KR20000018419A - Device for transmitting high frequency signal using a power line - Google Patents

Abstract

PURPOSE: A device for transmitting a high frequency signal is provided to transmit the high frequency signal of a cable communication network to each communication devices, using a power line in the building. CONSTITUTION: A device for transmitting a high frequency signal comprises: a power-line coupling section for transmitting/receiving a communication information signal through a power line, and blocking a 60Hz power signal; an automatic gain controller for compensating the size of an information signal, received via the power-line coupling section; a frequency upward processor for upward processing the inputted information signal from the automatic gain controller, to a high frequency band signal which a cable modem can recognize; a frequency downward processor for downward processing central frequency of an internet service channel signal to a communication band signal, appropriate to the power-line; a variable sinewave generator for generating local sinewave frequency to a service channel setting signal, set by a communication terminal device to supply the local sinewave frequency on the upward/downward frequency processor; a power-line communication amplifier for amplifying an output signal of the downward processor to a transmission level of the power-line, and outputting to the power-line coupling section.

Description

High Frequency Signal Transmission Device Using Power Line

The present invention relates to a high frequency signal transmission apparatus using a power line, and in particular, a high frequency signal transmission using a power line to transmit a high frequency signal of a cable communication network to each communication device distributed in a building using a power line provided in a building. Relates to a device.

In general, a modem capable of converting and demodulating analog signals is used in a communication system using a telephone line. However, recently, communication networks that can provide significantly faster data transmission and various services than these modems have been limited. For example, cable TVs that implement transmission speeds of up to 30Mbps using cable TV networks or telephone lines are used as they are. The Digital Subscriber Network (xDSL) capable of transmitting MPEG level video signals in real time, or the Wireless Subscriber Network (WLL) that implements data and telephone networks wirelessly. The wide area network is basically a service provider (Service Provider) to provide a communication service to subscribers by cable, telephone line and wireless. For example, in the case of the cable modem using the cable TV network, a service provider transmits a communication signal to each subscriber's home by using a device that interworks the cable network with an internet network at a cable broadcasting station, and the subscriber uses a cable modem to connect the cable channel. 1-2 will be used for Internet communications.

Among such wide area networks, a communication network using a cable TV system is shown in FIG. 1. Referring to FIG. 1, the communication network includes a splitter 71 for separating a cable TV broadband signal input from a cable carrier's transmission device 70 into a cable TV signal and a cable modem signal, and the splitter 71. A cable TV converter 72 for converting a wideband high frequency signal for cable TV into a plurality of channel signals, and a wideband high frequency signal separated from the splitter 71 connected to the distributor 71 and It consists of cable modems 73A and 73B which convert to Internet signals through two channels.

The TV 74 is connected to the output terminal of the cable TV converter 72, and the personal computers 75A and 75B are connected to the output terminals of the cable modems 73A and 73B.

In this case, when each subscriber wants to use the Internet service, the cable 76 is installed from the distributor 71 to the place where the personal computer is located, and the cable modems 73A and 73B are installed at the installed end thereof. The personal computers 75A and 75B are connected to the cable modems 73A and 73B for use.

The operation of the communication network using the conventional cable TV system configured as described above is as follows.

When the broadband high frequency information signal is supplied to the splitter 71 from the transmission device 70 on the cable carrier side, the splitter 71 separates the wideband signal for cable TV into a signal for cable TV and a signal for a cable modem. Transmission is carried out to the TV converter 72 and the cable modems 73A and 73B, respectively. At this time, if the subscriber selects a channel to watch TV 74, the cable TV converter 72 converts the wideband high frequency signal for cable TV separated from the distributor 71 into a plurality of channel signals and the current TV 74 Channel channel selected from the key panel of the " During this process, if the subscriber wants to use the Internet service with his or her personal computer 75A, 75B, the cable modem 73A, 73B may assign a broadband high frequency signal separated from the distributor 71 to one of the cable channels. -Demodulates the internet signal by receiving it through two channels. The cable modems 73A and 73B transmit the demodulated Internet signals to the corresponding personal computers 75A and 75B to use the subscriber Internet network.

However, the communication network using the conventional cable TV system has a cable TV entry terminal in most subscriber homes, such as a living room. Expensive cables must be re-installed to the vicinity of the personal computers 75A and 75B. However, such a separate cable construction work is expensive and there is a problem in that to damage the internal structure of the existing building to install this.

An object of the present invention is to solve the above problems, by using a power line installed in the building to transmit a high-frequency signal of the cable network to each communication device distributed in the building, a separate cable communication network It is to provide a high frequency signal transmission apparatus using a power line that can reduce the installation cost according to the hypothesis.

Another object of the present invention is to provide a high-frequency signal transmission apparatus using a power line that can eliminate the inconvenience caused by the construction work because no additional network construction work is required.

1 is a block diagram illustrating a conventional cable communication network,

2 is an explanatory diagram for explaining a cable communication network to which the apparatus of the present invention is applied;

3 is a block diagram illustrating the configuration of the apparatus of the present invention.

Explanation of symbols on the main parts of the drawings

1: transmission device

2: divider

3: cable TV converter

4: cable modem

5: power line

6: first power line transmitter

7: second power line transmitter

8: TV

9: personal computer

10: power line coupling unit

11: automatic gain controller

12: frequency upstream processor

13: Frequency Down Processing Unit

14: variable sinusoidal oscillator

15: power line communication amplifier

16: mixer

17: Bandpass Filter

18: cable

19: Mixer

20: band pass filter

In order to achieve the above object, the present invention provides a power line coupling device unit coupled to a power line for transmitting and receiving a communication information signal through the power line and blocking a 60 Hz power signal, and an information signal received via the power line coupling device unit. An automatic gain controller for compensating for the amplitude of the original signal, a frequency upstream processor for up-processing the information signal input from the automatic gain controller into a high frequency band signal that can be recognized by the cable modem, and a communication band suitable for the power line. A local frequency sine wave corresponding to the service channel setting signal set by the communication terminal device to supply a local sine wave frequency to the frequency up and down processor and the frequency up and down processor; A variable sinusoidal oscillator, and the frequency down processing The present invention provides a high frequency signal transmission apparatus using a power line, comprising a power line communication amplifier for amplifying a negative output signal to a power line transmission level and outputting the negative output signal to a power line coupling device unit.

Hereinafter, preferred embodiments of the device of the present invention will be described in detail with reference to the accompanying drawings.

2 is an explanatory diagram illustrating a cable communication network to which the apparatus of the present invention is applied.

As shown in FIG. 2, a cable communication network to which the apparatus of the present invention is applied includes a splitter for separating the cable TV broadband signal inputted from the cable carrier operator 1 into a cable TV signal and a cable modem signal. 2), a cable TV converter 3 for converting the wideband high frequency signal for cable TV separated from the splitter 2 into a plurality of channel signals, and a wideband high frequency signal separated from the splitter 2; A first power line transmitter connected to the cable modem terminal of the splitter 2 and the power line 5 to convert the Internet signal through the 1-2 channels, 6) and a second power line transmitter 7 connected between one end of the power line 5 in the building connected to the first power line transmitter 6 and the cable modem 4 to perform power line communication. .

The TV 8 is connected to the output terminal of the cable TV converter 3, and the personal computer 9 is connected to the output terminal of the cable modem 4.

3 is a block diagram of the apparatus of the present invention.

The first and second power line transmitters 6 and 7 according to the present invention, as shown in FIG. 3, are coupled to the power line 5 to transmit and receive communication information signals transmitted through the power line 5, and have a power of 60 Hz. The power line coupling device unit 10 for blocking the signal, an automatic gain controller 11 for compensating the magnitude of the information signal received via the power line coupling device unit 10 to the size of the original signal, and the automatic gain controller A frequency upstream processor 12 for up-processing the information signal inputted from 11 into a high frequency band signal recognizable by the cable modem 4, and a communication band signal suitable for the power line 5, Service channel setting set by a communication terminal, for example, a personal computer 9, to supply a local sine wave frequency to the frequency downlink processor 13 for down-processing the center frequency and the frequency up-down processor 12, 13; signal A variable sine wave oscillator 14 generating a corresponding local sine wave frequency, and a power line communication amplifier 15 for amplifying the output signal of the frequency downlink processor 13 to a power line transmission level and outputting it to the power line coupling device unit 10; It includes.

In addition, the frequency upstream processor 12 converts the information signal transmitted through the power line 5 into a high frequency band signal that can be recognized by the cable modem 4 and the local sinusoidal frequency signal of the variable sinusoidal wave generator 14. And a band pass filter 17 for filtering a required band from the high frequency band signal output from the mixer 16.

In addition, the frequency down processor 13 mixes the local sinusoidal frequency signal of the variable sinusoidal wave generator 14 to convert only the Internet service channel signal of the broadband signal of the cable 18 into a band suitable for power line communication and outputs the frequency downlink. And a band pass filter 20 for filtering the communication signal output frequency down by the mixer 19 into a required band.

The operation of the power line transmitter according to the present invention configured as described above will be described.

When the transmission device 1 of the cable communication provider supplies the broadband high frequency information signal to the splitter 2, the splitter 2 separates the wideband signal for cable TV into a signal for cable TV and a signal for a cable modem, thereby converting the cable TV converter. 3 and the first power line transmitter 6, respectively. At this time, if the subscriber selects a channel to watch TV 8, the cable TV converter 3 converts the broadband high frequency signal for cable TV separated from the distributor 2 into a plurality of channel signals in a conventional manner, The channel signal currently selected from the key panel of the TV 8 is tuned to the TV 8.

If the subscriber wants to use the Internet service with his or her personal computer 9, the user sets the Internet channel use setting signal through the key panel. Accordingly, the cable modem 4 modulates the Internet channel use setting signal and modulates the cable. Input to the mixer 19 of the frequency down processor 13 of the second power line transmitter (7) through (18). In the mixer 19 of the frequency downlink processor 13, a variable sine wave is used to convert the input Internet channel setting signal into a signal suitable for power line transmission, for example, to facilitate power line transmission even in a load increase or signal attenuation state of the power line. The frequency is mixed with the local sinusoidal frequency signal of the generator 14 and then lowered to the band pass filter 20.

In the band pass filter 20, only the necessary band is filtered out of the Internet channel use setting signal frequency down by the mixer 19 and transmitted to the power line 5 through the power line coupling device unit 10. The communication signal thus transmitted is transmitted through the power line 5 and is input to the power line coupling device unit 10 of the first power line transmitter 6. The Internet channel use setting signal detected by the power line coupling device unit 10 is input to the automatic gain controller 11 of the first power line transmission device 6 and compensated to the magnitude of the original signal, and then the frequency uplink processing unit ( Input to mixer 16). Therefore, the mixer 16 of the frequency upstream processor 12 receives the local sine wave frequency from the variable sinusoidal wave generator 14, mixes the same together, and converts the frequency upstream to the broadband frequency level. Enter The band pass filter 17 then band-filters this input signal and inputs it to the divider 2 via a cable 18.

On the other hand, the Internet channel use setting signal via the distributor 2 is input to the transmission device 1 of the cable communication provider is judged whether the Internet use. If the cable communication service provider is allowed to use the Internet, the cable service provider transmits Internet service information through the transmission device 1. The broadband signal on which the Internet information is loaded is input to the mixer 19 of the frequency down processor 13 of the first power line transmitter 6 via the cable modem terminal of the splitter 2. The mixer 19 of the frequency downlink processor 13 converts the input Internet information signal into a signal suitable for power line transmission. For example, the variable sine wave generator can be used to facilitate power line transmission even under load increase or signal attenuation of the power line. It is mixed with the local sinusoidal frequency signal of (14), and the frequency is lowered and input to the band pass filter 20. In the band pass filter 20, only the necessary band is filtered out of the Internet information signal frequency down by the mixer 19 and transmitted to the power line 5 through the power line coupling device unit 10.

The communication signal thus transmitted is transmitted through the power line 5 and is input to the power line coupling device unit 10 of the second power line transmitter 7. The Internet channel use setting signal detected by the power line coupling device unit 10 is input to the automatic gain controller 16 of the second power line transmission device 7 and compensated to the magnitude of the original signal. Input to mixer 16). Therefore, the mixer 16 of the frequency uplink processor 12 receives the local sine wave frequency from the variable sinusoidal wave generator 14 and mixes the received communication signal with the original frequency band that the cable modem 4 can recognize. Upconvert to.

The Internet information signal thus converted into the original frequency band is band-filtered through the band pass filter 17 and then input to the cable modem 4 to demodulate. The demodulated Internet information signal is input to the personal computer 9, which is normally used. Internet information will be available.

According to the embodiment of the present invention described above, only the cable network has been described, but the apparatus of the present invention can be applied equally to a wide area network such as ADSL using a telephone line or WLL using wireless.

As described above, the present invention transmits a high frequency signal of a cable communication network to each communication terminal device distributed in a building by using a power line provided in a building, thereby eliminating the need for a separate cable communication network. The high-frequency signal is transmitted using the power line as it is, and thus additional installation cost according to the cable communication network hypothesis is not required, and inconveniences in connection work are also eliminated.

Claims (5)

A divider (2) for separating the cable TV broadband signal input from the transmission device (1) of the cable telecommunications carrier into a signal for cable TV and a signal for a cable modem, and a channel allocated to the broadband signal separated from the splitter (2). In the cable communication network provided with a cable modem (4) for converting into Internet signals through A first power line transmitter 6 connected between the cable modem terminal of the splitter 2 and the power line 5 to perform power line communication, and a power line 5 in the building connected to the first power line transmitter 6; And a second power line transmitter (7) connected between one end of the cable and the cable modem (4) to perform power line communication. The power line coupling device unit of claim 1, wherein the first and second power line transmitters 6 and 7 are coupled to the power line 5 to transmit and receive communication information signals through the power line 5, and to block the power signals. 10), the automatic gain controller 11 which compensates the magnitude of the information signal received via the power line coupling device unit 10 to the magnitude of the original signal, and the information signal input from the automatic gain controller 11; A frequency uplink processor 12 for up-processing the radio frequency signal recognizable by the cable modem 4, and a frequency downlink processor for down-processing the center frequency of the Internet service channel signal with a communication band signal suitable for the power line 5; (13) and a variable sine wave oscillation generating a local sine wave frequency corresponding to a service channel setting signal set by a communication terminal device for supplying local sine wave frequencies to the frequency up and down processing units 12 and 13 And a power line communication amplifier (15) for amplifying the output signal of the frequency downlink processor (13) to a power line transmission level and outputting the power signal to the power line coupling device (10). Signal transmitter. The high frequency signal transmission apparatus using a power line according to claim 2, wherein said communication terminal apparatus is a personal computer (9). The mixer of claim 2, wherein the frequency uplink processor 12 mixes and outputs the local sinusoidal frequency signal of the variable sinusoidal wave generator 14 to convert the information signal transmitted through the power line 5 into a high frequency band signal. 16) and a band pass filter (17) for filtering only the necessary bands from the high frequency band signals output from the mixer (16). 3. The frequency downlink processor (13) according to claim 2, wherein the frequency downlink processor (13) is mixed with a local sinusoidal frequency signal of the variable sinusoidal wave generator (14) to convert only the Internet service channel signal of the broadband signal of the cable (18) into a band suitable for power line communication. A high frequency signal transmission apparatus using a power line, characterized by comprising a mixer (19) for outputting down and a band pass filter (20) for filtering a communication signal output frequency down by the mixer (19) to a required band.