KR0170082B1 - Apparatus of transmitting/receiving dualized data automatically - Google Patents

Abstract

The present invention relates to an automatic redundant data transmission / reception apparatus capable of automatically transmitting and receiving data in different communication modes. It is connected to telephone line and detects incoming call of ring and outputs it. Forms call path In response to input of control signal, line interface or unit and tone-modulated analog signal are demodulated and output as digital signal. A first transmitter and receiver for modulating and outputting an analog signal, a second transmitter and receiver for demodulating and outputting a frequency shift-modulated analog signal to a digital signal and modulating and outputting the input of digital data to a predetermined control; And a control signal transmitter for selectively generating and outputting data transmission and termination signals, and forming a data path between the line interface unit and the first transmitter / receiver and sending the data path in response to an input of a mode switching signal. A communication mode switching unit for converting to negative and the call path type in response to the input of the ring detection signal; The control unit transmits and receives a sex control signal to the line interface unit, generates the corresponding signal by controlling the transmission and reception control unit, and outputs the mode change signal in response to the input of the mode change data input to the first transmission / reception device. And a control unit for transmitting and receiving data by controlling the second transmitting / receiving apparatus.

Description

Redundant Data Auto Transceiver

1 is a block diagram of an automatic data transmission and reception apparatus according to the prior art.

2 is a block diagram of an automatic data transmission and reception apparatus according to the present invention.

The present invention relates to an automatic data transmission and reception apparatus, and more particularly, to a redundant data automatic transmission and reception apparatus capable of automatically transmitting and receiving data in different communication modes.

Typically, an unmanned security system, for example, by using a telephone line, such as a dedicated line between the security terminal and the security control system for detecting an abnormal situation in the subscriber facility and transmitting the data to the security control system, Forming. The data transmission / reception apparatus of the security control system is configured to automatically receive data from a subscriber terminal, that is, a security terminal, and to automatically transmit response data corresponding to the received data. The security terminal has a function of analyzing information generated from various sensors and the like and automatically calling a security control system when an abnormality occurs in the analyzed result.

For example, the security terminal automatically executes a dialing to call the unmanned security control system when any abnormality is detected in the security target area by the sensor to form a data communication path with the data transmission / reception apparatus of the security control system. . When the data communication path is formed, the security terminal transmits the abnormal alarm data to the dual tone multi-frequency (DTMF). The data transmission / reception apparatus in the security control system converts and receives the duplication theory transmitted from the security terminal into digital data, and transmits the corresponding response data to the security terminal as the duplication theory.

The content of the data transmitted from the security terminal to the data transmission and reception apparatus in the security control system may be a message indicating an abnormal occurrence situation and a place where the occurrence occurs, and the data transmitted from the security control system to the security terminal may generate an alarm or release an alarm. It may be a message for controlling the state of the light. As shown in FIG. 1, the configuration of a data transmission / reception apparatus in a security control system that receives data transmitted in the form of DTMF from a security terminal and transmits response data as described above.

1 is a block diagram of a data automatic transmitting and receiving apparatus according to the prior art. In Fig. 1, reference numeral 10 denotes a line interface unit (hereinafter referred to as LIU), and has a function of matching signals with telephone lines L1 and L2 in response to an input of a call path forming control signal. This LIU10 is usually provided with a relay for connecting signals between telephone lines L1 and L2 and the internal system, which is driven by the input of a call path forming control signal, for example a relay drive signal. Reference numeral 12 denotes a DTMF receiver, which has a function of converting the received DTMF into digital digit data. The DTMF receiver 12 as described above can use a DTMF receiver or a DTMF decoder produced in one chip as it is. Reference numeral 14 is a control signal transmitter for transmitting a data transmission start signal (Kiss on signal) and a data transmission end signal (Kiss off signal) for the start of data to the security terminal by a predetermined control as a signal of about 1400 Hertz. Reference numeral 16 denotes a micro-processor (hereinafter referred to as a controller), which supplies a call forming control signal to the LIU10 in response to the detection of a ring signal, and simultaneously controls the control signal transmitter 14. Generate a data transmission start signal, analyze the state of the data output from the DTMF receiver 12 and control the control signal transmitter 14 when the correct data is generated to control the data transmission end signal to be generated to operate the data transmission / reception apparatus in the security control system. Has the function to control.

Although not shown in FIG. 1, a security terminal is connected through telephone lines L1, L2, and a public telephone network (PSTN). As described above, it should be noted that the security terminal has a function of monitoring an abnormal situation in the security area of the subscriber and transmitting corresponding data to the security control system.

First, the operation of the data transmission / reception apparatus of the conventional security control system will be described with reference to FIG.

Now, when an abnormal situation is detected in the subscriber's security area and the security terminal automatically dials to call the data transmission / reception apparatus in the security control system, the telephone ring signal is received on the telephone lines L1 and L2 shown in FIG.

A ring ring signal (not shown) incoming to the telephone lines L1 and L2 is detected and input to the controller 16. At this time, the controller 16 supplies a call forming control signal to the LIU 10 to connect the telephone lines L1 and L2 to the internal DTMF receiver 12 and the control signal transmitter 14. The controller 16 controls the control signal transmitter 14 to generate a data transmission start signal of 1400 Hz for about 2 seconds. At this time, the data transmission start signal is a message for notifying the security terminal to start data transmission.

The transmission start signal generated from the control signal transmitter 16 is transmitted to the security terminal which is the sender through the LIU 10 and the telephone lines L1 and L2. The security terminal recognizes that a data communication path between itself and the security control system has been formed in response to the data transmission start signal received continuously for about 2 seconds, and detects or transmits a certain type of message data corresponding to an abnormal situation in the subscriber area. Transmit as a signal. Data transmitted from the security terminal to the data transmission / reception apparatus of the security control system is transmitted in units of frames. Data transmitted as a signal of the DTMF as described above is input to the DTMF receiver 12 through the telephone lines L1, L2 and LIU10.

The DTMF receiver 12 decodes the received DTMF signal, converts it into digital data, and inputs the same to the controller 16. At this time, the controller 16 searches and determines the contents of the digital data output from the DTMF receiver 12, and controls the control signal transmitter 16 to transmit a data transmission end signal of 1400 Hz to the security terminal when the data is correct without errors. Then, the operation mode is switched to the standby mode waiting for the next signal. That is, it waits for data reception of the next frame. After that, if the data of the next frame is not received for a certain time, the controller determines whether a certain time has elapsed, and when a predetermined time elapses, the control unit automatically blocks the call formation control signal supplied to LIU 10 and automatically hooks off the telephone line. Restores the call path between security terminals.

In the above operation, if the DTMF signal received from the security terminal is not correct, the controller 16 does not transmit a data transmission end signal (Kiss off signal) to the security terminal side. At this time, the security terminal that transmits the transmission of the DTMF signal to the data transmission / reception apparatus on a frame-by-frame basis retransmits the DTMF signal if the data transmission end signal (Kiss off signal) is not received for a predetermined time.

However, in the conventional data transmitting and receiving apparatus having the configuration as shown in FIG. 1, since data is transmitted and received by using the DTMF method, the communication is not performed smoothly due to the failure of the communication network or the deterioration of the quality of the telephone line. If you try to make a call over a problem that can communicate with the security terminal. In addition, since data is transmitted and received using a DTMF signal, a transmission time per bit takes 100 ms or more, and thus, a very long time is required to transmit and receive data in a frame unit. In addition, there has been a problem of being easily affected by external noise by simply performing data communication in the analog form using only DTMF signals.

Accordingly, an object of the present invention is to provide a data transmission / reception apparatus of a security control system capable of communicating data with a security terminal at high speed.

Another object of the present invention is to provide a redundant data automatic transmission / reception apparatus capable of reducing data transmission error rate by transmitting data communication between a security terminal and a security control system and transmitting data at high speed.

Another object of the present invention is to provide a data transmission / reception apparatus capable of data communication between a security terminal and a security control system in a DTMF and FSK communication mode.

The present invention for achieving the above object is a line interface unit connected to the telephone line to detect and output the incoming ring and to form a call loop in response to the input of the call path forming control signal, and the tone-modulated analog signal Demodulate and output the digital signal, tone-modulate the digital data to output the analog signal, and output the frequency-modulated analog signal by demodulating the digital signal into a digital signal and frequency-shifting the input of the digital data. A second transmitter / receiver, a control signal transmitter for selectively generating and outputting data transmission and termination signals under predetermined control, and a data path between the line interface unit and the first transmitter / receiver and forming a mode switching signal; A communication mode switching unit for converting the data path to the second transmitting / receiving unit in response; In response to an input of a ring detection signal, the call path forming control signal is supplied to the line interface unit, and the control unit transmits and receives a control signal to generate a corresponding signal, and responds to input of mode switching data input to the first transmission / reception device. And a microprocessor configured to output the mode change signal and control the second transmitter / receiver to transmit and receive data.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings of the embodiments of the present invention, those having substantially the same configuration and function as those in the above-described drawings will use the same reference numerals.

2 is a block diagram of the automatic data transmission and reception apparatus according to the present invention. In this configuration, a communication mode switching unit 18 for switching a communication mode is connected to LIU 10 of the above-described configuration of FIG. 1, and the DTMF transmission / reception unit 20 capable of transmitting and receiving DTMF signals is connected to the communication mode switching unit 18. And a frequency shift keying (FSK) transmitter / receiver 22 are connected. The communication mode switch 18 connects the analog input / output ports of the DTMF transmitter / receiver 20 to the LIU 10, and responds to the analog signal of the FSK transmitter / receiver 22 in response to a mode change signal output from the controller 16 implemented as a microprocessor. Connect the port to the LIU 10. That is, the data path is switched to switch the data communication mode from the DTMF method to the FSK method. The DTMF transceiver 20 and the FSK transceiver 22 have a function of transmitting and receiving data under the control of a controller 16 implemented as a microprocessor. In this configuration, the FSK transmitter / receiver 22 includes an analog filter as usual, and can transmit and receive data at a rate of several Kbps, thereby enabling high-speed communication. As a representative example of such an FSK transmitter / receiver 22, a general-purpose modem (MODEM) can be easily implemented.

Referring to the operation of the data transmission and reception apparatus of the security control system configured as shown in FIG. 2 is as follows.

Now, when an abnormal situation is detected in the subscriber's security area and the security terminal automatically dials to call the data transmission / reception apparatus in the security control system, the telephone ring signal is received on the telephone lines L1 and L2 shown in FIG. The telephone ring signal coming into the telephone lines L1 and L2 is detected by the ring detection circuit built into LIU 10 and input to the controller 16. When the ring detection signal is input two or more times in succession, the controller 16 supplies a call path forming control signal to the LIU 10 to change the hook-off state. At this time, the LIU 10 forms a trunk line call loop in response to the input of the call path forming control signal as described above. When the trunk line call loop is formed as described above, the telephone lines L1 and L2 of the LIU 10 are connected to the communication mode switching unit 18.

On the other hand, as described above, the control unit 16 which hooks off the telephone lines L1 and L2, which are trunk lines, by supplying a communication line forming control signal to the LIU 10, controls the control signal transmitter 14 to start a data transmission start signal having a frequency of 1400 Hz. Kiss on signal) is generated continuously for about 2 seconds. Here, the data transmission start signal is a message for notifying the security terminal to start data transmission as described above. The data transmission start signal generated as described above is transmitted to the security terminal (not shown) which is the counterpart subscriber via the communication mode switching unit 18 and LIU 10.

The security terminal recognizes that data may be transmitted by receiving a data transmission start signal that is continuous for about two seconds, and transitions to the data transmission mode to perform data transmission. The initial data transmission in the security terminal is transmitted in the DTMF method, and when the specific data is to be transmitted at high speed, the communication mode switching data is output as the DTMF data. In this case, the communication mode switching data transmitted from the security terminal is composed of a DTMF tone (corresponding to the # key) synthesized with 1477 Hz and 941 Hz, and a DTMF tone (corresponding to the * key) with 1209 Hz and 941 Hz synthesized. It is output from the terminal.

The data transceiver of the security control system shown in FIG. 2 is connected for communication via the DTMF transceiver 20 and the FSK transceiver 22. Initially, the communication mode switch 18 is connected to the DTMF transceiver 20 side. Therefore, the data transmitted from the initial security terminal to the DTMF is input to the DTMF transceiver 20 through the LIU 10 and the communication mode switch 18 of FIG. The DTMF transceiver 20 converts the input DTMF signal into a corresponding digital signal and inputs it to the controller 16.

On the other hand, the control unit 16 for inputting the data output from the DTMF transceiver 20 retrieves the input data. If it is determined that the input data corresponds to #, *, the controller 16 outputs a mode switching signal for switching the communication mode to the communication board switching unit 18. At this time, the communication mode switch 18 blocks the data communication path between the LIU 10 and the DTMF transmitter / receiver 20 in response to the input of the mode switch signal, and forms a data communication path between the FSK transmitter / receiver 22 in the LIU 10. If the data input in the form of DTMF does not correspond to #, *, the data path between the LIU 10 and the DTMF transceiver 20 is maintained as it is so that data communication is performed in the DTMF method.

When the FSK modulated signal is transmitted from the security terminal while the data communication path between the LIU 10 and the FSK transmitter / receiver 22 is connected as described above, it is input to the FSK transmitter / receiver 22 through the LIU 10 and the communication mode switcher 18. The FSK transmitter / receiver 22 demodulates the input FSK modulated analog signal into a digital signal and inputs it to the controller 16. When the controller 16 inputs data corresponding to the received data to the FSK transceiver 22, the FSK transmitter / receiver 22 modulates the input data into a signal of the FSK and outputs the signal to the communication mode switch 18. The communication mode switching unit 18 transmits the input FSK signal to the security terminal which is the counterpart through the LIU 10. Accordingly, by the above operation, data can be transmitted and received at high speed between the security terminal and the data transmission / reception apparatus of the security control system using the FSK method. At this time, the communication carrier between the security terminal and the data transmission / reception device of the security control system is made of ASCII (ASCII) code, which enables communication between any terminal.

When the data communication is terminated by transmitting and receiving data using the FSK method as described above, the controller 16 controls the control signal transmitter 14 to generate a 1400 Hz data off signal (Kiss off signal) for about 2 seconds. The data end signal generated as described above is transmitted to the security terminal through the communication mode switching unit 18 and LIU 10. Meanwhile, the controller 16 which has transmitted the data end signal reads the output of the FSK transmitter / receiver 22 and waits for the data of the next frame to be received. If there is no data for a predetermined time, the controller 16 outputs a call control signal to the LIU 10. Block the phone to hook on. That is, hang up the phone.

In addition, when the controller 16 shown in FIG. 2 outputs a call path forming control signal to the LIU 10 to remotely control one of a plurality of security terminals located at a remote location, and supplies dialing data to the DTMF transmitter / receiver 20, The LIU 10 forms a call line current loop of telephone lines L1 and L2 in response to the call path forming control signal. The DTMF transmitter / receiver 20 generates DTMF tones corresponding to the dialing data output from the controller 16 and transmits the DTMF tones to the PSTN through the communication mode switching unit 18 and lLIU 10.

The PSTN transmits a ring signal to the security subscriber corresponding to the DTMF tone transmitted by the above operation, and a call path is formed between the security terminal and the data transmission / reception device of the security control system. When the call path is formed by the above operation, that is, when the security terminal answers the call, the controller 16 may remotely control the security terminal by transmitting and receiving the FSK as described above through the FSK transmitter / receiver 22.

Although the configuration of the security terminal has not been described in detail in the present invention, the security terminal should also have a built-in FSK transceiver capable of transmitting and receiving FSK signals.

As described above, the present invention can dualize the data transmission / reception scheme between the security terminal located in the security area and the data transmission / reception device in the security control system in the form of DTMF, FSK, and thus can transmit and receive data at high speed. The error rate can be reduced and data compatibility with existing security terminals can be achieved.

Claims (4)

A redundant data automatic transmitting / receiving apparatus, comprising: a line interface unit connected to a telephone line, detecting and receiving an incoming ring, and forming a call loop in response to an input of a call path forming control signal; and a tone-modulated analog signal. And a first transmitter / receiver for demodulating and outputting the digital data as an analog signal and demodulating and outputting the frequency shift-modulated analog signal as a digital signal, and outputting the digital data input by demodulating the frequency data. A communication mode switching unit for forming a data path between the second transmitting and receiving unit, the line interface unit and the first transmitting and receiving unit, and converting the data path into the second transmitting and receiving unit in response to an input of a mode switching signal; Supplying the call path forming control signal to the line interface unit in response to an input of And a control unit for outputting the mode switching signal in response to the input of the mode switching data input to the first transmitting and receiving device and controlling the second transmitting and receiving device to transmit and receive data. Transceiver. The automatic transmission / reception of redundant data according to claim 1, further comprising a control signal transmission unit for selectively generating data transmission and termination signals by a predetermined control and outputting the signal to the other party through the communication mode telephone unit and the line interface unit. Device. The apparatus of claim 1 or 2, wherein the first transmitter / receiver includes a DTMF receiver for converting a signal of the DTMF into digital data, and a DTMF receiver corresponding to the digital data. The apparatus of claim 1 or 2, wherein the second transmitter / receiver is a modem including an analog noise filter.