KR200416498Y1 - Receiving system with combined Low Noise Blockdown Converter and Set-Top Box for outdoor - Google Patents

Abstract

An outdoor LNB / set top box integrated receiving system is disclosed. An outdoor LNB / set top box integrated receiving system according to an embodiment of the present invention includes a low noise blockdown converter (LNB), a divider, a controller, a descramble circuit, a third band block, and a mixer. The Low Noise Blockdown Converter (LBN) converts and outputs a frequency of an input video signal. The splitter separates and outputs the video signal output from the LNB. The controller extracts and demodulates a control channel signal from the video signal output from the distributor and outputs first and second address signals. The descrambler circuit descrambles the scrambled image signal among the image signals output from the divider in response to the first address signal and outputs the descrambled signal. The third band block outputs an unscrambled video signal among the video signals output from the distributor in response to the second address signal. The mixer mixes and outputs the output of the descramble circuit and the output of the third band block. The outdoor LNB / set-top box integrated receiving system according to the present invention can manufacture a LNB and a set-top box as an integrated outdoor unit and assign a separate address to the LNB and the set-top box to operate one receiving system together with two receiving systems. There is an advantage.

Description

Receiving system with combined Low Noise Blockdown Converter and Set-Top Box for outdoor}

A brief description of each drawing is provided to more fully understand the drawings, which are incorporated in the detailed description of the invention.

1 is a conceptual diagram illustrating an operation concept of an outdoor LNB / set-top box integrated receiving system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an outdoor LNB / set top box integrated receiving system of FIG. 1.

The present invention relates to a system for receiving video signals for television, and more particularly, to an LNB / set top box integrated reception system in which a low noise blockdown converter (LNB) and a set-top box are integrated and miniaturized for outdoor use. will be.

The traditional way of sending the same information or message from any place to several places, such as television program broadcasting, is achieved by broadcasting broadcasts from the central antenna of a broadcast station to a plurality of roof antennas within a transmission tower radius.

In order to solve the radio shade area during wireless broadcasting, a cable TV (CATV) network has been developed that provides a broadcast signal through a wire by directly connecting a cable between subscriber TVs. However, such a wired TV network is difficult to install or change subscriber lines, and installation cost is also very expensive, and maintenance, repair and management are also expensive and difficult.

Recently, with the development of wireless communication technology, wireless wired TV (hereinafter referred to as wireless CATV) system is being developed or commercialized.

The concept of the wireless CATV service network is briefly described. When a pay information signal is scrambled by a signal combiner from information sources such as information through broadcasting stations or satellites and various programs, up-modulated and transmitted by microwave through a frequency upconverter, It is received by the rooftop microwave antenna on the subscriber side through the transmission antenna installed on the top of the mountain and descrambled according to the VHF / UHF frequency using the frequency downconverter and then received by the TV receiver.

As one of the wireless CATV transmission methods, a multichannel multipoint distribution service (MMDS) method has been proposed.

 MMDS is suitable for one-way broadcasting service and the available frequency band of 2.5 GHz is suitable for small local broadcasting. Since MMDS uses 2.535 ~ 2.655㎓ (200MHz bandwidth) in Korea, it can transmit 20 channels in case of TV channel using 6MHz as one channel, and it can be increased by applying video compression technology.

MMDS systems are now commercially available in many countries around the world and are less expensive than LMDS systems. However, the bandwidth of the MMDS is somewhat limited, so it cannot provide a service requiring a wider bandwidth and can only provide one-way transmission.

Wireless CATV service using this MMDS method has overlapping bandwidth with public broadcasting such as VHF and UHF, so it has to be input indoors through a separate cable from public broadcasting, which makes installation and maintenance costs expensive and difficult to change after installation. have. In addition, the video signal transmitted by the MMDS scheme is a mixture of scrambled signals and unscrambled signals, but the receiver cannot select and view them.

An object of the present invention is to provide a low noise blockdown converter (LNB) and a set-top box (LNB) and a set-top box integrated receiving system integrated and miniaturized for outdoor use.

The outdoor LNB / set top box integrated receiving system according to an embodiment of the present invention for achieving the above technical problem includes a low noise blockdown converter (LBN), a divider, a controller, a descramble circuit, a third band block, and a mixer.

The Low Noise Blockdown Converter (LBN) converts and outputs a frequency of an input video signal. The splitter separates and outputs the video signal output from the LNB.

The controller extracts and demodulates a control channel signal from the video signal output from the distributor and outputs first and second address signals. The descrambler circuit descrambles the scrambled image signal among the image signals output from the divider in response to the first address signal and outputs the descrambled signal.

The third band block outputs an image signal output from the divider in response to the second address signal. The mixer mixes and outputs the output of the descramble circuit and the output of the third band block.

The video signal is a multichannel multipoint distribution service (MMDS) signal. The control unit includes a demodulator for demodulating command codes of the extracted control channel signal to generate a control signal, and a controller for generating the first address signal and the second address signal in response to the control signal.

The first address signal includes information necessary for descrambling operation of the descramble circuit, the second address signal turns on or turns off the third band block, and the first and second address signals are remoted. Control is possible.

The descramble circuit converts the frequency of the scrambled video signal to match the channel frequencies 3 and 4 of the home television. The LNB converts the frequency of the input video signal into a frequency between 610Mhz and 810Mhz.

It further comprises an MMDS / hearing broadcast combiner for combining the output of the mixer and the hearing broadcast signal and output with a single cable. The cable is a public hearing cable. The MMDS / Public Broadcast Combiner is a FAIL / SAFE type switch capable of remote control.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a conceptual diagram illustrating an operation concept of an outdoor LNB / set-top box integrated receiving system according to an embodiment of the present invention.

The present invention manufactures LNB and set-top box applied to MMDS (Multichannel Multipoint Distribution service) as an outdoor all-in-one and assigns address to LNB and set-top box, respectively, and enables outdoor remote LNB / set-top independently. A technique related to the box integrated receiving system 110 is provided.

The outdoor LNB / set-top box integrated receiving system 110 may simultaneously provide scrambled video signals to a plurality of video apparatuses using the function of the set-top box and the LNB.

Referring to the conceptual diagram 100 of FIG. 1, an image signal transmitted from an MMDS transmitter is input to an outdoor LNB / set top box integrated receiving system 110 through an MMDS antenna. The video signal has two addresses, each of which controls a descrambling circuit (not shown) and a third band block (not shown) inside the outdoor LNB / set-top box integrated receiving system 110. The two addresses, the descrambling circuit and the third band block will be described later.

In addition, the outdoor LNB / set-top box integrated receiving system 110 includes a VHF / UHF receiving terminal in the system to select and view public broadcasting such as general VHF (Very High Frequency) and UHF (Ultra High Frequency) with MMDS. It is configured to support directly. Therefore, the MMDS video signal and the public broadcast signal can be transmitted from the outdoor LNB / set-top box integrated receiving system 110 to the indoor with only one cable.

Since the broadcast broadcast signal and the MMDS video signal have the same frequency bandwidth, the outdoor LNB / set-top box integrated receiving system 110 selects and transmits one signal from the broadcast broadcast signal and the MMDS video signal.

If the signal transmitted indoors is an MMDS video signal, the unscrambled video signal is received in the normal channel, and the scrambled video signal is descrambled in the outdoor LNB / set-top box integrated receiving system 110 to be advanced. Is received.

The operation of the outdoor LNB / set top box integrated receiving system 110 may be controlled by two addresses, which will be described later. In FIG. 1, a bias tee serves to supply power.

FIG. 2 is a block diagram illustrating a configuration of an outdoor LNB / set top box integrated receiving system of FIG. 1.

2, the outdoor LNB / set-top box integrated receiving system 110 according to an embodiment of the present invention is a low noise blockdown converter (LNB) 210, a distributor 220, a controller 230, a descramble circuit 240, a third band block 245, and a mixer 250.

The Low Noise Blockdown Converter (LNB) 210 converts and outputs the frequency of the input image signal IS. The divider 220 separates and outputs an image signal ISL output from the LNB 210.

The controller 230 extracts and demodulates a control channel signal from the image signal ISL output from the divider 220 and outputs first and second address signals ADD1 and ADD2. The descrambler 240 descrambles the scrambled image signal among the image signals ISL output from the divider 220 in response to the first address signal ADD1 and outputs the descrambled image signal.

The third band block 245 outputs the image signal ISL output from the divider 220 in response to the second address signal ADD2. The mixer 250 mixes and outputs the output of the descramble circuit 240 and the output of the third band block 245.

The outdoor LNB / set-top box integrated receiving system 110 further includes an MMDS / public broadcasting combiner 260 that combines the output of the mixer 250 and the public broadcasting signal (VHF / UHF) and outputs it through one cable 265. do. For convenience of description, the power supply bias tees 290 and 300, the voltage source 270, and the remote controller 280 are shown together in FIG. 2.

Hereinafter, the operation of the outdoor LNB / set-top box integrated receiving system 110 according to an embodiment of the present invention with reference to Figure 2 will be described in detail.

The LNB 210 converts and outputs the frequency of the input image signal IS. The LNB filters the MMDS type video signal IS having a frequency of 2500Mhz to 2700MHz input through the antenna 201 through a band pass filter, and amplifies the frequency to an appropriate amplitude with a built-in low noise amplifier (not shown).

That is, the LNB 210 converts the frequency of the input image signal IS into a frequency between 610Mhz and 810Mhz and transmits the frequency to the distributor 220.

The controller 230 extracts and demodulates a control channel signal from the image signal ISL output from the divider 220 and outputs first and second address signals ADD1 and ADD2.

In more detail, the controller 230 demodulates a command code of the extracted control channel signal to generate a control signal CS, and a first address signal ADD1 and a response in response to the control signal CS. The controller 233 which generates the second address signal ADD2 is provided.

The first address signal ADD1 includes information necessary for the descramble operation of the descramble circuit 240. The second address signal ADD2 turns the third band block 245 on or off. The first and second address signals ADD1 and ADD2 can be remotely controlled.

The demodulator 231 extracts only the signals of the control channel transmitted from the remote control center of the operator controlling the entire network of the transmission and reception of the image signal among the image signals ISL transmitted through the distributor 220, and then commands each command. The code is demodulated and transmitted to the controller 233 as a control signal CS.

The controller 233 receives the demodulated control signal CS transmitted from the demodulator 231 and controls the operation of the entire outdoor LNB / set top box integrated receiving system 110. The controller 233 has remotely controllable first and second addresses ADD1 and ADD2, and the controller 233 performs command execution by the first and second addresses ADD1 and ADD2.

The first address signal ADD1 controls the tuner 241 of the descrambler circuit 240 and has information on the output of the tuner 241 and channel mapping. The first address signal ADD1 supplies signal information necessary for descramble to the tuner 241. do.

The second address signal ADD2 controls the third band block 245 to turn on / off so that the third band block 245 outputs the image signal ISL of the 610-810 MHz band.

The second address signal ADD2, which can be remotely controlled, is adjusted to turn on or turn off the third band block 245 as necessary to output or block the image signal ISL.

When the image devices in the home are classified into an image device for watching a descrambled image and an image device for viewing a transmitted image without being scrambled, the third band block 245 is turned on to be output from the distributor 220. The image signal ISL may be bypassed without passing through the descramble circuit 240 and applied to the image device in the home. Then, only the unscrambled video signal is watched except for the scrambled video signal.

The descrambler 240 descrambles the scrambled image signal among the image signals ISL output from the divider 220 in response to the first address signal ADD1 and outputs the descrambled image signal.

The descramble circuit 240 includes a tuner 241 and a modulator 243. The tuner 241 receives a video signal ISL branched from the splitter 220 and generates and outputs a baseband video signal and an audio signal. At this time, information necessary for descrambling for outputting an image is transmitted from the first address signal ADD1 of the controller 233 to perform a descrambling operation.

The modulator 243 receives a baseband video signal and an audio signal output from the tuner 241 and generates and transmits a composite signal (not shown) suitable for channel 3 and 4 of the home television.

Although the descramble circuit 240 includes only the tuner 241 and the modulator 243 in FIG. 2, the structure and function of the descramble circuit 240 are not limited thereto, and a general device that can be understood by those skilled in the art will be appreciated. It may be a scrambled circuit.

The mixer 250 mixes and outputs the output of the descramble circuit 240 and the output of the third band block 245. Outdoor LNB / set-top box integrated receiving system 110 having such a configuration can drive a plurality of imaging devices in one system.

That is, the outdoor LNB / set-top box integrated receiving system 110 according to the present invention transmits the descrambled broadcast signal through the frequency of channel 3 or 4 of the home television as a composite signal to the viewer's main viewing device To supply.

In addition, a basic broadcast channel included in up to 32 unscrambled video signals provided in a signal band of 610 to 810 MHz may be supplied to a plurality of viewing devices other than the main viewing device. Therefore, a service provider that provides a video signal can configure various video signal products.

The outdoor LNB / set top box integrated receiving system 110 may give two separate driven addresses to the outdoor LNB / set top box integrated receiving system 110.

In other words, by separately assigning two separate addresses to the outdoor LNB / set-top box integrated receiving system 110, one receiving system 110 may be driven as if the two receiving systems 110 are controlled.

In other words, the service provider can separately control the broadcast signal of the channel 3 or 4 and the broadcast signal of the 610-810MHz band embedded in the outdoor LNB / set-top box integrated receiving system 110, 2 as one receiver It is possible to provide different broadcast services to the viewers.

The outdoor LNB / set-top box integrated receiving system 110 further includes an MMDS / public broadcasting combiner 260 that combines the output of the mixer 250 and the public broadcasting signal (VHF / UHF) and outputs it through one cable 265. can do. Here, the cable 265 is a public hearing broadcast cable.

The MMDS / Public Broadcast Combiner 260 eliminates the inconvenience of using a conventional MMDS wireless CATV viewer to connect a separate receiving antenna and cable to a room in order to separately view public broadcasts such as pole or UHF.

In order to view public hearing and wireless CATV broadcasting, existing viewers use a method of connecting two coaxial cables from each antenna to the room and using a switch.

The MMDS / Public Hearing Combiner 260 combines the output of the Hearing Broadcast Antenna 203 and the output of the Mixer 250 and transmits it over one cable. However, simultaneous output is impossible because the output signal of the mixer 250 and the bandwidth of the hearing broadcast overlap each other.

Therefore, the MMDS / Public Broadcast Combiner 260 uses a FAIL / SAFE type switch capable of remote control. That is, while watching the MMDS broadcast, the public broadcast signal (VHF / UHF) is automatically cut off, and when the MMDS broadcast is not received, the public broadcast signal (VHF / UHF) is automatically connected.

The outdoor LNB / set top box integrated receiving system 110 uses a power source fed from the bias tee 290, 300 in the room connected to the voltage source 270 to the cable 265. In addition, the outdoor LNB / set-top box integrated receiving system 110 may receive a variety of signals adjusted by the viewer using a remote control.

Such an outdoor LNB / set top box integrated receiving system 110 can support multiple broadcasting products of a broadcasting company with only one receiving system, thereby reducing equipment investment and configuring various broadcasting products.

In addition, if there are several video devices in a household, the main video device such as a living room descrambles and connects the video signals transmitted by the provider by scrambling, and the video signals of the home or the children's room are supplied without being scrambled from the beginning. By connecting the receiver, the purchaser of the receiving system can reduce the installation cost and reduce the viewing fee due to the supply of unnecessary channels.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

As described above, the outdoor LNB / set top box integrated receiving system according to the present invention operates one receiving system like two receiving systems by manufacturing the LNB and the set top box as an outdoor integrated type and assigning separate addresses to the LNB and the set top box. There is an advantage to this.

In addition, only one receiving system allows a broadcaster to provide multiple broadcasting products, thereby reducing equipment investment, and configuring various broadcasting products. Since the video signal can be provided separately from the video device, there is an advantage of reducing the installation cost and the viewer fee due to the supply of unnecessary channels.

Claims (9)

Low Noise Blockdown Converter (LBN) for converting and outputting a frequency of an input video signal; A divider for separating and outputting the video signal output from the LNB; A control unit for extracting and demodulating a control channel signal from the video signal output from the splitter and outputting first and second address signals; A descrambling circuit that descrambles the scrambled video signal among the video signals output from the distributor in response to the first address signal and outputs the descrambled video signal; A third band block configured to output an image signal output from the distributor in response to the second address signal; And And a mixer for mixing and outputting an output of the descramble circuit and an output of the third band block. The method of claim 1, wherein the video signal, Outdoor LNB / set-top box integrated receiving system, characterized in that the MMDS (Multichannel Multipoint Distribution Service) signal. The method of claim 1, wherein the control unit, A demodulator for generating a control signal by demodulating the command code of the extracted control channel signal; And And a controller for generating the first address signal and the second address signal in response to the control signal. The method of claim 3, wherein The first address signal includes information necessary for descramble operation of the descramble circuit, and the second address signal turns on or turns off the third band block, The first and second address signal is an outdoor LNB / set-top box integrated receiving system, characterized in that the remote control. The method of claim 1, wherein the descramble circuit, Outdoor LNB / set-top box integrated receiving system, characterized in that for converting the frequency of the scrambled video signal to match the frequency of channel 3 and 4 of the home television. The method of claim 1, wherein the LNB is, Outdoor LNB / set-top box integrated receiving system, characterized in that for converting the frequency of the input video signal to a frequency between 610Mhz to 810Mhz. The method of claim 1, Outdoor LNB / set-top box integrated receiving system characterized in that it further comprises an MMDS / public broadcast combiner for outputting the output of the mixer and the public broadcast signal combined by one cable. The method of claim 7, wherein the cable, Outdoor LNB / set-top box integrated receiving system, characterized in that the cable for public hearing. The method of claim 7, wherein the MMDS / public broadcast combiner, Outdoor LNB / set-top box integrated receiving system characterized in that the remote control FAIL / SAFE type switch.

Images