JP4629932B2 - Apartment house intercom system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intercom system for apartment houses in which a video relay amplifier is installed.
[0002]
[Prior art]
FIG. 5 shows a video system of a general apartment house intercom system. 1 is a balanced wire, 10 is a camera unit, 20 is a video control device, 30 is a video relay amplifier, 40 is a dwelling unit monitor, 50 is a branching device, and 90 is a multi-building video control device.
[0003]
First, a case where a visitor visits a common entrance will be explained. A visitor calls a person in the visited dwelling unit by operating a lobby interphone (not shown) provided at the common entrance. At this time, the visitor is photographed by the camera unit 10 provided in the lobby intercom, and the photographed image is displayed on the dwelling unit monitor 40. This operation example will be specifically described with reference to FIG. There are a plurality of common entrances, and a camera unit 10 is provided for each place.
First, the video control device 20 that has received a control signal from a central control device (not shown) of the interphone selects and drives the camera unit 10 provided in the lobby intercom that has been called. The video control device 20 amplifies the video signal from the selected camera unit 10 and sends it to the dwelling monitor 40. Then, the in-unit monitor 40 that receives the control signal from the interphone central control device after receiving the call from the lobby interphone receives the video signal via the branching unit 50, and the image of the selected camera unit 10 is displayed in the dwelling unit. It is displayed on the monitor 40.
[0004]
6, 7, and 8 show the internal blocks of the camera unit 10, the video control device 20, and the dwelling unit monitor 40, respectively. 6, 10a to 14 are internal blocks of the camera unit 10, 10a is a camera output terminal, 11 is a low pass filter, 12 is a constant voltage generator, 13 is a CCD camera unit, and 14 is a video signal modulator. 7, 20a to 27 are internal blocks of the video control apparatus 20, 20a is a monitor output terminal, 20b is a camera input terminal, 20c is a commercial power supply terminal, 20d is a control input terminal, 21 is a line switching unit, 22 Is a video signal generator, 23 is a high-pass filter, 24 is an amplifier, 25 is an output buffer, 26 is a controller, and 27 is a constant voltage generator. Further, in FIG. 8, reference numerals 40 a to 45 are internal blocks of the dwelling unit monitor 40. Reference numeral 40a is a monitor input terminal, 41 is a low-pass filter, 42 is a constant voltage generator, 43 is a high-pass filter, 44 is a demodulator, and 45 is a display.
[0005]
The video control device 20 creates a driving power source inside the video control device 20 from the commercial power supply terminal 20 c via the constant voltage generator 27. The control unit 26 that receives a control signal from the central control unit of the interphone via the control input terminal 20d selects the camera unit 10 of the lobby intercom that the visitor has called by the line switching unit 21, and monitors the dwelling unit. The output buffer 25 for sending the video signal to 40 is made available.
[0006]
The camera unit 10 selected by the line switching is supplied with power from the camera output terminal 10a via the balanced wire 1 from the constant voltage generation unit 27 of the video control device 20, passes through the low-pass filter 11, and is then charged into the CCD by the constant voltage generation unit 12. An internal power supply for driving the camera unit 13 and the video signal modulation unit 14 is created (see FIG. 6). The CCD camera unit 13 converts the scenery captured by the CCD and the video of the visitor into an electrical signal, and the video signal modulation unit 14 modulates the signal output from the CCD camera unit 13 to a narrow occupied frequency. For example, FM modulation or AM modulation. The modulated electrical signal (hereinafter referred to as a video signal) is superimposed and output to the balanced wire 1 supplied with power from the video control device 20 via the camera output terminal 10a. As described above, the video power superimposed signal in which the video signal is superimposed on the power source is transmitted to the balanced wire 1 between the camera unit 10 and the video control device 20 and the other balanced wires 1.
[0007]
The video signal from the camera unit 10 is output to the video signal creation unit 22 of the video control device 20 via the camera input terminal 20b. The video signal creation unit includes a high-pass filter 23 and an amplification unit 24, and the high-pass filter 23 separates the video signal superimposed on the power source. The amplifying unit 24 amplifies the video signal attenuated by the balanced wire 1. The amplified video signal is output from the output buffer 25 and is superimposed again on the driving power source output from the constant voltage generator 27, and the branching device 50 and the dwelling unit monitor are connected via the balanced wire 1 (and the monitor output terminal 20a). 40. As described above, the power source of the dwelling unit monitor 40 is supplied from the video control device 20.
[0008]
When the visitor operates the lobby intercom and selects a dwelling unit to be visited, the selected dwelling unit monitor 40 is connected to the video controller 20 via the balanced wire 1 via the balanced wire 1. The video signal superimposed on the power supply is received. The branching device 50 branches the line while matching the impedance of the video signal, and does not directly affect the operation of the system. In the dwelling unit monitor 40 of FIG. 8, the power source is separated from the video power superimposed signal input from the monitor input terminal 40a by the internal low-pass filter 41, and the constant voltage generation unit 42 supplies power for driving the demodulation unit 44 and the display unit 45. create. The video signal separated by the high-pass filter 43 is returned to the original signal by the demodulator 44, and the display unit 45 displays a screen based on the signal.
[0009]
The dwelling unit monitor 40 is supplied with power and a video signal from the video control device 20 via the balanced wire 1, but when the line length of the balanced wire 1 is increased, the attenuation of the video signal increases, Demodulation of video signals becomes difficult. Therefore, when the line length becomes long, the output of the video control device 20 is input to the video relay amplifier 30, and after the video signal is amplified again, it is input to the dwelling unit monitor 40 (see the upper right part of FIG. 5).
[0010]
FIG. 9 is a block diagram of a conventional video relay amplifier 30. 30a is a monitor output terminal, 30b is a signal input terminal, 30c is a commercial power supply terminal, 31 is a high-pass filter, 32 is an amplifier, 33 is a constant voltage generator, and 34 is an output buffer.
[0011]
The video relay amplifier 30 drives the amplifying unit 32 and the output buffer 34 from the commercial power supply terminal 30c by the constant voltage generating unit 33, and further generates a driving power source for driving the dwelling unit monitor 40. The video signal superimposed on the power source sent from the video control device 20 and input from the signal input terminal 30b is separated from the power source voltage by the high-pass filter 31, and the separated video signal is amplified by the amplifying unit 32. The amplified video signal is superimposed again on the drive power source created by the constant voltage generator 33 via the output buffer 34 and output to the dwelling unit monitor 40.
[0012]
[Problems to be solved by the invention]
Since the video relay amplifier 30 in the form of FIG. 9 is driven by a commercial power supply, a large amount of power can be used. For this reason, the balanced wire 1 can be connected to many dwelling unit monitors 40 by increasing the number of the output buffers 34.
[0013]
However, when the system is installed in an actual apartment house, the number of dwelling units with insufficient track length is not so large, and the necessity of connecting a large number of dwelling unit monitors to an amplifier is low. In addition, the place where commercial power can be secured in the apartment is limited, so it was necessary to carefully select the installation location.
[0014]
Moreover, in the form of FIG. 9, only the line length between the video control apparatus 20 and the dwelling unit monitor 40 can be extended, and it cannot be handled when the line length between the camera unit 10 and the video control apparatus 20 is insufficient. was there.
[0015]
In addition, when the housing complex is composed of a plurality of buildings, a video control device 20 is installed in each building, and a multi-building video control device 90 that sends video signals to the video control device 20 in each building is installed ( (See the lower left part of FIG. 5). The line length between the video control devices naturally becomes longer because the buildings are connected to each other, but the video relay amplifier having the configuration shown in FIG. 9 is limited in places where commercial power can be secured, so it is difficult to secure the installation location. There was a problem.
[0016]
[Means for Solving the Problems]
In view of the above, the present invention can confirm a visitor who has visited a common entrance from a monitor in a dwelling unit using a camera unit provided in a lobby intercom, and a video signal is supplied to the power source of the camera unit and the power supply of the dwelling unit monitor. In a collective housing intercom system that superimposes and transmits a video power superimposed signal with a pair of balanced wires, the power is output to the camera unit of the lobby intercom, and the video signal output by the camera unit superimposed on the power is input. A video control amplifier, and a video relay amplifier that is provided between the video control device and the camera unit and amplifies and relays the video signal using the power source of the video power superimposed signal, A power source creation unit that creates a DC or low frequency power source from which a video signal is removed by removing a high frequency component from the video power source superimposed signal, and a video power source A video signal creation unit that removes a low-frequency component from the tatami signal and extracts the video signal, and amplifies the video signal to a predetermined voltage level, and the power source created by the power supply creation unit is output from the camera unit The video signal is superimposed on a video signal and supplied to the camera unit, and the video signal created by the video signal creation unit is superimposed on a power source output from the video control device and output.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described. In addition, the same code | symbol is attached | subjected to the part same as a prior art, and description is abbreviate | omitted. FIG. 1 is a block diagram showing a first embodiment of a video relay amplifier 70 of the present invention. 70a is a signal input terminal, 70b is a monitor output terminal, 71 is a backflow prevention unit, 72a to 72b are low pass filters, 73 is a rectification unit, 74 is a constant voltage generation unit, 75 is a high pass filter, 76 is an amplification unit, and 77 is a power supply A creation unit 78 is a video signal creation unit.
[0018]
The video relay amplifier 70 is installed between the video control device 20 and the dwelling monitor 40, and receives a video power superimposed signal sent from the video control device 20 (see FIG. 3).
[0019]
The power supply creating unit 77 removes the high frequency component of the video power superimposed signal input from the video control device 20 via the signal input terminal 70a and creates a DC or low frequency power source from which the video signal is removed. That is, the video power superimposed signal input from the video control device 20 is rectified by the rectifier 73, smoothed by the low pass filter 72a, and then supplied to the dwelling monitor 40 via the backflow prevention unit 71 which is a protection circuit. To do. The power source from which the video signal has been removed by the low-pass filter 72 b creates an internal driving power source by the constant voltage generation unit 74 and supplies it to the amplification unit 76. The video signal creation unit 78 removes the low frequency component from the video power supply superimposed signal, extracts the video signal, and amplifies the video signal to a predetermined voltage level. That is, the high-pass filter 75 separates the video signal from the video power superimposed signal, and the amplification unit 76 amplifies the video signal attenuated due to the influence of the balanced wire 1. Then, the power source created by the power source creating unit 77 and the video signal created by the video signal creating unit 78 are superimposed again by a superimposing unit (not shown), and output to the dwelling unit monitor 40 via the monitor output terminal 70b.
[0020]
Next, FIG. 2 shows a second embodiment of the video relay amplifier 60 of the present invention. 60a is a signal output terminal, 60b is a camera input terminal, 61 is a backflow prevention unit, 62a to 62b are low pass filters, 63 is a rectification unit, 64 is a constant voltage generation unit, 65 is a high pass filter, 66 is an amplification unit, and 67 is a power supply A creation unit 68 is a video signal creation unit.
[0021]
The video relay amplifier 60 is installed between the video control device 20 and the camera unit 10 (see FIG. 3), and the power sent from the video control device 20 is input from the signal output terminal 60a, and the video signal from the camera unit 10 is received. Are input from the camera input terminal 60b. The power supplied from the video control device 20 is output to the camera unit 10 of the lobby intercom. Then, the camera unit 10 outputs the video signal to the video control device 20 while being superimposed on the power source.
[0022]
The power generation unit 67 of the video relay amplifier 60 generates a direct current or low frequency power source from which the high frequency component is removed and the video signal is removed. That is, the power input from the video controller 20 is rectified by the rectifier 63 and smoothed by the low-pass filter 62a, and then the power is supplied to the camera unit 10 via the backflow prevention unit 61 which is a protection circuit. Further, the video power superimposed signal rectified by the rectifier 63 creates an internal driving power by the constant voltage generator 64 through the low-pass filter 62b. The video signal creation unit 68 removes the low frequency component from the video power supply superimposed signal, extracts the video signal, and amplifies the video signal to a predetermined voltage level. That is, the video power superimposed signal is separated from the video signal by removing the DC or low frequency power supply voltage by the high-pass filter 65, and the video signal attenuated by the influence of the balanced wire 1 is amplified by the amplifier 66.
[0023]
Then, the power source created by the power source creation unit 67 is superimposed on a video signal sent from the camera unit 10 by a superimposition unit (not shown), and is output to the camera unit 10 via the camera terminal 60 b and created by the video signal creation unit 68. The video signal is superimposed on the power source output from the video control device 20 via the signal output terminal 60a and output to the video control device 20.
[0024]
Next, a third embodiment of the video relay amplifier 80 of the present invention is shown in FIG. 80a is a signal input terminal, 80b is a signal output terminal, 81 is a function selection switch, 81a and 81b are switches, 82 is a power generation unit, 83 is a video signal generation unit, 84 is a rectification unit, 85a to 85b are low-pass filters, 86 Is a backflow prevention unit, 87 is a constant voltage generation unit, 88 is a high-pass filter, and 89 is an amplification unit.
[0025]
The video signal creation unit 83 extracts the video signal from the video power superimposed signal input from the signal input terminal 80 a by separating it from the power supply voltage by the high pass filter 88, and the video signal attenuated by the influence of the balanced wire 1 by the amplification unit 89. Amplify. The power generation unit 82 rectifies the input power by the rectification unit 84, smoothes it by the low-pass filter 85a, and then generates the power through the backflow prevention unit 86 that is a protection circuit. Further, the power source rectified by the rectifying unit 84 generates an internal driving power source for driving the video signal generating unit 83 and the like by the constant voltage generating unit 87 through the low pass filter 85b.
[0026]
A function selection switch 81 is provided for input and output to the power generation unit 82. A function for switching the switch to input power from the signal input terminal 80a and sending power to the signal output terminal 80b, Two functions of inputting power from the output terminal 80b side and sending power to the signal input terminal 80a side can be selected.
[0027]
The function selection switch 81 includes a switch 81a and a switch 81b that are switched in conjunction with each other. Here, when the switches 81a and 81b are connected to the contacts A and C and the function of inputting the power from the signal input terminal 80a and sending the power to the signal output terminal 80b is selected, the power generation unit 82 is selected. The power source created in step 1 and the video signal created by the video signal creation unit 83 are superimposed, and the configuration is the same as in the first embodiment. That is, the same function as the video relay amplifier 70 installed between the video control device 20 and the dwelling monitor 40 is provided.
Further, when the switch 81a, 81b is connected to the contacts B, D and the function of inputting power from the signal output terminal 80b and sending power to the signal input terminal 80a is selected, the power generator 82 The generated power output and the input video signal are superimposed, and the video signal generated by the video signal generating unit 83 and the input power supply are superimposed, which is the same form as the second embodiment. . That is, the same function as the video relay amplifier 60 installed between the video control device 20 and the camera unit 10 is provided.
[0028]
FIG. 3 is a system configuration example using the video relay amplifier of the present invention. In addition, the same code | symbol is attached | subjected to the part same as a prior art example, and description is abbreviate | omitted.
[0029]
When the video relay amplifier 70 according to the first embodiment of the present invention is used, the line length between the video control device 20 and the dwelling unit monitor 40 can be extended without supplying commercial power.
Further, if the multi-building video control device 90 is connected instead of connecting the video control device 20 of the first embodiment, and the video control device 20 is connected instead of connecting the dwelling monitor 40, the video control device The line length can be extended without supplying commercial power.
[0030]
When the video relay amplifier 60 according to the second embodiment of the present invention is used, the line length between the video control device 20 and the camera unit 10 can be extended without supplying commercial power.
[0031]
When the video relay amplifier 80 of the third embodiment of the present invention is used, the line length between the video control device 20 and the dwelling monitor 40 is extended, the line length between the video control devices is extended, the video control device 20 and the camera unit. Any of the line lengths of 10 can be performed without supplying commercial power.
[0032]
Further, the video relay amplifier of the present invention can further extend the line length by amplifying the signal amplified by the video relay amplifier again by the video relay amplifier by connecting a plurality of video relay amplifiers as shown in FIG. Is possible. In particular, since the line length between the multi-building video control device 90 and the video control device 20 of each building is often long, it is effective to provide a plurality of video relay amplifiers 70 between them.
[0033]
【The invention's effect】
As described above, according to the first embodiment of the present invention, since the video signal is amplified and relayed using the power source of the video power superimposed signal, the video control device and the dwelling unit are supplied without supplying commercial power. The line length with the monitor can be extended, and the line length between the video control devices can also be extended. According to the second aspect of the present invention, the line length between the video control device and the camera unit can be extended without supplying commercial power. Further, if the video relay amplifier is provided with a function selection switch in the equipment of the video relay amplifier, and the function of the first embodiment and the second embodiment of the present invention can be switched by switching the switch, It can be used for any of the line extension between the camera unit and the video control apparatus, the line extension between the dwelling unit monitor and the video control apparatus, and the line extension between the video control apparatuses.
[0034]
According to the present invention, since a commercial power source is not required, there is an advantage that the installation location can be easily selected and the system facility design can be facilitated.
[Brief description of the drawings]
FIG. 1 shows an internal block of a first embodiment of a video relay amplifier according to the present invention.
FIG. 2 shows an internal block of a second embodiment of the video relay amplifier according to the present invention.
FIG. 3 shows a system example of a multi-building system of video relay amplifiers according to the present invention.
FIG. 4 shows an internal block of a third embodiment of the video relay amplifier according to the present invention.
FIG. 5 shows an example of a video system of a conventional apartment house intercom system.
FIG. 6 shows an internal block of a camera unit in the lobby intercom.
FIG. 7 shows an internal block of the video control apparatus.
FIG. 8 shows an internal block of a dwelling unit monitor.
FIG. 9 shows an internal block of a conventional video relay amplifier.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Balance wire 10 Camera unit 10a in lobby intercom Camera output terminal 11 Low pass filter 12 Constant voltage generation part 13 CCD camera part 14 Video signal modulation part 20 Video control apparatus 20a Monitor output terminal 20b Camera input terminal 20c Commercial power supply terminal 20d Control input Terminal 21 Line switching unit 22 Video signal creation unit 23 High pass filter 24 Amplification unit 25 Output buffer 26 Control unit 27 Constant voltage generation unit 30 Conventional video relay amplifier 30a Monitor output terminal 30b Signal input terminal 30c Commercial power supply terminal 31 High pass filter 32 Amplification Unit 33 constant voltage generating unit 34 output buffer 40 dwelling unit monitor 40a monitor input terminal 41 low pass filter 42 constant voltage generating unit 43 high pass filter 44 demodulating unit 45 display unit 50 branching device 60 in the video of the second embodiment of the present invention Amplifier 60a Signal output terminal 60b Camera input terminal 61 Backflow prevention unit 62a to 62b Low pass filter 63 Rectifier 64 Constant voltage generator 65 High pass filter 66 Amplifier 67 Power supply generator 68 Video signal generator 70 In the first embodiment of the present invention Video relay amplifier 70a Signal input terminal 70b Monitor output terminal 71 Backflow prevention unit 72a to 72b Low-pass filter 73 Rectification unit 74 Constant voltage generation unit 75 High-pass filter 76 Amplification unit 77 Power supply creation unit 78 Video signal creation unit 80 Video relay amplifier 80a signal input terminal 80b signal output terminal 81 function selection switch 81a sw1
81b sw2 82 Power supply generation unit 83 Video signal generation unit 84 Rectification units 85a to 85b Low pass filter 86 Backflow prevention unit 87 Constant voltage generation unit 88 High pass filter 89 Amplification unit 90 Multi-building video control device

Claims (2)

Visitors who have visited the common entrance can be confirmed from the monitor in the dwelling unit using the camera unit installed in the lobby intercom, and the video signal is superimposed on the power supply of the camera unit and the monitor in the dwelling unit, and video is displayed with a pair of balanced wires. In an apartment intercom system that transmits a power superimposed signal,
A video control device that outputs power to the camera unit of the lobby intercom, and receives a video signal output by the camera unit superimposed on the power;
A video relay amplifier that is provided between the video control device and the camera unit, amplifies a video signal using a power source of the video power superimposed signal, and relays the video signal;
The video relay amplifier is
A power source creating unit that creates a DC or low frequency power source from which the video signal is removed by removing a high frequency component from the video power source superimposed signal;
A video signal creating unit that removes a low-frequency component from the video power supply superimposition signal to extract a video signal and amplifies the video signal to a predetermined voltage level;
The power source created by the power source creation unit is superimposed on the video signal output from the camera unit and supplied to the camera unit, and the video signal created by the video signal creation unit is supplied to the power source output from the video control device. Apartment house intercom system characterized by superimposing output. The video relay amplifier includes a function selection switch, and a signal input terminal and a signal output terminal connected to the function selection switch.
The function selection switch inputs power from the signal input terminal and sends power to the signal output terminal; and inputs power from the signal output terminal and sends power to the signal input terminal 2. The collective housing intercom system according to claim 1, wherein a function to be switched is switched .

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