KR20100045863A - Video phone system - Google Patents

Abstract

PURPOSE: A video phone system using a 2-wired video phone system is provided to facilitate extension work of a monitoring device unit and a calling device unit by enabling the transmission between those two devices. CONSTITUTION: A monitoring unit(200) is connected to a calling device unit(300) through first and second communication lines(101,102), and an external signal mixing unit and an internal signal mixing unit transmits an initial call signal and a recall signal to the monitoring device unit. A call signal detection module detects the initial call signal with the recall signal, and a control unit outputs a control signal to a first power control unit when the initial call signal is discriminated.

Description

Visitor monitoring and control device using two-wire video phone system {VIDEO PHONE SYSTEM}

The present invention is to monitor the visitor using a video phone system, in particular by controlling the video signal and the audio signal input to the call device unit installed in at least one or more entrances through the monitor device unit provided in the two-wire video phone system It relates to a technique for monitoring the visitor.

In general, the video phone system is widely applied to home automation products as a part of a home network system, and various information, including calls and calls, between the visitor and the landlord (or householder) can be transferred. It is widely used as a means of exchange.

However, in recent years, it is being widely used as a means for monitoring and control in order to prevent crime in terms of preparing for home security for increasingly suspicious visitors.

1 is a view showing a schematic overall configuration for monitoring and controlling visitors using a conventional four-wire video phone system.

The conventional video phone system 10 includes a common line (GND) including a DC power supply (Vcc) supply line mainly between a monitor device unit 20 installed indoors and a caller unit 30 installed at an entrance such as an entrance. It consists of a four-wire communication line (11), such as audio signal line, video signal line is a situation that is used as a communication and monitoring means between the room and the entrance.

In this case, in the case of a house having two or more entrances and exits, the call device unit 30 may be installed in a plurality of different positions (for example, a front door and a rear door).

In the conventional technology as described above, when the visitor located in front of the call device unit 30 installed at the doorway presses the call button 31, the image information of the visitor captured by the camera module 33 is transferred to the monitor device unit 20. The visitor is monitored in a manner that the image signal is transmitted as a video signal and displayed on the screen unit 23.

However, in the related art, since the power and signal transmission is performed by the four-wire communication line 11 as mentioned, the line extension work is performed when the monitor device 20 and the call device 30 are expanded. Not only is it very difficult, but there is a real need for improvement of problems such as an increased installation cost.

The present invention for solving the conventional problems as described above is to provide the DC signal (Vcc) between the monitor device and the call device unit, including the transmission of the video signal and the audio signal by the two-wire system, the call device unit The purpose is to control the video signal and the audio signal of the visitor to be input to the monitor.

Means for solving the problems of the present invention as described above is characterized in that the monitor device and the call device is connected to the electrical signal via the first and second communication lines.

In addition, it characterized in that the outer signal mixing unit and the inner signal mixing unit for transmitting the first call signal and the re-call signal generated in the call device unit to the monitor device unit.

In addition, the call signal detection module for detecting the first call signal and the re-call signal received through the outer signal mixer and the inner signal mixer is characterized in that the configuration.

The apparatus may further include a controller configured to determine a first call signal and a recall signal detected by the call signal detection module, and output a control signal to the first power controller when the first call signal is determined.

DETAILED DESCRIPTION OF EMBODIMENTS Hereinafter, problems and solutions to be solved by the present invention will become more apparent from the detailed description of various embodiments shown in the accompanying drawings.

In the present invention as described above, since the transmission of the video signal and the audio signal including the supply of the DC power supply (Vcc) between the monitor device and the call device by the two-wire system, the monitor device 20 and the call device 30 Not only can the expansion work be easily done, but it also provides the beneficial effect of reducing the cost of line construction.

In describing specific embodiments of the present invention, the configuration and actions thereof are illustrated by the drawings of the present invention and described as at least one exemplary embodiment, whereby the technical idea of the present invention and its core configuration And actions should not be limited.

It should be noted that the same components in the drawings described in the present invention for reference, the same reference numerals are given the same reference numerals as much as possible even if shown in different drawings.

Hereinafter, a visitor surveillance control apparatus using a two-wire video phone system according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram showing the overall configuration for controlling visitor surveillance using a two-wire video phone system according to the present invention.

The technical configuration of the overall concept of the two-wire video phone system 100 as a means for solving the problems of the present invention is electrically connected to the monitor device 200 through the interface (204) (304) Calling device unit 300 connected to the signal is composed of a set (Set).

Here, the interface unit 204, 304 is the first and second communication line 101 provided in two wires using a terminal or a connector as a connecting means for supplying an electrical signal It would be desirable to connect 102.

In the present invention, the two-wire video phone system 100 is made nonpolar through the first and second communication lines 101 and 102 between the monitor device unit 200 and the call device unit 300, which are external signals. By connecting the bridge diode (bridge diode) to the first and second terminals (# 1) (# 2) of the interface unit 304 in the mixing unit 317, the call unit 300 in the monitor unit 200 It will be possible to connect non-polarity to Vcc power supply to).

On the other hand, the meaning of the electrical signal includes a communication means using the video FM modulation method to facilitate the long-distance transmission of the video signal, including the Vcc source supply between the monitor device unit 200 and the call device unit 300. It would be desirable to.

Since the FM signal is supplied by modulating the video signal, long distance transmission is possible because the video signal is not generated by the interference of the high audio signal.

The monitor unit 200 is installed in the interior of the building, mainly in the case of apartments and houses are increasingly installed in the living room as part of the home network system.

In addition, the call device 300 is installed at the entrance or entrance, in the case of apartments are installed on the wall of the entrance, and in the case of houses, when the entrances are two or more places such as the front door and the back door, the visitor frequently visits. It would be desirable to select and install the appropriate one.

Of course, in the case where the entrance is two or more places, such as the front door, the back door, it will be possible to install all of the call device unit 300 in plurality.

When the visitor calls the landlord by pressing the call button 301 provided in the call device 300 at the entrance and exit, the visitor indoors through the first and second communication lines 101 and 102. The call signal is output to the speaker 203 by being connected to the electrical signal between the monitor device 200 installed in the.

In addition, a separate call or call to the call device 300 according to the call from the call device 300 is connected to the monitor device 200 through the first and second communication lines (101, 102) While monitoring the video information of the visitor captured by the provided camera module 313 to the screen unit 223, the monitoring control is performed whether or not the visitor is suspicious.

For reference, the visitor's image information is meant to include the visitor's face and the whole body captured by the camera module 313 and displayed on the screen unit 223.

Next, the configuration of the monitor device unit 200 provided in the video phone system 100 according to the present invention will be described in more detail with reference to the accompanying drawings.

3 is a block diagram illustrating a schematic circuit configuration of a monitor device included in the video phone system in FIG. 2 according to the present invention.

The main components of the monitor device 200 include a power module 210, an image module 220, a sound module 230, a call signal detection module 240, and a control unit 250. A first impedance matching unit 212, an inner signal mixing unit 217, a mode setting unit 224, an OSD (on screen display) generation unit 225, a camera control unit 228, and a storage unit 226. ) And the like.

First, the power supply module 210 for driving the monitor device 200 and the call device 300 in the present invention will be described.

The power module 210 is composed of a power supply unit 211 and a first power control unit 215, the power supply unit 211 is a conventional commercial AC voltage (for example: AC 100V or 220V) to a DC voltage It includes a bridge rectifier circuit (not shown) for rectifying, and configures a switching mode power supply (SMPS) circuit (not shown) for generating multiple DC voltages. Characterized by generating a Vcc power source for driving the monitor device 200 and the call device 300.

In addition, the first power control unit 215 connected to the power supply unit 211 is a power control circuit for supplying the Vcc power output from the power supply unit 211 to the calling device unit 300, which will be described in detail later. When the first call signal generated by the call device unit 300 is detected and determined by the call signal detection module 240 and the control unit 250 of the monitor device unit 200, the control unit 250 firstly determines the first call signal. Outputs a control signal to the power control unit 215 to connect the Vcc power generated by the power supply unit 211 to the first communication line 101 via the first impedance matching unit 212 and the inner signal mixing unit 217. The external signal mixing unit 317 through the first terminal # 1 of the interface unit 204 or 304 connected to the terminal (for example, the terminal # 1 in FIGS. 3 and 4). The second power supply control unit 315 of the call device unit 300 is configured to pass through the configuration.

In this case, the inner signal mixing unit 217 is also referred to as an FM image carrier carrier frequency signal (or "FM image carrier carrier frequency") included in the image information captured by the camera module 313. And a voice signal input through the microphone 302 to the monitor apparatus 200, and further inputs the voice signal and the call apparatus 300 input through the microphone 202 of the monitor apparatus 200. Characterized in that it comprises an electrical signal transmission means for supplying a Vcc power source for driving.

The first impedance matching unit 212 is connected to the call device unit 300 through a Vcc power line supplied from the monitor device unit 200 to the call device unit 300, that is, the first communication line 101. Since the unmodulated audio signal and the FM video modulation carrier frequency signal are supplied to the monitor device unit 200, the audio signal and the FM video modulation carrier frequency signal are supplied to the first power control unit 215 and the power supply unit 211. This prevents the internal circuit from being lost.

For example, an internal circuit of the first power control unit 215 and the power supply unit 211 may be provided with a voice signal supplied between the monitor device unit 200 and the call unit 300 through the inner signal mixing unit 217. The first impedance matching unit 212 including an impedance matching circuit is formed between the inner signal mixing unit 217 and the first power control unit 215 to prevent the loss from the audio signal. It would be desirable to prevent them.

In addition, an FM image modulation carrier frequency signal supplied from the calling device unit 300 to the inner signal mixing unit 217 of the monitor device 200 through the first communication line 101 is supplied to the first power control unit 215. And a coil having a high impedance characteristic at an FM image modulation carrier frequency between the inner signal mixing unit 217 and the first power control unit 215 to prevent loss from an internal circuit such as a power supply unit 211. It may be desirable to configure a first impedance matching unit 212 including a coil, that is, an inductance component, to prevent loss of the FM image modulation carrier frequency signal.

Next, the call signal detection module 240 for detecting and discriminating the call signal according to the first call signal and the recall signal generated from the call device unit 300 will be described in the present invention.

The call signal detection module 240 is composed of a call signal detection unit 231 and a recall signal detection unit 232, when the visitor presses the call button 301 provided in the call device unit 300, this caller The first call signal (Call Signal) through the signal output unit 318, that is, the first call signal via the outer signal mixing unit 317 through the interface unit 304, 204 to the monitor device unit 200 to the call signal Will output

In this case, a voltage level of about + 7V is supplied to the calling device 300 by the first power control unit 215 of the first monitor device 200 in the standby mode. Since the first call button 301 is pressed by the visitor, the first communication line 101 connected to the first terminal # 1 of the interface unit 304 or 204 has a voltage level in the standby mode ( Based on + 7V), the voltage level is reduced by about 50% or more below about + 3.5V level.

In addition, the decrease of the voltage level (about + 3.5V) is detected by the call signal detector 231 provided in the monitor apparatus 200, and the supplied signal is supplied to the controller 250 to provide the detected signal. The first call signal (or 'first call signal') may be used for discrimination.

At this time, the control unit 250 supplies a control signal to the first power control unit 215, including the camera module 313 of the calling device 300, the FM image modulator 314, the second audio hybrid unit 316. ) To supply Vcc power for operation.

In addition, when the first call signal is determined, the Vcc power supplied from the monitor device 200 drives the camera module 313 through the second impedance matching unit 312 and the constant voltage unit 311 to display the visitor's image information. The image is taken.

As such, when the visitor's image information captured by the camera module 313 is supplied to the FM image modulator 314, the FM image modulator 314 outputs an FM image modulated carrier frequency signal to output the outer signal mixer 317. ) Will be supplied.

 In this case, the FM image modulation carrier frequency signal supplied to the outer signal mixing unit 317 is input to the image module 220 provided in the monitor device unit 200 via the interfaces 304 and 204 to output the image output unit ( The image information of the visitor is output to the screen unit 223 through 222.

The visitor returns the call button 301 within a time interval (eg, 10 seconds, 30 seconds, 1 minute, etc.) set by the mode setting unit 224 based on the time when the first call signal occurs. When pressed again, at this time, the FM video modulator 314 supplies a recall signal (or can be expressed as a 'second call signal') and is connected to the interface unit through the external signal mixer 317. The recall signal detection unit 232 detects the recall signal by outputting the recall signal to the monitor device 200 through 304 and 204, so that the recall signal is determined through the control unit 250. It is characterized by that.

In other words, when the Vcc power is supplied from the first power control unit 215 of the monitor apparatus 200 to the call apparatus 300 according to the first call signal as shown in FIGS. The camera module 313 and the FM image modulator 314 and the second audio hybrid unit 316 provided in the unit 300 operate.

In addition, the camera module 313 is a video signal and a vertical synchronous frequency signal (for example; NTSC 60Hz, PAL 50Hz) of the image information of the visitor to the FM image modulator 314 The second recall signal of the visitor, which is supplied and output from the call signal output unit 318, is input to the FM image modulator 314.

In addition, the FM image modulator 314 is connected to the FM image modulation carrier frequency signal in a section in which the call button 301 of FIG. 5 operates when the visitor presses the call button 301 for the second time. In the vertical synchronization period (for example, NTSC method is about 16.7ms, PAL method is about 20ms), the oscillation of the FM image modulation carrier frequency signal is stopped for about 30 to 45us in the blanking section of the video signal. Alternatively, the FM image modulation carrier frequency signal may be blocked by blocking the output of the FM image modulation carrier frequency signal by a separate switching means.

Of course, the FM image modulator 314 may include an oscillation circuit.

At this time, the recall signal is included in the FM image modulation carrier frequency signal and supplied to the outer signal mixing unit 317, and the interface unit 304 for correspondingly connecting the calling device unit 300 and the monitor device unit 200 ( Only the FM image modulation carrier frequency signal is passed through the FM band pass filter unit 221 provided in the monitor device unit 200 through 204, and other frequency components are blocked and supplied to the FM image demodulation unit 214. Done.

In addition, the FM image demodulator 214 outputs a low pulse signal to a section in which the FM image modulation carrier frequency signal is cut off (for example, about 30 to 45 kHz) and recall signal detection unit 232. The low call signal is detected by the recall signal detector 232 and supplied to the controller 250.

Subsequently, in the controller 250, the low pulse signal detected by the recall signal detector 232 is the vertical synchronization period (eg, NTSC method is about 16.7 ms, and PAL method is about 20 ms). ) Is discriminated against the recall signal.

In this case, in order to include the recall signal in the FM image modulation carrier frequency signal, the section for blocking the FM image modulation carrier frequency signal should be cut off over a very short section of about 30 to 45us in the blanking section of the video signal. Noise does not occur in the video signal.

Next, the configuration of the image module 220 according to the present invention will be described.

The image module 220 includes an FM band pass filter unit 221, an FM image demodulation unit 214, and an image output unit 222. The image module 220 includes a visitor's image signal transmitted from the calling device unit 300. The FM band pass filter unit 221 which passes only the FM image modulation carrier frequency signal belonging to a predetermined band and the image output unit by demodulating the video signal from the passed FM image modulation carrier frequency signal. An FM image demodulator 214, which has been described above, for supplying to the 222 is configured.

Also, an image output unit 242 is configured to amplify the image signal demodulated by the FM image demodulator 214 to a predetermined level and display the visitor's image information through the screen unit 223.

Here, the screen unit 223 may preferably include a cathode ray tube (CRT) or a liquid crystal display (LCD). However, it is preferable that the screen unit 223 is not limited to the range of the screen unit 223.

In addition, the video information of the visitor imaged through the camera module 313 is classified into a visit date and time zone and directoryed, and stored in the storage unit 226 to store the video phone system 100 when a problem or event occurs. Alternatively, it may be desirable to review the video information of the visitor through a video player connected to the video phone system 100 separately.

In this case, the visitor's image information that is directoryed and stored in the storage unit 226 is implemented in an OSD state on the screen unit 223 through the OSD generator 225 to provide convenience of function operation. It would be desirable.

The storage unit 226 includes EEPROM (Electrically Erasable and Programmable Read Only Memory), EPROM (Erasable and Programmable Read Only Memory), PROM (Programmable Read Only Memory), ROM (Read) in the monitor device unit 200. It is preferable to use a memory device such as Only Memory, Flash Memory, etc., but it is more preferable not to be limited to the aforementioned cases.

Next, the configuration of the sound module 230 in the present invention will be described.

The sound module 230 includes a first audio hybrid unit 216, a back tone sound transmitting unit 251, a call sound generating unit 252, and a call sound amplifier 253.

First, the first audio hybrid unit 216 is an interface for connecting the monitor unit 200 and the call unit 300 to a voice signal input through the microphone 202 included in the monitor unit 200. It is supplied to the outer signal mixing unit 317 of the calling device unit 300 through the units 204 and 304 to amplify the audio signal from the second audio hybrid unit 316 and output it to the speaker 303. The first audio hybrid unit 216 amplifies the audio signal by receiving the voice signal input from the microphone 302 included in the call device 300 through the inner signal mixing unit 217 of the monitor device 200. To be output to the speaker 203.

In addition, when the call button 301 is pressed by the visitor in the call device unit 300, the call sound generator 252 for generating a call sound and amplified the generated call sound are output through the speaker 203. Call tone amplifier 253 is configured for.

It is preferable that the generated ring tone includes various melodies and songs, etc., which may be set by selecting a preferred melody or song in the mode setting unit 224.

In addition, the back tone to deliver the tone back to the speaker 303 through the second voice hybrid unit 316 provided in the call device 300, the call sound generating unit 252 The unit 251 is configured.

The control unit 250 mentioned in the present invention includes a micom, and the overall control operation of the video phone system 100 and the first call signal and the recall signal are made through the control unit 250. It would be desirable to lose.

For reference, the call button 201 provided in the monitor device unit 200 is connected to the monitor device unit 200 and another monitor device unit (not shown) connected through a separate interface unit (not shown). As a button for making a call request for an indoor call between the two, it generates a call signal to the another monitor device.

Next, the configuration of the call device 300 included in the video phone system 100 will be described in more detail with reference to the accompanying drawings.

FIG. 4 is a block diagram illustrating an exemplary circuit configuration of the calling device unit included in the video phone system according to the present invention.

The Vcc power generated by the power supply unit 211 included in the monitor device unit 200 passes through the first power control unit 215, the first impedance matching unit 212, and the inner signal mixing unit 217 to communicate with the first communication line. Through terminal 1 # 1 of the interface unit 204 (304) connected corresponding to the connection terminal (for example; terminal # 1 in FIGS. 3 and 4) connected to the furnace 101. The second power control unit 315 is configured to receive the supply via the external signal mixing unit 317 and to control the driving Vcc power for operating the call device 300.

Here, the outer signal mixing unit 317 is input through the FM image modulation carrier frequency signal and the microphone 302 outputted through the FM image modulator 314 for the visitor's image information captured by the camera module 313. The audio signal is supplied to the monitor device unit 200 and the voice signal input through the microphone 202 of the monitor device unit 200 and the first call signal in the standby mode in the call device unit 300. To receive a Vcc power supply to drive a standby voltage (e.g., about 7V), a camera module 313, a second audio hybrid unit 316, an FM image modulator 314, etc. Characterized in that it comprises an electrical signal transmission means.

The second power controller 315 does not operate when the standby voltage for detecting the first call signal supplied from the monitor device 200 through the first communication line 101 in the standby mode, and the first call signal is As it is supplied to the monitor device unit 200, the monitor device unit 200 supplies the Vcc power for operating the call device unit 300.

The second impedance matching unit 312 may be connected to the call device unit 300 through a Vcc power line supplied from the monitor device unit 200 to the call device unit 300, that is, the first communication line 101. Since the unmodulated audio signal and the FM video modulation carrier frequency signal (or "FM video modulation carrier frequency") are supplied together to the monitor device unit 200, the audio signal and the FM video modulation carrier frequency are supplied. The signal is prevented from being lost in the internal circuits such as the constant voltage unit 311, the second power control unit 315, and the camera module 313.

For example, the audio signal supplied between the calling device unit 300 and the monitor device unit 200 through the outer signal mixing unit 317 is the constant voltage unit 311, the second power control unit 315, and the camera module ( The second impedance matching unit 312 including an impedance matching circuit is formed between the second power control unit 315 and the constant voltage unit 311 to prevent the loss from the internal circuit. It would be desirable to prevent loss.

In addition, the FM image modulation carrier frequency signal supplied from the calling device unit 300 to the inner signal mixing unit 217 of the monitor device 200 through the first communication line 101 is a constant voltage unit 311 and a first signal. 2 Impedance characteristics at high frequency of FM image modulation carrier frequency between the second power control unit 315 and the constant voltage unit 311 in order to prevent loss from internal circuits such as the power supply control unit 315 and the camera module 313. It may be desirable to configure a second impedance matching unit 312 including a coil, that is, an inductance component, to prevent the loss of the FM image modulation carrier frequency signal.

In addition, the voice signal input through the microphone 302 included in the calling device 300 is connected to the inner signal mixing unit 217 of the monitor device 200 through the interface unit 304 and 204 to be connected. It is supplied to the speaker 203 and output to the speaker 203, the voice signal received from the microphone 202 provided in the monitor device unit 200 is supplied to the outer signal mixing unit 317 of the call device unit 300 to the voice A second audio hybrid unit 316 for amplifying a signal to a predetermined signal level and outputting the signal through the speaker 303 is configured.

In addition, when the visitor presses the call button 301, it generates a call signal, that is, a first call signal according to the call device unit 300 and the monitor device unit 200 through the outer signal mixing unit 317. The call signal output unit 318 is configured to output the first call signal to the monitor apparatus 200 via the interface units 304 and 204 for corresponding connection.

In more detail, a voltage level of about + 7V is supplied to the calling device unit 300 in the standby mode by the first power control unit 215 of the monitor device unit 200. Subsequently, when the first call button 301 is pressed by the visitor, the first communication line 101 connected to the first terminal # 1 of the interface unit 304 or 204 may be in the standby mode. Based on the voltage level (+ 7V), the voltage level is reduced by about 50% or more below about + 3.5V level.

In addition, the decrease of the voltage level (about + 3.5V) is detected by the call signal detector 231 provided in the monitor apparatus 200, and the supplied signal is supplied to the controller 250 to provide the detected signal. The discrimination is made with the first call signal.

In addition, when the first call signal is determined by the controller 250, the Vcc power supplied from the monitor apparatus 200 drives the camera module 313 through the second impedance matching unit 312 and the constant voltage unit 311. Image information of the visitor is captured.

Subsequently, when the visitor's image information captured by the camera module 313 is supplied to the FM image modulator 314, the FM image modulated carrier frequency signal is output as described above to be supplied to the outer signal mixer 317. In this case, the FM image modulation carrier frequency signal supplied to the outer signal mixing unit 317 is input to the image module 220 provided in the monitor device unit 200 through the interfaces 304 and 204 to output the image output unit. In operation 222, image information of the visitor is output.

At this time, by controlling the movement direction of the camera provided in the camera module 313 up, down, left, and right, the monitor device unit 200 to move the image information of the visitor displayed on the screen unit 223 in the desired direction to capture the image. The camera controller 228 is provided with up, down, left, and right directions, and the control operation is performed by outputting a control signal to the camera module 313 through the controller 250.

In addition, a camera module (313) and a camera module (not shown) provided with a camera (not shown) for generating a video signal by capturing image information of a visitor located in front of or around the call device unit 300 installed at the entrance and exit. The video signal and the vertical synchronization frequency signal output from 313 are supplied to the FM (Frequency Modulation) image modulator 314.

The FM image modulator 314 modulates the FM image modulated carrier frequency signal in the range of about 10 to 15 MHz with respect to the image signal output from the camera module 313 and supplies the FM image modulator 317 to the outer signal mixer 317. .

On the other hand, the call signal output unit 318 is a visitor within a time interval (for example: 10 seconds, 30 seconds, 1 minute, etc.) set by the mode setting unit 224 on the basis of the time when the first call signal occurs. When the user presses the call button 301 again, the call is re-called. At this time, the FM signal modulator 314 supplies the generated recall signal (or second call signal) and responds through the outer signal mixing unit 317. The recall signal is outputted to the monitor apparatus 200 via the interface units 304 and 204 to be connected.

In other words, when the Vcc power is supplied from the first power control unit 215 of the monitor device unit 200 to the call device unit 300 by the first call signal as described above with reference to FIGS. 5 and 6, The camera module 313, the FM image modulator 314, and the second audio hybrid unit 316 provided in the caller unit 300 operate.

In addition, the camera module 313 is supplied with a video signal and a vertical synchronization frequency signal photographing the visitor's video information to the FM image modulator 314 and the second recall call of the visitor output from the call signal output unit 318. The call is input to the FM image modulator 314.

In this case, the vertical synchronization frequency signal is NTSC (National Television System Committee) is 60Hz, PAL (Phase Alternation by Line system) is preferably 50Hz.

In addition, the FM image modulator 314 is connected to the FM image modulation carrier frequency signal in a section in which the call button 301 of FIG. 5 operates when the visitor presses the call button 301 for the second time. Stop oscillation on the FM video modulation carrier frequency signal for about 30 to 45us in the blanking section of the video signal with the vertical synchronization period (for example, NTSC method is about 16.7ms and PAL method is about 20ms). Or by blocking the output of the FM image modulation carrier frequency signal by a separate switching means, the blocking of the FM image modulation carrier frequency signal is achieved.

Also, the FM image modulator 314 may include an oscillation circuit.

At this time, the recall signal is included in the FM image modulation carrier frequency signal and supplied to the outer signal mixing unit 317, and the interface unit 304 for correspondingly connecting the calling device unit 300 and the monitor device unit 200 ( Only the FM image modulation carrier frequency signal is passed through the FM band pass filter unit 221 provided in the monitor device unit 200 through 204, and other frequency components are blocked and supplied to the FM image demodulation unit 214. Done.

In addition, the FM image demodulator 214 outputs a low pulse signal to a section in which the FM image modulation carrier frequency signal is cut off (for example, about 30 to 45 kHz) and recall signal detection unit 232. And the recall signal detection unit 232 detects the low pulse signal and supplies the low pulse signal to the control unit 250. The portion for determining the recall signal through the control unit 250 has been described above. It will be omitted.

On the other hand, the video information of the visitor output from the camera module 313 is an interface unit 304 for connecting the call device unit 300 and the monitor device unit 200 through the FM image modulation in the FM image modulator 314 204 is input to the inner signal mixing unit 217 of the monitor device unit 200, which is in turn output through the FM band pass filter unit 221 and the FM image demodulation unit 214. And an image output unit 222 for displaying the visitor's image information on the screen unit 223 as a moving image.

It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the core technical spirit of the present invention through the above description.

Therefore, the technical scope of the present invention should not be limited to the contents described in the various embodiments as mentioned, it should be clearly defined by the claims of the present invention.

The present invention is a technology using a two-wire video phone system is an invention of high industrial applicability that is expected to expand the future applicability in terms of ease of expansion work and saving for expansion facilities.

1 is a view showing a schematic overall configuration for monitoring and controlling visitors using a conventional four-wire video phone system.

2 is a diagram showing the overall configuration for controlling visitor surveillance using a two-wire video phone system according to the present invention.

3 is a block diagram illustrating a schematic circuit configuration of a monitor device included in the video phone system in FIG. 2 according to the present invention.

FIG. 4 is a block diagram illustrating an exemplary circuit configuration of the calling device unit included in the video phone system according to the present invention.

FIG. 5 is a diagram illustrating a timing chart of a recall signal generated by a calling apparatus in FIG. 2 according to the present invention.

FIG. 6 is a table illustrating an example of signals for generating and determining a recall signal in FIG. 5 according to the present invention.

Explanation of symbols on the main parts of the drawings

100: video phone system 101: the first communication line

102: second communication line 200: monitor unit

201, 301: Call button 202, 302: Microphone

203, 303: speaker 204, 304: interface unit

210: power supply module 211: power supply

212: first impedance matching unit 214: FM image demodulation unit

215: first power supply control unit 216: first audio hybrid unit

217: inner signal mixing unit 220: image module

221: FM band pass filter unit 222: Image output unit

223: screen unit 224: mode setting unit

225: OSD generation unit 226: storage unit

228 camera control unit 230 sound module

231: call signal detector 232: recall signal detector

240: call signal detection module 250: control unit

251: back tone sound transmission unit 252: ring tone generator

253: call sound amplifier 300: call device

311: constant voltage unit 312: second impedance matching unit

313: camera module 314: FM image modulator

315: second power supply control unit 316: second audio hybrid unit

317: outer signal mixing unit 318: call signal output unit

Claims (11)

A monitor device unit 200 and a call unit 300 connected to electrical signals through the first and second communication lines 101 and 102; An outer signal mixing unit 317 and an inner signal mixing unit 217 for transmitting the first call signal and the recall signal generated by the calling device unit 300 to the monitor device unit 200; A call signal detection module 240 for detecting a first call signal and a call back signal received through the outer signal mixer 317 and the inner signal mixer 217; A controller 250 for determining a first call signal and a recall signal detected by the call signal detection module 240, and outputting a control signal to a first power controller 215 when the first call signal is determined; Visitor monitoring and control device using a two-wire video phone system, characterized in that configured to include. The method of claim 1, wherein the outer signal mixing unit (317); a) supplies to the monitor unit 200 the video information captured by the camera module 313 and the audio signal input through the microphone 302; b) Vcc power source for driving the audio signal and the camera module 313, the FM image modulator 314, and the second audio hybrid unit 316 input through the microphone 202 of the monitor device unit 200. To be supplied with; Visitor monitoring and control device using a two-wire video phone system characterized in that. The method of claim 1, wherein the inner signal mixing unit 217; a) receiving the image information captured by the camera module 313 and the audio signal input through the microphone 302 to the monitor apparatus 200; b) Vcc power source for driving the audio signal and the camera module 313, the FM image modulator 314, and the second audio hybrid unit 316 input through the microphone 202 of the monitor device unit 200. To supply; Visitor monitoring and control device using a two-wire video phone system characterized in that. The method of claim 1, wherein the control unit 250; a) outputting a control signal to the first power control unit 215 when the first call signal is determined; b) the Vcc power generated by the power supply unit 211 is supplied to the calling device unit 300 via the first impedance matching unit 212 and the inner signal mixing unit 217 through the first communication line 101. that; Visitor monitoring and control device using a two-wire video phone system characterized in that. The method of claim 1, further comprising: driving the camera module 313 when the first call signal is determined by the controller 250; Visitor monitoring and control device using a two-wire video phone system characterized in that. The method of claim 1, wherein the first call signal comprises: a; a) when the first call button 301 is pressed in the standby mode; b) The voltage level of 50% or more is reduced based on the voltage level supplied in the standby mode to the first communication line 101 connected to the first terminal # 1 of the interface unit 304 or 204. Detected by the call signal detection unit 231; Visitor monitoring and control device using a two-wire video phone system characterized in that. The apparatus of claim 1, wherein the recall signal comprises: a; a) when a second call signal from the call signal output unit 318 is input to the FM image modulator 314; b) the outer signal mixing unit 317 by blocking the FM image modulation carrier frequency signal for 30 to 45us interval in the blanking interval of the video signal at a vertical synchronization period to the FM image modulation carrier frequency signal in the call button 301 operating period. And an FM image demodulation unit 214 through the FM band pass filter unit 221; c) The FM image demodulator 214 outputs a low pulse signal of 30 to 45 kHz in a section where the FM image modulation carrier frequency signal is cut off in the blanking section of the video signal, and recall signal detection unit 232. ) And a recall signal is detected; d) supplying the low pulse signal detected by the recall signal detection unit 232 to the control unit 250 to determine whether it is equal to the vertical synchronization period; Visitor monitoring and control device using a two-wire video phone system characterized in that. 8. The method of claim 1 or 7, wherein an interval of time for detecting the recall signal is; Set by the mode setting unit 224 on the basis of the first call signal generation time; Visitor monitoring and control device using a two-wire video phone system characterized in that. The method of claim 7, wherein the vertical synchronization period; a) 16.7 ms in the NTSC mode; b) 20 ms in the PAL mode; Visitor monitoring and control device using a two-wire video phone system characterized in that. The voice signal supplied between the calling device unit 300 and the monitor device unit 200 through the outer signal mixing unit 317 is a constant voltage unit 311 and the second power control unit 315, the camera. To prevent loss in the internal circuitry of the module 313; A second impedance matching unit 312 including an impedance matching circuit between the outer signal mixing unit 317 and the constant voltage unit 311; Visitor monitoring and control device using a two-wire video phone system, characterized in that the configuration. The FM image modulation carrier frequency signal supplied from the calling device unit 300 to the inner signal mixing unit 217 of the monitor device unit 200 is a constant voltage unit 311 and a second power supply controller 315. ), To prevent the loss in the internal circuit of the camera module 313; A second impedance matching unit 312 including an inductance component between the outer signal mixing unit 317 and the constant voltage unit 311; Visitor monitoring and control device using a two-wire video phone system, characterized in that the configuration.

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