the layer 1 of ISDN and the integration / separation function of the D channel signal and the two B channel signals are provided, and the D channel signal is connected to the D channel transmission control unit 98. Exchange and again
The signals of the two B channels are media multiplexing modem devices 1
I am interacting with.

The D channel transmission control section 98 has a D channel layer 2 signal processing function and a call control processing function for connecting / disconnecting one or two B channels.

The system control unit 85, system memory 86, parameter memory 87, clock circuit 88, operation display unit 89, audio input / output device 90, media multiplexing modem device 1, video CODEC 93, display control unit 94, video camera. The control unit 95, the ISDN interface 97, and the D channel transmission control unit 98 include an internal bus (CPU
Bus 99, and data is exchanged between these elements mainly via the internal bus 99.

With the above configuration, when the partner terminal is connected to the ISDN, the PCM voice CODEC 5 has the through function set and the ISDN interface 9
Exchange data with 7.

Therefore, the media multiplexing modem device 1
Then, the serial data DS1 and DS2 input to the media multiplexing / separating unit 3 are multiplexed as audio data and video (video) data, and the transmission multiplexed data output from the media multiplexing / separating unit 3 is It is added to the PCM audio CODEC 5 via the through bus 4. In this case, the PCM audio CODEC 5 outputs the input transmission multiplexed data as it is to the ISDN interface 64 as the transmission data TXD1 (or TXD2), and outputs it to the ISDN via the ISDN interface 64.

The signal received from ISDN is IS
Received data RXD1 (or RXD2) is added from the DN interface 64 to the media multiplexing modem device 1. This received data RXD1 is PCM audio COD
It is added as reception multiplexed data to the media multiplexing / separating unit 3 via the EC 5 and the through bus 4.

The media multiplexer / separator 3 separates the original audio data and video data from the input received multiplexed data, and outputs the serial data DS1 and DS, respectively.
Output as 2.

Thus, the media multiplexing modem device 1
And the videophone communication using ISDN is properly executed.

When the partner terminal is connected to the PSTN, the PCM voice CODEC 5 has the CODEC function ON and the ISDN interface 9
Exchange data with 7.

Therefore, the media multiplexing modem device 1
Then, the serial data DS1 and DS2 input to the media multiplexing / separating unit 3 are multiplexed as audio data and video (video) data, and the transmission multiplexed data output from the media multiplexing / separating unit 3 is It is added to the PCM audio CODEC 5 via the through bus 4. In this case, the PCM audio CODEC 5 converts the input transmission multiplexed data into a corresponding digital audio signal, outputs it as the transmission data TXD1 (or TXD2) to the ISDN interface 64, and sends it to the ISDN via the ISDN interface 64. It

The signal received from ISDN is IS
Received data RXD1 (or RXD2) is added from the DN interface 64 to the media multiplexing modem device 1. This received data RXD1 is PCM audio COD
It is converted to the original data signal by EC5 and the through bus 4
Is added to the media multiplexing / separating unit 3 as reception multiplexed data via.

The media multiplexing / separating unit 3 separates the original audio data and the video data from the input received multiplexed data, and outputs the serial data DS1 and DS, respectively.
Output as 2.

Thus, the media multiplexing modem device 1
By applying the above, the videophone communication is appropriately performed between the videophone communication terminal device connected to the ISDN and the videophone communication terminal device connected to the PSTN.

FIG. 18 shows an example of a video conference communication terminal device using ISDN as a transmission path. This video conference communication terminal device uses a basic interface of ISDN as a transmission path, and has a voice information communication function, a moving image information communication function, a still image information communication function, a facsimile communication function, a telewriting function, and Equipped with a multiplex communication function of these communication functions, and ISD
By connecting to N basic interfaces, data communication using two information channels (B channels) is possible.

In the figure, the system control unit 101
Control processing of each part of this video conference communication terminal device, processing of upper layer of video conference communication, execution processing of various application programs included in this video conference communication terminal device, and help corresponding to help request from user The system memory 102 executes various control processes such as a display process, and the system memory 102 stores a part of the control process program executed by the system control unit 101 and various data necessary for executing the control process program. In addition, it constitutes a work area of the system control unit 101, and the parameter memory 103 is for storing various data unique to the video conference communication terminal device.

The clock circuit 104 is for outputting the current date and time information, the scanner 105 is for reading and inputting an original image at a predetermined resolution, and the plotter 106 is for reading an image at a predetermined resolution. The encoder / decoder 107 is for recording and outputting, and the encoding / decoding unit 107 encodes and compresses the image signal read by the scanner 5 by the encoding method of the group 3/4 facsimile function, and also encodes the encoded image information. For decoding the image data into the original image signal, the image processing unit 108 executes various image processing such as image data scaling processing and resolution conversion processing, and the magnetic disk device 109 is a system. It is for storing software, a plurality of application programs, a large number of user data, and the like.

The liquid crystal display device 110 is used as a display device in the telewriting communication function, and
The touch panel device 111 is provided on the display screen of the liquid crystal display device 110, and is used as a display unit when the user operates the video conference communication terminal device. Is output. In addition, the liquid crystal display device 110
The touch panel device 111 also constitutes an operation display unit for operating the video conference communication terminal device.

The voice input / output device 113 is for voice communication, and its voice input / output signal is the voice CODEC 11
4 is connected to the serial data DS1 of the media multiplexing modem device 1 as voice data.

The video camera device 115 is for taking an image on the user side of the video conference communication terminal device, and the moving image signal output from the video camera device 115 is input to the image signal input terminal of the video CODEC 116. In addition to being added, it is added to the moving image signal input end of the display control unit 117.

The video CODEC 116 converts the analog NTSC format moving image signal input from the video camera device 115 into corresponding digital data moving image data, converts the moving image data into predetermined CIF format moving image data, and further, TTC. Standard JT-H. In addition to encoding and compressing to form moving image information, the moving image information in the encoded and compressed state is converted into original CIF format moving image data, and the moving image data is converted into NTSC format moving image data. Then, the moving image data is converted from digital to analog and converted into a moving image signal in an analog NTSC format. Further, the video CODEC 116 connects the moving image information to the serial data DS2 of the media multiplexing modem device 1.

The document camera device 118 is for taking a still image, and the analog NTSC signal (still image signal) output from the document camera device 118 is added to the still image CODEC 119.

The still image CODEC 119 performs analog / digital conversion on the still image signal applied from the document camera device 118, and then performs a predetermined encoding method (eg, JPEG).
System), and the compressed still image information is decoded into the original still image signal. The still image signal input from the document camera device 118 or the still image signal obtained by decoding Is output to the still image signal input terminal of the display control unit 117.

The display control unit 117 includes the video monitor device 1.
It controls the display contents of the screen displayed on 20,
Display screen information of a moving image signal input from the video camera device 115 or the video CODEC 116 and a still image CODEC1 according to a command from the system control unit 101.
The display screen of the video monitor device 120 is configured in such a manner that the display screen information of the still image signal added from 19 is formed and the display screen information is appropriately combined.

The ISDN interface circuit 121 uses the I
In addition to being connected to the SDN, the ISDN layer 1 signal processing function and the integration / separation function of the D channel signal and the two B channel signals are provided, and the D channel signal is connected to the D channel transmission control unit 122. Also, the two B channel signals are exchanged with the media multiplexing modem device 1.

The D channel transmission control section 122 has a D channel layer 2 signal processing function and a call control processing function for connecting / disconnecting one or two B channels.

These system control unit 101, system memory 102, parameter memory 103, and clock circuit 10
4, a scanner 105, a plotter 106, an encoding / decoding unit 107, an image processing unit 108, a magnetic disk device 109,
Liquid crystal display 110, touch panel device 111, audio input / output device 113, audio CODEC 114, video camera device 115, video CODEC 116, display control unit 11
7, document camera device 118, still image CODEC 119,
The ISDN interface 121, the D-channel transmission control unit 122, and the media multiplexing modem device 1 are connected to an internal bus (CPU bus) 123, and the exchange of data between these respective elements is mainly performed by the internal bus 1.
23.

Data relating to telewriting communication is exchanged with the media multiplexing modem device 1 as serial data DS3, and still image data or facsimile communication data is parallel data DP1.
Is exchanged with the media multiplexing modem device 1.

With the above configuration, when the communication partner terminal is connected to the ISDN, the media multiplexing modem device 1
Then, the full-duplex / half-duplex / LAP control unit 2 is set to full-duplex and LAP-on mode, its line side is connected to the media multiplexing / separation unit 3 as general-purpose data DP2, and PCM The audio CODEC 5 is set to the through function. As a result, the parallel data DP1 input to the media multiplexing modem device 1 is converted into data having a frame structure according to LAP, and is added to the media multiplexing / separating unit 3 as general-purpose data DP2.

Therefore, the serial data DS1, DS2, DS3 and the general-purpose data DP2 input to the media multiplexer / separator 3 are multiplexed as audio data, video (video) data, and two general-purpose data. The transmission multiplexed data output from the media multiplexing / demultiplexing unit 3 is transmitted via the through bus 4 to the PCM audio CODE.
Added to C5. In this case, PCM voice CODEC5
Indicates that the PCM audio CODEC 5 has the input transmission multiplexed data as it is as the transmission data TXD1 and TXD2.
It is output to the DN interface 64, so that the transmission multiplexed data is transmitted via the ISDN interface 64.
Sent to ISDN.

The signal received from ISDN is IS
Received data RXD1, RX from the DN interface 64
It is added to the media multiplexing modem device 1 as D2.
The received data RXD1 and RXD2 are PCM audio CO
It is added as reception multiplexed data to the media multiplexer / separator 3 via the DEC 5 and further via the through bus 4.

The media multiplexing / separating unit 3 receives the original audio data, video data,
And two general-purpose data are separated, and serial data DS1, DS2, DS3 and general-purpose data DP2 are respectively separated.
And the general-purpose data DP2 is full-duplex / half-duplex /
It is added to the LAP control unit 2.

In this case, since the LAP on mode is set, the full-duplex / half-duplex / LAP control section 2
Based on the received data, error detection according to LAP is performed.

At this time, if an error is detected, a retransmission procedure on the LAP is executed for error recovery. Therefore, the full-duplex / half-duplex / LAP control unit 2 executes the operation of retransmitting the data requested for retransmission when the retransmission procedure on the LAP is started from the partner terminal. Also,
When no error is detected, the received data is output from the full-duplex / half-duplex / LAP control unit 2 as parallel data DP1.

Here, since the retransmission operation by the full-duplex / half-duplex / LAP control unit 2 is executed in parallel independently of other communication control processing, for example, still image data or facsimile communication is performed. Data can be exchanged with the other terminal without error.

Thus, the media multiplexing modem device 1
And the video conference communication using ISDN is appropriately executed.

When the communication partner terminal is connected to the PSTN, in the media multiplexing modem device 1, the line side of the media multiplexing / separating unit 3 is connected to the data modem 7 and full duplex / half duplex. The duplex / LAP control unit 2 is set to the full-duplex and LAP on mode, its line side is connected to the media multiplexing / separating unit 3 as general-purpose data DP2, and the PCM voice CODEC 5 is turned on. Is set and the line side of PCM voice CODEC5 is I
The data modem 7 is connected to the SDN interface 121, and the line side of the data modem 7 is connected to the through bus 4.

Accordingly, the media multiplexing modem device 1
The parallel data DP1 input to is converted into frame-structured data according to LAP, and is added to the media multiplexing / separation unit 3 as general-purpose data DP2.

Therefore, the serial data DS1, DS2, DS3 and the general-purpose data DP2 input to the media multiplexer / separator 3 are multiplexed as audio data, video (video) data, and two general-purpose data. The transmission multiplexed data output from the media multiplexing / demultiplexing unit 3 is data-modulated by the data modem 7 by the modem function set at that time, and then the through bus 4
Is added to the PCM voice CODEC 5 via the. PCM
The voice CODEC 5 converts the input data-modulated transmission multiplexed data into the corresponding voice data and outputs it as the transmission data TXD1 (or TXD2) to the ISDN interface 64, whereby the transmission multiplexed data is
It is sent to the ISDN via the ISDN interface 64.

The signal received from ISDN is IS
Received data RXD1 (or RXD2) is added from the DN interface 64 to the media multiplexing modem device 1. This received data RXD1 is PCM audio COD
The data is converted into a corresponding data signal by the EC5, added to the data modem 7 via the through bus 4, demodulated, and then added to the media multiplexing / separating unit 3 as reception multiplexed data.

The media multiplexing / separating unit 3 receives the original audio data, video data,
And two general-purpose data are separated, and serial data DS1, DS2, DS3 and general-purpose data DP2 are respectively separated.
And the general-purpose data DP2 is full-duplex / half-duplex /
It is added to the LAP control unit 2.

In this case, since the LAP on mode is set, the full-duplex / half-duplex / LAP control section 2
Based on the received data, error detection and a retransmission request are made according to LAP, which enables error-free data transmission on this general-purpose data channel.

At this time, the media multiplexing / separating unit 3
Since the frame format of the reception multiplexed data has a mode according to the modem speed of the data modem 7 as described above, only the effective portion of the data is extracted from the reception multiplexed data frame and treated as the reception data. .

In this way, the video conference communication can be appropriately performed between the video conference communication terminal device connected to the ISDN and the video conference communication terminal device connected to the PSTN.

In the above embodiments, the case where a maximum of two information channels are used has been described, but the basic technical idea of the present invention can be applied to a case where three or more information channels are used. You can

Further, in the above-mentioned embodiment, audio data, video data, and general-purpose data are applied as the media to be multiplexed, but other media (for example, management information having a strong real-time property) are used. The present invention can be similarly applied to the case of multiplexing.

Further, the media multiplexing modem device according to the present invention can be used as a data communication means in an appropriate device other than the device according to the above-mentioned embodiment, especially in a personal computer device. It is possible to provide higher-performance data communication with an inexpensive device configuration.

[0179]

As described above, according to the present invention,
Since all the functions required for media multiplexed data communication are incorporated into one media multiplex modem device, the same media multiplex modem device can be applied to various data communication devices, and the versatility is high and the mass production effect is high. Since it can be expected, equipment cost can be reduced, and as a result, IS
The data transmission means applicable to both DN and PSTN can be provided at an extremely low cost.

Since both the means for data communication with the terminal connected to the ISDN and the means for data communication with the terminal connected to the PSTN are both provided, the terminal connected to the ISDN and the PSTN are connected. There is also an effect that data communication can be mutually performed with the established terminal, the availability of the data communication service is improved, and it can contribute to the expansion of the data communication market.

When a data modem is used,
Since data communication in frame synchronous mode is possible, PS
There is also an effect that media multiplex communication can be easily performed by the data terminal device connected to the TN.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a media multiplexing modem device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a multi-frame format.

FIG. 3 is a schematic diagram showing an example of a frame format.

FIG. 4 is a schematic diagram showing an example of a frame synchronization signal.

FIG. 5 is a schematic diagram showing an example of a bit rate allocation signal.

FIG. 6 is a schematic diagram showing an example of a data transmission order.

FIG. 7 shows the data transmission rate of the data modem of 14400b.
FIG. 3 is a schematic diagram showing an example of a frame configuration when set to ps.

FIG. 8 shows a data transmission speed of a data modem of 19200b.
FIG. 3 is a schematic diagram showing an example of a frame configuration when set to ps.

FIG. 9 shows a data transmission speed of a data modem of 28800b.
FIG. 3 is a schematic diagram showing an example of a frame configuration when set to ps.

FIG. 10 is a P diagram when the media multiplexing modem device is applied to a data communication terminal device using PSTN as a transmission path.
The block diagram which showed an example of the connection with STN.

FIG. 11 is a diagram of I when the media multiplexing modem device is applied to a data communication terminal device using ISDN as a transmission path.
The block diagram which showed an example of the connection with SDN.

FIG. 12 is a block diagram showing a configuration example when a media multiplexing modem device is applied to a telewriting communication terminal device using PSTN as a transmission path.

FIG. 13 is a block diagram showing an example of a configuration when a media multiplexing modem device is applied to a group 3 facsimile device that uses PSTN as a transmission path.

FIG. 14 is a block diagram showing an example of a videophone communication terminal device using PSTN as a transmission path.

FIG. 15 is a block diagram showing a configuration example when a media multiplexing modem device is applied to a telewriting communication terminal device using ISDN as a transmission path.

FIG. 16 is a block diagram showing an example of a configuration when a media multiplexing modem device is applied to a group 4 facsimile device that uses ISDN as a transmission path.

FIG. 17 is a block diagram showing an example of a videophone communication terminal device using ISDN as a transmission path.

FIG. 18 is a block diagram showing an example of a video conference communication terminal device using ISDN as a transmission path.

[Explanation of symbols]

 1 Media Multiplexing Modem Device 2 Full Duplex / Half Duplex / LAP Control Unit 3 Media Multiplexing / Demultiplexing Unit 4 Through Bus 5 PCM Voice CODEC 6 ECM Bus 7 Data Modem 8 Analog Input / Output Unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 7/15

Claims (5)

[Claims] 1. Full-duplex modem means for converting transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and an audio signal via a digital transmission path PCM voice for converting the transmission / reception signal on the digital transmission line into a corresponding digital signal when exchanging data and for inputting / outputting the transmission / reception signal on the transmission line when exchanging a data signal through the digital transmission line or the analog transmission line. Specified link access protocol between the CODEC means and the other terminal When performing data transmission using a control function, the media multiplexing modem apparatus comprising the link access protocol control means for executing the link access protocol control function. 2. A full-duplex modem means for converting transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and an audio signal via a digital transmission path PCM voice CODEC means for mutually converting the transmission / reception signal on the digital transmission line into a corresponding digital signal when exchanging data and inputting / outputting the transmission / reception signal on the digital transmission line when exchanging a data signal via the digital transmission line. , Use a predetermined link access protocol control function with the other terminal Provided with link access protocol control means for executing the link access protocol control function, and when performing media multiplexed data transmission via an analog transmission line, the line side data of the media multiplexing / separation means is provided. A media multiplexing modem device characterized in that input and output are connected to said full-duplex modem means. 3. Full-duplex modem means for converting transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and an audio signal via a digital transmission path PCM voice for converting the transmission / reception signal on the digital transmission line into a corresponding digital signal when exchanging data and for inputting / outputting the transmission / reception signal on the transmission line when exchanging a data signal through the digital transmission line or the analog transmission line. Specified link access protocol between the CODEC means and the other terminal When performing data transmission using the control function, it is equipped with link access protocol control means for performing the link access protocol control function, and when transmitting data through an analog transmission line, the line side data of the link access protocol control means is provided. A media multiplexing modem device characterized in that input and output are connected to said full-duplex modem means. 4. A full-duplex modem means for converting transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and a voice signal via a digital transmission line PCM voice for converting the transmission / reception signal on the digital transmission line into a corresponding digital signal when exchanging data and for inputting / outputting the transmission / reception signal on the transmission line when exchanging a data signal through the digital transmission line or the analog transmission line. Specified link access protocol between the CODEC means and the other terminal When performing data transmission using the control function, a link access protocol control means for performing the link access protocol control function is provided, and when performing media multiplexed data transmission via a digital transmission path, the media multiplexing / separation means is used. A media multiplex modem device characterized in that the line side data input / output of is connected to the PCM voice CODEC means. 5. A full-duplex modem means for converting transmission / reception digital data into transmission / reception analog data by a predetermined modulation / demodulation method, and analog input / output means for connecting the full-duplex modem means to an analog transmission line. Media multiplexing / separating means for multiplexing a plurality of media information to form multiplexed transmission digital data and separating the received multiplexed reception digital data into a plurality of media information, and an audio signal via a digital transmission path PCM voice for converting the transmission / reception signal on the digital transmission line into a corresponding digital signal when exchanging data and for inputting / outputting the transmission / reception signal on the transmission line when exchanging a data signal through the digital transmission line or the analog transmission line. Specified link access protocol between the CODEC means and the other terminal When the data transmission using the control function is executed, the link access protocol control means for executing the link access protocol control function is provided, and when the data is transmitted through the digital transmission line, the line side data of the link access protocol control means is provided. A media multiplexing modem device characterized in that the input and output are connected to the PCM voice CODEC means.