JP2002044482A - Composite wiring system - Google Patents

Abstract

(57) [Problem] To provide a low-cost composite wiring system by minimizing new equipment without using photoelectric devices such as a photoelectric mixing cable and a photoelectric mixing TV device. SOLUTION: At least one antenna 2 for receiving a TV signal, a channel selector 6 for down-converting a high-frequency TV signal from the antenna to near a baseband, and power lines 1 and 4 for transmitting low-frequency power. When,
The TV signal inserted into the power line and connected to the channel selector 6 and received by the antenna 2 is transmitted to the power lines 1 and 4.
A multiplexing circuit 7 that transmits the low-frequency power in one direction above,
Is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting a low-frequency power line used in ordinary households and a high-frequency wiring of a television (TV) to one.
The present invention relates to a composite wiring system that collectively flows on a single track.

[0002]

2. Description of the Related Art Since a power cable is necessary for all devices, if a signal can be passed through the power cable, it is not necessary to separately provide cables such as a power supply line and a signal line. There is an echo net as a method of flowing a signal line through the power cable. This echo net is mainly used for power control of white goods, and enables power control from a remote place by connecting to an external network. However, this method is limited to only the low frequency band and cannot perform broadband transmission.

[0003] Terrestrial TV includes VHF and UHF bands. These antennas generally use Yagi antennas, and different antennas are often used in the VHF band and the UHF band. VHF band is 90MHz ~
220 MHz, UHF band is 470 MHz to 770
MHz is the band used. In addition, satellite broadcasting BS reception is 12
GHz band, but in BS antenna receiver IF band
(About 1 GHz). These are connected to TV equipment via dedicated antenna cables.

A conventional device of this type using both an antenna cable and a power cable is disclosed in, for example, Japanese Patent Laid-Open No. 9-224.
No. 241, and FIG. 3 is a schematic configuration diagram thereof. 31 is a UHF antenna, 32 is a VHF antenna, 33 is a BS antenna, 34 is an AC power supply, 35 is an optical BS / UHF / VHF mixer, 36 is a photoelectric mixing cable, 37 is a photoelectric mixing outlet, and 38 is a photoelectric mixing cable with a plug. , 39 are photoelectric mixing TV devices.

[0005] UHF antenna 31, VHF antenna 3
2. The high-frequency power received by the BS antenna 33 is the optical BS
The signal is synthesized by the UHF / VHF mixer 35 and further converted into an optical signal. The optical signal is transmitted by the photoelectric mixing cable 36. The AC power supply 34 is connected to the photoelectric mixing cable 36, and the power supplied by the AC power supply 34 is transmitted inside the photoelectric mixing cable 36 together with the optical signal. The photoelectric mixing cable 36 is connected to a photoelectric mixing TV device 39 via a photoelectric mixing outlet 37 by a photoelectric mixing cable 38 with a plug.

The photoelectric mixing TV device 39 converts an optical signal into an electric signal, and then splits the signal into a VHF signal, a UHF signal, and a BS signal, and serves as a TV image and audio signal source. Further, the photoelectric mixing TV device 39 operates with the AC power supplied by the photoelectric mixing cable 38.

[0007]

In the above-described conventional apparatus of this type, it is necessary to newly lay a photoelectric mixing cable, which is much different from a conventional apparatus in which an antenna cable is laid. There is no problem. Further, in the conventional apparatus, since a large number of equipment not used in the conventional home such as a photoelectric mixing TV apparatus and a photoelectric mixing cable corresponding to the photoelectric mixing cable are used, a large investment is required for installation. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been achieved by minimizing new equipment without using photoelectric devices such as a photoelectric mixing cable and a photoelectric mixing TV device. The purpose is to provide a complex wiring system at a low price.

[0009]

SUMMARY OF THE INVENTION In view of the above, the present invention provides at least one antenna for receiving a TV signal, and a channel selector for down-converting a high-frequency TV signal from the antenna to near a baseband. A power line for transmitting low-frequency power, and a multiplexing device that is inserted into the power line and connected to the channel selector and transmits a TV signal received by the antenna together with the low-frequency power in one direction on the power line. And a circuit.

The power line comprises a main power line connected to the input side of the multiplexing circuit and a branch power line for branching the output of the multiplexing circuit, and an outlet terminal provided at the tip of the branch power line; 2. The composite wiring system according to claim 1, further comprising an up-converter connected to the terminal to separate the low-frequency power and the TV signal, and a TV device connected to the up-converter.

The composite wiring system according to claim 1, wherein the multiplexing circuit includes an amplifier for amplifying a high-frequency signal.

[0012] Further, the radio communication apparatus further includes a subscriber system radio access antenna and a channel selector for down-converting a radio communication signal from the radio access antenna to a vicinity of a baseband and inputting the converted signal to the multiplexing circuit. The composite wiring system according to claim 1, wherein the wireless communication signal is also multiplexed.

[0013] The radio communication apparatus further includes a subscriber-system radio access antenna and a channel selector for down-converting a radio communication signal from the radio access antenna to a vicinity of a baseband and inputting the converted signal to the multiplexing circuit. The composite wiring system according to claim 2, wherein the wireless communication signals are also multiplexed, and the TV device further includes a converter for the wireless communication.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a configuration of a composite wiring system according to an embodiment of the present invention. Reference numeral 1 denotes a main power line among power lines transmitting low frequency power (commercial power frequency) for transmitting power indoors. Power line. Reference numeral 2 denotes an antenna, 3 denotes a feed line, 4 denotes a branch power line among power lines, 5 denotes an outlet terminal provided on a wall surface in a room, 6 denotes a channel selector, and 7 denotes a multiplexing circuit. 9 is an up-converter and 8 is its power cable. Reference numeral 11 denotes a TV device, and reference numeral 10 denotes a power cable thereof. Reference numeral 20 denotes a TV antenna cable for transmitting the TV signal separated by the up-converter 9.

Next, the operation will be described. VHF band for terrestrial TV is 90MHz to 220MHz, UHF band is 4MHz
70MHz to 770MHz, BS / CS is 1G in IF band
Hz, which are in the high frequency band, so that this signal cannot be transmitted to the power line. At present, there is a limit up to 450 KHz by the Radio Law, and even if it is expanded to several tens of MHz in the future, it cannot be transmitted as it is.

Therefore, the main power line 1 and the branch power line 4
In order to transmit a TV signal to a power line composed of a channel selector, a channel selector 6 for down-converting the TV signal to a baseband is provided. Baseband is 4MHZ for terrestrial TV
Since the frequency is about z and BS is about 6 MHz, it can flow through the power line. If there are many channels, 4 × 6 = 24 MHz is required if there are 6 terrestrial channels, and 3
For a channel, 6 × 3 = 18 MHz is required.
In the case of transmitting both, a further wideband characteristic is required. Therefore, a desired channel is selected by the channel selector 6.

In FIG. 1, the antenna 2 is connected to the VHF band and the UH band.
It is shown for terrestrial waves in the F band and for BS / CS, and the channel selector 6 can select only a terrestrial channel or only a BS channel. The multiplexing circuit 7 multiplexes the down-converted high-frequency signal with the low-frequency power. The multiplexing circuit 7 transmits a signal with respect to the high frequency only to the branch power line 4 side, and does not transmit a low-frequency power to the feed line 3 side.

The multiplexed signal is branched by the branch power line 4. The outlet terminal 5 is connected to the end of the branch power line 4. This outlet terminal 5 is provided, for example, in each room.

Next, when the TV device 11 is used, the up converter 9 is connected to the outlet terminal 5 to separate the low frequency power of the power source from the high frequency TV signal. The low-frequency power is supplied to the power cable 10 of the TV device 11, and the high-frequency TV signal is connected to an antenna input terminal (not particularly shown) of the TV device 11 via the TV antenna cable 20. . The up-converter 9 converts a baseband TV signal into a VHF band, a UHF band, or a BS / CS.
To the IF band frequency.

In the case of the above configuration, the TV device 11
It is no longer necessary to newly provide high-frequency wiring in the house to operate the TV, so that there is an advantage that the TV device 11 can be freely arranged at the place where the outlet terminal 5 is arranged. Further, the equipment to be added is a channel selector 6, a multiplexing circuit 7, an outlet terminal 5, and an up-converter 9, which can be realized at a low price without having to provide many devices for photoelectric mixing as in the related art. .

The high-frequency signal is reflected by a connection point between the main power line 1 and the branch power line 4 constituting the power line, the outlet terminal 5 and the like. However, since the main power line 1 and the branch power line 4 are not usually designed for high frequencies, they have a large attenuation constant for high frequencies. Therefore, since the reflected wave as described above is attenuated, a problem due to multiple reflections on the main power line 1 and the branch power line 4 does not occur.

Since the main power line 1 and the branch power line 4 have a large attenuation constant with respect to high frequency, the high frequency signal received by the antenna 2 is greatly attenuated before reaching the outlet terminal 5. Therefore, the problem can be solved by, for example, inserting an amplifier 7a for amplifying the high-frequency signal inside the multiplexing circuit 7 and amplifying the high-frequency signal to a level that can withstand large attenuation. Although the multiplexing circuit 7 is installed outside the channel selector 6 in FIG. 1, it may be installed inside the channel selector 6.

Embodiment 2 FIG. FIG. 2 shows a configuration of a composite wiring system according to another embodiment of the present invention, in which not only a signal for TV but also a signal for subscriber wireless access is received. In FIG. 2, reference numeral 15 denotes an antenna for subscriber wireless access;
Reference numeral 7 denotes a feed line and a channel selector for this. Further, in FIG. 1, one antenna for ground wave and B
Although an antenna for S / CS is shown, a portion composed of 2, 3, and 6 is used for terrestrial waves, and a BS / CS antenna 1
2. Feed line 13 and channel selector 14 are connected to BS /
It may be provided separately for CS. Reference numeral 21 denotes a BS / CS antenna cable, and reference numeral 22 denotes an antenna cable for subscriber wireless access.

In an urban area, a trunk line of optical fiber is set up, and a subscriber wireless access for transmitting a signal by radio over the last 100 m, that is, an end portion other than the telephone line is planned. This enables high-speed data transmission over the Internet or the like, and it is expected that demand will increase further in the future.
The frequency is planned to be in the 26 GHz band, and a signal of this frequency is similarly connected to a channel selector 17 for down-converting the signal to baseband. The signal is transmitted in the home in the same way as the TV signal, and the RF band is
(26 GHz band). In order to display the Internet information, a modem is required as the converter 23, and the converter 23 may be provided in the TV device 11 as a set-top box.

[0025]

As described above, according to the present invention, at least one antenna for receiving a TV signal, a channel selector for down-converting a high-frequency TV signal from this antenna to near a baseband, And a multiplexing circuit inserted into the power line and connected to the channel selector, for transmitting a TV signal received by the antenna together with the low-frequency power in one direction on the power line. Since it is a complex wiring system characterized by being equipped, it is possible to transmit the low frequency power of the commercial power frequency and the high frequency TV signal through one existing power line, and it is necessary to newly install a dedicated high frequency wiring in the house. In addition, since there is no need for special wiring, a low-cost composite wiring system can be obtained.

The power line comprises a main power line connected to the input side of the multiplexing circuit and a branch power line for branching the output of the multiplexing circuit, and an outlet terminal provided at the tip of the branch power line; The composite wiring system according to claim 1, further comprising an up-converter connected to the terminal to separate the low-frequency power and the TV signal, and a TV device connected to the up-converter. There is an advantage that the TV device can be freely arranged at the place where the outlet terminal is arranged. Further, the equipment to be added is a channel selector, a multiplexing circuit, an outlet terminal, and an up-converter, which can be realized at a low price without having to provide many devices for photoelectric mixing as in the related art.

[0027] Further, since the multiplexing circuit includes an amplifier for amplifying a high-frequency signal, the composite wiring system according to claim 1 or 2, wherein the high-frequency signal is high enough to withstand large attenuation in a power line. By amplifying the signal, the high-frequency signal received by the antenna can be reliably transmitted to the outlet terminal.

The radio communication system further includes a subscriber-system radio access antenna and a channel selector for down-converting a radio communication signal from the radio access antenna to a vicinity of a base band and inputting the converted signal to the multiplexing circuit. Since the wireless communication signal is also multiplexed, the high-frequency wireless communication signal from the subscriber wireless access antenna can be transmitted through the existing power line.

[0029] Further, the radio communication system further comprises a subscriber system radio access antenna and a channel selector for down-converting a radio communication signal from the radio access antenna to a vicinity of a baseband and inputting the converted signal to the multiplexing circuit. 3. The composite wiring system according to claim 2, wherein the wireless communication signal is also multiplexed, and the TV device further includes a converter for the wireless communication. Information of a high-frequency wireless communication signal can also be reproduced by the TV device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a composite wiring system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a composite wiring system according to another embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional complex wiring system of this type.

[Explanation of symbols]

1 main power line, 2 antennas, 3,13,16 feed line, 4 branch power line, 5 outlet terminals, 6,1
4, 17 channel selector, 7 multiplexing circuit, 7a amplifier, 9 up converter, 8, 10 power cable, 11 TV equipment, 12 BS / CS antenna, 15
Subscriber wireless access antenna, 20 TV antenna cable, 21 BS / CS antenna cable, 22
Subscriber wireless access antenna cable, 23 converter.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroyuki Omine 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C056 FA02 FA08 FA20 HA01 HA13 HA14 JA06 5K046 AA03 BA02 BB03 CC02 PS01 PS31 YY02

Claims (5)

[Claims] At least one antenna for receiving a TV signal, a channel selector for down-converting a high-frequency TV signal from the antenna to near a baseband, a power line for transmitting low-frequency power, and a power line And a multiplexing circuit that is connected to the channel selector and transmits the TV signal received by the antenna together with the low frequency power in one direction on the power line. . 2. The power line comprises: a main power line connected to an input side of the multiplexing circuit; and a branch power line for branching an output of the multiplexing circuit; an outlet terminal provided at a tip of the branch power line; The composite wiring system according to claim 1, further comprising: an up-converter connected to a terminal to separate low-frequency power and a TV signal; and a TV device connected to the up-converter. 3. The multiplexing circuit according to claim 1, further comprising an amplifier for amplifying a high-frequency signal.
A composite wiring system according to item 1. 4. A subscriber-system wireless access antenna and a channel selector for down-converting a wireless communication signal from the wireless access antenna to a vicinity of a baseband and inputting the converted signal to the multiplexing circuit, wherein the multiplexing circuit is provided. The wireless communication signal is also multiplexed.
A composite wiring system according to item 1. 5. A subscriber radio access antenna and a channel selector for down-converting a radio communication signal from the radio access antenna to a vicinity of a baseband and inputting the down-converted signal to the multiplexing circuit, wherein the multiplexing circuit is provided. The composite wiring system according to claim 2, wherein the wireless communication signal is also multiplexed, and the TV device further includes a converter for the wireless communication.