KR940000458B1 - Doorphone system - Google Patents

Abstract

The doorphone communicating apparatus and method using a telephone includes a first relay for connecting a telephone and a line, a second relay for connecting the telephone and the line of an outer doorphone, a ring detector for discriminating a reception signal, a current detector for detecting the hook on/off of the telephone, a DTMF decoder for decoding a DTMF signal, a microcomputer for generating a tone generating signal, a door opening signal, and the control signal of the first and second relays, and a tone generator for generating a tone signal according to the control signal of the microcomputer, thereby enabling the communication using a tlephone.

Description

Door phone call device and method using a telephone

1 is a conventional phone and door phone configuration diagram.

2 is a system configuration according to the present invention.

3 is a flow chart according to the present invention.

4 is an interrupt flowchart according to the present invention.

5 is a waveform diagram of a tone signal output to the receiver.

* Explanation of symbols for main parts of the drawings

10: microcomputer 20: current sensor

30: outside door phone 40: ring detector

50: DTMF decoder 60: tone generator

RY1-RY2: First-second relay

The present invention relates to an apparatus and method for talking to a door phone using a telephone in a home automation system.

In general, the home phone and the door phone are separately configured as shown in FIG. 1 to perform each function independently.

Therefore, when there is a call or a visitor's call, there is an uncomfortable problem of moving to a location where a phone or door phone is installed and picking up the handset.

Accordingly, an object of the present invention is to provide an apparatus and a method for making a door phone and a trunk line call installed outside using a telephone.

Another object of the present invention is to provide an apparatus and method which can switch to a door phone call during a trunk line call and a switch to a trunk line call during a door phone call.

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

2 is a system block diagram according to the present invention, the current sensor 20 for detecting a hook on / off state of the phone, and an external door phone that has a built-in call switch and can call the other party in the home from the outside ( 30, a first relay RY1 for switching by a control signal of the microcomputer 10 so that a call path between the telephone line and the trunk line is connected, and connected between the external door phone 30 and the telephone; A second relay RY2 for switching the communication path between the external door phone 30 and the telephone by a control signal of 10), and a ring detecting unit 40 connected to a trunk line to detect an incoming signal And a DTMF decoder 50 for decoding and outputting a key signal input from a telephone, an output signal of the current detector 20, a call signal of the external door phone 30, and a ring detection of the ring detector 40. Signal, the output signal of the DTMF decoder 50 And a tone signal generated by the microcomputer 10 generating the tone generation control signal and the door open signal and the switching control signal of the 1-2 relay RY1-RY2, and the control signal of the microcomputer 10. The tone generating unit 60 is configured.

3 is a flowchart according to the present invention, a first step of checking whether there is an incoming signal from a trunk line, a second step of generating a tone signal when there is no incoming signal and a hook-off state in the first step, and the second step A third process of checking whether a CO line selection key signal or a door phone selection key signal is input after the tone signal is generated in the second signal; and when the CO line selection key signal is input in the third process, the first relay is turned on to A fourth process of forming a door phone call path by turning on a second relay when the door phone selection key signal is input in the third process, and forming a call path in the process 4-5 A sixth step of blocking a call when there is no call mode switching signal after the call mode switching signal, and a seventh step of generating a tone signal when the call mode switching signal is present in the sixth step and checking whether the hook is flashed; , Lesson 7 above When the hook flash from the made up of the eighth step of switching the communication mode.

FIG. 4 is a flowchart illustrating an interrupt routine according to the present invention, which checks whether a call is in progress with a door phone and connects a trunk line when not in a call, and a predetermined time tone when the door phone is busy in the first step. It consists of a second process of generating a signal.

5 is a waveform diagram of a tone signal heard by a handset

One embodiment of the present invention based on the above-described configuration will be described in detail with reference to FIGS.

Referring to FIG. 2, when the first to second relays RY1 to RY2 are operated, the common terminal C and the normal cross terminal NC are connected when the first relay RY1 is not connected. In this case, the common terminal C and the normal open terminal NO are connected to the trunk line. The second relay RY2 is connected to the door phone only when a call is established in the telephone period. Therefore, referring to the flowchart of FIG. 3 of the embodiment according to the present invention, in step (3a), it is checked whether there is an incoming signal input from the trunk line through the ring detector 40, and if there is an incoming signal, the intercept (INT) is performed in step (3c). If no routine is received, the routine performs the routine (3b). In step (3b), if the handset of the telephone is hooked off, if it is not hooked off, step (3a) is again performed, and if it is hooked off, step (3d) is performed. In step (3d), the tone generator 60 is driven to generate a tone signal as shown in FIG. 5A is an output signal of the tone generator 60, and 5B is a beep sound heard from the trunk line. In step (3e), it is checked whether button "9" is pressed.

That is, when the user presses a key button of the telephone and checks whether the DTMF signal output through the DTMF decoder 50 is the 9th key signal, if the 9th key signal is performed (3f), if the 9th key signal is not (3i) Perform In step (3f), the relay RY1 is turned on to connect with the CO line and step (3g) is performed. In the step (3g) to stop the operation of the tone generating unit 60 to turn off the tone generation signal to form a trunk line call path (30). In step (3i), it is checked whether the button "#" is pressed. That is, when the user presses the key button of the telephone and checks whether the DTMF signal output through the DTMF decoder 60 is a #key signal, if the #key signal is performed, performs step (3j) and if not a #key signal, performs step (3o). do. In step (3j), the second relay RY2 is turned on and then step (3k) is performed. In the step (3k) to stop the operation of the tone generating unit 60 to turn off the tone generation signal to form a door phone call path. When it is necessary to open the door during the call with the visitor by forming a door phone call path in step (3k), it is checked whether the button "*" is pressed in step (3m).

At this time, when the user presses the button "*" of the telephone, the button "*" signal is applied to the first port P1 of the microcomputer 10 through the DTMF decoder 50. Therefore, in step (3n), the microcomputer 10 applies the door open signal to the external door phone 30 through the output terminal 03 to open the door. On the other hand, the trunk line call path is formed in step (3g) to make a trunk line call or the door phone call path is formed in step (3k) to check whether there is a call mode switching signal in step (3o). The call mode switching signal is, for example, when a trunk line call path is formed and there is a door phone call signal from the external door phone 30 during the trunk line call, the door phone call signal is called a call mode switching signal and a door phone call path is formed. When the incoming signal from the CO line is detected by the ring detector 40 during the door phone call (that is, when a call is received from the CO line), the incoming signal detected by the ring detector 40 is called a call mode switching signal. That is, if the call signal is input from the external door phone 30 to the second interrupt terminal I2 of the microcomputer 10 when the phone is in the line call, there is a door phone call mode switching signal and the phone is in communication with the door phone. When the ring detection signal is input to the third interrupt terminal I3 of the microcomputer 10 from the ring detector 40 that detects a call from a CO line, there is a CO line switching mode switching signal. Therefore, if there is no call mode switching signal in step (3o), it checks whether the handset of the telephone is hooked on in step (3p) and if the call is hooked, the call is terminated. In the step (3q), the first to second relays (RY1 to RY2) are turned off to block the call path and return. However, if there is a call mode switching signal in step (3o), in step (3r) the microcomputer 10 outputs a tone generation driving signal through the second port (P2) to drive the tone generator 60 to the user Informs that there is a call mode switching signal (3s) and performs the step.

In step (3s), it is checked whether the phone is hook-flashed, and if it is hook-flashed, step (3t) is performed. In step (3t), it is checked whether or not there is a trunk line call. That is, it is determined whether the call mode before the call mode switching signal is the trunk line call mode or the door phone call mode. In the case of the trunk line call in step (3t), the process is performed again in step 3j to switch to the door phone call mode, and if the door phone is busy, step 3f is performed again to switch to the trunk line call mode. On the other hand, the interrupt routine of FIG. 4 is caught when there is an incoming signal from the trunk line. In step (4a), it checks whether the door phone is in a call and performs step (4c) if the door phone is in a call. In step (4b), the first relay RY1 is turned on to form a trunk line call path and return. In step (4c), the tone generating unit 60 is driven to turn on the tone generation signal, and step (4d) is performed. In step (4d), it is checked whether or not the predetermined time has been set, and when it has passed, in step (4c), the operation of the tone generator 60 is stopped to turn off and return the tone generation signal.

As described above, there is an advantage in that a door phone and a trunk line call are installed externally by using the phone, and a call can be switched during a call.

Claims (3)

In a door phone communication apparatus using a telephone of a home automation system having an external door phone (30), the first relay (RY1) connecting the telephone line and the trunk line, and the telephone and the external door phone (30) A second relay RY2 for connecting a line, a ring detector 40 for determining an incoming signal from a trunk line, a current detector 20 for detecting a hook on / off state of the telephone, and the telephone DTMF decoder 50 for receiving and decoding the DTMF signal, the detection signal of the current sensor 20, the call signal of the external door phone 30 fraud ring detection signal of the ring detector 40, the DTMF decoder 50 To the tone generation control signal, the door open signal, and the first to second relays (RY1 to RY2) to generate the control signal, and the tone signal by the control signal of the microcomputer (10). Apparatus characterized in that configured as a tone generating unit 60 for generating a. A door phone call method using a telephone of a home automation system, comprising: an incoming signal inspection process for checking whether there is an incoming signal from a trunk line, and a tone signal for generating a tone signal when there is no incoming signal and a hook-off state is detected in the incoming signal inspection process A call selection signal inspection process for checking whether a CO line selection key signal or a door phone selection key signal is input after the tone signal is generated during the tone signal generation process; and a CO line selection key signal is input during the call selection signal inspection process. When the door phone selection key signal is input during the call selection signal inspection process, the door phone call forming process for forming a door phone call path, and the call line forming process; If there is no call mode switching signal after the call path is formed during door phone call formation, A hook flash inspection process for checking whether a call signal is generated and a hook flash state occurs when a call mode switching signal is generated after a call path is formed during the CO line call formation process or the door phone call formation process; When the hook flash state in the hook flash check process, the method characterized in that the call MOD is made in the switching process. The method of claim 2, further comprising generating a door open signal and opening the door after the door phone call is formed in the door phone call forming process.

Images