KR20040094997A - Broadcasting receiving system using hight speed power-line communication - Google Patents

Abstract

PURPOSE: A broadcast receiving system using high-speed PLC(Power Line Communication) is provided to transmit a broadcasting signal with power through a power line, so that a receiver can reproduce a video or a voice by detecting the broadcasting signal transmitted with the power, thereby reducing wires of the system. CONSTITUTION: A repeater(32) receives a broadcasting signal from a broadcasting signal source(31), modulates the broadcasting signal such that the modulated broadcasting signal can be transmitted without signal loss or signal distortion through a power line(33), and outputs the modulated broadcasting signal to the power line(33). The power line(33) transmits the outputted broadcasting signal with a common AC power. A receiver(34) receives the power and the broadcasting signal from the power line(33), demodulates the broadcasting signal, and reproduces a video and a voice.

Description

Broadcasting receiving system using hight speed power-line communication

The present invention relates to a broadcast receiving system for receiving an over-the-air broadcast or cable broadcast signal and sending it to a subscriber TV so that the subscriber can watch the broadcast. More particularly, the present invention relates to a wiring by transmitting a broadcast signal through a power line for supplying power to a receiver. The present invention relates to a broadcast receiving system using high-speed power line communication.

With the development of communication technology, various communication media have emerged, and various media such as satellite broadcasting and cable broadcasting have been provided as well as over-the-air broadcasting.

1 and 2 are block diagrams illustrating a receiving system for over-the-air broadcasting and a receiving system for cable broadcasting, respectively.

Referring to FIG. 1, a reception system of an airwave broadcasting system connects a power line 12 connected to a power plant to a power terminal 112a connected to a power supply 112 of a receiver 11, and a signal terminal connected to a tuner unit 111. The terminal 111a is connected to one terminal of the coaxial cable 13, which is a signal transmission line, and the other terminal of the coaxial cable 13 is connected to the antenna 14. When such a configuration is completed, the power supplied through the power line 12 is rectified and converted by the power supply unit 112 to be provided to the internal device of the receiver 11 to operate, and at this time, received from the antenna 14 The over-the-air broadcast signal is input to the tuner unit 111 via the coaxial cable 13 and output as video and audio. The tuner 111 selects and receives an airwave signal of a predetermined channel, and then outputs the video and audio signals to other means at a later stage functioning to output the video and audio signals through the screen and the speaker, respectively. The construction and operation in the receiver 11 are generally well known, and thus further description thereof will be omitted.

In addition, referring to FIG. 2, the cable broadcasting receiving system connects a power line 22 connected to a power plant to a power supply terminal 212a connected to a power supply unit 212 of a receiver 21 to receive operating power, and a tuner unit ( A signal terminal 211a connected to 211) is connected to one terminal of a coaxial cable 23, which is a signal transmission line, and the other terminal of the coaxial cable 13 is connected to a repeater 24 for amplifying and delivering a cable broadcast signal, The repeater 24 is connected to the broadcast signal source 25 via another coaxial cable. When the configuration is completed, the receiver 21 operating by receiving power through the power line 22 receives the channel signal selected from the broadcast signals transmitted through the coaxial cable 23 and the repeater 24 to receive video and audio. The signal is output by other means at the rear end which functions to output it through the screen and the speaker, respectively.

As described above, the conventional broadcast receiving system has a disadvantage in that wiring is complicated due to a power line for supplying power and a signal line for transmitting a signal. This wiring problem not only increases the connection means of the broadcast receiver, but also causes a complicated design and construction related to the wiring at the time of construction.

However, with the recent development of digital communication technology, various communication systems have emerged, and a power line communication technology for transmitting data through a power line for supplying 60 Hz AC power has been developed. The communication system is largely divided into wired communication and wireless communication. The power line communication is a wired communication, but since the existing power line is used, a new wire is not necessary, and thus, a wired and wireless type can be considered.

Such power line communication technology is currently applied only to home automation systems that control the operation of home electronic devices, and has not been applied to communication systems or broadcasting systems that require a large amount of data.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is to simplify the wiring and reduce the number of connecting parts by transmitting a broadcast signal through a power line for supplying power, thereby facilitating management and installation and reducing costs. The present invention provides a broadcast receiving system using high-speed power line communication.

1 is a block diagram showing a conventional over-the-air broadcasting reception system.

2 is a block diagram illustrating a conventional cable broadcast receiving system.

3 is a block diagram illustrating a broadcast receiving system using high-speed power line communication according to the present invention.

4 (a) and 4 (b) are block diagrams showing the configuration of a high speed power line modem included in the broadcast receiving system according to the present invention.

5 is a detailed block diagram illustrating a configuration of a coupler included in the broadcast receiving system according to the present invention.

Explanation of symbols on the main parts of the drawings

31: broadcast signal

32: Repeater

33: power line

34: receiver

As a construction means for achieving the above object, the present invention provides a broadcast receiving system for receiving a broadcast signal provided by a broadcaster to reproduce video and audio,

A filter for removing noise mixed in a broadcast signal, a low noise amplifier for amplifying a broadcast signal passing through the filter to a predetermined level, an oscillator for generating carrier waves in a frequency band used in a high-speed power line communication system, and an output from the oscillator A mixer that mixes a carrier wave and a broadcast signal output from the low noise amplifier and converts the broadcast signal to a frequency of a high-speed power line communication method, and a power line so that the broadcast signal output from the mixer is transmitted with a power supply without signal distortion or loss. It consists of a high-speed power line modem that modulates by a communication method, and a coupler that couples the modulation signal output from the high-speed power line modem with a commercial power source while preventing inflow of AC connected to the power line according to the high-speed power line communication method. A repeater for modulating and applying the power line;

A power line to which an output signal of the repeater and a commercial AC power are input and transmitted; And

A high speed power line modem including a coupler connected to the power line to detect a signal of a predetermined frequency band from a power source, and a high speed power line modem for demodulating the signal of the predetermined band extracted from the coupler according to a power line communication scheme to a original signal. The present invention provides a broadcast receiving system of a high-speed power line communication system comprising a receiver for receiving a transmitted broadcast signal and reproducing video and audio.

Also, in the broadcast receiving system of the present invention, the repeater's high-speed power line modem performs an interface unit to which a broadcast signal to be transmitted is connected, performs frame control FEC encoding, data FEC encoding, and OFDM modulation, A transmission signal processor for modulating the input broadcast signal by a high-speed power line method, a digital / analog converter for converting the broadcast signal output from the transmitter signal processor into an analog signal, and outputting the analog signal, and an output signal of the digital / analog converter. And a transmission amplifier section for amplifying and outputting a signal passing through the transmission filter section with a predetermined gain.

In the broadcast receiving system of the present invention, the high-speed power line modem of the receiver receives a signal extracted from a coupler and passes only a signal of a reception band, and a received signal passing through the reception filter unit with a predetermined gain. An analog / digital converter for amplifying a reception amplifier, an analog / digital converter for converting a signal output from the reception amplifier into digital data, a frame control FEC decoding, a data FEC decoding, an OFDM demodulation function, and the analog / digital converter And a reception signal processing unit for restoring the data output from the broadcast signal to a broadcast signal, and an interface unit for outputting the broadcast signal output from the reception signal processing unit to the broadcast signal processing circuit.

In addition, in the broadcast receiving system of the present invention, the coupler is connected to a power line to prevent the input of a very large surge on the power line (surge) and the instantaneous surge absorbing means connected to the instantaneous surge absorbing means and the signal input from the power line Power removal means for removing the commercial power of 60Hz at, the first end is connected to the power removal means and the second end is connected to the signal line side to shield DC, AC and extract only the signal of the predetermined band or the signal of the predetermined band 1 A transformer means coupled with the interrupting power source, and an instantaneous voltage blocking means provided between the secondary coil and the signal line of the transformer means to block an applied voltage above a predetermined voltage from the transformer means to protect the device. do.

Hereinafter, a broadcast reception system using high speed power line communication according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing the overall configuration of a broadcast receiving system using high-speed power line communication according to the present invention, after the system has received a broadcast signal from the broadcast signal source 31 and the broadcast signal source 31. A broadcast signal output from the repeater 32 along with a commercial alternating power source and a repeater 32 that modulates a broadcast signal on the power line 33 so that a signal loss or distortion up can be transmitted, and then outputs the power signal to the power line 33. The power line 33 and together with the power line 33 is connected to the power line 33 receives the power and broadcast signals from the power line 33, while operating by the power to demodulate the broadcast signal from the full power to the video and audio Receiver 34 for playing the music.

In this case, the repeater 32 may include a filter 321 for removing noise mixed in the input broadcast signal, a low noise amplifier 322 for amplifying the broadcast signal passing through the filter 321 to a predetermined level, and a high-speed power line. An oscillator 323 for generating a carrier wave in a frequency band used in a communication method, a carrier signal output from the oscillator 323 and a broadcast signal output from the low noise amplifier 322 are mixed to convert a broadcast signal into a frequency band of a high speed power line communication method. A high-speed power line modem 325 and a power line 33 for encoding a broadcast signal output from the mixer 324 to be transmitted without a signal distortion or loss through a power source. It is composed of a coupler 326 for coupling the commercial power of the power line 33 to the modulated broadcast signal output from the high-speed power line modem 325 while preventing reverse entry of alternating current.

In addition, the receiver 34 is a power supply terminal 341a connected to the power line 33 and a power supply unit 341 connected to the power supply terminal 341a to receive rectified and transformed commercial power to supply power to the receiver. And a coupler 342 connected to the power supply terminal 341a for removing commercial power and extracting only a signal, and a high-speed power line modem 343 for demodulating the signal extracted through the coupler 342 and converting the signal into a broadcast signal. And a tuner 344 that receives a broadcast signal output from the high speed power line modem 343 and performs a tuning operation.

The broadcast receiving system of the present invention configured as described above transmits the AC power and the broadcast signal at the same time through the power line, and separates it from the receiver and uses the AC power as the operating power, and extracts the broadcast signal to play the video and audio. In detail, the specific action is as follows.

First, the broadcast signal source 31 represents a broadcast signal source composed of video and audio and provided to a receiver of a subscriber. The broadcast signal source 31 is installed in each subscriber's home and receives a wireless broadcast signal transmitted over the air in the case of an over-the-air broadcast. Refers to an antenna for converting, and in the case of cable broadcasting, refers to a cable broadcasting company or a cable broadcasting company that transmits a broadcast signal to each subscriber by wire.

Regardless of which signal source is used above, it is connected to the power line 33 which is connected to the subscriber's home through the repeater 32 to couple the broadcast signal to the power source.

The repeater 32 receives a high frequency broadcast signal transmitted from each broadcaster to a subscriber, converts the input broadcast signal into a form that can be transmitted without distortion or loss with the power supply through the power line 33, and is coupled to the power supply. As a device for firstly, first, the filter 321 receives a high frequency broadcast signal transmitted by a broadcaster input from the signal source 31, filters and passes only the broadcast frequency band, and prevents the reception of noise signals in other bands.

As described above, the high frequency broadcast signal passing through the filter 321 is amplified by the low noise amplifier 322 at a predetermined amplification rate to increase the signal gain. The oscillator 323 and the mixer 324 are frequency-converted to the band used in the high-speed power line modem. For example, the high frequency broadcast signal of the VHF or UHF band is frequency down to the 30 MHz band.

The broadcast signal, which is frequency-converted by the mixer 324, is input to the high speed power line modem 325 and modulated according to the power line communication method. In general, a high-speed power line modem is manufactured and manufactured by a plurality of communication companies, the basic configuration of which is shown in Figure 4 (A), (B). In Fig. 4, (A) is a block diagram of the reception side of the high speed power line modem, and (B) is a block diagram of the transmission side of the high speed power line modem.

The high speed power line modem 325 provided in the repeater 32 converts a broadcast signal into a power line communication signal, and converts the signal into a signal of a high speed power line communication system with a predetermined signal configured as shown in FIG. And a transmission unit coupled to the power supply.

That is, the high-speed power line modem 325 of the repeater 32 is connected to the output of the mixer 324 from the interface unit 46 to receive the transmission data (broadcast signal), and the broadcast signal thus input is transmitted to the transmission signal processing unit ( The broadcast signal to be transmitted is modulated in accordance with the high-speed power line communication method standardized at 47). In this case, the transmission signal processor 47 performs frame control FEC encoding, data FEC encoding, and OFDM modulation. Next, the broadcast signal modulated by the transmission signal processing unit 47 is converted into an analog signal by the D / A converter 48 and then output through the transmission filter unit 49 and the transmission amplifier unit 50.

Referring to FIG. 3 again, as described above, the broadcast signal modulated by the power line communication method output from the high speed power line modem 325 is coupled to the AC power of the power line 33 through the coupler 326. At this time, the coupler 326 couples the broadcast signal with the power of the power line 33 and prevents the high power power signal from flowing back to the high speed power line modem 325 later.

As shown in FIG. 5, the coupler 326 is connected to a power line 33 and includes a surge absorbing means 51 for preventing a very large surge on the power line 33 and the instantaneous surge absorbing means 51. Connected to the power supply 33 to remove the commercial power of 60Hz from the signal input from the power line 33, the primary coil is connected to the power removal means 52 and the secondary coil is connected to the signal line side And a trans means 53 for shielding DC and AC and extracting only signals of a predetermined band or combining signals of a predetermined band with a power source on the primary side, and between the secondary coil and the signal line of the trans means 53. And an instantaneous voltage interruption means 54 for protecting the device by interrupting the applied voltage above a predetermined voltage from the means 53 side.

The coupler 326 included in the repeater 32 performs a function of coupling a modulated broadcast signal input from the high-speed power line modem 325 to an AC power supply, and an instantaneous surge voltage that may be generated from the power line 33. Alternatively, the repeater 32 is protected by blocking a voltage above a certain level.

By the processing of the repeater 32, a low-frequency commercial AC power supply and a power line communication signal of a predetermined frequency band flow together on the power line 33, and the power supply and the signal flow through the power line 33, and the receiver 34 Is inputted to the power supply terminal 341a.

At this time, in the receiver 34 according to the present invention, the power supply unit 341 is connected to the power supply terminal 341a, and the tuner 344 is connected to the power supply unit 343 through the coupler 342 and the high speed power line modem 343. Power and signals input from the power line 33 are separated and processed respectively.

That is, the power supply unit 341 rectifies and DC / AC converts the AC commercial power input from the power line 33 as in the related art to provide the operating power of the receiver.

At this time, the coupler 342 has a configuration as shown in Figure 5, similar to the coupler 326 of the repeater 32, the main function is to remove the power from the combined signal of the power and the signal transmitted to the power line 33 It detects signals in the frequency band and protects the receiver by blocking voltage and transient surges above a certain level.

As described above, the signal detected from the power supply by the coupler 342 is input to the high speed power line modem 343 and demodulated into the original broadcast signal.

The high speed power line modem 343 of the receiver includes a receiving unit shown in FIG. 4A, and the power line communication signal extracted by the coupler 342 is input to the receiving filter unit 41 to set the power line. Only the communication band signal is filtered, amplified by the reception amplifier 42 to have a predetermined gain, and then converted into digital data by the A / D conversion unit 43 and input to the reception signal processing unit 44. The received signal processor 44 has frame control FEC decoding, data FEC decoding, and OFDM demodulation functions to signal-process the input powerline communication data and restore the original data (broadcast signal). The restored broadcast signal is input to the tuner 344 through the interface 45. Subsequent signal processing is the same as that of a general receiver.

Therefore, power and signal transmission are possible through the power line, and the receiver can process the same to reproduce video and audio.

As described above, the broadcast receiving system of the present invention is configured to deliver not only a power source but also a broadcast signal through a power line, and processes a signal transmitted through the power line to reproduce video and audio normally. Since it can be used as it is, there is no need for a separate wiring work, there is an excellent effect of reducing the overall cost, and there is an effect that it is easy to install and manage as one connection line.

Claims (4)

In the broadcast receiving system for receiving a broadcast signal provided by a broadcaster to play a video and audio, A filter for removing noise mixed in a broadcast signal, a low noise amplifier for amplifying a broadcast signal passing through the filter to a predetermined level, an oscillator for generating carrier waves in a frequency band used in a high-speed power line communication system, and an output from the oscillator A mixer that mixes a carrier wave and a broadcast signal output from the low noise amplifier and converts the broadcast signal to a frequency of a high-speed power line communication method, and a power line so that the broadcast signal output from the mixer is transmitted with a power supply without signal distortion or loss. It consists of a high-speed power line modem that modulates by a communication method, and a coupler that couples the modulation signal output from the high-speed power line modem with a commercial power source while preventing inflow of AC connected to the power line according to the high-speed power line communication method. A repeater for modulating and applying the power line; A power line to which an output signal of the repeater and a commercial AC power are input and transmitted; And A high speed power line modem including a coupler connected to the power line to detect a signal of a predetermined frequency band from a power source, and a high speed power line modem for demodulating the signal of the predetermined band extracted from the coupler according to a power line communication scheme to a original signal. And a receiver for receiving the transmitted broadcast signal and reproducing the video and audio. The high speed power line modem of the repeater according to claim 1, wherein An interface unit for receiving a broadcast signal to be transmitted; A transmission signal processor for performing frame control FEC encoding, data FEC encoding, and OFDM modulation to modulate the broadcast signal input from the interface unit by a high-speed power line method; A digital / analog converter for converting the broadcast signal output from the transmission signal processor into an analog signal and outputting the analog signal; A transmission filter unit for passing only a signal of a predetermined band from the output signal of the digital / analog converter; And a transmission amplifier for amplifying and outputting the signal passing through the transmission filter with a predetermined gain. According to claim 1, wherein the high speed power line modem of the receiver A reception filter unit which receives a signal extracted from the coupler and passes only a signal of a reception band; A reception amplifier for amplifying the received signal passing through the reception filter with a predetermined gain; An analog / digital converter for converting the signal output from the reception amplifier into digital data; A reception signal processor for performing frame control FEC decoding, data FEC decoding, and OFDM demodulation functions to restore data output from the analog / digital converter to a broadcast signal; And a interface unit for outputting a broadcast signal output from the reception signal processor to a broadcast signal processing circuit. The method of claim 1, wherein the coupler A momentary surge absorbing means connected to the power line to block the input of a very large surge on the power line, A power removing means connected to the instantaneous surge absorbing means to remove 60 Hz commercial power from a signal input from a power line; A first stage is connected to the power removing means, and a second stage is connected to the signal line side to shield DC and AC, and extract only a signal of a predetermined band or combine a signal of a predetermined band with a power of a first stage; And a momentary voltage blocking means provided between the secondary coil of the trans means and a signal line to block an applied voltage of more than a predetermined voltage from the trans means side to protect the device.