KR900002775B1 - Automatic call signal processing method and an apparatus in a modem - Google Patents

Abstract

The apparatus includes a latch (20) transmitting data as hook relay control tone/ring enable signal, and tone data from a microcomputer, a multi frequency generator (40) generating the multi frequency signal according to output signal of a first terminal (23), a modem IC (60) checking tone signal and transmitting it to the microcomputer (60) through a third data bus according to the control signal from a second strobe signal terminal (ST2), a ring detector (70) detecting ring signal from an antenna, a voltage adder (80) adding and transmitting the signals from the multi frequency generator and carrier signal of modem, and a duplexer (900) protecting antenna network.

Description

Modem automatic call signal processing device and method

1 is a general manual and automatic call schematic.

2 is a circuit diagram according to the present invention.

3 is a flow chart according to the present invention.

* Explanation of symbols for main parts of the drawings

10: microcomputer 20: latch circuit

30: serial communication interface circuit 40: complex frequency generating circuit

50: modem integrated circuit 60: tone detection circuit

70: ring detection circuit 80: voltage addition circuit

90: duplexer circuit OP1-OP2: operational amplifier

Rl-R3: Resistor VR1-VR2: Variable Resistor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automatic call signal processing of a modem by a program control method. In particular, a device configuration is simple and can be easily controlled by a software to be applied to a dial up modem. The present invention relates to a modem automatic call signal processing device and a method which is easy to operate and which can fully automate all call signal processing and perform the functions of an intelligent modem.

In general, the most important data communication system is a data transmission device, and the most commonly used device is a modem, that is, a modulator.

The modem transmits data through the analog transmission medium. It is an essential device that modulates the digital signal used in the computer or terminal to the analog transmission line for transmission, receives the modulated signal, and then demodulates the original digital signal. It is a kind of signal converter that converts signals.

Therefore, when a computer or a terminal wants to transmit data through another switching line by using this method, there is a method of calling a counterpart by using manual dialing and a calling method by automatic dialing as shown in FIG.

As in the latter case, the call by automatic dialing should have an Automatic Calling Unit (ACU).

The basic function of an automatic pager is to dial and call the computer or terminal automatically instead of people. The actual dialing process is no different than a person dialing. For example, all of the following processes are performed electronically. In other words, the user picks up the handset electronically, checks the dial tone, dials each telephone number, waits until the called party answers, and then connects when the answer is made. If you are busy or there is no response from the caller for a while, dial again.

After use, return the handset to its original position. Automated pagers in data communications networks significantly increase line utilization.

The most common use of an automatic pager is a distributed network, one of which can be easily exemplified in the case of periodic polling of computers or several terminals in different provinces is in the insurance sector. Most large insurance companies have offices scattered around the country. Offices scattered throughout the country handle insurance business, and each office has a terminal, and the necessary information is entered into the terminal's auxiliary storage device. When the day is over and the time is low, the computer will use the automatic pager to each office in the country to read the contents stored in the terminal. After collecting all the data from the nationwide office, the necessary measures are sent back to the terminal of the nationwide office using an automatic pager.

When employees in each office go to work in the morning, new instructions or necessary actions are posted in the terminal, allowing them to perform the day's work. In such a system, the automatic pager can not only handle the work without human intervention, but also reduce the cost of the track by using the track in the evening with low rates. Interestingly, there are no new subscribers at all, so terminals that are not reported do not respond to an automatic call, thereby avoiding unnecessary call charges. Similar uses are available and you will feel the convenience of an automatic pager.

There are two types of pagers, just as there are dials and buttons on phones.

Accordingly, it was necessary to select a switch type (electronic or mechanical) so that the dial pulse method and the MFC method could be used separately.

In addition, in case of the conventional dial-up modem, it is inconvenient to use because the user dials the modem of the other party using the telephone attached to the modem and checks the response tone or the carrier signal one by one and switches the data communication mode directly by the toggle switch. There was this.

Accordingly, an object of the present invention is to provide a circuit that can be easily all-automatic of the dial-up modem by using a simple circuit and a microprocessor in performing call signal processing, and is easy to diversify functions and convert according to modes.

Another object of the present invention is to provide a method for automatically recognizing an exchange type regardless of an exchange type, and sending out an MFC and a dial pulse to process a call.

It is still another object of the present invention to provide a method for easily changing the function and improving the processing speed because it is processed by software.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

단(15), 클리어 투 센드

단(16), 콘트롤/데이타(C/D)단(17)이 연결되고 상기 래치회로(20)의 제 2출력단(24)이 링입력단(R1)에 연결되어 송수신 신호를 변복조하여 출력하는 모뎀 집적회로(50)와, 상기 마이크로 컴퓨터(10)의 제어버스에 제 2스트로브 신호단(ST2)이 연결되며 제 3데이타 버스(13)과 다이얼톤(DT)과 화중음(BT)단에 연결되어 상기 제 2스트로브 신호단(ST2)의 제어신호에 따라 입력되는 톤 신호를 체크하여 제 3데이타 버스(13)를 통해 마이크로 컴퓨터(10)로 출력하는 톤 감지회로(60)와, 상기 마이크로 컴퓨터(10)의 제어버스에 제 3스트로브신호단(ST3)이 연결되고 상기 제 3 데이타 버스(13)에 링통(RT)단이 연결되어 공증선(R, T)에서 전송라인(71, 72)을 통해 입력되는 링신호를 감지하여 공급하는 링감지회로(70)와, 상기 복합주파수 발생회로(40)의 출력단(41)과 연결되고 상기 모뎀 집적회로(50)의 전송 캐리어(TC:Transmitted Carrier)단(51)이 연결되어 복합주파수(MFC)발생신호와 모뎀 전송캐리어 신호를 중첩하여 출력하는 전압가산회로(80)와, 상기 전압가산회로(80)의 출력단(81)과 연결되며 상기 모뎀 집적회로(50)의 수신 캐리어(RC : Received Carrier)단(52)에 연결되어 공중 네트워크를 보호할 수 있는 하이브리드로 구성(2W/4W)된 듀플렉셔 회로(90)와, 상기 듀플렉셔 회로(90)의 제 1라인(91)과 공중선(R)단 사이에 루우프 릴레이(100)을 접속하고 제 2라인(92)은 공중선(T)에 연결하여 상기 래치회로(20)의 출력 제어단(21)의 출력에 따라 상기 루우프 릴레이(100)가 스위칭되어 상대편 모뎀과 데이터를 송수신 할 수 있도록 구성된다.Figure 2 is a circuit diagram according to the present invention for embedding a MBR (Make Break Ratio) program and a message to the user for pulse dialing, and checks the detection of the ring signal from the user's dialing or the other party's modem, and check the carrier and process according to the program And a microcomputer 10 for controlling data transmission by automatic call processing by outputting a control signal, and a first strobe signal stage ST1 at a first data bus 11 and a control bus of the microcomputer 10. Hook) to latch the output data through the first data bus 11 of the microcomputer 10 according to a signal input to the first strobe signal stage ST1 to control the hook relay and the tone / ring enable and tone. A latch circuit 20 for outputting data and a second data bus 12 of the microcomputer 10 are asynchronously paired in series according to a handshake control signal. A serial communication interface circuit (USART) 30 for transmitting and receiving data between rooms and a first line 22 of the latch circuit 20 are connected to a tone enable end TE and the first circuit of the latch circuit 20 is connected. An output terminal 23 connected to the tone data terminal TD to generate a complex frequency MFC according to the signal of the first output terminal 23, and the serial communication interface circuit 30; Connected to the transmit (TXD) end 18 and the receive (RXD) end 19 from the data terminal ready (DTR) end 14

Stage (15), Clear to Send

A stage 16 is connected to a control / data (C / D) stage 17 and a second output terminal 24 of the latch circuit 20 is connected to a ring input terminal R1 to modulate and output a modulated transmit / receive signal. The second strobe signal stage ST2 is connected to the integrated circuit 50 and the control bus of the microcomputer 10, and is connected to the third data bus 13, the dial tone DT, and the chord tone BT stage. And a tone detection circuit 60 for checking the tone signal input according to the control signal of the second strobe signal stage ST2 and outputting the tone signal to the microcomputer 10 through the third data bus 13 and the microcomputer. A third strobe signal stage (ST3) is connected to the control bus of (10) and a ring barrel (RT) terminal is connected to the third data bus (13) to transmit lines (71, 72) on the notary lines (R, T). A ring sensing circuit 70 for detecting and supplying a ring signal input through the ring signal, and an output terminal 41 of the complex frequency generating circuit 40 and integrated with the modem Transmitted Carrier (TC) stage 51 of the circuit 50 is connected to the voltage addition circuit 80 for superimposing and outputting the combined frequency (MFC) generation signal and the modem transmission carrier signal, and the voltage addition circuit ( Duplex connected to the output terminal 81 of the 80 and connected to the receiving carrier (RC: Received Carrier) (52) of the modem integrated circuit 50 to protect the public network (2W / 4W) The loop relay 100 is connected between the lexer circuit 90 and the first line 91 of the duplexer circuit 90 and the aerial line R, and the second line 92 is connected to the aerial line T. Thus, the loop relay 100 is switched in accordance with the output of the output control terminal 21 of the latch circuit 20 to transmit and receive data with the other modem.

In the voltage adding circuit 80, which is not described above, the output terminal 41 of the complex frequency generating circuit 40 connects the resistor R1 to the inverting terminal (-) of the operational amplifier OP1 and the non-inverting terminal (+). The power supply (VCC) is supplied and the variable resistor (VR1) connected to the feedback resistor between the output terminal of the operational amplifier (OP1) and the resistor (R3) from the output terminal of the operational amplifier (OP1) by connecting the modem integrated circuit (50) The resistor R2 is connected to the connection node 82 from the transmission carrier (TC) terminal 51 of the terminal), and is connected to the inverting terminal (-) of the operational amplifier OP2, and the non-inverting terminal (+) is the power supply (VCC). Is supplied and is configured by connecting the variable resistor VR2 with a feedback resistor between the output terminals of the operational amplifier OP2.

3 is a flowchart according to the present invention.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3, when the power is initially supplied, the microcomputer 10 is initialized and the second data bus 12 is performed as in the process of FIG. 3 (3a). When the control signal is output through the serial communication interface circuit 30, the transmission carrier of the modem integrated circuit 50 is generated by turning on the DTR terminal 14 of the modem integrated circuit 50 and turning off the RTS terminal 15. Even if the voltage is not applied to the circuit 80, the data output from the microcomputer 10 is latched by the latch circuit 20 by the logic of the first strobe signal stage ST1.

At this time, the logic of the first line 22, which is the output end of the latch circuit 20, turns off the tone enable end TE of the complex frequency generating circuit 40 to disable the output control stage 21 of the latch circuit 20. The loop relay 100 is turned off by a logic such that a complex frequency is not output.

At this time, when the user dials to call the other party (3b), the microcomputer 10 checks whether there is a dial request and sets the T1 in the process (3e) so that the loop relay 100 can be turned on for a predetermined time (T1). do.

만큼 증폭되어 출력된다.At this time, when the microcomputer 10 outputs the dial tone data through the first data bus 11, the microcomputer 10 latches the signal according to the output of the first strobe signal stage ST1 and through the first line 22, the complex frequency generation circuit 40. Enable to generate a complex frequency and output dialing dial tone data through the first output terminal 23 to generate the corresponding dial frequency and input it to the inverting terminal (-) of the operational amplifier OP1 through the resistor R1. When the gain is adjusted by the variable resistor VR1, Vi (input signal) is output to the output terminal of the operational amplifier OP1.

Is amplified and output.

The tone detection circuit 60 detects a dial tone and a dial tone outputted through the resistor R3 and the microcomputer 10 checks in step 3f, and the tone is not detected in step 3f. In other words, during the time T1 set in the above step (3e), the user checks (3g) to display a dial tone message part (No Dial Tone Message) indicating that no dial tone is detected to the subscriber when the specified T1 time is exceeded. Output and transition to the initial standby state.

However, if the dial tone is detected within the time T1 specified in the step (3f), the first digit of the telephone number which is output from the microcomputer 10 and latched by the latch circuit 20 is converted into a complex frequency by the operational amplifiers OP1-OP2. After the amplification, the duplexer circuit 90 passes through the duplexer circuit 90 and is output to the exchanger along the aerial lines T and R.

Then, the predetermined time T2 is set in the process of 3k to check whether the exchanger to receive the first compound digit is electronic or mechanical. At this time, the duplexer circuit 90 transmits a tone to the exchanger that received the compound frequency. Send it out.

When the transmitter detects the transmission tone on the exchange side and detects that the transmission is stopped by the microcomputer 10 within the predetermined time T2, the latch circuit 20 latches the latched circuit 20 in step 3n. The frequency is continuously sent to the exchange side at the internal digit time in step 30 and the predetermined time T3 is set to detect whether the other party is busy when it is sent out in step 3p.

However, if the dial tone does not stop for a predetermined time (T2) for a predetermined time (T2) to check whether the exchanger is mechanical or electronic in steps (31) and (3m), the program of the MBR in the microcomputer 10 in the process (3g). Generates a pulse corresponding to the number dialed according to 33: 66 of the MBR rate, latches it in the latch circuit 20, and then controls the loop relay 100 on / off to control 33.3 at the end of the aerial line (T, R). A dial pulse signal is turned on for ms and off for 66.6 ms to the exchange.

That is, in the process of (3g), the first digit of the dial pulse is transmitted, but in the process of (3r), it is transmitted within the internal digit time, and in the process of (3s), it is checked that all the dial digits of the telephone number are all (3t). When the next digit is continuously sent out in the process and all are sent out, a predetermined time T3 is set in order to check at the exchange whether the other party is busy in the process (3m) as described above.

When the user checks the modem of the other party before the call and transmits the carrier, the exchange is input to the receiving carrier terminal RC of the modem integrated circuit 50 through the duplexer circuit 90 to demodulate the serial communication interface circuit 30. Through the microcomputer 10.

At this time, the carrier received from the microcomputer 10 is checked and the tone detection circuit 60 detects the tone and inputs it to the microcomputer 10 to check whether the reception carrier and the response tone are performed in step 3v. If there is no carrier and no answer tone, check the busy tone during (3w).

When not in the process of (3w), and during the time set in the process (3m) (T3) continues to check for a predetermined time elapses after the predetermined time to inform the user that there is no response in the process (4g) and latch circuit (20) The loop relay 100 is turned off in the process (4r) by the first transition.

However, when the call is negative during the process (3w), the user is informed that the user is on the line during the process (4k).

In operation 41, the waiting state may not continue, so the predetermined time T4 is set to set the time to turn off the loop relay 100.

In step (4m), check whether the automatic redial function is set, wait for a predetermined time (T4) during the automatic redial, and then redial while decreasing the dialed phone number digit in step (40). When the redial digit is zero, the feedback signal is fed back in step (3e), and the dial is resent according to the complex frequency and pulse.

However, if the microcomputer 10 checks that the carrier signal / response sound is detected by the modem integrated circuit 50 and the tone detection circuit 60 in step (3v), it is determined whether the carrier is continuously detected in step (3y). If there is no carrier continuously, the user is informed that the connection has failed in step 3z, and branched to step 4r, the relay loop 100 is cut and fed back for the first time, in step 3y. If there is a continuous carrier (4a) in step (4a) through the serial communication interface circuit 30 to turn on the request (RTS: Reguest To Send) (15) and whether the CTS (16) is on in step (4b) Check it.

If the CTS stage 16 is not activated in step (4b), the modem integrated circuit 50 notifies the user of the failure of the modem function in step 4c and cuts the loop.

When the CTS stage 16 is on, the transmission carrier TC of the modem integrated circuit 50 is transmitted through the operational amplifier OP2 through the duplexer circuit 90 to the other modem so that a link is formed (4d). In the process, the user informs the user of the connection with the host link, and checks the receiving carrier in the process (4e), switches to the data communication mode, and performs the data communication in the process (4j).

If the carrier reception signal of the other modem is interrupted in step (4e), the communication request is automatically interrupted by setting a predetermined time (T5). In step (4f), the carrier is set in step (4g). After stopping, check whether the predetermined time T5 has elapsed, and when the predetermined time T5 has elapsed, the host link failure message is sent to the user in step 4i. Then, the relay 100 is disconnected in step 4r, and the predetermined time is passed. When (T5) is the previous time, check the presence of carrier in (4h) and check the process (4g) again when there is no carrier and check the process (4e) again when there is a carrier to resume data communication.

In the answer mode, a ring signal arrives through the aerial lines T and R and is detected by the ring sensing circuit 70 to control the detected signal under the control of the third strobe stage ST3. Check at the microcomputer 10.

At this time, the microcomputer 10 controls the first strobe ST1 to latch the output data of the microcomputer 10 to turn on the loop relay 100, and through the second output terminal 24, the modem integrated circuit 50. A ring indicator (RI) is activated to generate a response carrier in the modem integrated circuit 50, amplify it in the operational amplifier OP2 through the resistor R2, and then pass the duplexer circuit 90 to the other modem. Send and detect the carrier which continues in the above-mentioned process (4e) and transmit and receive data in the process (4j) when the carrier continues, and check the predetermined time (T5) in the process (4g) when there is no carrier to check the host link connection failure message. Forward to user and turn off loop relay 100.

The above scheme may be changed somewhat depending on the state of the duplexer circuit 90, but it can be easily changed and modified by those skilled in the art.

As described above, the addition of a simple circuit and the call signal processing can be performed using a microprocessor, so that all operations of the dial modem can be automated, and there is an advantage in that the function can be diversified and changed easily.

Claims (3)

In the modem modem's automatic processing circuit, the MBR program and the message to the user are embedded for pulse dialing, the user's dialing or the detection of the ring signal from the other party's modem is checked, and the carrier is checked and processed according to the program. A microcomputer 10 for outputting and controlling data transmission by automatic call processing, and connecting the first strobe signal terminal ST1 to the first data bus 11 and the control bus of the microcomputer 10, The output data through the first data bus 11 of the microcomputer 10 is latched by a signal input through the first strobe signal stage ST1, and output as hook relay control, tone / ring enable, and tone data. It is connected to the latch circuit 20 and the second data bus 12 of the microcomputer 10 and asynchronous to the linear force according to the handshake control signal. The serial communication interface circuit 30 for transmitting and receiving the data and the first line 22 of the latch circuit 20 are connected to the tone enable terminal TE, and the first output terminal 23 of the latch circuit 20 is connected. A complex frequency generating circuit 40 connected to the tone data stage TA and generating a complex frequency MFC according to the signal of the first output terminal 23 according to the signal of the first output terminal 23; Connected to the transmit (TXD) stage 18 and the receive (RXD) stage 19 from the communication interface circuit 30, the data terminal ready (DTR) stage 14, the request to send (RTS) stage 15, clear A lusend (CTS) stage 16, a control / data (C / D) stage 17, a stage are connected, and a second output terminal 24 of the latch circuit 20-is connected to a ring indicator stage RI. And a modem integrated circuit 50 for modulating and outputting a transmitted / received signal and a second strobe signal terminal ST2 connected to a control bus of the microcomputer 10, and a third data bus 13 and a dial tone DT. Tone detection connected to the hwacheong (BT) stage and the tone signal input according to the control signal of the second strobe signal stage (ST2) and output to the microcomputer 10 through the third data bus 13 The third strobe signal stage ST3 is connected to the circuit 60 and the control bus of the microcomputer 10, and the ring tone RT stage is connected to the third data bus 13 to connect the aerial lines R and T. Is connected to the ring sensing circuit 70 for detecting a ring signal input through the transmission lines 71 and 72 and the output terminal 41 of the complex frequency generating circuit 40 and transmitting the modem integrated circuit 50. A carrier (TC) terminal 51 is connected to the voltage adding circuit 80 for overlapping and outputting the combined frequency (MFC) generating signal and the modem transmission carrier signal, and is connected to the output terminal 81 of the voltage adding circuit 80. It is connected to the receiving carrier (RC) terminal 52 of the modem integrated circuit 50 to protect the public network The loop relay 100 is connected between the duplexer circuit 900 composed of a bleed (2W / 4W) and the first line 91 of the duplexer circuit 900 and the aerial line R, and the second line is connected to the second line. 92 is connected to the aerial line (T), the loop relay 100 is switched in accordance with the output of the output control stage 21 of the latch circuit 20 is configured to transmit and receive data with the other modem Circuit. The voltage adding circuit (80) of claim 1, wherein an output terminal (41) of the complex frequency generating circuit (40) is connected to the inverting terminal (-) of the operational amplifier (OP1) through a resistor (R1). Positive voltage is supplied to the power supply VCC, and a variable resistor VR1, which is a feedback resistor, is connected between the output terminals of the operational amplifier OP1, and a variable resistor VR1, which is a feedback resistor, between the output terminals of the operational amplifier OP1. Is connected, and the resistor R3 is connected from the output terminal of the operational amplifier OP1, and the resistor R2 is connected to the connection node 82 from the transmission carrier TC terminal 51 of the modem integrated circuit 50. Connected to the inverting terminal (-) of the operational amplifier OP2, and the non-inverting terminal (+) is supplied with the power supply VCC and a variable resistor VR2, which is a feedback resistor, is connected between the output terminals of the operational amplifier OP2. Circuit configured. In the automated processing method, upon initializing the system, when the dialing request is requested, the loop relay detects a dial tone by turning on a predetermined time (3a, 3b, 3f) and (3f) of the first processes (3a, 3b, 3f). A second process (3g, 3i, 3j, 3k) of notifying the user that there is no dialtone message when the dialing tone is not detected and transmitting the first dial digit to the exchange at the complex frequency when the dialtone is detected; A third process (3l, 3m) which waits for a predetermined time a dial tone from the exchange to check whether the exchange receiving the first digit of the dial from the processes (3g, 3i, 3j, 3k) is electronic or mechanical, and the third process ( 31, 3m) in the fourth process (37 to 3p) of recognizing the electronic exchange when the exchange tone is off and transmitting the dial digits in the complex frequency from the next dial digit, and in the third process (31, 3m), exchange 5th process (3g ~ 3s) and the 4th, 5th process (3n ~ 3p, 3g) which recognizes with mechanical switch and generates pulse from the first digit dialed by the user when the dial tone is detected more than a predetermined time. 6s (3v) to detect the carrier and the response sound within a predetermined time from ~ 3s), and if there is no carrier or response sound from the sixth process (3v), the busy tone is checked for a predetermined time, indicating that the user has no response In the seventh process (3w, 3x, 4g, 4r) of outputting the message and cutting the loop relay, and (3w) of the seventh process (3w, 3x, 4g, 4r) when the busy call message to the user After transmitting and turning off the loop relay for a predetermined time, the automatic redial check is performed to redial the dialing digits (4k, 4l, 4m, 4o, 4p) and the sixth step (3v). If response tone is detected, there is continuous carrier A ninth process (3y, 3z, 4a to 4c) for transmitting a connection failure message to the user if there is no check and for turning on the RTS and checking the on state of the CTS when a continuous carrier is detected; and the ninth process (3y). 10c (4d) of (c) of 3z, 4a to 4c), when the S CTS informs the user that the modem has failed when the CTS is turned off, the user informs the user that the CTS is connected to the other modem, and checks the carrier which is continuously transmitted to the other modem (4d) , 4e), and in the tenth process (4d, 4e) (4e), if the continuous carrier is not checked for a predetermined time to inform the message that the connection with the other modem has failed, turn off the loop line and check the carrier continuously In the eleventh process (4f to 4h, 4i, 4r) of switching to the data communication mode to achieve data communication, and ring signal is detected instead of dial tone in (3b) of the first process (3a, 3b, 3f). Turn on the loop relay and ring the modem And a twelfth process (3c, 3d, 3h) of performing data communication according to the eleventh process (4f to 4h, 4i, 4r) by giving a signal that the signal is detected.

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