KR920008762B1 - ISDN Teleting Terminal System - Google Patents

Abstract

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Description

ISDN Teleting Terminal System

1 is a functional block diagram of a conventional ISDN telephone.

2 is a functional block diagram of one embodiment of an ISDN teleting terminal of the present invention with a teleting terminal and an ISDN telephone connected.

3 is a flow chart for explaining the operation of the writing codec unit and the control unit.

4 is a flowchart illustrating a process of transmitting telling information according to the present invention.

5 is a flowchart illustrating a process of receiving telling data according to the present invention.

* Explanation of symbols for the main parts of the drawings

20: fill input device 21: screen display unit

22: printing unit 23: the paint codec unit and control unit

24: I / O interface unit for telling

The present invention relates to an ISDN telephony terminal system capable of communicating a handwriting information with a voice call on an integrated services digital netwok (ISDN) by connecting handwriting information to an existing ISDN telephone.

In general, the teleting terminal is a terminal capable of communicating a handwriting information such as a picture, a text, and a figure that the user has made with a voice call through a telephone line. The communication method of the handwriting information of the terminal is to remove the part of the voice band (1500-200Hz), insert the handwriting information, polymerize it with the voice signal, and transmit it in a half-duplex manner. Due to this, there is a problem that the quality of voice calls is extremely degraded.

Accordingly, an object of the present invention is to provide a voice through one B channel of an ISDN telephone of a 2B + D channel (B: 64 Kbps, D: 16 Kbps), which is a basic access channel provided to a user by ISDN in order to solve the aforementioned problems of the prior art. The present invention provides a system for making a call and communicating filing information through a D channel.

The ISDN teleting terminal system provided according to the present invention is a ISDN terminal and a handwriting input device for inputting handwriting information such as pictures, texts, and figures, a screen display unit for displaying the received handwriting information, and prints the received handwriting information. A print coder and a control unit connected to the print input unit, the screen display unit, and the print unit for encoding and decoding the handwriting information, and between the print codec unit and the control unit and the system control unit. It includes an input / output interface for telling to perform the interface function of the.

The invention will now be described in more detail with reference to the accompanying drawings and using the preferred embodiments.

1 is a block diagram showing the overall configuration of a conventional ISDN telephone, which includes a handset 1, a keypad 2, a display device 3, an input / output interface 4, an audio interface 5, and a B. FIG. It consists of the channel control part 6, the line interface part 7, the data link control part 8, and the system control part 9.

Here, the handset 1, the keypad and the display device 3 are connected to the input / output interface 7, the handset 1 has a microphone and a speaker for inputting and outputting voice, and the keypad 2 Denotes an input device for dialing numbers, and the display device 3 is an output device for displaying a screen of a dialing number or displaying a screen of a counterpart phone number. The input / output interface unit 4 is connected to the handset 1, the keypad 2, the display device 3, the audio interface unit 5, and the system control unit 9 so that the handset 1 and the keypad 2 and The display device 3 performs a connection function between the outside and the ISDN telephone.

In addition, the audio interface unit 5 is connected to the input / output interface unit 4, the B channel control unit 6 and the system control unit 9, and the analog voice input from the handset 1 through the input / output interface unit 4. The signal is converted into a digital signal, encoded, and then transmitted to the B channel controller 6, or the digital signal transmitted from the B channel controller 6 is decoded, converted into an analog signal, and output through the handset 1 It has a function of delivering to the interface unit 4, and also generates various tones required for the telephone.

The B channel control unit 6 is connected to an audio interface unit 5, a line interface unit 7, and a system control unit 9, and is composed of a B1 and B2 channel selector and a B1 and B2 channel switch. In the signal input / output operation with the line interface unit 7, the B channel switching function and the B1 and B2 channel allocation functions are performed.

The line interface unit 7 is connected to the B channel control unit 6 and the data link control unit 8, and is configured with a 'S' frame configuration function, an activation / deactivation processing function, a 100% AM1 code processing function, It performs DPLL function, frame rearrangement and recovery function for clock recovery.

The data link control unit 8 is connected to the line interface unit 7 and the system control unit 9, and is composed of a D-channel controller and a LAPD controller to detect and generate flags, insert and remove zeros. It performs functions such as FCS (Frame Check Sequence) processing for error detection, D channel priority control and address check.

The system control unit 9 is connected to the input / output interface unit 4, the audio interface unit 5, the B channel control unit 6, and the data link control unit 8 to perform overall functions of controlling all functional units of the ISDN telephone. .

FIG. 2 shows a block diagram of an ISDN telephoning terminal constructed by connecting to the ISDN telephone and the telling terminal of FIG.

Here, the handset 11, the keypad 12, the display device 13, the input / output interface unit 14, the audio interface unit 15, the B channel control unit 16, the line interface unit 17, and the data link control unit ( In order to connect the ISDN telephony terminal to the ISDN telephone constituted by 18) and the system controller 19, the control program of the system controller 19 must be changed and a telewriting input / output interface 24 must be added.

The telecommunication input / output interface unit 24 is connected to the fill codec unit and control unit 23 and the system control unit 19 of the ISDN telephone to communicate the fill information with RS-232C. At this time, RS-232C connection port uses asynchronous communication port 1 (COM1 port), and it is transmitted and received by 9600bps, 1 stop bit, 8bit data, no parity method.

Now, the operation of the ISDN terminating terminal will be described. After the voice call is established with the ISDN telephone, the handwriting information such as pictures, texts, and figures created by the user using the handwriting input device 20 is inputted to the handwriting codec unit and the control unit 23, encoded, and simultaneously displayed on the screen display unit 21. Appears in the The fill codec unit and the control unit 23 process the encoded fill information into a predetermined form and transfer the encoded fill information to the system control unit 19 through the telling input / output interface unit 24 to transmit the data link control unit 18 and the line interface 17. ) Is transmitted through the 16Kbps D channel.

Meanwhile, the fill information having the HDLC frame structure transmitted through the line interface unit 17 and the data link control unit 18 is transmitted from the system control unit 19 to the telling input / output interface unit 24. The transmitted writing information is decoded by the writing codec unit and the control unit 23 to be displayed on the screen display unit 21. In addition, the printing unit 22 is driven by the printing function selection of the writing input device 20 while the transmission and reception of the writing information is completed, so that the information displayed on the display device 21 is printed.

The fill input device 20 may be a tablet that generates x and y coordinates according to the movement of a commercial pen, and a fill codec unit using an asynchronous communication port (COM2 port) through RS-232C. It is connected to the control unit 23. The screen display unit 21 may be a monochrome monitor of a general personal computer, and the printing unit 22 may be a dot matrix printer.

At this time, the function performed by changing the control program of the system control unit 19 is as follows. 4 illustrates a process in which the telling information processed by the fill codec unit and the controller 23 is transmitted to the counterpart. The telemetry data encoded by the fill codec unit and the control unit 23 and transmitted to the input / output interface unit 24 for telling by the fill input unit 20 is recognized by the system control unit 19 to recognize the data link control unit ( In 17), the information is converted into an information frame by the LAPD control function. The changed information frame is transmitted to the D channel of the 'S' interface through the line interface unit 16 and transmitted to the counterpart.

5 illustrates a process of receiving telemetric data transmitted from the other party. The D channel data received from the line interface 17 is received by the data link control unit 18 in an information frame. The received information frame is checked by the system control unit 19 to determine whether it is a telling information frame, and then separates the telling data from the telling information frame and transmits it to the telling input / output interface unit 24. Thereafter, the received telling data is decoded by the fill codec unit and the controller 23 to be displayed on the screen display unit 21.

3 is a flowchart illustrating the operation of the fill codec unit and the control unit. In this figure, when the call with the other party is established by the ISDN telephone, the screen of the telewriting terminal is switched to a screen for selecting a function required by the user on the initial screen.

In this case, the communication of the handwriting information may transmit the handwriting information when the user who wants to transmit the handwriting information selects a transmission request function and then responds at the receiving end. At this time, the handwriting information output from the handwriting input device is encoded and displayed on the screen using CCITT and code and method. To be displayed on the screen display. The transmission of the writing information is effective until the user selects the transmission end function. After the user of the transmission side selects the transmission end function, the reception side user can transmit the transmission information by making a transmission request.

The next time the end-of-send function is selected and the handwriting information is not sent to the other party, the screen displayed on the screen display can be printed by selecting the print function. If the user hooks up and ends the voice call, the user returns to the initial screen and waits until the next call is established.

When ISDN services become commercially available in the future, inevitably, ISDN phones that provide voice calls over ISDN will generally be available to the public. In this case, if the telephony terminal is connected to the ISDN telephone as in the present invention, it is possible to solve problems such as deterioration of voice call quality generated in the existing telephone network.

Claims (2)

Handset 11, number dialing keypad 12, display means for screen display of dialing number or screen display of counterpart phone number 13, input / output interface means 14 connected to the handset and keypad and display means, the input / output The audio interface means 15 connected to the interface means for converting and inputting an analog voice signal into a digital signal, encoding or decoding the input digital signal, converting the analog signal into an analog signal, and outputting the same; B channel control means 16 connected to the interface means 15 and performing the B channel switching function and the B1 and B2 channel assignment functions, the B channel control means 16 to perform the B channel assignment function, and the B channel. Line connected to control means to perform frame configuration, start / stop processing, AM1 code processing, clock recovery, frame rearrangement and recovery functions A data link control means 18 connected to the interface means 17 and the line interface means for performing functions such as flag detection and generation, zero insertion and removal, error detection, D-channel priority control and address checking, It is connected to an ISDN telephone having system control means 19 connected to the input / output interface means, the audio interface means, the B channel control means, and the data link control means to collectively control all the functional units, to transmit and receive the fill information along with the voice call. An ISDN telling terminal system, comprising: a fill input means (20) for inputting fill information; Screen display means (21) for displaying the received fill information; Printing means 22 for printing the received fill information; It is connected to said fill input means, screen display means, and printing means, and transmits the information received from said fill input means 20 into telling data that can be recognized by system control means 19 of said ISDN telephone. A decoded codec and control means (23) for decoding the received telling data and outputting the decoded data to the screen display means (21) or the print means (22); And telecommunication input / output interface means (24) connected to the fidelity codec and control means and the system control means (19) of the ISDN telephone to perform an interface function therebetween; ISDN teletelling terminal system characterized in that it comprises a. 2. A channel according to claim 1, wherein one of the B channels of the basic access channel (2B + D) of the ISDN telephone is used for the voice call in order to communicate the filing information through the telewriting interface means 24. ISDN telephony terminal system, characterized in that configured to communicate filing information by using.

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