JP2005136905A - Interphone system and signal relay apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily construct at low cost an interphone system wherein a transmission line for a television joint reception system can be utilized to transmit audio signals and video modulation signals. <P>SOLUTION: A multiple dwelling interphone control apparatus 13 and a terminal 10a in a multiple dwelling entrance facility 11 are connected via a multiple dwelling adapter 12, to transmit various signals from the multiple dwelling interphone control apparatus 13 via a transmission line L to each of individual houses. A living room interphone device 22 and a terminal 8a are connected by a house adapter 21, to transmit various signals from the living room interphone device 22 via the transmission line L and the multiple dwelling adapter 12 to the multiple dwelling entrance facility 11. Namely, even in a house where an interphone system without video modulation signal transmission wiring is provided, only by newly providing at least the adapters and a monitoring device 27, the interphone system with a monitoring function can be constructed easily at a low cost. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an interphone system using a transmission line for joint television reception in a building, and a signal relay device used in this system.

  Conventionally, in apartment houses such as apartments and apartments, the reception signal from the receiving antenna for receiving radio waves installed on the roof is usually connected to the terminal terminal of each dwelling unit via a transmission line wired in the building. A television co-reception system for transmission (so-called in-building CATV system) has been established.

  Therefore, as an interphone system that uses this TV joint reception system, a TV joint built in the apartment house between the apartment entrance facilities in the apartment house and the living room master unit (room intercom device) installed in each unit. A system in which a resident in a dwelling unit can communicate with a visitor while visually confirming the visitor by transmitting an audio signal and a video modulation signal using a transmission line for a receiving system (hereinafter, “ Also known as “TV intercom system” (see, for example, Patent Document 1).

  In this TV intercom system, the audio signal from the collective entrance facility is modulated into a band that is not used as a broadcast channel signal (hereinafter referred to as “TV signal”) received by various receiving antennas in the TV joint reception system. It is transmitted together with the modulation signal to the home unit of each dwelling unit through a transmission line such as a coaxial cable. Similarly, the audio signal from the room master is modulated to a band that is not used as a television signal, and transmitted to the collective entrance facility via the transmission line.

  On the other hand, in an apartment house, an intercom system is often built independently from the TV joint reception system from the beginning. In this case, a monitor camera is provided from the beginning in the collective entrance facility, and it is constructed as a TV intercom system equipped with a function (monitor function) that allows a visitor's master unit to view the video of a visitor captured by the monitor camera. However, existing intercom systems, especially existing intercom systems in relatively old apartment buildings, have a monitoring function because it is deemed unnecessary at the time of construction or due to cost reasons. In addition, many have only a voice conversation function (hereinafter also referred to as “voice intercom system”).

  Since such an existing voice intercom system has only a voice conversation function, only the wiring necessary for the voice conversation function is installed in the wiring between the collective entrance facility and each dwelling unit. In most cases, the necessary wiring is not installed. In addition, some existing voice intercom systems are configured so that the monitor facilities can be added as an option for each of the entrance hall equipment and the room base unit. In this way, each device constituting the system has a monitor function. Even if it is compatible, when the apartment house is completed (when the intercom system is constructed), the monitor function is not used because it is determined that only the voice conversation function is sufficient, and the system wiring is also necessary for the voice conversation function. There are many cases that only.

  However, the need to renew the TV intercom system equipped with a monitor function is increasing due to the improvement of security awareness due to the recent changes in social situation and the deterioration of security, and the change in the consciousness of each inhabitant about privacy protection. . However, as mentioned above, most existing voice intercom systems do not have wiring that supports the monitor function. In that case, in order to renew the system with the monitor function, of course, the monitor function It is necessary to newly lay the wiring for the construction, and it is very expensive to construct a new wiring for the entire interior of the already built apartment house. Was not realistic because it would be necessary.

Therefore, as one of the methods for realizing the renewal to the TV intercom system, it is conceivable to construct a new interphone system using the TV joint reception system already built in the building as described above. . In this way, both the audio signal and the video modulation signal can be transmitted using the existing transmission line. Therefore, the renewal can be performed in a relatively short period of time and at a low cost compared to the method of installing a new wiring for the monitor function. Is possible.
JP 59-160296 A

  However, if the existing voice intercom system is simply renewed to a TV intercom system that uses a transmission line for TV joint reception, it will be necessary to newly develop and produce the collective entrance facilities and each parent unit. is there. That is, in order to use a transmission line for joint TV reception, it is necessary to modulate at least the audio signal to a predetermined frequency and transmit it on the transmission line as described above. You must develop and produce new entrance facilities and room masters.

  As a result, the development and production period and cost are relatively large, and there is a risk that it will be difficult (especially in terms of cost) to be easily accepted by the managers and residents of the housing complex. .

  In addition, if the collective entrance facilities and living room base units are made new, the existing collective entrance facilities and living room base units that have been used so far are not used and become unnecessary. In other words, if an existing device that has been used only for the voice conversation function can be used effectively even after renewal, the device is not wasted and it is preferable in terms of cost.

  The present invention has been made in view of the above problems, and makes it possible to easily and inexpensively construct an intercom system capable of transmitting an audio signal and a video modulation signal using a transmission line for a television joint reception system. For the purpose.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a received signal from a receiving antenna for receiving broadcast radio waves is transmitted to a plurality of terminal terminals via a transmission line and signal separation means provided on the transmission line. An intercom system provided in a house where a television joint reception system for transmission is constructed, comprising an entrance facility, a living room base unit, an image display means, an entrance side signal relay device, and a room side signal relay device It is a thing.

  The entrance facility is provided at the entrance of the house, modulates the video signal photographed by the monitor camera and outputs it as a video modulation signal, and outputs the audio input from the entrance side microphone as the entrance side audio signal, and The room-side audio signal output from the room master unit provided in the room of the house is input and the sound is output from the entrance-side speaker.

  The room master unit inputs the entrance side audio signal from the entrance facility, outputs the sound from the room side speaker, and outputs the sound input from the room side microphone as the room side audio signal. The video display means displays a video shot by the monitor camera based on the video modulation signal from the entrance facility.

  The entrance-side signal relay device is provided between the entrance facility and any one of the terminal terminals, and sends the video modulation signal from the entrance facility onto the transmission line via the terminal terminal. A side audio signal is modulated into a front side audio modulation signal that is a signal in a frequency band that can be transmitted through the transmission line, and is sent to the transmission line via the terminal terminal, and is input via the terminal terminal. The room-side audio modulation signal obtained by modulating the room-side audio signal from the room-based master is demodulated into the original room-side audio signal and sent to the entrance facility.

  The room side signal relay device is provided between the room base unit and the video display means, and any one of the terminal terminals excluding the terminal terminal to which the entrance side signal relay device is connected. The room-side audio signal from the room is modulated into the room-side audio modulation signal, which is a signal in a frequency band that can be transmitted through the transmission line, and sent to the transmission line via the terminal terminal, and the entrance Out of the video modulation signal and the entrance side audio modulation signal input from the side signal relay device via the transmission line and the terminal terminal, the video modulation signal is sent to the image display means, and the entrance side audio is transmitted. The modulated signal is demodulated into the original entrance-side audio signal and sent to the room master.

  The signal separation means separates the signal transmitted on the transmission line into one or a plurality of parts, for example, by branching a part of the input signal or equally distributing the input signal. This separation means is not limited to the one that first separates the received signal from the reception antenna, but includes one that further separates the separated signal.

  Further, the frequency band that can be transmitted through the transmission line refers to a vacant band (channel) that excludes frequency bands of various signals other than itself. For example, the video modulation signal is modulated at least in a band excluding the frequencies of the reception signal from the reception antenna, the entrance-side audio modulation signal, and the room-side audio modulation signal.

  In other words, the intercom system of the present invention uses the transmission line of the TV joint reception system between the living room master unit and the entrance equipment to transmit and receive the audio signal and the video modulation signal between the entrance equipment and the transmission line. This is realized by relaying the signal transmission by the entrance side signal relay device and relaying the signal transmission between the room master unit and the video display means and the transmission line by the room side signal relay device.

  Therefore, according to the intercom system of the present invention (Claim 1), the signal relay device and the video display means are newly provided in a house in which an interphone system without wiring for video modulation signal transmission is already installed. Thus, it is possible to use existing equipment (such as a living room parent machine or entrance equipment) as it is. Also, if you cannot use the existing room base unit / entrance equipment, or if you want to renew all of the equipment, you can use the room base unit and entrance equipment with a commercially available monitor function. Only the above signal repeaters need to be purchased and newly developed and designed. Therefore, it is possible to easily and inexpensively construct an intercom system that can transmit an audio signal / video modulation signal using a transmission line for a television joint reception system.

  In addition, the monitor camera is not limited to a camera that can shoot a video, for example, a camera that continuously shoots still images at regular time intervals, as long as the resident can visually recognize at least who the visitor is. Good. The modulation from the video signal to the video modulation signal may be, for example, FM modulation, or may be modulated using other various modulation methods.

  The video display means may be, for example, a small monitor connected to the room master unit, or may be one using a television receiver for viewing TV broadcasts, and further comprising both. It may be. Moreover, you may be comprised as one apparatus with which the living room main | base station and the image | video display means were integrated.

  Invention of Claim 2 is the intercom system of Claim 1, Comprising: The said room side signal relay apparatus outputs the received signal from the said receiving antenna among the signals input via the terminal terminal as it is outside It is configured to According to the intercom system configured as described above, the reception signal from the reception antenna is output as it is from the room-side signal relay device, and can be viewed, for example, by being input to a television receiver or the like. Therefore, one terminal terminal can be used simultaneously for obtaining a received signal from the receiving antenna and intercom system, and even if there is only one terminal terminal in one dwelling unit, Both of the interphone systems can be used.

  Here, for example, the signal output from the entrance-side signal relay device is reliably transmitted to the room-side signal relay device depending on the configuration of the signal separation means provided on the transmission line leading to the room-side signal relay device. There is a risk that it will not be. The same applies to signal transmission from the room side signal relay device to the entrance side signal relay device. That is, for example, when the signal separation means is a distributor that equally distributes the input signal, there is no particular problem. However, for example, when the signal separation means is a branching device that branches a part of the input signal, in general, from the output side of the branching device. Since the input signal is greatly attenuated with respect to the branch output side, it can be considered that the signal is not branched. Therefore, for example, as described in claim 3, the signal separation means may be configured as a bidirectional type.

  That is, the invention according to claim 3 is the interphone system according to claim 1 or 2, wherein at least one of each signal transmitted bidirectionally on the transmission line is provided on the transmission line as the signal separation means. A branching means capable of branching both of the parts to the terminal terminal side is provided. According to the intercom system configured as described above, for example, a signal is input from the input side to the branching unit configured to branch a part of the input signal and output the other part on the same transmission line again. Of course, even when a signal is inputted from the output side, a part of the inputted signal is surely branched. Therefore, when branching means such as a branching device is provided on the transmission line, the bidirectional branching means capable of branching and outputting the signals inputted from both the input side and the output side as in the above configuration is used. The intercom system of the invention (Claim 1 or 2) can be realized.

  On the other hand, in the intercom system according to claim 1 or 2, for example, when a branching unit is provided as a signal separating unit, and the branching unit is a general one having directionality capable of branching only an input signal from one direction. May be configured as described in claim 4, for example.

  That is, the intercom system according to claim 4 branches at least a part of a downlink signal transmitted from the receiving antenna side to the terminal terminal side as the signal separating unit on the transmission line to the terminal terminal side. A branching unit is provided, and at least one of the living room master units is connected to the terminal terminal through which the downlink signal branched by the branching unit is transmitted via the room side signal relay device, The video modulation signal transmitted on the transmission line from the entrance-side signal repeater is within a range on the transmission line before the reception signal from the reception antenna is first separated by the signal separation means. And the entrance-side audio modulation signal is converted into a signal within a predetermined first frequency band within a predetermined downlink signal frequency band including the frequency of the received signal. The room-side audio modulation signal transmitted over the transmission line from the room-side signal relay device is transmitted again on the transmission line, and the predetermined frequency except for the first frequency band in the downlink signal frequency band is transmitted. Frequency conversion means configured to convert the signal into two frequency bands and send it again onto the transmission line is provided.

  The entrance-side signal relay device demodulates the room-side audio modulation signal after frequency conversion by the frequency conversion means into the original room-side audio signal, and the room-side signal relay device uses the frequency conversion means. The video modulation signal after frequency conversion by the above is sent to the video display means, and the entrance side audio modulation signal after frequency conversion is demodulated into the original entrance side audio signal.

  In other words, each modulated signal sent from each signal relay device to the transmission line via the terminal terminal is transmitted as it is to the frequency converting means. The frequency conversion means converts the signals into signals within the first (or second) frequency band and sends them again onto the transmission line (to the terminal terminal side). If it does in this way, each said modulation signal after frequency conversion will be branched to the terminal terminal side in a branching means. That is, although the frequency changes, the signals are surely transmitted to the corresponding signal relay devices.

  Therefore, according to the intercom system of the present invention (Claim 4), even if the branching means has directionality, by providing the frequency converting means as described above, each modulation signal between the signal relays is provided. Is reliably transmitted.

  A fifth aspect of the present invention is the interphone system according to the fourth aspect, wherein the intercom system is bidirectionally transmitted on the transmission line from the frequency converting means to the terminal terminals. Bidirectional amplifiers are provided for amplifying signals at a predetermined amplification rate. According to the intercom system configured as described above, when the TV joint reception system includes a plurality of terminal terminals, in particular, the reception signal from the reception antenna is separated into a plurality of stages by a plurality of signal separation means. Regardless of the configuration, all signals transmitted in both directions are amplified to a predetermined level, so that each signal relay device can receive a signal with a sufficient required level. It becomes possible.

  By the way, as a power source for the room side signal relay device, the room master unit, or the video display means provided in the room, for example, each is provided with a means (outlet or the like) for taking in an external commercial power source individually, and a desired power source is provided therein. Although it may be converted into (for example, DC power supply), there is a possibility that the apparatus will be enlarged. Therefore, for example, as described in claim 6 or claim 7, a desired power source may be directly taken in via a transmission line.

  That is, the invention according to claim 6 is the intercom system according to any one of claims 1 to 5, wherein the signal separation means is a direct current between all signal input / output terminals included in the signal separation means or the The low frequency band current lower than the frequency of each signal is configured to pass through, and the entrance facility is provided with power supply means for supplying DC or the low frequency band power to the outside. The power supply from the supply means is configured to be sent onto the transmission line via the entrance-side signal relay device, and at least the room-side signal relay device, the room master unit, or the video display means in the room One is activated by the power source supplied via the transmission line.

  The invention according to claim 7 is the intercom system according to claim 4 or 5, wherein the signal separation means is configured to connect direct current or each signal between all signal input / output terminals of the signal separation means. A current in a low frequency band lower than the frequency is configured to pass, and the frequency conversion means includes power supply means for supplying DC power or power in the low frequency band to the outside, and the room in the room At least one of the side signal relay device, the living room master, or the video display means is operated by the power supplied from the power supply means via the transmission line.

  That is, a desired power source is received from either the entrance facility or the frequency conversion means via the transmission line. In this way, in the room side signal relay device, the room base unit or the video display means provided in the room, it is only necessary to receive the power supplied via the transmission line. Equipment can be configured easily.

  Invention of Claim 8 is an intercom system in any one of Claims 1-7, Comprising: While the said entrance facility outputs the entrance-side control signal which controls operation | movement of the said room main unit, this room parent When the room-side control signal is received from the machine, the room-side control signal is operated based on the room-side control signal, and the room base unit outputs the room-side control signal for controlling the operation of the entrance facility, and from the entrance facility. When the entrance side control signal is received, it operates based on the entrance side control signal, and the entrance side signal relay device sends the entrance side control signal from the entrance facility onto the transmission line via the terminal terminal. In addition, the room-side control signal input via the terminal terminal is output to the entrance facility, and the room-side signal relay device receives the room-side control signal from the room master unit via the terminal terminal. Sent over transmission line As well as to output the entrance-side control signal input via the said terminal pin to said room master station.

  That is, the entrance facility can be controlled from the living room master unit, and conversely, the living room master unit can be controlled from the entrance facility. And each control signal for controlling each is transmitted mutually via each said signal relay apparatus and a transmission line.

  In this case, the frequency of the control signal transmitted onto the transmission line may be a frequency within the low frequency band as described in claim 9, for example. That is, the frequency band is set such that it can pass between all signal input / output terminals in the signal separation means. Thus, for example, when the entrance-side signal relay device includes the power supply means as in the sixth aspect, the control signal is superimposed on the power and transmitted to each room.

  Invention of Claim 10 is the intercom system of Claim 8 or 9, Comprising: The said house is an apartment house which consists of several dwelling units in which at least one said terminal terminal is arrange | positioned, The said entrance facility is And a dwell unit designating unit for designating any one of the plurality of dwelling units, and outputting an identification signal corresponding to the dwelling unit designated by the dwelling unit designating unit as one of the entrance side control signals. The room master unit is configured to output a sound from the room side speaker only when the identification signal input via the room side signal relay device indicates itself.

  In other words, there are multiple dwelling units in an apartment house, but an identification signal is output as an entrance-side control signal from the entrance facility so that only the dwelling unit corresponding to the identification signal can output sound (that is, can respond by voice). To do. Therefore, even in the present intercom system using the television joint reception system built in the apartment house, only the residents in the desired dwelling unit can be called from the entrance facility to have a conversation.

Further, in this case, for example, as described in claim 11, the room master unit or the room side signal relay device outputs the video by the video display means only when the identification signal indicates itself. You should allow it. In this way, only the residents in the desired dwelling unit can see the video of the monitor camera in addition to the sound.
The invention according to claim 12 is the intercom system according to any one of claims 8 to 11, wherein the living room base unit is an unlocking device for unlocking the locking device of the collective entrance door constituting the entrance facility. The unlocking means for outputting a signal to the transmission line as one of the room-side control signals is provided, and the locking device transmits the unlocking signal transmitted through the transmission line via the entrance-side signal relay device. When it is input to the entrance facility, it is configured to be unlocked based on the input unlock signal.

  That is, a signal for unlocking the locking device of the collective entrance door from each dwelling unit can be transmitted to the collective entrance side via the transmission line. Therefore, it is possible to realize not only a basic function only for calls but also a wider range of functions by using the TV joint reception system.

  Next, the invention according to claim 13 is the signal relay device used as the entrance-side signal relay device in the intercom system according to claim 1, wherein the video modulation signal from the entrance facility is transmitted to the terminal terminal side. A first video modulation signal sending means for sending to the entrance side, an entrance audio modulation means for modulating the entrance side audio signal from the entrance facility into the entrance side audio modulation signal, and the room input via the terminal terminal Room audio demodulation means for demodulating the side audio modulation signal into the room audio signal. Therefore, according to the signal relay device having the above configuration, the intercom system according to claim 1 can be constructed, and in this case, the same operation and effect as those of claim 1 can be obtained.

  Furthermore, in order to use this signal relay device as an entrance-side signal relay device in the intercom system according to claim 4, for example, as in claim 14, the room audio demodulating means is converted into a frequency after frequency conversion by the frequency conversion means. The room-side audio modulation signal may be demodulated into the original room-side audio signal. According to the signal relay device configured as described above, the intercom system according to claim 4 can be constructed. In this case, the same operation and effect as in claim 4 can be obtained.

  Next, the invention according to claim 15 is the signal relay device used as the room side signal relay device in the intercom system according to claim 1, wherein the room side audio signal from the room master is sent to the room side The room audio modulation means for modulating the audio modulation signal, the second video modulation signal sending means for sending the video modulation signal inputted via the terminal terminal to the room master side, and the terminal terminal And an entrance audio demodulating means for demodulating the entrance side audio modulation signal input to the entrance side audio signal. Therefore, according to the signal relay device having the above configuration, the intercom system according to claim 1 can be constructed, and in this case, the same operation and effect as those of claim 1 can be obtained.

  In this case, for example, a reception signal passing means for outputting a reception signal from the reception antenna out of the signals input via the terminal terminal as it is may be provided. According to the signal relay device configured as described above, the intercom system according to claim 2 can be constructed, and in this case, the same operation and effect as in claim 2 can be obtained.

  Furthermore, in order to use this signal relay device as a room-side signal relay device in the intercom system according to claim 4, for example, as in claim 17, the entrance audio demodulating means is provided after frequency conversion by the frequency conversion means. The entrance side audio modulation signal is demodulated into the original entrance side audio signal, and the second video modulation signal sending means sends the video modulation signal after frequency conversion by the frequency conversion means to the video display means. You may comprise as. According to the signal relay device configured as described above, the intercom system according to claim 4 can be constructed. In this case, the same operation and effect as in claim 4 can be obtained.

  Furthermore, this signal relay device may be configured to be operated by a power source supplied from a transmission line via the terminal terminal, for example, as in claim 18. According to the signal relay device configured as described above, the intercom system according to claim 6 or 7 can be constructed, and in this case, the same operation and effect as in claim 6 or 7 can be obtained.

Preferred embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a configuration diagram showing a schematic configuration of the collective intercom system of the present embodiment. This collective intercom system is a collective housing with a plurality of individual dwelling units, in which a television joint reception system (in-building CATV system) is built, a transmission line for the television joint reception system, The configuration uses transmission equipment and the like. Therefore, prior to the description of the collective intercom system, the television joint reception system will first be outlined.

  As shown in FIG. 1, the television joint reception system in this embodiment includes a VHF antenna 1 that receives broadcast waves of FM radio broadcast and VHF television broadcast, a UHF antenna 2 that receives broadcast waves of UHF television broadcast, and a broadcast. Broadcast radio waves from satellites and communication satellites (BS and 110 ° CS in this embodiment) are received, and the received signals are converted into satellite received signals (BS-IF signals) in the intermediate frequency band for cable transmission by a converter. And a satellite receiving antenna 3 for outputting.

  The received signals (television signals) from these antennas 1, 2, 3 are each amplified to a predetermined level by an amplifier (booster) 4, and are transmitted on a transmission line L made of a coaxial cable wired in the building. Is sent out.

  Instead of the antennas 1, 2, and 3, for example, a CATV signal may be captured from an external CATV system, and the CATV signal may be transmitted onto the transmission line L. Both the TV signal from 2 and 3 and the CATV signal may be sent on the transmission line L.

  The transmission line L transmits the TV signal output from the booster 4 to the terminal terminals 8a, 9a, 10a,... Installed in the individual dwelling units (rooms) in the building. On L, various transmission devices such as a branching device (four branching device) 6, a distributor (6 distributor) 7, a distributor (4 distributor) 8, 9, 10 are installed as necessary. .

  As an example, the apartment house of this embodiment shows a five-story house. In FIG. 1, the individual dwelling units 20 and 30 located on the fifth floor and the fourth floor, and the collective entrance located on the first floor. The equipment 11 is illustrated.

  Of the four branch outputs from the branching device 6 provided on the transmission line L, two are output to the fifth floor and the remaining two are output to the fourth floor. Of these, the branch outputs to the fifth floor (two systems) are each divided into four by a distributor 8 and a distributor (not shown) (the same configuration as the distributor 8). That is, as a result, a total of eight distributions are made on the fifth floor, and one of the distribution outputs is transmitted to the terminal terminal 8a in the individual dwelling unit 20. Further, branch outputs (two systems) to the fourth floor are also divided into four by a distributor 9 and a distributor (not shown) (same configuration as the distributor 9). That is, as a result, a total of 8 distributions are made on the 4th floor, and one of the distribution outputs is transmitted to the terminal terminal 9a in the individual dwelling unit 30.

  The distributor 7 distributes the signal on the transmission line L into six. Of these six distribution outputs, two systems go to the first floor, the other two systems go to the second floor, and the remaining two systems go to the third floor. Respectively. Among these, the distribution output (two systems) to the first floor is divided into four by a distributor 10 and a distributor (not shown) (the same configuration as the distributor 10). That is, as a result, a total of 8 distributions are made on the first floor, and one of the distribution outputs is transmitted to the collective entrance facility 11 side.

  The distribution output to the second floor (two systems) is divided into four by a distributor (not shown) (the same configuration as the distributors 8, 9, and 10) (total of eight distributions), and each distribution output is on the second floor. It is transmitted to each individual dwelling unit (not shown). In other words, the configuration for transmitting the distribution output from the distributor 7 (two systems for the second floor) to each part of the second floor is the branch output from the branching device 6 (two systems for each floor) on the fourth or fifth floor. It is the same as the structure for transmitting to each part. The same applies to the third floor.

  Note that the branching device 6 of this embodiment is a well-known branching device having directivity configured to branch only the downlink signal from the receiving antenna 1, 2, 3 side to each terminal. This corresponds to the branching means of the invention (claim 4). However, it is configured as an all-terminal current passing type branching device that can pass signals of DC and low frequency band (in this embodiment, for example, 100 kHz or less) between the input / output terminals and all the terminals of each branch terminal. Has been. Further, other branching devices (not shown) other than the branching device 6, the distributors 7 to 10 and other distributors (not shown) are also configured as an all-terminal current passing type like the branching device 6. That is, a low frequency band signal (including direct current) is transmitted to the entire transmission line L.

  Next, a schematic configuration of the collective intercom system constructed together with the TV joint reception system described above in the collective housing of the present embodiment will be described. The collective intercom system of the present embodiment connects a living room intercom device provided in each individual dwelling unit and a transmission line L via a dwelling unit adapter, and also provides collective entrance equipment and transmission line L provided at the entrance of a collective residence (not shown). Are connected to each other through an adapter for a group, so that a call between each individual unit and the group entrance can be viewed on the individual unit side.

  Specifically, in the individual dwelling unit 20 located on the 5th floor, a dwelling unit adapter 21 is connected to the terminal terminal 8a, and the dwelling unit adapter 21 is connected to a room intercom device 22 and a television receiver (hereinafter simply referred to as “TV”). 23 is connected. Similarly, in the individual dwelling unit 30 located on the fourth floor, the dwelling unit adapter 31 is connected to the terminal terminal 9a, and the living room intercom device 32 and the TV 33 are connected to the dwelling unit adapter 31. On the first floor, a collecting adapter 12 is connected to the terminal terminal 10 a, and a collecting intercom control device 13 constituting the collecting entrance facility 11 is connected to the collecting adapter 12. Further, a management room master unit 14 and a collective entrance unit 15 are connected to the collective intercom control device 13, and a door lock device 19 is connected to the collective entrance unit 15. In addition, about the individual dwelling unit, since the individual dwelling units 20 and 30 are the same structures, the following description demonstrates based on the individual dwelling unit 20 of the 5th floor.

  In addition, the frequency converter 5 is placed on the transmission line L directly below the receiving antennas 1, 2, and 3, that is, in a range before the television signal is branched by the branching device 6 as the first signal separation means. Is provided. This frequency converter 5 is for frequency-converting the upstream signal transmitted from each terminal and sending it again onto the transmission line L as a downstream signal.

  In this collective intercom system, a visitor first calls a dwelling unit to be visited by a collective entrance machine 15 (see FIG. 5 described later) provided as a collective entrance facility 11. Specifically, it is performed by inputting the room number of the visited place with the numeric keypad 15a shown in FIG. 5, and when the room number is input, an identification signal corresponding to the input room number is sent from the collective intercom control device 13. The data is sent onto the transmission line L via the collecting adapter 12 and the distributor 10.

  Since this identification signal is a signal in the low frequency band (52 kHz and 68 kHz in the present embodiment), it passes through each branch / distributor on the transmission line L as it is and is transmitted to all individual dwellings. Therefore, it is also transmitted to the individual dwelling unit 20 on the fifth floor, and is input to the living room intercom device 22 via the dwelling unit adapter 21. As shown in FIG. 3, the room intercom device 22 is specifically composed of a room base unit 26 and a monitor device 27, and the identification signal input to the room base unit 26 corresponds to itself (the individual dwelling unit 20). If it is a corresponding one, the resident is informed by a voice or the like from the speaker 26b (see FIG. 6 described later) that there was a visitor.

  Here, specific configurations of the collective entrance machine 15 and the living room master machine 26 will be described. First, as shown in FIG. 5, the collective entrance machine 15 includes a numeric keypad 15 a for inputting a room number and the like, a speaker 15 b for outputting sound from a resident in the individual dwelling unit (entrance side speaker of the present invention), a visitor A monitor camera 15c that captures the image and outputs the video modulation signal, a display unit 15d that displays the input content of the numeric keypad 15a, and the like. And a microphone 15e (an entrance side microphone of the present invention) for generating an entrance side audio signal of the invention.

  On the other hand, as shown in FIG. 6, the living room base unit 26 inputs a voice for a resident to talk with a visitor and generates a voice signal (room-side voice signal of the present invention). A handset 26a (corresponding to the room-side microphone and the room-side speaker of the present invention) for outputting the voice of the input visitor by voice, and a speaker 26b for notifying the resident of the fact that there was a visitor, etc. And various states such as turning on when there is a visitor, etc., a collective entrance door lock unlocking button 26c for instructing unlocking of the door lock device 19 of the collective entrance door (not shown) constituting the collective entrance facility 11 And a call indicator lamp 26d for informing the resident.

  Therefore, when the identification signal input to the living room base unit 26 corresponds to itself, the speaker 26b is informed as described above, the call indicator lamp 26d is turned on, and a conversation with the visitor is performed on the handset 26a. It becomes possible. At the same time, by outputting the monitor activation signal to the monitor device 27, the monitor device 27 is activated to display the video imaged by the monitor camera 15c, and the monitor activation signal is also input to the dwelling unit adapter 21. The video is also input to the TV 23, and the video can be viewed on a predetermined channel on the TV 23. The state in which the monitor activation signal is output from the room master unit 26 corresponds to the “permitted video output” state in the present invention (claim 11).

  The management room master unit 14 is for a person who manages the collective intercom system as a whole. For example, the control room master unit 14 controls the devices in each individual dwelling unit, and, for example, controls all residents in all individual dwelling units simultaneously. Broadcasting, broadcasting to some (a plurality of) residents (block broadcasting), or broadcasting to specific residents (individual broadcasting) can be performed.

  The audio signal and the FM video modulation signal from the collective entrance machine 15 are input to the collective adapter 12 via the collective intercom control device 13. Then, the collective adapter 12 FM-modulates the input audio signal (baseband), and together with the FM video modulation signal, a predetermined signal in the upstream signal frequency band (10 to 55 MHz in the present embodiment) in the television joint reception system. Frequency (in this embodiment, the center frequency is 26 MHz and the bandwidth is about 6 MHz), and the frequency is converted (up-converted) to be transmitted onto the transmission line L as a collective transmission signal (uplink). FIG. 7 shows an example of frequency arrangement of various signals transmitted on the transmission line L in the present embodiment.

  This aggregate side transmission signal (upstream) is transmitted in the upstream direction on the transmission line L, passes through the branching device 6 and is input to the frequency converter 5. Then, the frequency converter 5 has a predetermined frequency (in this embodiment, the center frequency is 509 MHz and the bandwidth is about 6 MHz) in the downlink signal frequency band (70 to 770 MHz in the present embodiment) in the television joint reception system. The frequency is converted into the aggregate side transmission signal (downlink) and transmitted again onto the transmission line L. This aggregate-side transmission signal (downlink) is branched by the branching device 6, further distributed by the distributor 8, and then input to the dwelling unit adapter 21 via the terminal terminal 8a. The dwelling unit adapter 21 converts the frequency into an original FM video modulation signal (down-converted) and demodulates the original audio signal (baseband), and outputs it to the room intercom device 22 and the TV 23.

  On the other hand, the audio signal from the living room base unit 26 is FM-modulated by the dwelling adapter 21, and further, a room having a predetermined frequency within the upstream signal frequency band (in this embodiment, the center frequency is 20 MHz and the bandwidth is about 6 MHz). The signal is converted into a side transmission signal (upstream) and transmitted onto the transmission line L.

  This room-side transmission signal (upstream) is transmitted to the frequency converter 5 via the distributor 8 and the branching unit 6, and the frequency converter 5 uses a predetermined frequency (in this embodiment, in the downstream signal frequency band). The frequency is converted into a room-side transmission signal (downward) with a center frequency of 503 MHz and a bandwidth of about 6 MHz, and the signal is transmitted again onto the transmission line L. This room-side transmission signal (downlink) is input to the collecting adapter 12 via the branching device 6, the distributor 7, the distributor 8, and the terminal terminal 10a. Then, the collective adapter 12 demodulates the original audio signal and inputs it to the collective entrance 15 via the collective intercom control device 13.

  The collective intercom control device 13 also outputs various control signals including the above identification signal (the entrance-side control signal of the present invention) to the collective adapter 12. This control signal is a low frequency signal in this embodiment. Since it is a 52 kHz and 68 kHz FSK (Frequency Shift Keying) signal within the band, it is transmitted to each individual dwelling unit at the same frequency. This control signal is mainly for controlling the operation of the room intercom device 22.

  In addition, the control signal (room side control signal of the present invention) for controlling the collective entrance machine 15, the collective intercom control device 13, etc. is also sent from the living room intercom device 22 (specifically, from the living room master unit 26) to the dwelling unit adapter. The control signal (the FSK signal) from the collective intercom control device 13 is also transmitted to the collective entrance facility 11 as it is. And each part in the collective entrance equipment 11 will operate | move based on it, if a control signal is input.

  Control signals from the collective intercom control device 13 include, for example, an end call / call / call / setting display / initialization. On the contrary, the control signal from the living room base unit 26 includes, for example, rejection / acceptance / alarm / status notification / initialization.

  The aggregate side transmission signal (upstream) constitutes the video modulation signal and the entrance side audio modulation signal of the present invention, and the room side transmission signal (upstream) corresponds to the room side audio modulation signal of the present invention. The transmission signal (downlink) corresponds to a signal in the first frequency band of the present invention, and the room-side transmission signal (downlink) corresponds to a signal in the second frequency band of the present invention. Both the monitor device 27 and the TV 23 correspond to the video display means of the present invention. The door lock device 19 corresponds to the locking device of the present invention, and the collective entrance door lock unlocking button 26c corresponds to the unlocking means of the present invention.

  Next, the internal configuration of the collecting adapter 12 as the entrance-side signal relay device will be described with reference to FIG. FIG. 2 is a block diagram showing a schematic configuration of the collecting adapter 12. As shown in FIG. 2, in the collective adapter 12 of this embodiment, an audio signal (baseband) input from the collective entrance machine 15 via the controller 18 is input to the FM audio modulation unit 41, and an FM having a predetermined frequency. Modulated into an audio signal.

  This FM audio signal is input to the up-converter 42 together with the FM video modulation signal that is input in a state where the video modulation signal (baseband) from the collective entrance machine 15 is FM-modulated by the video controller 17 and transmitted to the collective side. It is converted into a signal (upstream) (center frequency 26 MHz). Then, this aggregate side transmission signal (upstream) is called a duplex filter, a high-pass filter (hereinafter referred to as “HPF”) 43 having a cutoff frequency of, for example, 10 MHz, and a low-pass filter having a cutoff frequency of, for example, 55 MHz. (Hereinafter referred to as “LPF”) 44 to the terminal terminal 10a.

  On the other hand, the room-side transmission signal (downlink) (center frequency 503 MHz) transmitted via the transmission line L is input to the tuner 46 via the HPF 45 (cutoff frequency is 70 MHz, for example). A modulated signal is selected. Then, after being filtered by a SAW filter (pass band is, for example, 500 to 506 MHz) 47, it is demodulated into an original audio signal (baseband) by the FM audio demodulator 48 and input to the controller 18. The controller 18 outputs the audio signal to the collective entrance machine 15, and as a result, the audio is output from the speaker 15 b of the collective entrance machine 15. Note that an audio signal can also be output to the management room base unit and output from an unillustrated speaker or the like.

  Further, the controller 18 outputs various control signals based on the state of each part of the collective entrance 15 to the collect adapter 12, and is transmitted from the individual dwelling unit side, and LPF44, LPF49 (cutoff frequency is, for example, 10 MHz) and Various control operations based on a control signal input via the HPF 50 (cutoff frequency is, for example, 10 kHz) are performed. Therefore, for example, when the collective entrance door lock unlock button 26 is turned on in the individual dwelling unit 20, that effect is transmitted to the controller 18 in the collective entrance facility 11 as a control signal (unlock signal). The collective entrance machine 15 is controlled to unlock the door lock device 19.

  In addition to controlling the video modulation signal, the video controller 17 supplies power for generating operation power (for example, DC power) for each device on the individual dwelling unit side (for example, the dwelling unit adapter 21 and the monitor device 27 in the individual dwelling unit 20). The DC power generated here is sent to the terminal terminal 10a via the LPF 51, LPF 49, and LPF 44 that pass only the direct current component, and is supplied to each individual dwelling unit via the transmission line L. . That is, the video controller 17 also functions as power supply means of the present invention. Note that the collecting adapter 12 may have a power supply function instead of the video controller 17.

  Here, if the FM video modulation signal and the FM audio signal are fixed to one channel, the frequency conversion operation in the up-converter 42 is also fixed. That is, the frequency of the local signal can be fixed. However, for example, when a plurality of collective entrance machines 15 are provided and transmitted by FM video modulation signals and FM audio signals of a plurality of channels, it is necessary to perform frequency conversion according to the channel. In such a case, a channel selection signal is transmitted from the video controller 17 to the CPU 52, and the CPU 52 controls the upconverter 42 so that the upconverter 42 performs frequency conversion according to the channel selection signal.

  In the aggregation adapter 12, the path through which the FM video signal is transmitted to the transmission line L side through the upconverter 42, the HPF 43, and the LPF 44 corresponds to the first video modulation signal sending means of the present invention. 48 corresponds to the room audio demodulation means of the present invention, and the FM audio modulation unit 41 corresponds to the entrance audio modulation means of the present invention.

  Next, the internal structure of the adapter 21 for dwelling units as a room side signal relay apparatus is demonstrated based on FIG. FIG. 3 is a block diagram showing a schematic configuration of the dwelling unit adapter 21. As shown in FIG. 3, in the adapter for dwelling unit 21 of the present embodiment, the audio signal (baseband) from the living room base unit 26 is modulated into an FM audio signal by the FM audio modulation unit 61, and this is transmitted to the room side transmission signal (upstream). ) And the HPF 62 (cut-off frequency is, for example, 10 MHz) and LPF 63 (cut-off frequency is, for example, 55 MHz).

  In addition, the control signal from the living room base unit 26 to the gathering adapter 12 side and the control signal from the gathering adapter 12 to the living room base unit 26 are both LPF 63, LPF 64 (cutoff frequency is 10 MHz, for example) and HPF 65 ( The cut-off frequency is transmitted via, for example, 10 kHz.

  On the other hand, the collective side transmission signal (downstream) (center frequency 509 MHz) output from the collective entrance facility 11 and frequency-converted by the frequency converter 5 is input to the tuner 67 via the HPF 66 (cutoff frequency is, for example, 70 MHz). Is done. The TV signals from the receiving antennas 1, 2, and 3 are also input via the HPF 66, and directly input to the TV 23 through the dwelling unit adapter 21. Thereby, various TV broadcasts can be viewed on the TV 23. The transmission path of the television signal from the terminal terminal 8a side until it is output to the TV 23 via the HPF 66 corresponds to the reception signal passing means of the present invention.

  In the tuner 67, the input aggregate side transmission signal (downlink) is output at an intermediate frequency (IF) of 54 to 60 MHz, and this intermediate frequency signal is input to the SAW filter 68 (pass band is 54 to 61 MHz, for example). The Specifically, as shown in FIG. 8, the intermediate frequency signal includes an FM audio signal having a center frequency of 54.25 MHz and an FM frequency deviation of ± 5 kHz, and a center frequency of 58.75 MHz and an FM frequency deviation. Is composed of an FM video modulation signal of −1.8 to +0.2 MHz.

  Among these, the FM audio signal is input to the FM audio demodulator 70 via the LPF 69 (cutoff frequency is 55 MHz, for example), where it is demodulated into an audio signal (baseband) and sent to the room master unit 26 and the RF modulator 71. Entered.

  The FM video modulation signal is input to the down converter 73 via the HPF 72 (cutoff frequency is 57 MHz, for example). The down converter 73 performs frequency conversion (down conversion) of the input FM video modulation signal to a frequency before being up-converted by the up-converter 42 in the aggregation adapter 12, and the monitor device 27 and the FM video demodulation unit 74. Output to. As a result, the video can be viewed on the monitor device 27.

  On the other hand, the FM video modulation signal input to the FM video demodulation unit 74 is FM demodulated into a video modulation signal (baseband) and input to the RF switch 75. The RF switch 75 is for turning on / off the output of the video modulation signal from the FM video demodulator 74 to the RF modulator 71, and when the monitor activation signal is output, that is, the individual dwelling unit 20 generates an identification signal. Is turned on, and the video modulation signal is input to the RF modulator 71. The RF modulator 71 modulates the video modulation signal and the audio signal from the FM audio demodulation unit 70 into a signal having a frequency (channel) that can be viewed on the TV 23, and outputs the signal to the TV 23. As a result, it is possible to view the image captured by the monitor camera 15 c of the collective entrance machine 15 and the sound input to the speaker 15 b on the TV 23 in the individual dwelling unit 20.

  In the present embodiment, the video modulation signal is configured to be turned on / off by the RF switch 75, but instead, for example, the power of the RF modulator 71 may be turned on / off by a monitor activation signal. . That is, when the identification signal designates itself, the power source of the RF modulator 71 is turned on to modulate the video modulation signal.

  The DC power generated by the video controller 17 in the collective intercom control device 13 and supplied via the transmission line L is input to the monitor device 27 via the LPF 63, LPF 64, and LPF 76 (only the DC component passes). The As a result, the monitor device 27 can be operated by this DC power source. This DC power supply also serves as an operating power supply for the dwelling adapter 21 itself.

  It is also possible to configure the dwelling unit adapter 21 and the monitor device 27 so as to be operated by a DC power source generated by taking an external commercial power source (AC 100 V or the like) independently and converting it into DC. Further, in the adapter for dwelling unit 21, the path through which the FM video signal input from the transmission line L is transmitted to the monitor device 27 side through the tuner 67, the SAW filter 68, the HPF 72, and the down converter 73 is the second video of the present invention. The FM sound modulation unit 61 corresponds to the modulation signal transmission unit, the room sound modulation unit of the present invention, and the FM sound demodulation unit 70 corresponds to the entrance sound demodulation unit of the present invention.

  Next, the frequency converter 5 will be described with reference to FIG. FIG. 4 is a block diagram showing a schematic configuration of the frequency converter of the present embodiment. As shown in FIG. 4, in the frequency converter 5, the aggregate side transmission signal (upstream) and the room side transmission signal (upstream) are LPF89 (cutoff frequency is 55 MHz, for example), LPF88 (cutoff frequency is 30 MHz, for example), and HPF85. (The cut-off frequency is, for example, 15 MHz) is input to the mixer 83, where it is frequency-converted into a downlink signal by a local oscillation signal of a predetermined frequency from the local oscillator 84. Then, the aggregate-side transmission signal (downlink) and the room-side transmission signal (downlink), which are signals after frequency conversion, are transmitted again through the distributor (three distributors) 82 and the HPF 90 (cutoff frequency is, for example, 70 MHz). L is sent in the down direction on L. Note that television signals from the receiving antennas 1, 2, and 3 are transmitted onto the transmission line L via the distributors 81 and 82 and the HPF 90.

  Although not shown in the figure, the TV joint reception system can be connected to an external CATV system and the CATV Internet can be performed via the CATV system. In that case, the CATV Internet upstream signal from each terminal is transmitted to the booster 4 side (upstream direction) via the LPF 89, HPF 87 (cutoff frequency is 30 MHz, for example) and distributor 81 in the frequency converter 5. .

  According to the collective intercom system of the present embodiment described above, on the collective entrance facility 11 side on the first floor, the collective entrance control device 13 and the terminal terminal 10a are connected via the collective adapter 12 to collect the collective entrance. Various signals from the facility 11 are transmitted to each individual dwelling unit via the transmission line L. Further, in the individual dwelling unit 20, various signals from the room intercom device 22 are transmitted to the collective entrance equipment 11 side via the transmission line L by connecting the room intercom device 22 and the terminal terminal 8 a with the dwelling unit adapter 21. Will come to be.

  That is, in a house where an interphone system without wiring for video modulation signal transmission is already installed, at least each of the adapters and the monitor device 27 are newly provided, so that existing equipment (such as the room master unit 26 and the collective entrance unit) can be provided. 15, controller 18, door lock device 19, etc.) can be used as they are, and a TV intercom system with a monitor function can be constructed.

  In addition, even if existing equipment cannot be used or if it is possible to renew all of the equipment, it is possible to use (purchase) a commercially available monitor with a monitor function as a base unit or collective entrance equipment. Only the adapters mentioned above need to be newly developed and designed. Therefore, it is possible to easily and inexpensively construct a collective intercom system that can transmit an audio signal / video modulation signal using the transmission line L for the television joint reception system.

  Moreover, since the adapter 21 for dwelling units is comprised so that the television signal from receiving antenna 1,2,3 can be output to the exterior as it is, one terminal terminal is used simultaneously for acquisition of a television signal, and for collective intercom systems. Even if there is only one terminal terminal in one dwelling unit, both TV broadcast viewing and use of the collective intercom system are possible.

  Furthermore, since the frequency converter 5 is provided, the upstream signal from the terminal terminal side is converted into the downstream signal and transmitted again to the terminal terminal side. Therefore, between the collective entrance facility 11 and each individual dwelling unit Signal exchange is performed reliably.

  Furthermore, the dwelling unit adapter 21 and the monitor device 27 are configured to be operated by a DC power source supplied from the collective entrance facility 11 side. There is no need to provide a general power supply circuit or the like for conversion to a power supply, and the configuration of the devices 21 and 27 can be further simplified.

[Second Embodiment]
In the first embodiment, for example, when there are a plurality of collective entrance units 15 and transmitted by FM video modulation signals and FM audio signals of a plurality of channels, the video control unit can perform frequency conversion according to the channels. A channel selection signal is transmitted from 17 to the CPU 52. The CPU 52 controls the upconverter 42 based on the channel selection signal, so that the upconverter 42 performs frequency conversion according to the channel selection signal. Further, by transmitting this channel selection signal as one of the control signals also to the individual dwelling unit (living room main unit), for example, in the individual dwelling unit 20 on the fifth floor, from the living room main unit 26 to the CPU 77 in the dwelling unit adapter 21. The channel selection signal was transmitted. Thereby, the CPU 77 can acquire the audio signal / video modulation signal of a desired channel by controlling the tuner 67 and the down converter 73.

  On the other hand, in this embodiment, the frequency of the FM audio signal and FM video modulation signal transmitted between the collective entrance facility 11 and each individual dwelling unit 20, 30,... Is fixed (only one channel). Therefore, the configuration of each adapter 12, 21 and the like is simplified, and the configuration of the entire collective intercom system is simplified.

  First, the assembly adapter of this embodiment will be described with reference to FIG. As shown in FIG. 9, the collective adapter 135 of this embodiment is mainly a duplex filter composed of an LPF 51 and an HPF 50, an upconverter 42, and a tuner 46, as compared with the collective adapter 12 of the first embodiment (see FIG. 2). The difference is that a capacitor 137 for cutting the DC power source is provided on the control signal transmission line. Therefore, the same components as those of the collecting adapter 12 in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted. In the first embodiment, an example has been shown in which the upper limit of the downlink signal frequency band is 770 MHz (see FIG. 7). However, in this embodiment, even on a frequency of 770 MHz or higher, the downlink signal is transmitted on the transmission line L. It is configured to transmit.

  The center frequency of the FM video modulation signal output from the video controller 17 is, for example, 12 MHz when the monitor camera 15c (see FIG. 5) of the collective entrance machine 15 is for color imaging, and is 6 MHz, for example, for monochrome imaging. Or 18 MHz. Specifically, as shown in FIG. 12A, it has a predetermined bandwidth.

  When the FM video modulation signal is a black and white video (6 MHz or 18 MHz) and the monitor device 27 provided in each individual dwelling unit 20, 30,... Is also a black and white monitor device, the monitor device 27 receives the FM video modulation signal of 6 MHz. If it is input, the signal is processed as it is, and if an 18 MHz FM video modulation signal is input, the signal is processed after being internally reduced to 1/3 of 6 MHz. That is, when the monitor device 27 is for black and white, all internal signal processing is performed at 6 MHz. It goes without saying that the FM video modulation signal for black and white may be only one type instead of two types as described above.

  On the other hand, when the FM video modulation signal is a color video (12 MHz) and the monitor device 27 provided in each individual dwelling unit 20, 30,... Is also a color monitor device, the monitor device 27 inputs the 12 MHz FM video. The modulated signal is processed to display a color image. As described above, the type (color or monochrome) and frequency of the FM video modulation signal output from the video controller 17 are different depending on the configuration of the monitor camera 15c and the video controller 17, but in any case, the FM audio signal ( In this embodiment, 10.64 MHz (see FIG. 12A)) and HPF 143 (cut-off frequency is, for example, 5 MHz) and the LPF 44 are transmitted to the transmission line L. The FM audio signal (10.64 MHz) is obtained by FM-modulating the audio signal (baseband) from the controller 18 by the FM audio modulation unit 138.

  Further, for example, an FM audio signal transmitted from the individual dwelling unit 20 side (in this embodiment, a downlink signal of 769.24 MHz, see FIG. 12B) is input to the down converter 139 via the HPF 45. In this down converter, the signal input via the HPF 45 is frequency-converted by a local oscillation signal (780 MHz in this embodiment) from the local oscillator 140. The 10.76 MHz band FM audio signal is extracted by the BPF 141 from the frequency-converted signal, and demodulated to the baseband by the FM audio demodulation unit 142. The 10.76 MHz FM audio signal extracted by the BPF 141 is output from the dwelling unit adapter 123 described later (see FIG. 12A).

  The control signal is transmitted bidirectionally via LPF 44 and LPF 136 (cutoff frequency is 1 MHz, for example) and a capacitor 137, and the DC power from the video controller 17 is transmitted on the transmission line L via LPF 136 and LPF 44. To (supplied).

  Next, the adapter for dwelling units of this embodiment is demonstrated based on FIG. As shown in FIG. 10, the dwelling unit adapter 123 of this embodiment is mainly a duplex filter composed of LPF 76 and HPF 65, a down converter 73 and a tuner 67, compared with the dwelling unit adapter 21 (see FIG. 3) of the first embodiment. Points, and the FM video modulation signal is output only to the monitor device 27 in the room intercom device 22, and the components for viewing the video on the TV 23 (such as the RF switch 75 and the RF modulator 71) are omitted. The filter configuration for extracting the FM audio signal and the FM video modulation signal from the signal input from L is changed, and the DC power cut capacitor 125 is provided on the control signal transmission line. Different. Therefore, the same code | symbol is attached | subjected to the same component as the adapter 21 for dwelling units of FIG. 3, and the detailed description is abbreviate | omitted.

  The audio signal (baseband) output from the room master unit 26 is modulated into, for example, an FM audio signal of 10.76 MHz (see FIG. 12A) by the FM audio modulation unit 126 and transmitted via the HPF 62 and the LPF 63. Sent out on line L.

  On the other hand, various downstream signals input from the transmission line L are distributed to the down converter 128 and the TV 23 via the distributor 127. As a result, the TV 23 can input a television signal from each of the receiving antennas 1, 2, and 3 to view a television program. In the down converter 128, the input signal distributed by the distributor 127 is frequency-converted by a local oscillation signal (780 MHz in this embodiment) from the local oscillator 129.

  Of the frequency-converted signals, the 10.64 MHz FM audio signal output from the aggregation adapter 135 is extracted by the BPF 130 and demodulated to baseband by the FM audio demodulation unit 131. The signal after frequency conversion by the down converter 128 is also input to a band eliminate filter (hereinafter referred to as “BEF”) 132 that removes only the 10.64 MHz band signal, and after the FM audio signal is cut, By passing through the BPF 133 (pass band is 5 to 21 MHz, for example), an FM video modulation signal is extracted. This FM video modulation signal is also output from the collecting adapter 135, and as described above, it is 12 MHz for color and 6 MHz or 18 MHz for black and white.

  The control signal is bidirectionally transmitted through the LPF 63, LPF 124 (cutoff frequency is 5 MHz, for example), and the capacitor 125, and the DC power supplied from the video controller 17 through the transmission line L is LPF 63. And supplied to the monitor device 27 via the LPF 124.

  Next, the frequency converter of this embodiment is demonstrated based on FIG. As shown in FIG. 11, the frequency converter 160 of the present embodiment is mainly composed of a distributor 82 (three distributors) with two distributors compared to the frequency converter 5 of the first embodiment described in FIG. 4. The difference is that a distributor 165 is used, and that the LPF 163 (corresponding to the LPF 86 in FIG. 4) is connected to the 75Ω termination resistor on the output side. Therefore, the same components as those of the frequency converter 5 in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the frequency converter 160, the collecting side transmission signal (upstream) and the room side transmission signal (upstream) are mixed into the mixer 83 via the LPF 89, the LPF 161 (cutoff frequency is, for example, 21 MHz), and HPF 162 (cutoff frequency is, for example, 15 MHz). Here, the frequency is converted into a downstream signal by a local oscillation signal of a predetermined frequency (780 MHz in this embodiment) from the local oscillator 164. Then, the aggregate-side transmission signal (downlink) and the room-side transmission signal (downlink), which are signals after frequency conversion, are again transmitted on the transmission line L through the distributor 165 and the HPF 90 in the downlink direction. Note that television signals from the receiving antennas 1, 2, and 3 are transmitted onto the transmission line L via the distributors 81 and 165 and the HPF 90.

  A specific example of the frequency arrangement of each signal before and after frequency conversion by the frequency converter 160 is as shown in FIG. That is, the FM audio signal (10.64 MHz) output as an upstream signal from the aggregation adapter 135 shown in FIG. 12A is converted into a 769.36 MHz FM audio signal as shown in FIG. Then, it is sent onto the transmission line L as a downstream signal.

  Similarly, an FM video modulation signal (12 MHz for color, 6 MHz or 18 MHz for black and white) output as an upstream signal from the collecting adapter 135 is 768 MHz for color, as shown in FIG. In the case of black and white, the frequency is converted into an FM video modulation signal of 762 MHz or 774 MHz, and is transmitted onto the transmission line L as a downstream signal.

  Further, the FM audio signal (10.76 MHz) output from the dwelling unit adapter 123 shown in FIG. 12A as an upstream signal is also converted into a 769.24 MHz FM audio signal as shown in FIG. Then, it is sent onto the transmission line L as a downstream signal.

  According to the collective intercom system of the present embodiment described above, the collective adapter 135 mixes the FM video modulation signal from the video controller 17 with the FM audio signal at the same frequency and outputs it on the transmission line L. In addition, by fixing the transmission frequency, tuning by the tuner 46 (see FIG. 2) as in the first embodiment is unnecessary, and in the first embodiment, a duplex filter (HPF50, LPF51) is used. Since the separation of the DC power supply and the control signal that has been performed is simply realized by the capacitor 137, the circuit configuration of the collecting adapter 135 can be simplified.

  Further, in the adapter for dwelling unit 123, the frequency conversion of the FM video modulation signal is not required, the channel selection by the tuner 67 (see FIG. 3) of the first embodiment is not required, and the FM video modulation signal is monitored. The circuit configuration of the dwelling unit adapter 123 is simplified by outputting only to the device 27 and by realizing the separation of the DC power source and the control signal by the duplex filter by the capacitor 125 as in the case of the collecting adapter 135. It is also possible.

  In this embodiment, the frequency example of the FM video modulation signal has been described as 12 MHz for color and 6 MHz or 18 MHz for black and white. For example, the frequency of the FM video modulation signal for monochrome is 18 MHz only. The BEF 132 in the dwelling unit adapter 123 is not necessary, and the BPF 133 may be, for example, a pass band of 11 to 21 MHz. That is, as long as the FM video modulation signal and the FM audio signal used in the collective intercom system can be separated, the filter configuration on the output side of the down converter 128 in the dwelling unit adapter 123 (in this embodiment, the BPF 130, 133 and BEF 132) is appropriately configured. be able to.

  In addition, since color video and black-and-white video are not simultaneously used in a single apartment, it is possible to set both the color FM video modulation signal and the monochrome FM video modulation signal to the same frequency (for example, 12 MHz). It is. In this case, if the monitor device 27 is configured so that both color and black and white are processed at the same frequency (for example, 12 MHz), for example, when a color FM image modulation signal of 12 MHz is input, color is used. When a video is displayed and a monochrome FM video modulation signal is input, it is possible to display a black and white video.

[Modification]
Note that the embodiment of the present invention is not limited to the above-described embodiments, and it goes without saying that various forms can be adopted as long as they belong to the technical scope of the present invention.

  For example, in the first embodiment, the frequency converter 5 is provided on the transmission line L. However, the frequency converter 5 is not provided, and all the branching devices (such as the branching device 6) provided on the transmission line L are bidirectional. You may make it comprise as a branching device. That is, for example, as shown in FIG. 13, a branching device 93 and a branching device 94 are provided on a signal input / output line, and a branching output from the branching device 93 is output via the HPF 95, and a branching output from the branching device 94. Are output via the LPF 96. However, the bidirectional branching device 92 of FIG. 13 illustrates the case where there is only one branch output. Therefore, for example, when a four-branch output type such as the branching device 6 is configured as a bidirectional type, four bidirectional branching devices 92 shown in FIG. 13 may be connected in parallel, for example. Thus, by adopting a bidirectional branching device as the branching device on the transmission line L, it is not necessary to provide the frequency converter 5. Also in the case of the second embodiment, the frequency converter 160 can be omitted as described above.

  Further, for example, in each of the above embodiments, the video controller 17 has been described as having a DC power supply function. However, the present invention is not limited to this. For example, the frequency converter 5 may have a similar DC power supply function. . Specifically, as shown in FIG. 14, an external commercial power supply (AC 100 V) is converted into a DC power supply by the power supply unit 151, and this is sent onto the transmission line L via the power supply filter 152. The power supply filter 152 is for sending the DC power only in the downstream direction. Also in the frequency converter 160 of FIG. 11 described in the second embodiment, the power supply function can be provided by providing the power supply unit 151 and the power supply filter 152 just like FIG.

  Further, for example, as shown in FIG. 15, a large-scale collective intercom system including a large number of transmission devices on the transmission line L and including a larger number of terminal terminals (individual dwelling units) than the above embodiment (FIG. 1) is constructed. In this case, it is preferable that a sufficient signal level is ensured by appropriately providing a bidirectional amplifier on the transmission line L. In FIG. 15, the bidirectional amplifiers 102 and 103 are provided on the downstream side of the distributor 111, the bidirectional amplifier 104 is provided between the branching device 6 and the distributor 113, and the bidirectional amplifier 107 is provided on the downstream side of the distributor 116. The case where the bidirectional amplifiers 105 and 106 are provided on the downstream side of the distributor 117 is shown.

  Furthermore, as a method of viewing the video captured by the monitor camera 15c in each individual dwelling unit, the first embodiment described above shows an example that can be viewed on both the monitor device 27 and the TV 23 (33), and in the second embodiment, However, for example, the monitor device 27 may not be provided and only the display on the TV 23 (33) may be provided.

  And in the said embodiment, although the case where the various signals for intercoms were transmitted between the collective entrance side and each individual dwelling unit in a collective housing was explained, it is not restricted to a collective housing, for example It can also be built between the slave units. For example, in a dwelling unit equipped with a plurality of terminal terminals, connect the entrance terminal to one of the terminal terminals (for example, the terminal terminal closest to the entrance, that is, the terminal terminal closest to the entrance terminal) via an adapter. Connect the room master to another terminal via an adapter. And what is necessary is just to provide a frequency converter in the predetermined position on the CATV transmission line between each adapter.

It is a block diagram which shows schematic structure of the collective intercom system of 1st Embodiment. It is a block diagram which shows schematic structure of the adapter for an assembly of 1st Embodiment. It is a block diagram which shows schematic structure of the adapter for dwelling units of 1st Embodiment. It is a block diagram which shows schematic structure of the frequency converter of 1st Embodiment. It is explanatory drawing which shows schematic structure of the collective entrance machine of 1st Embodiment. It is explanatory drawing which shows schematic structure of the living room main | base station of 1st Embodiment. It is explanatory drawing which shows the frequency spectrum of the various signals transmitted on the transmission line L of 1st Embodiment. It is explanatory drawing which shows the frequency spectrum of the FM audio | voice signal and FM video modulation signal (all are IF) in the adapter for dwelling units of 1st Embodiment. It is a block diagram which shows schematic structure of the adapter for an assembly of 2nd Embodiment. It is a block diagram which shows schematic structure of the adapter for dwelling units of 2nd Embodiment. It is a block diagram which shows schematic structure of the frequency converter of 2nd Embodiment. It is explanatory drawing which shows the frequency spectrum of the various signals (video | audio / audio) transmitted on the transmission line L of 2nd Embodiment. It is explanatory drawing which shows schematic structure of a bidirectional | two-way branching device. It is explanatory drawing which shows schematic structure of the frequency converter provided with the power supply function. It is explanatory drawing which shows the other example of a collective intercom system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... VHF antenna, 2 ... UHF antenna, 3 ... Satellite receiving antenna, 4 ... Booster, 5,150,160 ... Frequency converter, 6 ... Branching device, 7-10, 127 ... Divider, 8a, 9a, 10a ... Terminal terminal, 11 ... Collective entrance facility, 12, 135 ... Adapter for gathering, 13 ... Collective intercom control device, 14 ... Control room master unit, 15 ... Collective entrance machine, 15a ... Numeric keypad, 15b ... Speaker, 15d ... Display unit, 15e ... microphone, 17 ... video controller, 18 ... controller, 19 ... door lock device, 20, 30 ... individual dwelling unit, 21, 31, 123 ... dwelling unit adapter, 22, 32 ... room intercom device, 23, 33 ... TV, 26 ... Living room master, 26a ... Handset, 26b ... Speaker, 26c ... Collective entrance door lock unlocking button, 26d ... Call indicator, 27 ... Monitor device, 41, DESCRIPTION OF SYMBOLS 1,126,138 ... FM audio | voice modulation part, 42 ... Up-converter, 43, 45, 50, 62, 65, 66, 72, 143 ... HPF, 44, 49, 51, 63, 64, 69, 76, 124, 136 ... LPF, 46,67 ... tuner, 47,68 ... SAW filter, 48,70,131,142 ... FM audio demodulator, 52,77 ... CPU, 71 ... RF modulator, 73,128,139 ... down converter, 74: FM image demodulating section, 75: RF switch, 83: Mixer, 84, 129, 140: Local oscillator, 92: Bidirectional branching device, 101-107: Bidirectional amplifier, 125, 137: Capacitor, 130, 133 , 141 ... BPF, 132 ... BEF, 151 ... power supply unit, 152 ... power supply filter, L ... transmission line

Claims (18)

An intercom system provided in a house where a television joint reception system for transmitting a reception signal from a receiving antenna for receiving a broadcast radio wave to a plurality of terminal terminals via a transmission line and a signal separating means provided on the transmission line is constructed. There,
Provided at the entrance of the house, and modulates a video signal photographed by a monitor camera and outputs it as a video modulation signal, and outputs audio input from the entrance side microphone as an entrance side audio signal, and Entrance equipment configured to input a room-side audio signal output from a room master unit provided in the room and output a sound from a front-side speaker;
The room master unit configured to input the entrance side audio signal from the entrance facility and output the sound from the room side speaker, and to output the sound input from the room side microphone as the room side audio signal; ,
Based on the video modulation signal from the entrance facility, video display means for displaying video captured by the monitor camera;
Provided between the entrance facility and any one of the terminal terminals, and sends the video modulation signal from the entrance facility onto the transmission line via the terminal terminal, and transmits the entrance-side audio signal to the transmission line. From the living room master unit, which is modulated into an entrance-side audio modulation signal that is a signal in a frequency band that can be transmitted at the terminal, is sent to the transmission line through the terminal terminal, and is input through the terminal terminal. The room-side audio modulation signal obtained by modulating the room-side audio signal of the room-side audio signal is demodulated into the original room-side audio signal and sent to the entrance facility; and
The room-side audio signal from the room-base unit is provided between the room-base unit and the video display means, and any one of the terminal terminals except the terminal terminal to which the entrance-side signal relay device is connected. The room-side audio modulation signal, which is a signal in a frequency band that can be transmitted by the transmission line, is modulated and sent to the transmission line via the terminal terminal, and from the entrance-side signal relay device to the transmission line Among the video modulation signal and the entrance-side audio modulation signal input via the terminal terminal, the video-modulation signal is sent to the image display means, and the entrance-side audio modulation signal is transmitted to the original entrance side. A room-side signal relay device configured to demodulate into an audio signal and send it to the room master unit;
An intercom system characterized by comprising: The intercom system according to claim 1, wherein the room-side signal relay device is configured to output a signal received from the receiving antenna as it is, out of signals input via a terminal terminal. On the transmission line, there is provided branching means capable of branching at least part of each signal transmitted bi-directionally on the transmission line to the terminal terminal side as the signal separation means. Item 3. The interphone system according to Item 1 or 2. On the transmission line, at least branching means for branching a part of a downlink signal transmitted from the reception antenna side to the terminal terminal side as the signal separation means to the terminal terminal side is provided,
At least one of the living room master units is connected to the terminal terminal through which the downlink signal after branching by the branching unit is transmitted via the room side signal relay device,
Furthermore,
The video modulation signal that is provided on the transmission line before the reception signal from the reception antenna is first separated by the signal separation means and is transmitted from the entrance-side signal relay device on the transmission line. And the entrance side audio modulation signal is converted into a signal in a predetermined first frequency band in a predetermined downlink signal frequency band including the frequency of the received signal, and sent again on the transmission line, and the room side signal The room-side audio modulation signal transmitted from the relay device on the transmission line is converted into a signal in a predetermined second frequency band excluding the first frequency band in the downlink signal frequency band, and again on the transmission line. Comprising frequency conversion means configured to deliver to
The entrance-side signal relay device demodulates the room-side audio modulation signal after frequency conversion by the frequency conversion means into the original room-side audio signal,
The room-side signal relay device sends the video modulation signal after frequency conversion by the frequency conversion means to the video display means, and uses the entrance-side audio modulation signal after the frequency conversion as the original entrance-side audio signal. The intercom system according to claim 1, wherein the intercom system is demodulated into A bidirectional amplifier for amplifying a signal transmitted bidirectionally on the transmission path at a predetermined amplification factor is installed on the transmission path from the frequency conversion means to the terminal terminals on the transmission line. The intercom system according to claim 4. The signal separation means is configured to pass a direct current or a current in a low frequency band lower than the frequency of each signal between all signal input / output terminals included in the signal separation means,
The entrance facility is provided with power supply means for supplying DC or the low frequency band power to the outside, and the power from the power supply means is sent to the transmission line via the entrance-side signal relay device. Configured to be
The at least one of the room side signal relay device, the room base unit, or the video display means in the room is operated by the power source supplied via the transmission line. An intercom system according to any one of the above. The signal separation means is configured to pass a direct current or a current in a low frequency band lower than the frequency of each signal between all signal input / output terminals included in the signal separation means,
The frequency conversion means includes a power supply means for supplying DC or the low frequency band power to the outside,
At least one of the room-side signal relay device, the room base unit, or the video display means in the living room is operated by the power supplied from the power supply means via the transmission line. The intercom system according to claim 4 or 5. The entrance facility outputs an entrance-side control signal for controlling the operation of the room master, and operates based on the room-side control signal when a room-side control signal is received from the room master.
The living room base unit outputs the living room side control signal for controlling the operation of the entrance facility, and when receiving the entrance side control signal from the entrance facility, operates based on the entrance side control signal,
The entrance-side signal relay device sends the entrance-side control signal from the entrance facility to the transmission line through the terminal terminal, and the room-side control signal input through the terminal terminal to the entrance facility. Output,
The room-side signal relay device sends a room-side control signal from the room-main unit to the transmission line via the terminal terminal, and transmits the entrance-side control signal input through the terminal terminal to the room-parent control signal. The intercom system according to claim 1, wherein the intercom system is output to a machine. The intercom system according to claim 8, which refers to claim 6 or 7,
The interphone system, wherein the control signal has a frequency within the low frequency band. The house is an apartment house composed of a plurality of dwelling units in which at least one terminal terminal is disposed,
The entrance facility includes a dwelling unit designating unit for designating any one of the plurality of dwelling units, and an identification signal corresponding to the dwelling unit designated by the dwelling unit designating unit is one of the entrance side control signals. Is configured to output as
The said room main unit performs audio | voice output by the said room side speaker, only when the said identification signal input via the said room side signal relay apparatus shows itself. The intercom system according to 8 or 9.   11. The intercom system according to claim 10, wherein the living room master unit or the living room side signal relay device permits video output by the video display means only when the identification signal indicates itself. . The living room base unit includes an unlocking means for outputting an unlocking signal for unlocking a locking device of a collective entrance door constituting the entrance facility onto the transmission line as one of the room side control signals,
The locking device is unlocked based on the input unlocking signal when the unlocking signal transmitted through the transmission line is input to the entrance equipment via the entrance signal relay device. It is comprised as follows. The intercom system in any one of Claims 8-11 characterized by the above-mentioned. The intercom system according to claim 1, wherein the signal relay device is used as the entrance-side signal relay device,
First video modulation signal sending means for sending the video modulation signal from the entrance facility to the terminal terminal side;
Entrance audio modulation means for modulating the entrance side audio signal from the entrance facility into the entrance side audio modulation signal;
A room audio demodulation means for demodulating the room side audio modulation signal input via the terminal terminal into the room side audio signal;
A signal relay device comprising: The intercom system according to claim 4, wherein the signal relay device is used as the entrance-side signal relay device,
The signal relay apparatus according to claim 13, wherein the room audio demodulation unit demodulates the room side audio modulation signal after the frequency conversion by the frequency conversion unit into the original room side audio signal. The intercom system according to claim 1, wherein the intercom system is a signal relay device used as the room side signal relay device,
A room audio modulation means for modulating the room side audio signal from the room base unit into the room side audio modulation signal;
A second video modulation signal sending means for sending the video modulation signal inputted through the terminal terminal to the room master unit;
Entrance audio demodulation means for demodulating the entrance-side audio modulation signal input via the terminal terminal into the entrance-side audio signal;
A signal relay device comprising:   16. The signal relay apparatus according to claim 15, further comprising reception signal passing means for outputting a reception signal from the reception antenna as it is out of signals input through the terminal terminal. The intercom system according to claim 4, wherein the intercom system is a signal relay device used as the room side signal relay device,
The entrance audio demodulation means demodulates the entrance side audio modulation signal after frequency conversion by the frequency conversion means into the original entrance side audio signal,
The signal relay device according to claim 15 or 16, wherein the second video modulation signal sending means sends the video modulation signal after frequency conversion by the frequency conversion means to the video display means.   The signal relay device according to any one of claims 15 to 17, wherein the signal relay device is configured to be operated by a power source supplied from the transmission line via the terminal terminal.

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