TWI507010B - Communication system and apartment building intercom system - Google Patents

Description

Communication system and integrated residential walkie-talkie system

The present invention relates to a communication system and an interphone system for a collective residence.

The conventional communication system is, for example, a shared-seat intercom system in which a shared-station unit (a Lobby intercom) installed in a shared entrance of a collective house; a household unit installed in each household; and a shared unit A trunk line distribution device that is connected to a hall intercom and connected to a plurality of household trunks (refer to Japanese Patent Application Laid-Open No. 2010-178073). A plurality of splitters are connected to each household trunk, and the households of each household are connected to the household line that is diverged from the household trunk by means of the splitters.

However, a large-scale mansion composed of a plurality of buildings, etc., will divide a plurality of system trunks (sub trunks) from one main line (trunk line) to each building. For example, the first floor of each building is connected by the main line, and the upper level households are connected by the secondary trunks established from the first floor of each building. At this time, when the households on the first floor of each building are allocated to the sub trunks from the main line by the distributor, the problem is caused by the large distribution loss of the sub trunk lines. In addition, there is a conventional example in which a relay is used to selectively connect and connect trunk lines of a plurality of systems. However, in the above conventional example, trunk lines (trunk lines and sub trunk lines) of a plurality of systems cannot be simultaneously communicated. Use is limited and becomes a problem.

The present invention is directed to the foregoing problems, and aims to allow the trunks of the complex system to communicate at the same time and to reduce the loss of the trunk lines of the various systems.

The invention communicates with a plurality of communication terminals via a communication path The communication system formed by the way. The communication path has: a secondary trunk of a complex system, and one or a plurality of communication terminals are connected to each other; and a trunk line is connected to the secondary trunk of the complex system via a plurality of system adders. Each of the plurality of system adders includes a pair of main line connecting portions that are inserted in series along the main line, a sub trunk connecting portion to which a sub trunk to the system adder is connected, and a branch circuit for circulating The signal between the pair of main line connecting portions is branched to the aforementioned sub trunk connecting portion.

In one embodiment, the communication terminal includes a transmission processing unit configured to transmit a signal of digital modulation (Digital Modulation).

In one embodiment, the transmission processing unit is configured to perform multi-carrier adaptive modulation.

In one embodiment, the diverging circuits of the plurality of system adders are formed by dividing the sum of the divergence losses of all the system adders connected in series to the main line to the total system adders.

In one embodiment, the system adder includes: a plurality of divergent circuits having different divergence losses; and a switching unit configured to switchably connect the plurality of divergent circuits to the sub trunk connection unit.

In one embodiment, the system adder includes a bypass circuit for allowing a power supply current superimposed on the main line to pass through the sub-trunk without passing through the diverging circuit.

In one embodiment, an impedance (Impedance) integration terminator is connected to the terminal of the sub trunk.

In one embodiment, the communication system has a repeater for relaying the communication signal.

In one embodiment, the repeater includes: a connection terminal connected to the terminal of the sub trunk; and a receiving unit that receives the communication via the connection terminal And the transmitting unit transmits the communication signal via the connection terminal; the receiving unit and the transmitting unit are connected in parallel with respect to the connection terminal.

In one embodiment, the repeater includes: a pair of connection terminals connected to the main line; and a pair of receiving portions each receiving a communication signal via the connection terminal; and a pair of signaling units respectively passing through the The terminal is connected to transmit a communication signal; and the modulation/demodulation unit is configured to perform a modulation/demodulation process on the communication signal; the pair of receiving portions and the pair of signaling portions are opposite to each other; The parallel modulation/demodulation sections are connected in parallel.

In one embodiment, the system adder includes a casing that houses the trunk line connecting portion, the sub trunk connecting portion, and the branch circuit. Further, the repeater is housed in the outer casing.

In the intercom system for a collective house according to the present invention, the communication terminal includes: a shared terminal, which is installed at a shared residence of the collective house; a resident terminal, which is installed at each household of the collective house; and a trunk control terminal at the terminal of the shared terminal and the aforementioned The communication signal is relayed between the household terminals; at least the communication signal is used to transmit the voice of the call.

The communication system and the integrated residential walkie-talkie system of the present invention have the effect of allowing the trunk lines of the plurality of systems to communicate at the same time and reducing the loss of the trunk lines of the respective systems.

Preferred embodiments of the present invention are described in more detail below. Other features and advantages of the present invention will be understood in the appended claims.

Hereinafter, an embodiment in which the technical idea of the present invention is applied to a walkie-talkie system for a collective house will be described in detail. However, the communication system to which the technical idea of the present invention can be applied is not limited to the intercom system for a residential house, and may be adapted. It is used to integrate communication systems other than the intercom system for residential use.

(Embodiment 1)

As shown in FIG. 1A, the intercom system for a collective house according to the present embodiment includes a shared terminal (hall intercom) C installed in a shared entrance (hall) of a collective house, and households installed in each household of the collective house. Terminal (communication terminal) A, and trunk control terminal B. A plurality of household terminals A and hall walkie-talkie C are connected by a communication path via the trunk control terminal B. The communication path is composed of the following components: the common part trunk line LC is connected to the hall intercom C and the trunk control terminal B; the main line LA, one end (the first end) is connected to the main line control terminal B, and the other end (the second end) The terminator E is used as the terminal; the plurality of sub-trunks LB1, LB2, ..., LBn are each added (divided) to the main line LA by a plurality of system adders ((1) splitters); The plurality of household lines LD are branched from each other by the plurality of (second) splitters D from the sub trunk lines LBi (i = 1, 2, ..., n). In addition, the communication path is composed of a balanced 2-wire communication cable.

Hall walkie-talkie C is equipped with a camera, microphone, and speaker that can be used to capture visitors, and a ten-key switch (Ten Key Switch) or touch panel for visitors to enter the household number of the interviewed household. A transmission unit or the like that allows sound or video to be transmitted by packet via a communication path. The hall intercom C is a package that stores the household number in the field and the visitor to be photographed by the photographing device after the ten-key keyboard or the touch panel is operated to receive the input of the household number of a household. The image (image information) is stored in the packet of the data column, and is transmitted (packetized and transmitted) to the address of the trunk control terminal B via the shared portion trunk line LC.

The trunk control terminal B memorizes the correspondence between the address of the household terminal A assigned to each household and the household number of the household. Then, the trunk control terminal B converts the household number stored in the data column in the packet received from the hall intercom C into the address according to the correspondence, stores the address in the address field, and will come from The call instruction for the call notification of the hall intercom C is stored in the data column and the packet containing the video information stored in the data column is sent to the main line LA.

The household terminal A includes a control unit 1, a transmission processing unit 2, a call processing unit 3, a microphone 4, a speaker 5, an A/D converter 6, a D/A converter 7, an image processing unit 8, a display unit 9, and an operation. The input unit 10 and the like are input. Converting the sound collected by the microphone 4 into an electrical signal (audio signal), and outputting an analog sound signal (sending voice signal) output from the microphone 4 into a digital sound signal (sending voice data) via the A/D converter 6 and It is input to the call processing unit 3. Further, the digital audio signal (the received voice data) outputted from the call processing unit 3 is converted into an analog sound signal (the received voice signal) via the D/A converter 7. An analog sound signal output from the D/A converter 7 is input to the speaker 5, and a sound (received sound) is emitted from the speaker 5.

The call processing unit 3 includes an audio switch, an echo canceller, and the like, and performs signal processing on the received audio signal input from the transmission processing unit 2 and the transmitted audio signal input from the A/D converter 6, thereby suppressing Howling. Or echo to achieve a good hands-free call. Further, the transmitted voice signal processed by the call processing unit 3 is output to the transmission processing unit 2.

The display unit 9 includes a display device such as a liquid crystal display or an organic electroluminescence (EL) display, and a drive circuit (not shown) that drives the display device to develop an image. The video processing unit 8 reconstructs the original video from the video signal (image data) output from the transmission processing unit 2, and displays the reconstructed video on the display unit 9.

The control unit 1 is composed of a hardware such as a CPU or a memory, and various programs (software) executable by the CPU. The operation input receiving unit 10 has an input device such as a touch panel or a key switch, and operates the input device to receive various operation inputs, and outputs operation signals corresponding to the respective operation inputs to the control unit 1 . For example, a response button (not shown) is disposed in front of the housing of the household terminal A. When the response button is pressed, the operation input receiving unit 10 receives an operation input and outputs an operation signal for response. In the control unit 1, when an operation signal is input from the operation input receiving unit 10, processing corresponding to each operation signal (described later) is performed.

The transmission processing unit 2 performs packet transmission between the trunk control terminal B or another household terminal A via a communication path. The transmission processing unit 2 divides the control signal (control data) made by the control unit 1 into a packet (control packet), and similarly transmits the voice signal (sending voice data) made by the call processing unit 3. Divided into packets (sound packets). Furthermore, the transmission processing unit 2 encodes the control packet or the audio packet, converts the encoded bit string into an electrical signal (modulation), and discharges it to the resident line LD. Further, the transmission processing unit 2 converts the electrical signal flowing through the household line LD into a bit string (demodulation), and decodes the packet (sound packet, control packet, and video packet) from the demodulated bit string. Further, in the transmission processing unit 2, when the address of the decoded packet does not match the address of its own (address of the resident terminal A), the packet is discarded, and when the address is the same, the data column of the packet is included. The data is outputted separately, that is, the video data (video signal) is output to the video processing unit 8, the control data (control signal) is output to the control unit 1, and the audio data (audio signal) is output to the call processing unit 3.

As shown in FIG. 1B, the system adder F includes a first main line connecting portion (first main connecting portion) 20 including first and second main line connecting terminals 20A and 20B, and includes first and second mains. The second main line connecting portion (second main connecting portion) 21 of the trunk connecting terminals 21A and 21B and the sub trunk connecting portion (sub connecting portion) 22 including the first and second sub trunk connecting terminals 22A and 22B. The first and second main line connecting portions 20 and 21 are inserted in series along the trunk line LA so as to connect the first line (First Line) and the second main line between the first main line connecting terminals 20A and 21A. The second line (Second Line) between the connection terminals 20B and 21B constitutes one of the two-line main lines LA. The sub trunk line connecting portion 22 is connected to the sub trunk line LBi. That is, the main line connecting portions 20, 21 are each provided with a pair of main line connecting terminals 20A, 20B, 21A, 21B, and the main line connecting terminals (20A and 21A, 20B and 21B) are also electrically connected. Further, the system adder F is provided with a branch circuit 23 for diverging signals flowing between the main line connecting portions 20 and 21 to the sub trunk line connecting portion 22.

The branch circuit 23 includes a transformer T, a resistor R1 and a capacitor C1 connected to one end of the primary winding line (first end) connected in series to the transformer T and the main line connection terminals 20A and 21A (first line), and are connected in series The resistor R2 and the capacitor C2 between the other end of the primary winding wire of the transformer T and the main line connecting terminals 20B and 21B (the second line) and the capacitor C2 are connected in series to the secondary winding end of the transformer T (the first end) The capacitor C3 between the sub-trunk connection terminal 22A and the capacitor C4 connected in series with the other end (second end) of the secondary winding of the transformer T and the sub trunk connection terminal 22B. Here, in the branch circuit 23, the amount of attenuation when the communication signal input from the main trunk connection portion 20 (or 21) of one side is output from the main line connection portion 21 (or 20) on the other side (for example, 0.5 dB) The attenuation amount (for example, 10 dB) when the communication signal input from the main line connecting portions 20 and 21 is output from the sub trunk line connecting portion 22 is smaller. That is, the sub trunk line connecting portion 22 has a high impedance as viewed from the main line connecting portions 20 and 21.

Fig. 2 is a circuit diagram of each of the splitters D of the present embodiment. The splitter D shown in Fig. 2 has the same structure as the system adder F. In other words, the splitter D includes the first main connecting portion D1 including the first and second connecting terminals D11 and D12, the second main connecting portion D2 including the first and second connecting terminals D21 and D22, and the first main connecting portion D2. And the sub-connecting portion D3 of the second sub-connection terminals D31 and D32. The divergence circuit D23 for diverging the signal flowing between the main connecting portions D1 and D2 to the sub-connecting portion D3 is basically the same as the divergent circuit of the system adder F, and will not be described in detail herein.

Next, the walkie-talkie call between the resident terminal A and the hall walkie-talkie C will be described. In the hall walkie-talkie C, when a visitor operates a ten-key keyboard or a touch panel and receives an operation input of a household number of a household, the package of the household number is stored in the data column, and the visitor image taken by the photographing device is recorded. (Image data) The packet stored in the data column is transmitted to the address of the trunk control terminal B (packet transmission) via the sharing unit trunk line LC. The trunk control terminal B sends a control packet for notifying the call instruction for calling from the hall intercom C to the data column and the video packet for storing the video data in the data column to the main line LA.

In the household terminal A installed in the household address of the household number, after receiving the control packet and the video packet by the transmission processing unit 2 via the trunk line LA, the secondary trunk LBi, and the household line LD, the call stored in the data column of the control packet is received. The command (control signal) is output to the control unit 1, and the image data stored in the data column of the image pack is output to the image processing unit 8. The control unit 1 issues a call sound from the speaker 5 after receiving the call command. Further, the video processing unit 8 processes the video signal received from the transmission processing unit 2, and displays the image of the visitor on the display unit 9. Then, after the resident who has heard the call sound confirms the visitor image appearing on the display unit 9 of the resident terminal A, the operation response key is operated, and the operation signal corresponding to the operation input of the response key is output from the operation input receiving unit 10. The control unit 1 that has received the operation signal starts the call processing unit 3, and transmits the audio signal (sending voice signal) output from the microphone 4 from the transmission processing unit 2 for packet transmission. As a result, the resident and the visitor can use the household terminal A and the hall walkie-talkie C to make a walkie-talkie call.

Then, during the intercom call, the answer button of the resident terminal A is pressed, and the operation signal is output from the operation input receiving unit 10 to the control unit 1. The control unit 1 stops the call processing unit 3, the video processing unit 8, and the transmission processing unit. 2, and end the walkie-talkie call. However, even when the operation answer key is not pressed, the control unit 1 stops the call processing unit 3, the video processing unit 8, and the transmission processing unit 2 from the time when the call has elapsed for a certain period of time (for example, several minutes), and ends. Walkie talkie. Further, in the present embodiment, even if the resident terminal A of the different households can perform the intercom call via the trunk control terminal B, basically the same procedure as that of the intercom call between the hall intercoms C is performed, and thus the description thereof will be omitted.

In the present embodiment as described above, the sub-main line LB is branched from the main line LA by the system adder F having the branch circuit 23, and the loss of each sub-line LB can be reduced as compared with the case where the distribution is performed using the distributor. . Further, the secondary trunk line LB is always connected to the trunk line LA via the system adder F. For example, a multicast or broadcast communication signal from the trunk control terminal B flows through all the trunk lines LBi. It is possible to communicate at the same time. Furthermore, since the communication between the main line control terminal B and the plurality of household terminals A can be performed simultaneously (in parallel), for example, the intercoms can be made via the main line control terminal B between the household terminals A of different households. Further, in the present embodiment, the terminal E for impedance integration is connected to the terminals of the main line LA and the sub-line LBi, and signal reflection at the terminals of the main line LA and the sub-line LBi can be suppressed.

However, compared to the line length of the communication path (the shared part trunk line LC) for connecting the hall walkie-talkie C and the trunk control terminal B, the communication path for connecting the trunk control terminal B and each household terminal A (main line LA, vice The line length of the trunk line LBi and the household line LD) is much longer than that of the former, and it is easy to increase the transmission loss or the communication quality is likely to be degraded due to the mixing of noise. Therefore, in the present embodiment, when packet transmission is performed between the transmission processing unit 2 of the household terminal A and the trunk control device C, a multi-carrier adaptive modulation method is adopted, and noise can be obtained for each subcarrier (Subcarrier). The level is measured and the modulation mode (multi-value modulation in digital modulation), the error-corrected coding rate, and the communication mode of the carrier used are selected and set. By adopting the multi-carrier adaptability modulation method as described above, even if the transmission loss deviation in the communication band domain is large, or if the narrow-band noise is mixed, the S/N ratio will be When there is a large difference in frequency, the quality of communication can be suppressed.

Here, preferably, the divergent circuit 23 is formed in such a manner that the sum of the divergence losses of all the system adders F connected in series to the main line LA is equally distributed to the entire system adders F. For example, when the upper limit of the number of connected units of the system adder F is n, the divergence loss in the divergent circuit 23 of each system adder F can satisfy the relationship of 10 log10{1/(n-i+1)}. Similarly, the circuit constants of the resistors R1, R2 or the capacitors C1 to C4 are set (where i is the number of the sub trunk line LBi, i = 1, 2, ..., n). Therefore, if the upper limit of the number of connected stations is 15, the divergence loss in the divergent circuit 23 of the system adder F closest to the mains control terminal B is 10 log 10 (1/15) decibels, and the divergence of the second close system adder F The divergence loss in the circuit 23 is 10 log 10 (1/14) decibels, and the divergence loss in the divergent circuit 23 of the farthest system adder F is 10 log 10 (1/1) decibels. As described above, the sum of the divergence losses of all the system adders F connected in series to the main line LA is equally distributed to the entire system adders F, so that the signal levels of the communication signals diverging to the respective sub-lines LBi are approximately the same.

However, it is known that the optimum value of the divergence loss in the divergent circuit 23 of the system adder F is determined to be almost proportional to the number of sub-trunks LBi (the number of system adders F) which are different from the main line LA. increase. Therefore, when the resistance values of the resistors R1 and R2 constituting the branch circuit 23 of the system adder F are fixed, the divergence loss is also fixed. Therefore, it is difficult to optimize the divergence loss of each system amplifier F.

Therefore, as shown in FIG. 3, a resistor R1j and a capacitor C1j are connected between one end (first end) of the primary side winding of the transformer T and the main line connection terminals 20A and 21A (first line). a plurality of (three in the illustrated example) series circuit and switch SW1; a resistor R2j is connected between the other end (second end) of the primary winding and the main line connecting terminals 20B and 21B (second line) A plurality of capacitors C2j (three in the illustrated example) are connected in series with the switch SW2 (where j = 1, 2, 3). That is, by switching between the two changeover switches SW1 and SW2, the resistance values of the resistors R1j and R2j inserted between the primary side winding wire of the transformer T and the main line connection terminals 20A, 21A and 20B, 21B can be changed, and the difference can be adjusted. The divergence loss in circuit 23. As a result, the divergence loss most suitable for the system can be easily set. Here, the system adder F of FIG. 3 is composed of a plurality of series circuits (R1j and C1j) and a plurality of series circuits (R1j and C1j), and has a plurality of divergent circuits having different divergence losses, and the switches SW1 and SW2 are switched. A switching unit for selectively switching one of a plurality of branch circuits to the sub trunk line connecting unit 22 is formed. In addition, the switch SW1, SW2 can also be switched by manual or by an electrical signal by a relay. Further, the number of series circuits of the resistors R1j and R2j and the capacitors C1j and C2j is not limited to three, and may be two or four or more.

However, the household terminal A, the trunk control terminal B, and the hall intercom C are provided with a power supply circuit that converts AC power supplied from the commercial power source into DC power. However, depending on the system structure of the communication system, the communication terminal may also be placed in a place where it is difficult to supply power from a commercial power source. At this time, it is preferable to superimpose the DC current for power supply in the communication path, and supply the DC current to the communication terminal. Then, in order to prevent the DC current superimposed on the communication path from being depleted by the resistors R1j, R2j in the diverging circuit 23 of the system adder F, and passing the direct current through the sub trunk connection terminal, the system adder F as shown in FIG. Further, a bypass circuit is provided which is connected to the inductor L1 connected between the sub trunk connection terminal 22A and the first line (in parallel with the series circuit such as the resistor R1 and the capacitors C1 and C3), and is connected to the sub-coupler. The inductor L2 is connected between the trunk connection terminal 22B and the second line (in parallel with the series circuit of the resistor R2 and the capacitors C2, C4, etc.). The inductors L1 and L2 have sufficiently high impedance with respect to the carrier wave frequency (frequency of the subcarrier) of the communication signal, so that the communication signal is hardly affected.

(Embodiment 2)

The intercom system for a dwelling house according to the present embodiment has a repeater G configured to relay a communication signal as shown in FIG. 5. In addition, the system configuration other than the repeater G is the same as that of the first embodiment, and the components common to the first embodiment are appropriately illustrated with the same reference numerals, and the description thereof is omitted.

The repeater G includes a first connection terminal 30, a second connection terminal 31, a modulation/demodulation unit 32, a relay processing unit 33, (first and second) receiving units 34 and 35, and ( The first and second) signaling units 36 and 37, and the like. The one side (first) connection terminal 30 is connected to the trunk line LA on the trunk control terminal B side (hereinafter referred to as the upstream side), and the other (second) connection terminal 31 is connected to the terminator E side (hereinafter referred to as As the downstream side, the main line LA. That is, each of the connection terminals 30 and 31 includes the first and second terminals to which the two-line main line LA is connected. The relay processing unit 33 rewrites the source address of the communication signal received from the upstream main line LA to its own address and transmits it to the trunk line LA (relay) on the downstream side, from the downstream main line. The source address of the communication signal received by LA is rewritten from its own address to the address of the trunk control terminal B or the upstream side resident terminal A, and then transmitted to the trunk line LA (relay) of the upstream side. The modulation/demodulation unit 32 digitally demodulates the communication signal received by the reception terminal Rx and outputs it to the relay processing unit 33, and digitally modulates the packet output from the relay processing unit 33. Sent by the sender Tx. The receiving units 34 and 37 are each composed of an amplifier inserted between the connection terminals 30 and 31 and the receiving end Rx of the modulation/demodulation unit 32, and the transmitting units 35 and 36 are respectively inserted into the connection terminals 30. The 31 is composed of an amplifier between the transmitting end Tx of the modulation/demodulation unit 32. That is, the communication signal flowing in from the upstream connection terminal 30 is received (amplified) by the reception unit 34 connected to the first and second terminals of the connection terminal 30, and the modulation/demodulation unit 32 and After the relay processing unit 33 performs the relay processing, it is sent (amplified) by the signal transmitting unit 36 connected to the first and second terminals of the connection terminal 31, and then sent out from the downstream connection terminal 31. Similarly, the communication signal flowing in from the connection terminal 31 on the downstream side is received (amplified) by the reception unit 37, and is relayed by the modulation/demodulation unit 32 and the relay processing unit 33. The signal transmitting unit 35 sends (amplifies) and sends it out from the upstream connection terminal 30.

Then, the transmission loss caused by the relay of the communication signal flowing through the trunk line LA via the relay G can be improved, and the wiring length of the trunk line LA can be compared to the case where the repeater G is not used. Extend, or increase the number of system adders F that the main line LA can connect. Further, in the repeater G of the present embodiment, the modulation/demodulation unit 32 is shared by the upstream side and the downstream side, so that the size can be reduced, and it can be easily installed even in a narrow place.

However, as shown in FIG. 6, the repeater G may be connected to the terminal of each of the sub trunks LBi instead of the terminator E. The repeater G may have a set of the connection terminal 30, the receiving unit 34, and the transmitting unit 35. Even in the configuration shown in FIG. 6, the transmission loss caused by the relay of the communication signal flowing through the sub trunk line LBi via the repeater G can be improved, so that it can be compared with the case where the repeater G is not used. The length of the wiring of the main line LA is extended, or the number of system adders F that the main line LA can be connected is increased. Further, the repeater G only needs to have one set of the connection terminal 30, the receiving unit 34, and the transmitting unit 35, and can be further downsized.

(Embodiment 3)

The intercom system for a collective house of the present embodiment is characterized in that it has an amplifier H for amplifying a communication signal flowing through a communication path, and the other system configurations are the same as those of the first embodiment. The amplifier H can be replaced with the repeater G of FIG. The constituent elements that are the same as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 7, the amplifier H includes first and second amplifiers 40 and 41, and first and second power supply separating units 42 and 43. The first amplifier 40 amplifies the downstream communication signal (the communication signal flowing toward the right side in FIG. 7; the same below), and the second amplifier 41 will flow to the upstream communication signal (the communication signal flowing toward the left side in FIG. 7; Same) zoom in. Further, the input terminal of the first amplifier 40 is connected to the output terminal of the second amplifier 41, and the output terminal of the first amplifier 40 is connected to the input terminal of the second amplifier 41.

The first power supply separating unit 42 separates the DC component of the communication terminal (the trunk control terminal B or the household terminal A) that transmits the downstream communication signal, and superimposes the DC component of the communication path, and causes the first amplifier 40 by the DC component. Actuate. Similarly, the second power supply separating unit 43 separates the DC component of the communication terminal (the trunk control terminal B or the household terminal A) that transmits the upstream communication signal, and superimposes the DC component of the communication path, and makes the DC component 2 amplifier 41 is activated. That is, when the communication terminal (the trunk control terminal B or the household terminal A) that is the source of the communication signal transmits the communication signal flowing downstream and simultaneously superimposes the direct current on the communication path, the first power supply separation unit 42 causes the first The amplifier 40 is activated, so that the downstream communication signal can be amplified by the amplifier H. At this time, since the DC current is not superimposed on the output side of the first amplifier 40, the second power supply separating unit 43 does not operate the second amplifier 41, and the communication signal does not flow backward toward the upstream. On the contrary, when the communication terminal (the trunk control terminal B or the household terminal A) which is the source of the communication signal transmits the communication signal flowing upstream and simultaneously superimposes the direct current on the communication path, the second power supply separation unit 43 causes Since the second amplifier 41 is activated, the upstream communication signal can be amplified by the amplifier H. At this time, since the direct current does not overlap on the output side of the second amplifier 41, the first power supply separating unit 42 does not operate the first amplifier 40, and the communication signal does not flow backward toward the downstream.

In the above embodiment, the communication signal attenuated during the communication path can be amplified by the amplifier H, so that the wiring length of the main line LA can be extended, or the system adder to which the main line LA can be connected can be increased. The number of F. Further, the ON/OFF of the first and second amplifiers 40 and 41 can be switched by the presence or absence of a DC current superimposed on the communication path, and the configuration can be simplified as compared with the case where the control signal is used. In addition, the amplifier H can also be inserted into either the main line LA or the sub trunk line LBi.

(Embodiment 4)

The amplifier H of the third embodiment performs ON/OFF control of the first and second amplifiers 40 and 41 by a direct current superimposed on the communication path (main line LA or sub-line LBi), but may overlap with the communication. The first and second amplifiers 40 and 41 are malfunctioning due to the noise component of the path.

Therefore, the amplifier H of the present embodiment switches the ON/OFF operation by a control signal issued from a communication terminal as a communication source of the communication signal. Specifically, the first and second control signal receiving units 44 and 45 are provided, which can receive the control signal transmitted through the communication path (the main line LA or the sub-line LBi) as shown in FIG. 8A, or receive the picture. The control signal transmitted by the dedicated communication line LS shown in 8B. In addition, the system configuration other than the amplifier H and the basic configuration of the amplifier H are the same as those in the third embodiment, and the same components as those in the third embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The first and second control signal receiving units 44 and 45 turn the first and second amplifiers 40 and 41 ON (activated) or OFF (non-actuated) based on the control command included in the received control signal. Further, the control signal includes a symbol for indicating which of the first amplifier 40 and the second amplifier 41 the control command is for. That is, even if the control signal is transmitted via the communication path, there is no need to worry about the erroneous operation of the second amplifier 41 due to the control command for the first amplifier 40, or the error of the first amplifier 40 due to the control command for the second amplifier 41. Actuate.

In the above-described embodiment, as in the third embodiment, the communication signal attenuated during the communication path can be amplified by the amplifier H, so that the wiring length of the main line LA can be lengthened, or the main line LA can be increased. The number of connected system adders F. Further, the ON/OFF of the first and second amplifiers 40 and 41 is switched in accordance with the control signal transmitted via the communication path or the dedicated communication line LS, and is switched compared to the presence or absence of the superimposed DC current. In case of the situation, it has the advantage of improving the noise resistance. In addition, the amplifier H can also be inserted into either the main line LA or the sub trunk line LBi.

(Embodiment 5)

As shown in FIG. 9, the amplifier H of the present embodiment includes a first hybrid circuit 46 for distributing a communication signal to the upstream, a second hybrid circuit 47 for distributing a downstream communication signal, and A bidirectional amplifying circuit that amplifies the communication signal distributed by the first mixing circuit 46 and the second mixing circuit 47.

The first hybrid circuit 46 is composed of transformers T2 to T5 and resistors R3 and R4. The terminals (first and second terminals) of the first input/output terminal portion 46A are connected to transformers T2 and T3 connected in parallel. One terminal (first terminal) of the second input/output terminal portion 46B is connected to one end (first end) of the transformer T4 and the resistor R3, and the other terminal (second terminal) of the second input/output terminal portion 46B is connected. It is connected to one end (first end) of the transformer T5 and the resistor R4. One terminal (first terminal) of the third input/output terminal portion 46C is connected to the other end (second end) of the transformer T4 and the resistor R3, and the other terminal (second terminal) of the third input/output terminal 46C is connected. It is connected to the other end (second end) of the transformer T5 and the resistor R4.

Similarly to the second mixing circuit 47, the transformers T6 to T9 and the resistors R5 and R6 are formed, and the terminals (the first and second terminals) of the first input/output terminal portion 47A are connected to the transformers T8 and T9 connected in parallel. One terminal (first terminal) of the second input/output terminal portion 47B is connected to one end (first end) of the transformer T6 and the resistor R5, and the other terminal (second terminal) of the second input/output terminal portion 47B is connected. It is connected to one end (first end) of the transformer T7 and the resistor R6. The one-side terminal (first terminal) of the third input/output terminal portion 47C is connected to the other end (second end) of the transformer T7 and the resistor R6, and the other terminal (second terminal) of the third output-input terminal portion 47C. ) is connected to the other end (second end) of the transformer T6 and the resistor R5.

The bidirectional amplifier circuit is inserted into the first amplifier 48 between the second input/output terminal portions 46B and 47B of the first and second hybrid circuits 46 and 47, and the first and second hybrid circuits 46 and 47. 3 is formed by the second amplifier 49 that is input and output between the terminal portions 46C and 47C.

Here, the resistors R3 to R6 are resistors for determining the output impedance of the second amplifier 49, and can absorb unbalanced power. The function of the transformers T4 to T7 is to assign a signal to 2 or to mix 2 signals into 1. Further, the transformers T2 and T3 are used to perform impedance integration of the first input/output terminal portion 46A of the first hybrid circuit 46. Similarly, the transformers T8 and T9 are used to perform impedance integration of the first input/output terminal portion 47A of the second hybrid circuit 47.

Then, the communication signal input from the first input/output terminal portion 46A of the first mixing circuit 46 is equally divided into two signal components, and is output to the second input/output terminal portion 46B and the third input/output terminal portion 46C.

The signal component outputted to the third input/output terminal unit 46C is amplified by the forward-connected amplifier 49, and is input to the third output-in terminal portion 47C of the second hybrid circuit 47.

On the other hand, the amplifier 48 is connected to the second input/output terminal unit 46B, and the signal component output from the second input/output terminal unit 46B does not flow to the second output/output terminal portion 47B of the second hybrid circuit 47.

The communication signal input to the third input/output terminal portion 47C of the second mixing circuit 47 is again output from the first output terminal 47A of the second mixing circuit 47 via the second mixing circuit 47.

At this time, there is a reverse coupling attenuation amount between the third input/output terminal portion 47C of the second mixing circuit 47 and the second input/output terminal portion 47B, and the signal component input to the third input/output terminal portion 47C overflows to the first The amount of the input/output terminal portion 47B is relatively small. However, in order to prevent signal vibration, the inverse combined attenuation of each hybrid circuit is -A [dB], and the gain of amplifier 49 and amplifier 48 must not exceed 2 A [dB].

Similarly, the communication signal input from the first input/output terminal portion 47A of the second mixing circuit 47 is distributed by the second mixing circuit 47, and the signal component output from the second input/output terminal portion 47B is passed through the amplifier 48. After amplification, the first output/output terminal portion 46A of the first mixing circuit 46 is output.

As described above, in the present embodiment, as in the third embodiment or the fourth embodiment, the amplifier H is used to amplify the communication signal that is attenuated during the communication path, so that the wiring length of the main line LA can be made. Extend, or increase the number of system adders F that the main line LA can connect. Further, in the present embodiment, it is not necessary to perform ON/OFF control of the amplifiers 40 and 41 provided in the amplifier H as in the third embodiment or the fourth embodiment, and it is advantageous in that the system configuration is simplified and the erroneous operation is suppressed.

However, the system adder F has a casing 24 that houses a pair of main trunk connecting portions 20 and 21 and a sub trunk connecting portion 22 and a branch circuit 23. The outer casing 24 is composed of, for example, a box-shaped synthetic resin molded body. Next, the repeater G or the amplifier H may be housed in the casing 24 of the system adder F (refer to FIG. 10).

The preferred embodiments of the present invention have been described above, but without departing from the spirit and scope of the present invention, that is, without departing from the scope of the claims Under the circumstance, the industry can still carry out various corrections and deformations.

1‧‧‧Control Department

2‧‧‧Transfer Processing Department

3‧‧‧Call Processing Department

4‧‧‧ microphone

5‧‧‧Speakers

6‧‧‧A/D converter

7‧‧‧D/A converter

8‧‧‧Image Processing Department

9‧‧‧Display Department

10. . . Operation input receiving unit

20. . . 1st trunk line connection

20A. . . 1st main line connection terminal

20B. . . 2nd main line connection terminal

twenty one. . . 2nd trunk line connection

21A. . . 1st main line connection terminal

21B. . . 2nd main line connection terminal

twenty two. . . Secondary trunk connection

22A. . . First sub trunk connection terminal

22B. . . Second sub trunk connection terminal

twenty three. . . Bifurcation circuit

twenty four. . . shell

30. . . First connection terminal

31. . . Second connection terminal

32. . . Modulation/demodulation unit

33. . . Relay processing unit

34. . . Receiving department

35. . . Receiving department

36. . . Ministry of Communications

37. . . Ministry of Communications

40. . . First amplifier

41. . . Second amplifier

42. . . First power supply separation unit

43. . . Second power supply separation unit

44. . . First control signal receiving unit

45. . . Second control signal receiving department

46. . . First hybrid circuit

46A. . . The first output terminal portion

46B. . . The second output terminal portion

46C. . . The third output terminal portion

47. . . Second hybrid circuit

47A. . . The first output terminal portion

47B. . . The second output terminal portion

47C. . . The third output terminal portion

48. . . First amplifier

49. . . Second amplifier

A. . . Household terminal

B. . . Trunk control terminal

C. . . Hall walkie talkie

C1, C2, C3, C4. . . capacitance

D. . . Bifurcation

D1. . . Main connection

D2. . . Main connection

D11. . . First connection terminal

D12. . . Second connection terminal

D21. . . First connection terminal

D22. . . Second connection terminal

D23. . . Bifurcation circuit

D3. . . Secondary connection

D31. . . First sub-connection terminal

D32. . . Second sub-connection terminal

E. . . Terminal

F‧‧‧System Adder

G‧‧‧Repinder

H‧‧Amplifier

L1‧‧‧Inductance

L2‧‧‧Inductance

LA‧‧‧Main line

LB‧‧‧Sub trunk

LC‧‧‧Community Main Line

LD‧‧‧Household line

LS‧‧‧ dedicated communication line

R1, R2, R3, R4, R5, R6‧‧‧ resistors

T‧‧‧Transformer

T2, T3, T4, T5, T6, T7, T8, T9‧‧‧ transformers

SW1‧‧‧Toggle switch

SW2‧‧‧Toggle switch

Fig. 1 shows Embodiment 1 of the present invention. 1A is a system configuration diagram, and FIG. 1B is a block diagram of a system adder.

Fig. 2 is a circuit diagram of a splitter according to the first embodiment of the present invention.

Fig. 3 is a block diagram showing another configuration of the system adder according to the first embodiment of the present invention.

Fig. 4 is a block diagram showing still another configuration of the system adder according to the first embodiment of the present invention.

Fig. 5 is a system configuration diagram of a second embodiment of the present invention.

Fig. 6 is a view showing another system configuration of a second embodiment of the present invention.

Fig. 7 is a block diagram showing an amplifier of a third embodiment of the present invention.

In Fig. 8, Fig. 8A and Fig. 8B are block diagrams showing an amplifier according to a fourth embodiment of the present invention.

Figure 9 is a block diagram of an amplifier according to a fifth embodiment of the present invention.

Figure 10 is a block diagram of another embodiment of a system adder.

1. . . Control department

2. . . Transmission processing unit

3. . . Call processing department

4. . . microphone

5. . . speaker

6. . . A/D converter

7. . . D/A converter

8. . . Image processing department

9. . . Display department

10. . . Operation input receiving unit

A. . . Household terminal

B. . . Trunk control terminal

C. . . Hall walkie talkie

D. . . Bifurcation

E. . . Terminal

F. . . System adder

LA. . . Main line

LB. . . Secondary trunk

LC. . . Common department trunk

LD. . . Household line

Claims (12)

A communication system is characterized in that a plurality of communication terminals communicate via a communication path, wherein the communication path includes: a secondary trunk of a plurality of systems, and one or a plurality of communication terminals are connected to each other; and a trunk line is connected. a plurality of system adders are connected to each other to connect the sub trunks of the plurality of systems; the plurality of system adders each include: a pair of main line connecting portions, which are inserted in series along the main line; the sub trunk connecting portion, a sub-trunk connected to the adder of the system; and a diverging circuit for diverging a signal flowing between the main line connecting portions of the pair to the sub trunk connecting portion; in the divergent circuit, the main side is The amount of attenuation when the communication signal input from the trunk connection portion is output from the other main line connection portion is smaller than the attenuation when the communication signal input from the pair of main line connection portions is output from the sub trunk connection portion. . A communication system according to claim 1, wherein the communication terminal includes a transmission processing unit configured to transmit a digitally modulated signal. The communication system of claim 2, wherein the transmission processing unit is configured to perform multi-carrier adaptability modulation. The communication system of any one of claims 1 to 3, wherein the plurality of system adder divergence circuits are equally divided into the total system by the sum of the divergence losses of all system adders connected in series to the main line. Formed by means of an adder. The communication system of any one of claims 1 to 3, wherein the system adder has: a plurality of divergent circuits having different divergence losses; and a switching unit configured to switchably connect the plurality of divergent circuits to the sub trunk connection. The communication system according to any one of claims 1 to 3, wherein the system adder has: a bypass for allowing a power supply current superimposed on the main line to pass through the branch line without passing through the branch circuit Circuit. The communication system according to any one of claims 1 to 3, wherein the terminal for the impedance integration is connected to the terminal of the aforementioned sub trunk. The communication system according to any one of claims 1 to 3, further comprising a repeater for relaying the communication signal. The communication system of claim 8, wherein the repeater includes: a connection terminal connected to the terminal of the sub trunk; a receiving unit receiving the communication signal via the connection terminal; and a communication unit via the connection The terminal transmits the communication signal; the receiving portion and the transmitting portion are connected in parallel with respect to the connection terminal. The communication system of claim 8, wherein the repeater comprises: a pair of connection terminals connected to the trunk line; and a pair of receiving portions each receiving a communication signal via the connection terminal; The transmitting unit transmits a communication signal via the connection terminal; and the modulation/demodulation unit is configured to perform modulation/demodulation processing on the communication signal; a pair of receiving portions and a pair of signaling The departments are connected in parallel with respect to the above-described modulation/demodulation unit. Such as the communication system of claim 8 of the patent scope, wherein the aforementioned system adder A housing that houses the trunk line connecting portion, the sub trunk connecting portion, and the branch circuit is provided, and the repeater is housed in the housing. The utility model relates to a walkie-talkie system for a residential house, characterized in that a plurality of communication terminals of claim 1 to 11 include: a shared terminal, which is disposed at a shared residence of a collective house; and a household terminal, which is installed at each household of the collective house; The trunk control terminal relays the communication signal between the terminal of the sharing unit and the household terminal; and transmits the voice of the call by at least the communication signal; and the communication channel of the communication system of claim 1 to 11 further And including a shared part trunk connecting the shared terminal and the trunk control terminal.