JPS63233690A - Doorphone camera system for multiple dwelling housing - Google Patents

Abstract

PURPOSE:To easily mount a multiple dwelling housing doorphone camera system by adopting multiplex signals for the communication between outdoor unit installed at the entrance of a multiple dwelling housing and indoor units installed each house of the said multiple dwelling housing so as to use a couple of communication line as signal transmission line. CONSTITUTION:The titled system is constituted of the outdoor unit 100 installed at the entrance of the multiple dwelling housing and plural indoor units 300 installed in each house of the said housing, a couple of communication lines L connected between the outdoor unit 100 and each indoor unit 300 and a repeater 200 as a power supply device supplying a DC power to each indoor unit 100 via the line L. The repeater 200 is provided with a video FM demodulation circuit 201 demodulating an FM modulation video signal included in a multiplex signal sent from the outdoor unit 100 to discriminate the address signal and an address signal detector 202 to detect the address signal from the demodulated video signal. Thus, the doorphone camera system is realized comparatively inexpensively.

Description

Detailed Description of the Invention (Technical Field) The present invention comprises an outdoor unit equipped with a camera unit installed to monitor the entrance of an apartment complex, and a monitor television installed in each household in the apartment complex. This system relates to a door intercom camera system for apartment complexes consisting of multiple indoor units, etc., and in particular multiplexes address signals corresponding to each indoor unit with video signals, audio signals, DC power, etc. inserted within the vertical retrace period. The present invention relates to a technology for transmitting data over a pair of communication lines.

(Prior Art) This type of doorbell camera system for apartment complexes includes an outdoor unit equipped with a camera unit installed at the entrance of the apartment complex to capture images of visitors to the apartment complex, and It consists of a plurality of indoor units each equipped with a monitor TV, which is installed in each household in an apartment complex to display images.Normally, in addition to the above-mentioned camera unit, the outdoor unit also includes This includes a call button for visitors to call the household they are visiting, an intercom unit for visitors to communicate with the household they are visiting, and an electronic lock at the entrance to the apartment complex that is opened and closed by commands from the household they are visiting. In addition to the monitor television, the indoor unit includes a doorbell for announcing a visitor, an intercom unit for communicating with a visitor, a button switch for opening and closing the electronic lock, and the like.

In this way, call signals, audio signals, video signals, electronic lock control signals, etc. transmitted between the outdoor unit and the indoor unit are transmitted individually via a composite cable installed between the outdoor unit and the indoor unit. is being transmitted to.

However, as described above, the work of connecting the outdoor unit and the indoor unit using a composite cable is complicated, and there is a problem in that the cost of installing the doorbell camera system increases. In addition, in the conventional doorbell camera system for apartment complexes, it is necessary to install separate power cables to supply power to each of the multiple indoor units, which also reduces the installation cost of the doorbell camera system for apartment complexes. This is a contributing factor to the high price.

Therefore, in order to solve these problems, we first developed a doorbell camera system for apartment complexes (patent application 1986-2).
No. 11343) has been proposed.

This doorbell camera system for apartment complexes has a frequency change of 1
1 (FM modulated) video signals, bidirectional audio signals, call signals for each indoor unit, various control signals, and DC power are multiplexed and transmitted over a pair of communication lines, making it possible to connect composite cables and power cables. This avoids the complicated work of installing the cable. However, in this system, a carrier with a different frequency is used for each indoor unit as a call signal corresponding to each indoor unit. There is a risk of interference.Also, since DC power is supplied to each indoor unit at a constant current, there is also the problem that power loss in the constant current regulator increases.

(Object of the Invention) The present invention has been made in view of the above circumstances, and it is possible to realize a doorbell camera system as described above at a relatively low cost, and to provide beat interference to a video signal. It is an object of the present invention to provide a door intercom camera system for an apartment complex that is free from noise and can reduce power loss when supplying DC power.

(Structure of the Invention) In order to achieve the above object, the present invention has the following structure.

That is, the doorbell camera system for an apartment complex according to the present invention includes an outdoor unit installed at the entrance of the apartment complex, a plurality of indoor units installed in each household of the apartment complex, and the outdoor unit and each of the indoor units. and a power supply device that supplies DC power to each of the indoor units via the communication line, and the outdoor unit includes a camera unit that photographs a visitor, and a power supply that supplies DC power to each of the indoor units via the communication line, a first intercom unit for communication between the visitor and the indoor unit operator; a group of call buttons for calling the indoor unit of the visitor; and an address signal that generates an address signal corresponding to the call button pressed by the visitor. a generator, address signal multiplexing means for multiplexing the address signal within a vertical blanking period of the video signal output from the camera unit, and a video signal multiplexed with the address signal and output from the first intercom unit. a first signal multiplexing means for multiplexing a voice signal transmitted from the indoor unit and outputting the multiplexed voice signal to the indoor unit; a first signal separating means for applying a signal to the communication line; the power supply includes a first power supply unit that superimposes a DC voltage on the communication line based on a calling operation of the outdoor unit; and each of the indoor units includes: a second signal separation means for separating a multiplexed signal on which DC voltages transmitted from the outdoor unit and the power supply via the communication line are superimposed into a video signal, an audio signal, and a DC voltage; a monitor television unit provided with a signal and a second device provided with said audio signal;
an intercom unit, an address signal detection means for separating an address signal from the video signal and detecting whether or not the address signal is an address signal corresponding to the indoor unit; By detecting the address signal corresponding to the second
a second power supply unit that converts the DC voltage separated by the signal separation means into a constant voltage and supplies it to the monitor television unit and the second intercom unit; and the sound output from the second intercom unit. It is characterized by comprising a second signal multiplexing means for multiplexing the signal and an appropriate control signal for controlling the outdoor unit and outputting the same to the outdoor unit.

Next, the present invention having the above-described configuration will be explained in detail.

When a visitor presses a call button for the destination from among the group of call buttons on the outdoor unit, an address signal corresponding to the call button is output from the address signal generator. This address signal is multiplexed within the vertical blanking period of the video signal output from the camera unit and output from the address signal multiplexing means. The video signal multiplexed with the address signal is given to the first signal multiplexing means, and the output signal of the first signal multiplexing means is transmitted to the indoor unit via a pair of communication lines. Furthermore, the power supply is driven by the visitor's calling operation, and a DC voltage is superimposed on the communication line.

The multiplexed signal on which the DC voltage is superimposed is separated into a video signal, a DC voltage, etc. by the second signal separation means of each indoor unit. In the address signal detection means of each indoor unit, the address signal is separated from the video signal, and it is determined whether the address signal is an address signal corresponding to the indoor unit.

If the address signal is an address signal corresponding to the indoor unit, the second power supply unit of the indoor unit is driven. The second power supply unit converts the DC voltage separated by the second signal separation means into a constant voltage and supplies it to the monitor television unit and the second intercom unit. When the visiting operator responds to a call from the outdoor unit, the audio signal output from the second intercom unit of the indoor unit is sent to the second signal multiplexer to perform appropriate control for controlling the outdoor unit. It is multiplexed with the signal and transmitted to the outdoor unit side via the pair of signal lines.

Furthermore, the audio signal output from the first intercom unit on the outdoor unit side is multiplexed with the video signal by the first signal multiplexing means and transmitted.

On the other hand, for other indoor units that have not been called by the visitor, the transmitted address signals do not correspond to their own address signals, so the second power supply units of these indoor units are not driven. Therefore, since power is not supplied to the camera units and intercom units of these indoor units, the calls and videos between the visitor and the destination will not be viewed by other indoor units.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram schematically showing the configuration of a doorbell camera system for apartment complexes according to an embodiment of the present invention.

The doorbell camera system for apartment complexes according to this embodiment is as follows:
One outdoor unit 100 installed at the entrance of an apartment complex, and a plurality of indoor units 300 installed in each household in the apartment complex (however, one indoor unit is representatively shown in the figure). , a pair of communication lines I connecting between the outdoor unit lOO and each of the indoor units 300, and a repeater serving as a power supply device that supplies DC power to each of the indoor units 100 via the communication line. It consists of 200.

First, the configuration of the outdoor unit 100 will be explained.

A video signal output from a CCD camera 101 as a camera unit for photographing a visitor is given to a video/address signal multiplexing circuit 102 as address signal multiplexing means. A signal output from the call button group 103 for calling the indoor unit 300 of the visited place is given to the address signal generator 104. The address signal generator 104 is
Generates an address signal corresponding to the call button pressed by the visitor. This address signal is applied to the video/address signal multiplexing circuit 102, and the horizontal/vertical synchronizing signal output from the CCD camera 101 is applied to the address signal multiplexing control circuit 105. Address signal multiplex control circuit 105 is provided to manage the timing for inserting an address signal within the vertical retrace period of the video signal. This address signal multiplex control circuit 105 includes a field start detection circuit i as shown in FIG.
05+, line counter 1osz, parallel-serial conversion n1
05s, gate circuit 105. It is composed of

The output of the video/address signal multiplexing circuit 102 is given to a video FM modulation circuit 106. The output of the video FM modulation circuit 106 is given to a multiplexing/separating circuit 107 as a first signal multiplexing means and a first signal separating means.

The speakers sp, , the microphone M r C+, and the audio circuit 108 constitute an intercom unit of the outdoor unit 100 . The audio circuit 108 FM-modulates the audio signal output from the microphone MIG+ and outputs it to the multiplexing/separating circuit 107, and also demodulates the FM modulated audio signal separated by the multiplexing/separating circuit 107.

The multiplexing/demultiplexing circuit 107 multiplexes the FM modulated video signal given from the video FM modulation circuit 106 and the FM modulated audio signal given from the audio circuit 108 and sends it to the indoor unit 300.
At the same time, the multiplexed signal transmitted from the indoor unit 300 is separated into an FM modulated audio signal and a control signal for controlling the outdoor unit 100.

The control signals include a busy signal and a key signal. The busy signal is a signal for controlling power supply within the outdoor unit 100, and this signal is given to the busy signal detector 109. The output of the busy signal detector 109 is transmitted to the audio circuit 1(]8, the power supply control circuit 110 and the key signal detector 1
11 as a control signal. Power supply control circuit 110
is the call button group 103 and the busy signal detector 1
Based on the output from the outdoor unit 100, the power supply unit 112 that supplies power to various parts such as the CCD camera 101 and the intercom unit in the outdoor unit 100 is controlled. The key signal detector 111 detects the electronic lock 1 at the entrance of the apartment complex where the outdoor unit 100 is installed based on the detection of the key signal.
13 is omitted from the opening/closing system.

Next, the configuration of repeater 200 will be explained.

As shown in FIG. 5, in this embodiment, a repeater 200 is installed on each floor of an apartment complex. Vessel 300. ．． 300°, 300. Supply DC voltage to the communication & IL connected to... Therefore, each repeater 200. , 200z, 200z, . . . need to determine which floor of the indoor unit 300 is being called and output the DC voltage to the communication #IAL of that floor. Therefore, in order to determine the address signal, the repeater 200 uses the FM signals included in the multiplexed signal transmitted from the outdoor unit 100.
A video FM demodulation circuit 201 that demodulates a video signal, and an address signal detector 202 that detects an address signal from the demodulated video signal.

The address signal detector 202, as shown in FIG.
Synchronized board 202. , field start detection circuit 202□
, line counter 2023, serial-parallel converter IPI2
024, detection circuit 202s, comparison circuit 202. , address setter 2o2. It is composed of The output (coincidence signal) of address signal detector 202 is given to power supply unit 203.

The power supply unit 203 outputs a DC voltage to the communication line upon receiving the coincidence signal.

Next, the configuration of the indoor unit 300 will be explained.

A multiplexing/separating circuit 301 connected to the communication line corresponds to a second signal separating means and a second signal multiplexing means. A multiplexing/separating circuit 301 serving as a second signal separating means separates a multiplexed signal on which a DC voltage is superimposed and transmitted via the communication wAL into a video signal, an audio signal, and a DC voltage. The separated FM modulated video signal is given to a video FM demodulation circuit 302. The video signal demodulated by the video FM demodulation circuit 302 is sent to an address signal detector 303 and a liquid crystal display 3Q4 for monitoring the entrance of the apartment complex.
given to.

The address signal detector 303 detects whether the address signal transmitted from the outdoor unit 100 matches the address of the indoor unit 300, and is similar to the address signal detection 202 explained in FIG. It has a configuration. However, the address setting device included in this address signal detector 303 is set with an address corresponding to each indoor unit. The output (coincidence signal) of address signal detector 303 is given to control circuit 305. This control circuit 30
5 has a monitor switch sw1. Hook switch SW2
．． Signals from the key switch SW3 are respectively given. The control circuit 305 controls the indoor unit 300 based on the coincidence signal and the signals from the switches SWI to SW3.
This is a circuit that controls each part of the inside.

Audio circuit 306, speaker SP, ? The input MIC2 constitutes a second intercom unit within the indoor unit 300. The speaker sP2 and the microphone MIC constitute an integrated telephone receiver, and this telephone receiver is set to the funk switch SW2. The FM' modulated audio signal separated by the multiplexing/demultiplexing circuit 301 is converted into an audio signal by the audio circuit 306. Il'J, and this audio signal is output to the speaker sp.

The DC voltage separated by the multiplexing/separating circuit 301 is applied to the power supply unit 307. The power supply unit 307 converts the input DC voltage into a predetermined constant voltage. The power supply control circuit 308 drives and controls the power supply unit 3.7 based on the control signal from the control circuit 3.5. The constant voltage output from this power supply unit 307 is applied to the liquid crystal display 3
04 and the intercom unit.

The busy signal generator 309 receives a control signal from the control circuit 305 and outputs a busy signal for controlling the power supply unit 112 of the outdoor unit 1°O.

Further, the key signal generator 310 outputs a key signal for opening/closing the electronic lock 113 of the outdoor unit 100 by receiving a control signal from the control circuit 305.

The busy word and key signal are applied to a multiplexing/demultiplexing circuit 301 serving as a second signal multiplexing means. This multiplexing/separating circuit 301 multiplexes the busy signal, the key signal, and the FM modulated audio signal from the audio circuit 306 and transmits the multiplexed signal to the outdoor unit 100 side.

FIG. 4 shows the frequency spectra of the video signal, audio signal, address signal, busy signal, and key signal that are multiplexed and transmitted in this embodiment. The audio signals bidirectionally communicated between the outdoor unit 100 and the indoor unit 300 are both FM modulated. Indoor unit 300 to outdoor unit 1
The busy signal and key signal transmitted to 00 are as follows:
It is a carrier of about 0kH2. The video signal on which the address signal is multiplexed is FM modulated and has spectrum components of 2 to 5 MHz.

Next, the operation of the embodiment having the above-described configuration will be explained.

First, the flow of each signal used in this embodiment will be explained according to FIG.

The video signal, audio signal, and address signal multiplexed and transmitted from the outdoor unit 100 are transmitted to the repeater 200 through a pair of communication lines. , zoos... Outdoor unit 10
For example, the address signal transmitted from 0 to 200
．． The indoor units 300, . 300a, 300.・・・
., a DC voltage is superimposed on the multiplexed signal, and the indoor unit 300 . ,300□,3
00. ... will be transmitted to... On the other hand, the voice signal, busy signal, key signal, etc. that are multiplexed and output from the indoor unit 300 that received the call are sent to the outdoor unit 1 via the repeater 200.
00.

The operation of each part will be specifically explained below.

When the visitor presses the call button for the destination in the call button group 103, a predetermined signal is output from the call button group 103 to the power supply control circuit 110. Based on this signal, the power supply control circuit 11O drives the power supply unit 112. As a result, power is supplied to the CCD camera 101, the CCD camera 101 is driven, and a video signal is output to the video/address signal multiplexing circuit 102.

Further, when a call button is pressed by the visitor, the address signal generator 104 outputs an address signal corresponding to the call button to the video/address signal multiplexing circuit 102. Video/address signal multiplexing circuit 102
inserts the address signal into the vertical retrace period of the video signal according to the timing from the address signal multiplex control circuit 105.

Hereinafter, the process of multiplexing the address signal onto the video signal will be explained based on FIG.

In FIG. 6, la) to ld) are explanatory diagrams when an address signal is inserted into an odd field video signal, and (el
~(hl is an explanatory diagram when an address signal is inserted into the video signal of an even field. In the same figure (al, +81 is the video signal waveform of each field, (bl, (fl is the horizontal synchronization signal of each field, ( c) and (g) are the vertical synchronizing signals of each field, ldl, and (hl are the counted values of the horizontal synchronizing signals, respectively).

The video signal output from the CCD camera 101 is NTS
A C signal is used, and the video signal of one frame (one screen) is composed of an odd field video signal and an even field video signal obtained by interlace scanning. Each field consists of 262.5 lines (scan lines). Of these 262.5 lines, 20 lines are the vertical blanking period and do not actually contain any video information. (for odd fields)
Alternatively, address signals can be inserted into 10 lines (in the case of an even field).

Therefore, the number of lines is counted using the synchronization signals HD and VD output from the CCD camera 101, and the 13th to 20th lines of the odd field and the 275th to 282nd lines of the even field are extracted. By inserting the address signal into the video signal, the address signal and the video signal can be multiplexed.

That is, the odd fields 13 to 2 shown in FIG.
For the 8 lines of the 0 line (A-H shown in the same figure) and the 8 lines of the even field 275 to 282 ([-P shown in the same figure) shown in the same figure (bl), 1 line per line. It is possible to carry 8 bits of information per field, that is, 2" = 25
Six addresses can be given. In other words, each household in an apartment complex of 256 households can be identified by such an address signal.

In practice, address signals can be inserted for 10 lines within the vertical retrace period, in this case 21°-1
024 addresses, that is, a maximum of 1024 households. Furthermore, if you use a high Chrono Crate for the ■ line, for example, 5
If a clock rate of MHz or higher is used, it is possible to send 270 bits of information on one line, so even more addresses can be given in such a case.

Hereinafter, referring to FIG. 2, the address signal multiplex control circuit 10
The specific operation of step 5 will be explained.

The horizontal and vertical synchronizing signals HD and VD output from the CCD camera 101 are sent to the field start detection circuit 105. given to. Field start detection circuit 105. is the horizontal/vertical synchronization signal HD.

The first line and the 263rd line, which are field start lines, are detected by VD.

Then, based on this detection signal, the line counter 105
g is reset. As a result, the line counter 10
5! counts horizontal synchronizing signals HD sequentially from the field start, and when the counted value reaches 13 to 20 lines of each field, parallel-to-serial converter 105. send a control signal to. Parallel-to-serial converter 105. The address signal input to is launched by the control signal. The latched address signal is sent to parallel-to-serial converter 105. The signal is sequentially converted into a serial signal in accordance with the horizontal synchronizing signal HD input to the input signal HD, and is outputted, and is applied to the video/address signal multiplexing circuit 102 via the gate circuit 1054. Then, in the video/address signal multiplexing circuit 102, the video signal and the address signal are added and mixed, thereby inserting the address signal into the vertical retrace period of the video signal.

Returning to FIG. 1, the video signal multiplexed with the address signal is applied to the video FM modulation circuit 106 and subjected to FM modulation, and then output to the communication line L via the multiplexing/demultiplexing circuit 107.

The FM modulated video signal transmitted to the repeater 200 via the communication line is taken into the video FM demodulation circuit 201 of the repeater 200. The video signal demodulated by the video FM demodulating subcircuit 201 is applied to an address signal detector 202, where an address signal is detected.

The operation of the address signal detector 202 will be explained below with reference to FIG.

Synchronized board 202. extracts a horizontal synchronizing signal HD and a vertical synchronizing signal VD from the demodulated video signal. These synchronization signals HD and VD are used by the field start detection circuit 202.
By applying □, field start lines (first line and 263rd line) are detected. This detection signal causes line counter 202. It will be paid cents.

This causes line counter 202. counts the horizontal synchronizing signal f (D) sequentially from the field start, and sends a control signal to the serial-parallel converter 2024 when the counted value reaches the 13th to 20th line of each field. The demodulated video signal is given to the detection circuit 202., and the address signal is detected.The detected address signal is sequentially taken into the serial-parallel converter 202. by the control signal from the line counter 2023. The address signals converted into parallel signals are applied to a comparator circuit 202.

Comparison circuit 202. is the address signal and the address preset in the address setter 202) (the relay device 2).
Indoor unit 300 installed on the floor where 00 is in charge of power supply
), a match signal is output. When this coincidence signal is applied to the power supply unit 203 shown in FIG. 1, the power supply unit 203 is driven, and a DC voltage is outputted to the communication line.

In this way, a signal in which a DC voltage is superimposed on the FM modulated video signal output from the outdoor unit 100 is transmitted to the indoor unit 300.

The FM modulated video signal on which the DC voltage is superimposed is sent to the indoor unit 30.
The multiplexing/separating circuit 301 of No. 0 separates the signal into an FM modulated video signal and a DC voltage. This FM modulated video signal is demodulated into a video signal by an FM demodulation circuit 302. This video signal is given to address signal detector 303. Address signal detector 303 detects an address signal by the same operation as explained in FIG. If the transmitted address signal matches the address of the indoor unit 300, a match signal is output to the control circuit 305. As a result, the control circuit 305 outputs a control jn signal to the power supply control circuit 308. Power supply control circuit 308 drives power supply unit 307 using this control signal. This results in
Power is supplied to the liquid crystal display 304 and intercom unit of the indoor unit 300.

On the other hand, the control circuit 305 that has been given the coincidence signal outputs a control signal to the audio circuit 306. As a result, the audio circuit 3
06 outputs a ringing tone from the speaker S P z. When the operator at the destination who has responded to the ringing tone presses the monitor switch SWI, the liquid crystal display 304 is driven by a control signal from the control circuit 305 and an image of the visitor is displayed on the liquid crystal display 304.

Furthermore, when the visiting operator picks up the receiver of the intercom unit 7, hook switch SW2 turns ON.
become a state. As a result, the control circuit 305 outputs a wl<8 signal to the busy signal generator 309, and the busy signal generator 309 outputs a busy signal. This busy signal is given to the multiplexing/separating circuit 301 and further transmitted to the outdoor unit 100 via the communication line. When the handset is picked up, a control signal is output from the control circuit 305 to the audio circuit 306, and the audio circuit 306 becomes ready for communication. That is, the audio signal output from the microphone MrC is subjected to FM modulation in the audio circuit 306, is applied to the multiplexing/demultiplexing circuit 301, is multiplexed with other control signals, and is transmitted to the outdoor unit 100 side.

The busy signal transmitted to the outdoor unit 100 is given to a busy signal detector 109 via a multiplexing/separating circuit 107.

When the busy signal detector 109 detects a busy signal, the busy signal detector 109 gives a control signal to maintain operation to the 'FX*\J control circuit 110, and also controls the audio circuit 108 and key signal detector 111. A control signal for driving is given.

When the audio circuit 108 is activated, the audio signal included in the multiplexed signal transmitted from the indoor unit 300 is separated by the multiplexing/demultiplexing circuit 107, and then the audio signal is separated by the multiplexing/separating circuit 107.
8 and is FM demodulated and output to speaker SP. Further, the audio signal output from the microphone MIC is FM modulated in the audio circuit 108, further multiplexed with a video signal in the multiplexing/separating circuit 107, and transmitted to the indoor unit 300 side. The audio signal is separated by the multiplexing/demultiplexing circuit 3017 of the indoor unit 300, then FM demodulated by the audio circuit 306 and outputted to the speaker SP. In this way, simultaneous communication is performed between the outdoor unit 100 and the indoor unit 300.

When the visiting operator presses the key switch SW3, a control signal is output from the control n circuit 305 to the key signal generator 310, and the key signal is multiplexed with an audio signal and the like and transmitted to the outdoor unit 100. This key signal is separated by the multiplexing/dividing M circuit 107 of the outdoor unit 100 and then sent to the key signal detector 1.
11, the electronic lock 113 at the entrance to the apartment complex is opened by a control signal from the key signal detector 111.

By the way, the operator at the place I visited was using the monitor switch SW.
After pressing I and checking the visitor on the liquid crystal display 304, the user may not want to talk to the visitor. In such cases, unless the operator picks up the handset,
Since the busy signal is not output, the audio circuit 108 of the outdoor unit 100 does not operate, so it is possible to avoid talking to visitors.

The power supply control circuit 110 of the outdoor unit 100 has a built-in simple timer. If a busy signal is not detected within a certain period of time after the address signal is issued from the outdoor 1100,
The timer resets the calling operation of the outdoor unit 100 and returns the outdoor unit 100 to a standby state. This applies if the person you are visiting is away from home or if you avoid talking to the visitor (
This is to prevent the busy signal from being returned to the outdoor unit 100 and the system from continuing to be occupied unnecessarily if the user is not at home).

On the other hand, the indoor unit 100 that is not called by the visitor
Regarding the transmitted address signal and its indoor unit 3
Since the address of 00 does not match, the indoor unit 300
Since the power supply unit 307 is not driven, calls and videos between the visitor and the destination will not be viewed by other indoor units.

As described above, when a DC voltage is superimposed on the multiplexed signal and transmitted to the indoor unit 300, power loss can be reduced compared to when a constant current is superimposed. However, the length of the communication line from the repeater 200 to the indoor unit 300 differs depending on the installation location of the indoor unit 300. Therefore, since the DC resistance of the communication line changes for each indoor unit 300,
The voltage drop of the DC voltage supplied to each indoor unit 300 also differs. Therefore, if the DC voltage of the repeater 200 is set in consideration of the maximum voltage drop, the
The disadvantage is that the power loss in the source unit 307 increases.

Therefore, in order to supply the optimum DC voltage according to each indoor unit 300, the following configuration is adopted in this embodiment.

FIG. 7 is a block diagram showing specific configurations of the power supply unit 2o3 of the repeater 200 and the power supply unit 3o7 of the indoor unit 300.

The power supply unit 203 of the repeater 200 includes a variable constant voltage regulator 203. connected to the communication line via a choke coil L. And this variable constant voltage regulator 203+
Balanced/unbalanced converter 203N, bandpass filter '9203s, audio FM demodulation circuit 203. , a low-pass filter 203%, a frequency-power conversion circuit 203, and a voltage control circuit 203. It is made up of spikes.

On the other hand, the power supply unit 307 of the indoor unit 300 is connected to a constant voltage regulator 307. and a voltage controlled oscillator 307. for detecting the input voltage level of the constant voltage regulator 3.7I. and a low-pass filter 3o7°. Low pass filter 3
o7° is connected to the FM modulation section of the audio circuit 306.

Next, the operation of the embodiment shown in FIG. 7 will be explained.

The multiplexed signal on which the DC voltage has been superimposed and which has been transmitted to the indoor unit 300 passes through the choke coil L2, thereby blocking high frequency components, and converting the DC voltage into the constant voltage regulator 3o7. supplied to

The voltage controlled oscillator 307t oscillates at a frequency depending on the level of the DC voltage. As this oscillation frequency, a frequency sufficiently lower than that of voice is used in order to multiplex it with the voice signal. The oscillation signal of the voltage controlled oscillator 307□ is passed through the low-pass filter 3o7. to the audio circuit 306 via F
M modulated. The FM-modulated oscillation signal is multiplexed with the audio signal and other control signals and transmitted to the repeater 200.

The transmitted multiplexed signal is sent to a balanced/unbalanced converter 203□
, bandpass filter 203. The oscillation signal is taken into the power supply unit via the audio FM demodulation circuit 2034, and is demodulated by the audio FM demodulation circuit 2034. The demodulated oscillation signal is passed through a low-pass filter 203. Frequency-voltage conversion circuit 203 via
h and is converted into a voltage signal. This voltage signal is supplied to the voltage control circuit 203. The DC output voltage level of the variable constant voltage regulator 203I is controlled by being applied to the variable constant voltage regulator 2031 via the variable constant voltage regulator 203I. That is, when the level of the receiving end voltage of the constant voltage regulator 307I of the indoor unit 300 is high, the variable constant voltage regulator 2
By controlling the output voltage level of constant voltage regulator 307 .
The receiving end voltage of the constant voltage regulator 307 is controlled to an optimum level and power loss is suppressed.
．． The output voltage level of the variable constant voltage regulator 2031 of the repeater 200 is controlled by detecting the receiving end voltage of the variable constant voltage regulator 2031 of the repeater 200. As shown in FIG. It can also be controlled by That is, constant voltage regulator 307
．． The thermoelectric converter 3074 converts the temperature rise due to heat generation into a voltage signal, converts the frequency of this in the same manner as shown in FIG. 7, and transmits the FM modulated signal to the repeater 200 together with the audio signal.

In addition, in the description of the above-mentioned embodiment, the outdoor unit 100 was explained as being equipped with the electronic lock 111, but the present invention does not necessarily require this. Needless to say, it can also be applied to systems.

In addition, in the description of the embodiment, the indoor unit 300 detects the address signal and the power supply unit 307 is driven, and then the monitor liquid crystal display 304 etc. are displayed only after the handset is picked up and the Fukusinochi SW2 is turned on. Power was supplied. However, power may be supplied to the liquid crystal display or the like at the same time as the address signal is detected.

Furthermore, in the above embodiment, the audio circuit 10B of the outdoor unit 100 is configured to operate based on the busy signal transmitted from the indoor unit 300, but this
Similarly to the CD camera 101, the camera may be powered and driven by pressing a call button.

Furthermore, in the above embodiment, the repeater 200 is interposed between the outdoor unit 100 and the indoor unit 300, but this is because the outdoor unit 100 and the indoor unit 300 are separated by a considerable distance. This is because power loss due to communication lines was taken into account. Therefore, when the outdoor unit 100 and the indoor unit 300 are relatively close to each other, the repeater 200 may be configured to be included in the outdoor unit 100 to supply power to the indoor unit 300.

(Effects of the Invention) As is clear from the above explanation, the doorbell camera system for apartment complexes according to the present invention has a combination of an outdoor unit installed at the entrance of the apartment complex and an indoor unit installed in each household of the apartment complex. Since communication between the two is performed using multiplexed signals, a pair of communication lines can be used as the signal transmission line. Therefore, according to the present invention, there is no need to lay a composite cable as in the conventional example, so that the doorbell camera system for apartment complexes can be easily installed. This is especially convenient for apartment complexes that already have intercom equipment installed, as the existing communication lines can be used as is and expanded to a doorbell camera system.

In addition, the present invention superimposes DC power on the communication line using the power supply and supplies power to the indoor unit all at once, so there is no need to connect a power cable to each indoor unit. The installation cost of the doorbell camera system for apartment complexes can be further reduced.

Furthermore, according to the present invention, a specific indoor unit is called by an address signal corresponding to each indoor unit, and only when the address signal is detected by the indoor unit, power is supplied to the monitor TV unit or intercom unit, and the visitor is informed. It is possible to communicate with. Therefore, according to the present invention, other indoor units that are not called by the outdoor unit cannot eavesdrop on the conversation or video between a visitor and a specific indoor unit, so that it is possible to maintain the secrecy of the call. It is convenient.

Furthermore, since the present invention inserts an address signal for calling each indoor unit within the vertical retrace period of the video signal output from the camera unit of the outdoor unit, even if the number of addresses increases, the video signal remains unchanged. It does not interfere with the beat.

Furthermore, in the present invention, since DC power is supplied to the indoor unit using DC voltage, power loss can be reduced compared to when power is supplied using constant current.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing the configuration of a door intercom camera system for apartment complexes according to an embodiment of the present invention, and FIG. 2 shows a specific configuration of the address signal multiplex control circuit 105 shown in FIG. 1. FIG. 3 is a block diagram showing the specific configuration of the address signal detector in the repeater 200 and indoor unit 300 shown in FIG. 1, and FIG. 4 shows the frequency spectrum of each signal in the embodiment. Distribution map, 5th
The figure is an explanatory diagram showing the flow of each signal in the embodiment.
FIG. 7 is a block diagram showing the specific configuration of each power supply unit of the repeater 200 and the indoor unit 300 in the embodiment. The figure shows another embodiment of the power supply unit of the indoor unit 300. 100...Outdoor unit, 101...CCD camera, 10
2... Video/address signal multiplex circuit, 103... Call button group, 104... Address signal generator, 1
07... Multiplexing/separating circuit, 108... Audio circuit, 2
00...Repeater, 203...Power supply unit, 300
... Indoor unit, 301 ... Multiplexing/separating circuit, 303.
...Address signal detector, 304...Liquid crystal display, 3゜5...Control circuit, 306...Audio circuit, 3
07...Power supply unit, L...Communication line.

Claims (2)

[Claims] (1) An outdoor unit installed at the entrance of the apartment complex, a plurality of indoor units installed in each household of the apartment complex, and a pair of communication lines connecting the outdoor unit and each indoor unit. ,
a power supply device that supplies DC power to each of the indoor units via the communication line; 1 intercom unit, a group of call buttons for calling the indoor unit at the visitor's destination, an address signal generator that generates an address signal corresponding to the call button pressed by the visitor, and an image output from the camera unit. address signal multiplexing means for multiplexing the address signal within the vertical retrace period of the signal; and address signal multiplexing means for multiplexing the address signal with the video signal multiplexed with the address signal and the audio signal output from the first intercom unit. a first signal multiplexing means for outputting the signal to the first intercom unit; and a first signal separating means for separating the audio signal from the multiplexed signal transmitted from the indoor unit and applying it to the first intercom unit; The device includes a first power supply unit that superimposes a DC voltage on the communication line based on a calling operation of the outdoor unit, and each of the indoor units receives power from the outdoor unit and the power supply via the communication line. a second signal separating means for separating the multiplexed signal on which the transmitted DC voltage is superimposed into a video signal, an audio signal, and a DC voltage; a monitor television unit to which the video signal is applied; and a monitor television unit to which the audio signal is applied. Second
an intercom unit, an address signal detection means for separating an address signal from the video signal and detecting whether or not the address signal is an address signal corresponding to the indoor unit; By detecting the address signal corresponding to the second
a second power supply unit that converts the DC voltage separated by the signal separation means into a constant voltage and supplies it to the monitor television unit and the second intercom unit; and the sound output from the second intercom unit. A door intercom camera system for an apartment complex, comprising a second signal multiplexing means for multiplexing a signal and an appropriate control signal for controlling the outdoor unit and outputting the same to the outdoor unit. (2) A first power supply unit included in the power supply device includes a variable constant voltage regulator and a voltage control means for controlling an output voltage level of the variable constant voltage regulator, the voltage control means , information related to the DC voltage level supplied to the second power supply unit of the indoor unit is given from the indoor unit via the communication line, thereby adjusting the output voltage level of the variable constant voltage regulator to an appropriate level. 2. A door intercom camera system for an apartment complex according to claim 1, wherein the door intercom camera system is controlled to a voltage level.