JP5623829B2 - CATV repeater, CATV transmission system and wired, wireless signal transmission method - Google Patents

Description

  The present invention relates to a CATV repeater, a CATV transmission system, and a wired and wireless signal transmission method.

  In Japan, CATV (Common Antenna TeleVision, Community Antenna TeleVision) transmission network has been developed as a communication network for wired communication, and it has become possible to receive television programs throughout the country without using an antenna. ing. In the first related technology related to the present invention, services such as communication by the Internet and optical telephone are also performed by using a coaxial cable or an optical fiber for the CATV transmission line network (see, for example, Patent Document 1).

  On the other hand, the frequency band for wireless communication is insufficient, and the present situation is that a sufficient frequency band cannot be allocated to a wireless terminal represented by a mobile phone. For this reason, the frequency band for television broadcasting that has been widely used in the VHF (Very High Frequency) band has been arranged. This is the measure to shift terrestrial television to digital television broadcasting.

  FIG. 7 shows a comparison between the allocation of radio waves by the conventional terrestrial television system and the allocation of radio waves after shifting to digital television broadcasting. The horizontal axis is a radio frequency, and the unit is MHz (megahertz).

  FIG. 4A shows the state before the transition. The VHF bands of 90-108 MHz and 170-222 MHz are occupied by television (TV) broadcast waves. 470-770 MHz is used for UHF (Ultra High Frequency) band television broadcasting.

  After the transition to the terrestrial digital system on July 25, 2011, the digital television broadcast is shifted to the UHF band of 470 to 770 MHz as shown in FIG. As a result, the frequency bands used for television in the VHF bands of 90-108 MHz and 170-222 MHz are emptied. These frequency bands are designed to be used for private communications.

JP 2003-032642 A (paragraph 0043, FIG. 1)

  Thus, it has been proposed to use a newly opened frequency band for wireless communication by utilizing a CATV transmission line network widely deployed nationwide. For this reason, in the second related technique of the present invention, it is proposed to newly arrange wireless transmitters at predetermined intervals along the CATV transmission line network. These deployed wireless transmitters can be used to enable wireless communication, for example, in the 90-108 MHz or 170-222 MHz VHF band.

However, if a desired number of wireless transmitters are arranged in the CATV transmission line network for this purpose, the following problems occur.
(1) The wireless transmitter to be arranged is a completely new device that is individually arranged at a predetermined interval on the transmission line, and it is necessary to develop a new product.
(2) Such a wireless transmitter not only has a housing structure that can withstand outdoor placement, but also requires various components such as a directional filter and a power supply circuit. For this reason, the circuit scale may be increased to some extent, and an insertion loss is newly generated as much as the wireless transmitter is inserted on the transmission path. As a result, the CATV operator needs to review the transmission line design anew, and a new component such as an auxiliary amplifier for compensating for the insertion loss is required.

  Therefore, an object of the present invention is to provide a CATV repeater, a CATV transmission system, and a wired and wireless signal transmission method that can be used in combination with wireless communication without reexamining the design of the CATV transmission line itself.

  In the present invention, (a) a first transmission line that is arranged inside a relay case and has the CATV provider side as a starting point or a return point, and the CATV provider side through the first transmission path. A first downstream line that extracts and transmits a signal transmitted from the first transmission line, and an upstream line that transmits a signal transmitted from each subscriber side to the first transmission path, and A first directional filter that sends a signal sent from one transmission line to the first downlink and sends a signal sent from the uplink to the first transmission line; B) One end of a second transmission line that is arranged inside the above-mentioned relay housing and has each subscriber side as a starting point or a return point, and each subscriber side through this second transmission line The above-described upstream line as a line for extracting and transmitting the transmitted signal The other end and one end of the second down line that sends the signal sent from the CATV provider side to the second transmission path are accommodated, and the signal sent from the second transmission path is described above. A second directional filter for sending the signal sent from the second downstream line to the second transmission line, and (c) arranged inside the above-mentioned relay housing. A branch that branches the downstream signal that has passed through the first downstream line into two, and that connects one end to the other end of the second downstream line that has one end accommodated in the second directional filter. And (d) the other of the downstream signals branched by this branching unit, which is placed inside the above-mentioned relay housing, and distributed by the above-mentioned CATV provider side to each of the above-mentioned subscribers by cable. Extract signals in a specific frequency band other than the frequency band. A CATV repeater, and (e) a CATV repeater which is arranged inside the above-mentioned relay housing and which converts a signal extracted by the bandpass filter into a signal to be output wirelessly Comprise.

  Further, in the present invention, (a) a first transmission line that is arranged inside a relay case and has a CATV provider side as a starting point or a return point, and the CATV described above via this first transmission line. Accommodates one end of each of the first downlink for extracting and transmitting the signal sent from the provider side and the uplink for sending the signal sent from each subscriber side to the first transmission line. The first directional filter that sends the signal sent from the first transmission line to the first downlink and sends the signal sent from the uplink to the first transmission line. And one end of a second transmission line that is arranged inside the above-described relay housing and has each subscriber side as a starting point or a return point, and from each subscriber side through this second transmission line As described above as a line for extracting and transmitting the transmitted signal The other end of the transmission line and one end of the second downstream line that sends out the signal sent from the CATV provider side to the second transmission line are accommodated, and the signal sent from the second transmission line And a second directional filter for sending the signal sent from the second downlink line to the second transmission line and the inside of the relay casing. A branch that branches the downstream signal that has passed through the first downstream line into two, and that connects one end to the other end of the second downstream line that has one end accommodated in the second directional filter. Other than the frequency band that is placed inside the relay case and the other of the downlink signals branched by this branching unit and is distributed to each subscriber side by the cable by the CATV provider side Extract a signal in a specific frequency band A plurality of CATV relays each provided with a bandpass filter and a wireless transmitter that is arranged inside the above-described relay housing and that converts a signal extracted by the bandpass filter into a signal that is output wirelessly And (b) connecting means for connecting adjacent ones of the plurality of CATV repeaters in series by connecting the first transmission line and the second transmission line with an interval therebetween. CATV transmission system.

  Furthermore, in the present invention, (a) each of the above-mentioned CATV repeaters in a CATV transmission system in which a CATV repeater having a built-in wireless transmitter is arranged at an interval in a transmission line connecting the CATV provider and each subscriber. A wired distribution step of distributing a signal of a specific frequency band to each subscriber's house using a cable; and (b) a specific signal comprising a frequency band other than the specific frequency band to be distributed to each of the subscriber houses described above. A specific signal separation step separated in the above-mentioned CATV repeater, and (c) a specific signal separated in this specific signal separation step is converted into a radio signal in the above-mentioned CATV repeater and transmitted to the subscriber's wireless terminal. The wireless transmission step includes a wired and wireless signal transmission method.

  As described above, according to the present invention, by incorporating a wireless transmitter in a CATV repeater, not only wired broadcasting of television broadcasting using a transmission line such as an original coaxial cable but also wireless communication with a wireless terminal is possible. Communication is possible. Thereby, for example, a service can be provided ubiquitously to a CATV subscriber. In addition, by incorporating the wireless transmitter in the CATV repeater, the circuit scale can be reduced compared to the case where the wireless transmitter is newly developed and individually deployed outside the CATV repeater, and the existing CATV transmission. There is no need to review the road design. In addition, when the CATV repeater is built in the wireless transmitter, the CATV operator only needs to replace the existing CATV repeater on the transmission line, and there is no need to change the level diagram of the transmission line, and it is necessary to review the transmission line design. Disappears.

It is a claim corresponding figure of the CATV repeater of this invention. It is a claim corresponding figure of the CATV transmission system of the present invention. It is a claim corresponding | compatible figure of the wired and wireless signal transmission method of this invention. It is a block diagram showing the structure of the CATV repeater by embodiment of this invention. It is a block diagram showing the structure of the CATV repeater in the modification of this invention. It is the block diagram which represented the structure of the conventional CATV repeater with reference. It is explanatory drawing which contrasted the allocation of the electromagnetic wave by the conventional terrestrial television system, and the allocation of the electromagnetic wave after transfer to digital television broadcasting.

  FIG. 1 is a diagram corresponding to claims of the CATV repeater according to the present invention. The CATV repeater 10 of the present invention includes a first directional filter 11, a second directional filter 12, a branching device 13, a bandpass filter 14, and a wireless transmitter 15. . Here, the first directional filter 11 is disposed inside the relay casing, and has a first transmission line with the CATV provider side as a starting point or a return point, and the first transmission line. A first downlink for extracting and transmitting a signal sent from the CATV provider side, and an uplink for sending the signal sent from each subscriber side to the first transmission line. Is housed at one end. The first directional filter 11 sends out the signal sent from the first transmission line to the first down line and the signal sent from the up line as described above. 1 is sent to the transmission line. The second directional filter 12 is disposed inside the above-described relay housing, and has one end of a second transmission line that starts from each subscriber side or a return point, and the second transmission line. The other end of the upstream line as a line for extracting and transmitting the signal sent from each of the subscribers via the above and the signal sent from the CATV provider side as described above One end of each second down line sent out to the transmission line is accommodated. The second directional filter 12 sends out the signal sent from the second transmission line to the above-described upstream line, and sends the signal sent from the above-described second downstream line to the above-described second line. To the transmission line. The branching device 13 is arranged inside the above-described relay housing, branches the downstream signal that has passed through the above-described first downstream line into two, one of which is connected to the second directional filter 12 described above. Is connected to the other end of the second downstream line. The band-pass filter 14 is arranged inside the above-described relay housing, inputs the other of the downlink signals branched by the branching unit 13, and distributes the above-mentioned CATV provider side to each of the above-described subscribers via a cable. A signal in a specific frequency band other than the frequency band is extracted. The wireless transmitter 15 is disposed inside the above-described relay housing, and receives the signal extracted by the bandpass filter 14 and converts it into a signal to be output wirelessly.

  FIG. 2 shows a claim correspondence diagram of the CATV transmission system of the present invention. The CATV transmission system 20 of the present invention includes a plurality of CATV repeaters 21 and connecting means 22. Here, each of the plurality of CATV repeaters 21 includes a first directional filter 21a, a second directional filter 21b, a branching device 21c, a band, It consists of a pass filter 21d and a wireless transmitter 21e. The first directional filter 21a includes a first transmission line having a CATV provider side as a starting point or a return point, and a signal transmitted from the CATV provider side through the first transmission path. The first downstream line for extracting and transmitting the signal and the one end of the upstream line for sending the signal sent from each subscriber side to the first transmission line described above are accommodated. The first directional filter 21a sends out the signal sent from the first transmission path to the first down line as described above and the signal sent from the up line as described above. To the transmission line. The second directional filter 21b is sent from one end of the second transmission line that has each subscriber side as a starting point or a return point, and from each subscriber side through the second transmission line. And the other end of the upstream line as a line for extracting and transmitting the transmitted signal, and one end of the second downstream line for sending the signal sent from the CATV provider side to the second transmission line. Each one is housed. The second directional filter 21b sends out the signal sent from the second transmission line to the above-described upstream line, and sends the signal sent from the above-described second downstream line to the above-mentioned second line. To the transmission line. The branching device 21c is disposed inside the above-described relay housing, branches the downstream signal that has passed through the first downstream line into two, and one of the two is connected to the second directional filter 21b described above. Is connected to the other end of the second downstream line. The band-pass filter 21d is arranged inside the above-described relay housing, inputs the other of the downlink signals branched by the branching unit 21c, and distributes the above-mentioned CATV provider side to each of the above-described subscribers via a cable. A signal in a specific frequency band other than the frequency band is extracted. The wireless transmitter 21e receives the signal extracted by the bandpass filter 21d and converts it into a signal to be output wirelessly. The connecting means 22 connects adjacent ones of the plurality of CATV repeaters 21 in series by connecting the first transmission path and the second transmission path as described above.

  FIG. 3 shows a claim correspondence diagram of the wired and wireless signal transmission method of the present invention. The wired / wireless signal transmission method 30 of the present invention includes a wired distribution step 31, a specific signal separation step 32, and a wireless transmission step 33. Here, in the cable distribution step 31, each of the above-mentioned CATV repeaters in the CATV transmission system in which the CATV repeater having a built-in wireless transmitter is arranged at an interval in the transmission path connecting the CATV provider and each subscriber. A signal of a specific frequency band is distributed to each subscriber's house using a cable. In the specific signal separation step 32, a specific signal having a frequency band other than the specific frequency band distributed to each subscriber house is separated in the CATV repeater. In the wireless transmission step 33, the specific signal separated in the specific signal separation step 32 is converted into a wireless signal in the CATV repeater and transmitted to the subscriber's wireless terminal.

  <Embodiment of the Invention>

  Next, an embodiment of the present invention will be described.

FIG. 4 shows a configuration of the CATV repeater according to the embodiment of the present invention. The CATV repeater 100 according to the present embodiment is one unit that is arranged one by one at an interval of about 400 meters in the middle of a transmission line 101 such as an optical fiber constituting the CATV transmission line network. A first directional filter (DF) 102 connected to the preceding transmission line 101 _X is arranged on one end side of the CATV repeater 100, and the next transmission line 101 _{X +} is connected to the other end side. _A second directional filter 103 connected to ₁ is arranged.

The first directional filter 102 sends a downstream signal 104 input from the transmission line 101 _X from the CATV operator to the subscriber to the first amplification element 105 side, and from the second amplification element 106. It has the role of sending the input upstream signal 107 from each subscriber to the transmission line 101 _X. The second directional filter 103 sends the upstream signal 108 from each subscriber input from the transmission line 101 _{X + 1} to the second amplification element 106. Also, the second directional filter 103 has a role of inputting one downlink signal 111 output from the first amplifying element 105 and branched by the branching unit 109 and sending it to the transmission line 101 _{X + 1.} have.

  The other downlink signal 112 branched by the branching unit 109 is input to the band pass filter 114, and the private communication signal 115 is extracted. The private communication signal 115 is a high-frequency electric signal (RF (Radio Frequency) signal) to be sent to a wireless terminal (not shown) located around the CATV repeater 100. The private communication signal 115 having a specific frequency extracted from the band pass filter 114 is input to the first impedance converter 116.

  The first impedance converter 116 converts the signal impedance of the private communication signal 115 from 75 ohms to a signal impedance 50 ohms suitable for wireless transmission. The converted private communication signal 117 is input to the wireless transmitter 118 built in the CATV repeater 100, and is output as the private communication signal 119 for sending to the wireless terminal. This private communication signal 119 is input to the second impedance converter 121 and converts the signal impedance of 50 ohms into a signal impedance of 75 ohms suitable for the transmitting antenna 122. The converted private communication signal 123 is transmitted from the transmitting antenna 122 into the air.

  The CATV repeaters 100 of the present embodiment are scattered relatively densely in areas where television can be viewed on the CATV transmission line network. For this reason, the CATV operator uses a specific frequency band necessary for private communication in the VHF band of 90-108 MHz or 170-222 MHz shown in FIG. Wireless communication with each subscriber's wireless terminal can be performed in a low weak radio wave state.

  Of course, the CATV operator uses the same modulation / demodulation method for information transmitted wirelessly from the wireless transmitter 118 of the CATV repeater 100 and the modulation / demodulation method for wired broadcasting at the time of wired communication, so that the information received by the wireless terminal can be used for wired broadcasting. It can also be received at the terminal.

  As described above, according to the present embodiment, it is not necessary for a CATV operator to individually provide a wireless transmitter on the CATV transmission path, and by using the wireless transmitter 118 built in the CATV repeater 100 itself, Wireless communication can be received by a wireless terminal within an area where CATV is received. Thus, since the CATV repeater 100 itself has a function as a wireless transmitter, the circuit scale can be reduced as compared with the case where the wireless transmitter is individually installed on the transmission path. Further, since the design is performed in consideration of the gain as a wireless transmitter, there is an advantage that the level diagram of the transmission line does not change and the CATV transmission line design need not be reviewed.

  Further, as already described, the interval at which the CATV repeater 100 is installed is as short as about 400 meters, for example. For this reason, the wireless transmitter 118 built in the CATV repeater 100 has an advantage that transmission can be performed using weak radio waves. Further, since the CATV repeater 100 incorporates the wireless transmitter 118, an independent power source is not required for the wireless transmitter 118 as compared with the case where the wireless transmitter is individually provided in the transmission path, and the entire CATV transmission path Power consumption can be reduced.

  Furthermore, according to the present embodiment, by making the modulation / demodulation method of the cable broadcasting the same as the modulation / demodulation method of the wireless transmitter, the subscriber can receive the same content as the content received by the terminal for cable broadcasting in the home or office. Can be received wirelessly by a portable terminal or a wireless receiver at an arbitrary location such as outdoors.

<Deformability of invention>
FIG. 5 shows a configuration of a CATV repeater in a modification of the present invention. In FIG. 5, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The CATV repeater 100A of this modified example is appropriately arranged in the middle of the transmission line 101 such as an optical fiber constituting the CATV transmission line network as necessary. A first directional filter 102 connected to the preceding transmission line 101 _Y is arranged on one end side of the CATV repeater 100A, and connected to the next transmission line 101 _{Y + 1} on the other end side. The second directional filter 103 is disposed.

The first directional filter 102 directly inputs the downlink signal 104 from the CATV operator to the subscriber input from the transmission line 101 _Y to the branching unit 109. The first directional wave filter 102 has a role of transmitting the uplink signal 108A from the second directional wave filter 103 Kararo waves have been each subscriber in the transmission path 101 _Y. The second directional filter 103 also has a role of inputting one downlink signal 111A after being branched by the branching device 109 and sending it to the transmission line 101 _{Y + 1} .

  The other downlink signal 112A branched by the branching unit 109 is input to the band pass filter 114, and the private communication signal 115A is extracted. The private communication signal 115A is a signal for sending to a wireless terminal (not shown) located around the CATV repeater 100A. The private communication signal 115 </ b> A having a specific frequency extracted from the band pass filter 114 is input to the first impedance converter 116.

  The first impedance converter 116 converts the signal impedance of the private communication signal 115A from 75 ohms to a signal impedance 50 ohms suitable for wireless transmission. The converted private communication signal 117A is input to the wireless transmitter 118 built in the CATV repeater 100, and is output as a private communication signal 119A to be sent to the wireless terminal. This private communication signal 119A is input to the second impedance converter 121, and converts the signal impedance of 50 ohms into a signal impedance of 75 ohms suitable for the transmitting antenna 122. The converted private communication signal 123A is transmitted from the transmitting antenna 122 into the air.

As described above, the CATV repeater 100A according to the modified example does not include the first amplifying element 105 and the second amplifying element 106 as compared with the CATV repeater 100 according to the embodiment shown in FIG. This is a modification of the CATV repeater 100 shown in FIG. 4 in which the first amplifying element 105 and the second amplifying element 106 are built in the vicinity of the transmission lines 101 _Y and 101 _{Y + 1} . This is because even in the CATV repeater 100A, the wireless transmitter 118 can be used without any particular problem of signal loss. Of course, a CATV repeater having a built-in amplifying element used in the CATV transmission line may be present in the vicinity of the modified CATV repeater 100A.

  FIG. 6 shows the configuration of such a conventional CATV repeater as a reference. In FIG. 6, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

In the conventional CATV repeater 100C, the output side of the first amplifying element 105 is directly connected to the second directional filter 103. Therefore, the downstream signal 111C output from the first amplifying element 105 is filtered by the second directional filter 103 and sent to the transmission line 101 _{X + 1 at the} next stage. Processing of the upstream signal 108 from each subscriber filtered by the second directional filter 103 is the same as the CATV repeater 100 of the embodiment.

  According to the CATV repeater 100A of the modified example of the present invention, even if an existing CATV repeater does not exist at a location most suitable for wireless transmission in the transmission line 101 constituting the CATV transmission line network, the wireless transmission is performed. A CATV repeater with a built-in device 118 can be arranged. Moreover, the CATV repeater 100A is less expensive and can reduce power consumption than the CATV repeater 100 of the embodiment.

  The present invention can be applied to various modifications in addition to these embodiments and modifications. For example, the downlink signal demultiplexed by the first directional filter 102 and the second directional filter 103 is 70-770 MHz, and the uplink signal is 10 MHz-55 MHz. Therefore, by changing the pass bands of the first directional filter 102 and the second directional filter 103, the downstream signal band and the upstream signal band can be freely changed.

  In addition, with regard to the frequency used for the private communication, by changing the pass band of the band pass filter 114, for example, a wireless terminal typified by a mobile phone within a permitted frequency such as 90-108 MHz or 170-222 MHz. Thus, a desired frequency can be freely assigned and used.

  Furthermore, it can be used for radio by changing the pass band of the first directional filter 102 and the second directional filter 103 mounted on the CATV repeater itself and the pass band of the band pass filter 114. It is possible to flexibly cope with various frequency bands.

  Moreover, although the example demonstrated above demonstrated the example which incorporates a radio transmitter in a CATV repeater, it is not restricted to this. For example, while a CATV repeater has a built-in wireless transmitter, in some areas, a wireless communication signal separated from the CATV repeater is sent to an external wireless transmitter for wireless communication. Also good. This makes it possible to acquire a contractor other than the contractor who is currently viewing CATV and realize a new wireless service.

  Some or all of the embodiments described above are described as in the following supplementary notes, but are not limited to the following descriptions.

(Appendix 1)
A first transmission line which is arranged inside the relay case and has the CATV provider side as a starting point or a return point, and a signal transmitted from the CATV provider side through the first transmission path are extracted. The first downlink to be transmitted and the one end of the uplink to send the signal sent from each subscriber side to the first transmission line are accommodated and sent from the first transmission line. A first directional filter for sending a signal to the first downlink and sending a signal sent from the uplink to the first transmission line;
One end of a second transmission line that is arranged inside the relay case and has each subscriber side as a starting point or a return point, and is sent from each subscriber side via this second transmission line Receiving the other end of the upstream line as a line for extracting and transmitting a signal, and one end of a second downstream line for sending a signal sent from the CATV provider side to the second transmission line; A second directional filter for sending a signal sent from the second transmission line to the upstream line and sending a signal sent from the second downstream line to the second transmission line;
The second downstream line, which is arranged inside the relay casing, branches the downstream signal passing through the first downstream line into two, and one of the ends is accommodated in the second directional filter A branching device connected to the other end of
A specific frequency band other than the frequency band that is arranged inside the relay case and that inputs the other of the downlink signals branched by this branching unit and that is distributed to each subscriber side by the cable from the CATV operator side. A bandpass filter for extracting the signal;
A wireless transmitter that is arranged inside the relay case and that converts the signal extracted by the bandpass filter into a signal that is output wirelessly;
A CATV repeater characterized by comprising:

(Appendix 2)
The CATV repeater according to appendix 1, wherein amplification means for amplifying a signal to be transmitted is interposed in each of the first downlink line and the uplink line.

(Appendix 3)
The CATV repeater according to appendix 1, wherein the first downlink line and the uplink line are configured only by a line not having an amplification function.

(Appendix 4)
The CATV repeater according to appendix 1, wherein the signal in the specific frequency band is a signal in the 90-108 MHz and 170-222 MHz frequency bands.

(Appendix 5)
Between the band pass filter and the wireless transmitter, a first impedance converter that converts signal impedances in the 90-108 MHz and 170-222 MHz frequency bands into a signal impedance suitable for wireless transmission is disposed. The CATV repeater according to appendix 4, which is characterized.

(Appendix 6)
Between the radio transmitter and a transmission antenna provided for transmitting radio, there is a second impedance converter for converting the signal impedance output from the radio transmitter into a signal impedance suitable for the transmission antenna. The CATV repeater according to appendix 1, wherein the CATV repeater is arranged.

(Appendix 7)
A first transmission line that is arranged inside the relay case and has a CATV provider side as a starting point or a return point, and a signal sent from the CATV provider side through the first transmission path A first downstream line to be extracted and transmitted, and an end of each upstream line that sends a signal sent from each subscriber side to the first transmission line are accommodated and sent from the first transmission line. The first directional filter for sending the signal sent from the uplink to the first transmission line and the first directional filter for sending the signal sent from the uplink to the first transmission line, and the relay housing, One end of a second transmission line having each subscriber side as a starting point or a return point, and a line for extracting and transmitting a signal transmitted from each subscriber side through the second transmission line The signal sent from the other end of the upstream line and the CATV operator side Each one end of the second downstream line that sends out the signal to the second transmission line, and the signal sent from the second transmission line is sent to the upstream line and sent from the second downstream line A second directional filter for sending a signal to a second transmission line, and a relay signal disposed inside the relay housing, branching a downstream signal passing through the first downstream line into two, A branching device connected to the other end of the second downstream line, one end of which is housed in a second directional filter, and a downstream signal that is arranged inside the relay housing and branched by the branching device. The other is input, and the CATV provider side is arranged in a band pass filter for extracting a signal in a specific frequency band other than the frequency band distributed to each subscriber side by a cable, inside the relay casing, and this Extracted by bandpass filter A plurality of CATV repeaters each provided a radio transmitter for converting the signal output by radio to input signals,
A connecting means for connecting adjacent ones of the plurality of CATV repeaters in series by connecting the first transmission path and the second transmission path at intervals. CATV transmission system.

(Appendix 8)
In the vicinity of the CATV repeater in which the amplification means for amplifying the signal transmitted through the first downlink and the uplink is incorporated, the first downlink and the uplink do not have an amplification function. The CATV transmission system according to appendix 7, wherein a configured CATV repeater is arranged.

(Appendix 9)
A wireless transmission cable drawn out from any one of the plurality of CATV repeaters, and a wireless transmitter disposed outside the relay housing and connected to the wireless transmission cable. The CATV transmission system according to appendix 7.

(Appendix 10)
A cable is used to connect each CATV repeater to each subscriber's house in the CATV transmission system in the CATV transmission system in which a CATV repeater with a built-in wireless transmitter is arranged at an interval in a transmission line connecting the CATV provider and each subscriber. Wired distribution step for distributing a signal of a specific frequency band to the
A specific signal separating step of separating a specific signal composed of a frequency band other than the specific frequency band distributed to each subscriber house in the CATV repeater;
A wired and wireless signal transmission method comprising: a wireless transmission step of converting the specific signal separated in the specific signal separation step into a wireless signal in the CATV repeater and transmitting the wireless signal to a subscriber's wireless terminal.

10, 100, 100A, 100C CATV repeater 11, 21a, 102 First directional filter 12, 21b, 103 Second directional filter 13, 21c, 109 Branch 14, 14, 21d, 114 Band pass Filters 15, 21e, 118 Wireless transmitter 20 CATV transmission system 21 Multiple CATV repeaters 22 Connection means 30 Wired and wireless signal transmission method 31 Wired distribution step 32 Specific signal separation step 33 Wireless transmission step 101 Transmission path 105 First amplification Element 106 Second amplifying element 116 First impedance converter 121 Second impedance converter 122 Transmitting antenna

Claims (10)

A first transmission line which is arranged inside the relay case and has the CATV provider side as a starting point or a return point, and a signal transmitted from the CATV provider side through the first transmission path are extracted. The first downlink to be transmitted and the one end of the uplink to send the signal sent from each subscriber side to the first transmission line are accommodated and sent from the first transmission line. A first directional filter for sending a signal to the first downlink and sending a signal sent from the uplink to the first transmission line;
One end of a second transmission line that is arranged inside the relay case and has each subscriber side as a starting point or a return point, and is sent from each subscriber side via this second transmission line Receiving the other end of the upstream line as a line for extracting and transmitting a signal, and one end of a second downstream line for sending a signal sent from the CATV provider side to the second transmission line; A second directional filter for sending a signal sent from the second transmission line to the upstream line and sending a signal sent from the second downstream line to the second transmission line;
The second downstream line, which is arranged inside the relay casing, branches the downstream signal passing through the first downstream line into two, and one of the ends is accommodated in the second directional filter A branching device connected to the other end of
A specific frequency band other than the frequency band that is arranged inside the relay case and that inputs the other of the downlink signals branched by this branching unit and that is distributed to each subscriber side by the cable from the CATV operator side. A bandpass filter for extracting the signal;
A wireless transmitter that is arranged inside the relay case and that converts the signal extracted by the bandpass filter into a signal that is output wirelessly;
The CATV repeater characterized by comprising.     2. The CATV repeater according to claim 1, wherein amplification means for amplifying a signal to be transmitted is interposed in each of the first downlink line and the uplink line.     2. The CATV repeater according to claim 1, wherein the first downlink line and the uplink line are configured only by lines that do not have an amplification function.     2. The CATV repeater according to claim 1, wherein the signal in the specific frequency band is a signal in a frequency band of 90-108 MHz and 170-222 MHz. The radio frequency band of the signal output by the wireless transmitter, CATV relay according to claim 1, wherein different from the frequency band of the other radio signal to reach to the each subscriber.     Between the radio transmitter and a transmission antenna provided for transmitting radio, there is a second impedance converter for converting the signal impedance output from the radio transmitter into a signal impedance suitable for the transmission antenna. The CATV repeater according to claim 1, wherein the CATV repeater is arranged. A first transmission line that is arranged inside the relay case and has a CATV provider side as a starting point or a return point, and a signal sent from the CATV provider side through the first transmission path A first downstream line to be extracted and transmitted, and an end of each upstream line that sends a signal sent from each subscriber side to the first transmission line are accommodated and sent from the first transmission line. The first directional filter for sending the signal sent from the uplink to the first transmission line and the first directional filter for sending the signal sent from the uplink to the first transmission line, and the relay housing, One end of a second transmission line having each subscriber side as a starting point or a return point, and a line for extracting and transmitting a signal transmitted from each subscriber side through the second transmission line The signal sent from the other end of the upstream line and the CATV operator side Each one end of the second downstream line that sends out the signal to the second transmission line, and the signal sent from the second transmission line is sent to the upstream line and sent from the second downstream line A second directional filter for sending a signal to a second transmission line, and a relay signal disposed inside the relay housing, branching a downstream signal passing through the first downstream line into two, A branching device connected to the other end of the second downstream line, one end of which is housed in a second directional filter, and a downstream signal that is arranged inside the relay housing and branched by the branching device. The other is input, and the CATV provider side is arranged in a band pass filter for extracting a signal in a specific frequency band other than the frequency band distributed to each subscriber side by a cable, inside the relay casing, and this Extracted by bandpass filter A plurality of CATV repeaters each provided a radio transmitter for converting the signal output by radio to input signals,
A connecting means for connecting adjacent ones of the plurality of CATV repeaters in series by connecting the first transmission path and the second transmission path at intervals. CATV transmission system.     In the vicinity of the CATV repeater in which the amplification means for amplifying the signal transmitted through the first downlink and the uplink is incorporated, the first downlink and the uplink do not have an amplification function. 8. The CATV transmission system according to claim 7, wherein a configured CATV repeater is arranged.     A wireless transmission cable drawn out from any one of the plurality of CATV repeaters, and a wireless transmitter disposed outside the relay housing and connected to the wireless transmission cable. The CATV transmission system according to claim 7. A cable is used to connect each CATV repeater to each subscriber's house in the CATV transmission system in the CATV transmission system in which a CATV repeater with a built-in wireless transmitter is arranged at an interval in a transmission line connecting the CATV provider and each subscriber. Wired distribution step for distributing a signal of a specific frequency band to the
A specific signal separating step of separating a specific signal composed of a frequency band other than the specific frequency band distributed to each subscriber house in the CATV repeater;
A wired and wireless signal transmission method comprising: a wireless transmission step of converting the specific signal separated in the specific signal separation step into a wireless signal in the CATV repeater and transmitting the wireless signal to a subscriber's wireless terminal.

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