KR20030012667A - System for receiving and transmitting a multi-channel signal, and method for controlling the same - Google Patents

Abstract

PURPOSE: A multichannel transmission/reception system and a method for controlling the same are provided to simultaneously receive multiple satellite broadcasting signals scrambled in common interface mode even at a remote site. CONSTITUTION: A multichannel transmission/reception system includes a satellite broadcast receiving set(170) and a plurality of remote receiving sets(200). The satellite broadcast receiving set receives a scrambled or unscrambled digital satellite broadcasting signal, demultiplexes and demodulates the signal to output audio/video signals through a predetermined wired line and output audio/video signals through a predetermined wireless channel. The plurality of remote receiving sets demodulates the audio/video signals, transmitted from the satellite broadcast receiving in radio, to output the video signal to a predetermined display and output the audio signal to a predetermine speaker.

Description

System for receiving and transmitting a multi-channel signal, and method for controlling the same

The present invention relates to a multi-channel transmission and reception system and a method thereof, and more particularly, to multi-channel receiving a scrambled channel simultaneously in a common interface (CI) method in a digital satellite broadcasting receiver. It relates to a channel transmission and reception system and a method thereof.

Most current digital satellite broadcast systems follow the Moving Picture Experts Group (MPEG) standard. MPEG-2, the MPEG standard for broadcasting, is defined in the international standards ISO / IEC 13818-1 to 3, which are ISO / IEC 13818-1 (system standard), ISO / IEC 13818-2 (video standard), and ISO / IEC 13818-3 (audio standard). Here, the system standard is a regulation on a transport stream packet which is a time multiplexed signal sequence.

The transport stream TS is a signal composed of 188 bytes, and this signal can be largely divided into a header part and a payload part. In this case, the header portion includes information indicating the start of a signal and a packet identifier (PID) number indicating which signal is contained in the payload portion, and the payload portion includes image information to be transmitted, Voice information or additional information is included.

In this case, the PID number provides a means for demultiplexing a time multiplexed signal. The PID number can identify whether the current packet is a video packet, an audio packet, or an additional information packet.

As described above, general digital satellite broadcasting can be broadly classified into free broadcasting and pay broadcasting.

In order to receive free broadcasts of multiple digital satellite broadcasts at the same time, it is necessary to install multiple tuners and multiple MPEG demultiplexers / decoders (DEMUX / DECODER), but it is not easy to receive paid broadcasts of multiple digital satellite broadcasts simultaneously. There is a problem.

Accordingly, the present invention has been made in an effort to solve the conventional problems, and an object of the present invention is to simultaneously receive multiple satellite broadcast signals scrambled by a common interface (CI) method in a digital satellite broadcast receiver at a remote location. It is to provide a multi-channel transmission and reception system.

Another object of the present invention is to provide a control method of the multi-channel transmission and reception system.

1 is a view for explaining a multi-channel receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the common interface controller of FIG. 1 in detail.

3 is a view for explaining a dual channel receiving apparatus according to an embodiment of the present invention.

4 is a flowchart illustrating a multi-channel receiving method according to an embodiment of the present invention.

5 is a view for explaining a multi-channel transmission and reception system according to another embodiment of the present invention.

FIG. 6 is a view for explaining the above-described example of FIG. 5 in more detail.

<Description of the symbols for the main parts of the drawings>

110: signal receiver 112, 114: tuner / channel demodulator

120: descrambling unit 122, 124: PCMCIA socket

130: common interface controller 132: TS interface unit

134: host interface unit 136: I ² C interface unit

140: host CPU 150: signal output unit

160: switching unit 170: main broadcast receiving set

180: wireless transmission unit 200: remote reception set

210: wireless receiver 220: remote broadcast receiving set

230: remote control unit (RF RCU)

152, 154: Demultiplexer / MPEG Decoder / Analog Encoder

In accordance with one aspect of the present invention, a multi-channel transmission / reception system is provided with a scrambled or unscrambled digital satellite broadcast signal, and demultiplexed and demodulated thereto to provide an audio / video signal through a predetermined wire line. A satellite broadcast receiving set for outputting and outputting an audio / video signal through a predetermined wireless channel; And

Demodulating the audio / video signal wirelessly transmitted from the satellite broadcast receiving set and outputting the video signal to a predetermined display means, wherein the audio signal comprises a plurality of remote reception sets for outputting to a predetermined speaker. Here, it is preferable that the remote reception set further includes a remote control device for requesting transmission of the audio / video signal.

The satellite broadcast receiving set may include a signal receiver configured to receive and output one or more digital satellite broadcast signals via one or more antennas; A descrambling unit having means for descrambling the scrambled digital satellite broadcast signal; A signal output unit outputting an audio / video signal by demultiplexing and demodulating the digital satellite broadcasting signal; A wireless transmitter for wirelessly transmitting the A / V signal output through the A / V switch to the remote reception set; And checking whether the satellite broadcast signal provided from the signal receiver is paid (i) bypasses the signal output unit in the case of a free broadcast signal, and (ii) descrambles the payload signal in the descrambling unit. It is preferable to include a common interface controller for requesting scrambling and outputting the descrambled satellite broadcast signal provided in response to the signal output unit.

Preferably, the apparatus further includes a host CPU controlling the signal receiving unit, the common interface controller, and the signal output unit.

At this time, it is preferable to further include an A / V switch for setting the output path of the audio / video signal output from the signal output unit under the control of the host CPU.

In addition, according to another aspect of the present invention, there is provided a control method of a multi-channel transmission / reception system, which receives an scrambled or unscrambled digital satellite broadcast signal and demultiplexes and demodulates the audio / video signal. In the control method of the satellite broadcast signal receiver to output,

(a) selecting one or more receiving channels of a digital satellite broadcast signal in response to driving of the receiver;

(b) checking whether one of the broadcast signals selected in step (a) is received, outputting a no-signal warning message if the broadcast signal is not received, and if the broadcast signal is received, Checking whether the broadcast signal is paid;

(c) when any one of the broadcast signals received in step (b) is checked as a free broadcast signal, demultiplexing and decoding the corresponding broadcast signal and outputting the broadcast signal to a broadcast receiving set side connected through a predetermined wire line;

(d) when any one of the broadcast signals received in step (b) is checked as a pay broadcast signal, descrambles the corresponding broadcast signal using a first descrambling means, demultiplexes the descrambled broadcast signal, and Decoding and outputting to a broadcast receiving set side connected through a predetermined wire line;

(e) checking whether a radio broadcast signal is requested to be received from at least one remote reception set located at a remote location;

(f) checking, if there is a radio reception request in step (e), whether a corresponding reception request signal is currently being output;

(g) checking whether the broadcast channel is currently being output in step (f), whether it is free or free, and converting to a wireless channel in the case of a free channel and transmitting it to the remote receiving set;

(h) checking whether there is a second descrambling means for descrambling the corresponding broadcast signal in the case of the pay channel in step (g), and if not present, transmitting an absence message of the descrambling means; And

(i) if the second descrambling means is present in the step (h), secondly descrambles the corresponding broadcast signal, demultiplexes and decodes the descrambled broadcast signal, and converts the radio signal into a wireless channel; It comprises the step of sending to the side.

According to such a multi-channel transmission and reception system and a control method thereof, by designing a common interface controller for simultaneously receiving a plurality of channels adopting the CI standard among scramble methods for pay broadcasting, a plurality of display apparatuses can be simultaneously connected using one set-top box. You can receive free / free broadcasting of different digital satellite broadcasting channels, and you can watch multiple free / free broadcasting through one display device using one set-top box, and through one set-top box at a remote place. You can be provided with paid and free broadcasts.

Then, embodiments will be described so that those skilled in the art can easily implement the present invention.

1 is a view for explaining a multi-channel receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a multi-channel receiving apparatus according to an exemplary embodiment of the present invention may include a signal receiver 110, a descrambling unit 120, a common interface controller 130, a host CPU 140, and a signal output unit 150. ).

The signal receiver 110 includes a plurality of tuners, receives a plurality of digital satellite broadcast signals through an antenna connected to each tuner, and outputs the plurality of digital satellite broadcast signals to the common interface controller 130.

The descrambling unit 120 includes a plurality of descramblers, that is, a plurality of CI modules 122, 124,..., And 12n, and the scrambling processed satellite is input via the common interface controller 130. The broadcast signal is descrambled, and the descrambled digital satellite broadcast signal is output to the common interface controller 130. Here, the digital satellite broadcasting signal may be scrambled and input through various methods such as Viaccess, Conax, Cryptwork, Irdeto, and Nagravision.

The common interface controller 130 checks the property of the digital satellite broadcast signal provided from the signal receiver 110 and outputs the bypass signal to the signal output unit 150 when it is checked as a free broadcast signal, and checks the pay broadcast signal. In this case, the descrambling unit 120 is output to the descrambling unit 120, and receives the descrambled digital satellite broadcast signal fed back from the descrambling unit 120 and outputs the descrambled digital satellite broadcast signal to the signal output unit 150.

The host CPU 140 controls the signal receiver 110, the common interface controller 130, and the signal output unit 150. More specifically, the host CPU 140 controls the common interface controller 130 according to the driving of the multi-channel receiver of the digital satellite broadcaster. ) Is reset and initialized, and when the state of each CI module of the descrambling unit 120 is transmitted from the common interface controller 130 to the host CPU 140 according to the checked signal, the host CPU 140 descrambles the descrambling unit. Initialize each CI module of 120.

At this time, the host CPU 140 determines each CI module and checks what kind of CI module is used. Here, the reason for checking which kind of CI module is used is to use one CI module for another satellite broadcast signal when one CI module is used.

The signal output unit 150 demultiplexes and demodulates the free broadcast type satellite broadcast signal or the descrambled satellite broadcast signal provided from the common interface controller 140, and respectively performs A / V signals A1 and V1 (A2, Outputs V2), ..., (An, Vn).

FIG. 2 is a diagram for explaining the common interface controller of FIG. 1 in detail.

Referring to FIG. 2, the common interface controller 130 according to the present invention includes a TS interface unit 132, a host interface unit 134, and an I ² C interface unit 136.

The TS interface unit 132 receives n TS signals from the signal receiving unit 110, exchanges TS with m CI modules, and outputs n TS signals to the signal output unit 150. Here, TS_IN_1 (TS_OUT_1), TS_IN_2 (TS_OUT_2), ...., and TS_IN_n (TS_OUT_n) and TS_IN_M1 (TS_OUT_M1), TS_IN_M2 (TS_OUT_M2), ...., and TS_IN_Mm (TS_OUT_Mm) are matrix structures. And any TS output, and each connection is controlled by the host CPU 140 with an I ² C line. If the TS_IN_n output from the signal receiver 110 is a free broadcast signal instead of a scrambled signal, the TS_IN_n is directly output to the signal output terminal 150.

The host interface unit 134 is located between the host CPU 140 and the CI modules 122, 124, ..., 12n to control each CI module 122, 124, ..., 12n. The control signal 141 connected to the host CPU 140 becomes a signal such as RESET, CE (CHIP ENABLE), RD (READ), WR (WRITE), WAIT / ACK, INT (INTERRUPT). In addition, a signal output from the host interface unit 134 and connected to the descrambling unit 120 may be largely divided into a signal connected to each module to control each module and a signal connected to the entire module and controlling the entire module. .

More specifically, the signals for controlling each module are signals to be controlled for each individual module such as RESET, CD (CARD DETECT), CE (CARD ENABLE), READY / ACK, WAIT, and the like. In addition, signals that control the entire module are signals such as OE (OUTPUT ENABLE), WE (WRITE ENABLE), READ, WRITE.

Another function of the host interface 134 is a buffer control function of the address / data bus. At this time, the address / data bus is directly connected to the entire module in the host CPU 140. A controllable buffer is used for each bus line. In addition, since the address / data bus is shared with the bus between the host CPU 140 and the memory, a buffer is used so that the data of the module and the data of the memory are not mixed. The host interface 134 controls on / off of this buffer.

The I ² C interface unit 136 is driven according to one or more output signals TS_OUT_1, TS_OUT_2,..., TS_OUT_n that are output from the TS interface unit 132 and input to the signal output unit 150. 132 controls the driving of the host interface 134, respectively.

3 is a view for explaining a dual channel receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 3, a dual channel receiver according to an embodiment of the present invention includes first and second tuner / channel demodulators 112 and 114, a common interface controller 130, and first and second demultiplexers. / MPEG decoder / analog encoder 152, 154, and the first and second PCMCIA sockets 122, 124, including a multi-scrambled satellite via a common interface (CI; A receiver capable of receiving and outputting broadcast signals.

The first and second tuner / channel demodulators 112 and 114 each receive different satellite broadcast signals through an antenna and output each received TS to the common interface controller 700. Until this time, the TS is in an undescrambled state, and each tuner / channel demodulator 112 and 114 is controlled by the host CPU 155 built in the first demultiplexer / MPEG decoder / analog encoder 154.

When the host CPU 155 initializes the common interface controller 130, it initializes a conditional access module (CAM) (not shown) inserted into the first and second PCMCIA sockets 122 and 124. do. First, when the common interface controller 130 is initialized, the second demultiplexer / MPEG receives the first input signal TS_IN_1 that is locked among the channels input from the first and second tuner / channel demodulators 112 and 114. Bypass output is performed in the form of a first output signal TS_OUT_1 to the decoder / analog encoder 154.

The host CPU 155 checks whether the TS is a free or paid broadcast, and if it is a free broadcast, encodes the TS into an analog signal through an MPEG2 decoder and outputs video and audio signals.

In addition, as a result of analyzing the TS, if it is a pay broadcast, it checks which type of scramble method and gives a command to the common interface controller 130 to connect the input / output terminals (TS_IN / OUT) of the corresponding CAM, and the common interface controller 130 After inputting TS to the corresponding CAM using the matrix switch, the descrambled feedback signal is output to the demultiplexer (DEMUX). It then encodes the analog signal via an MPEG2 decoder and outputs video and audio signals.

In order to simultaneously receive the scrambled broadcast signals of the two channels in the same manner as described above, and to output the independent video / audio outputs by descrambling, the common interface controller 130 must drive the matrix switch as follows.

That is, the common interface controller 130 receives the first and second input signals TS_IN_1 and TS_IN_2 output from the first and second tuner / channel demodulators 112 and 114 to receive any one of them. One PCMCIA socket 122, and the other signal to the second PCMCIA socket 124 to be applied.

The common interface controller 130 is also a first and second station when the first and second input signals TS_IN_1 and TS_IN_2 output from the first and second tuner / channel demodulators 112 and 114 are free. Bypass outputs to the neutralizer / MPEG decoder / analog encoders 152 and 154, respectively.

Next, various examples in which two satellite broadcast signals are simultaneously input and output through the antenna will be described.

First, when only one TP source (only using TS_IN_1) is used, when the common interface controller 130 initializes, the host CPU 155 outputs the first input signal TS_IN_1 output from the first tuner / channel demodulator 112. Analyze it to see if it is free or paid. If the broadcast is free, the TS outputs the first audio / video A1 / V1 via the first demultiplexer / MPEG decoder / analog encoder 154.

In addition, as a result of analyzing the TS, if it is a pay broadcast, it checks the method of scramble and gives a command to the common interface controller 130 to connect the input / output terminal of the corresponding CI module, that is, the PCMCIA socket, and the common interface controller 130 Connect the matrix switch. When the channel is changed and receives a different scrambled broadcast, the host CPU 155 checks which type of scramble, and again informs the common interface controller 130 which CI module, that is, the PCMCIA socket, to use the common interface controller 130. Does this.

In the case of using multiple TP sources, the basic operation is the same as that of using only one TP source. However, there are some things to consider when receiving multiple TPs that are scrambled in the same way.

For example, the signals output from the first and second tuner / channel demodulators 112 and 114, that is, the first and second input signals TS_IN_1 and TS_IN_2 are scrambled TS in the same manner. If two CI modules of this type, that is, PCMCIA sockets are used, the host CPU 155 allocates one to each TS input. In this case, the TS of the same scramble method can also be viewed.

However, if there is only one PCMCIA socket, the host CPU 155 outputs an elapsed message since the first input signal TS_IN_1 is allocated thereto and there is no PCMCIA socket to be allocated to the second input signal TS_IN_2.

Hereinafter, the signal flow of the multi-channel receiving apparatus according to the present invention will be described in more detail.

When power is supplied to the digital satellite broadcasting receiving system, it checks whether one of the two channel demodulators is locked and then checks whether it is free broadcasting. If it is free broadcasting, it does not go through the CI module, that is, PCMCIA socket. After outputting to the demultiplexer (DEMUX), MPEG-2 decoding processing and analog encoding are performed, and finally video audio is output.

In addition, if the pay broadcast is scrambled pay broadcast, after confirming whether the CAM is inserted into the PCMCIA socket, if the same CAM pay scrambled broadcast is authorized. After descrambling, it is output to the demultiplexer (DEMUX). At this time, if the same type of CAM is inserted in the PCMCIA socket, the output of the PCMCIA socket is applied to another PCMCIA socket, and then output to the demultiplexer (DEMUX), followed by MPEG2 decoding processing and analog encoding, and then video and audio signals are output.

If the first PCMCIA socket 122 is a different CAM from the scrambled broadcast scheme or if the same CAM and CAM are not inserted, the first PCMCIA socket 122 is applied to the second PCMCIA socket 124. At this time, the scrambled pay broadcast signal is applied only when the CAM inserted in the first PCMCIA socket 122 is a CAM of the same type as the scrambled pay broadcast.

If this is not the case, since there is no CAM in the first and second PCMCIA sockets 112 and 114, or there is no suitable smart card even if there is the same CAM, a warning message is displayed.

If another channel receiver is selected, it checks whether the channel is locked in the same way as above and then checks whether it is a free broadcast. If it is a free broadcast, it outputs to the demultiplexer without going through the PCMCIA socket for descrambling the broadcast signal. The channel must be output to a demultiplexer that is not in use.

In the case of pay broadcast, pay broadcast signal scrambled with a CI module not used by another channel should be applied. In this case, a CAM of the same type as a scrambled broadcast signal should be inserted into a CI module slot not used. If there is no other channel signal, it is controlled in the same manner as the processing flow of the above channel signal.

The processing method of the common interface controller will be described in more detail with reference to Table 1 below.

CI input＼CI output TS_OUT_1 TS_OUT_2 Free broadcast TS_IN_1 CI bypass TS_IN_2 CI bypass For TS_IN_1paid broadcast CI Module A (910) / CI Module B (920) / CI Module A (910) to B (920) / TS_IN_2 Bypass CI Module A (910) / CI Module B (920) / TS_IN_2 Bypass If TS_IN_2 is paid CI Module A (910) / CI Module B (920) / CI Module A (910) to B (920) / TS_IN_1 Bypass CI Module A (910) / CI Module B (920) / TS_IN_1 Bypass Paid both TS_IN_1 and TS_IN_2 CI Module A (910) / CI Module B (920) / CI Module A (910) to B (920) CI module A (910) / CI module B (920) /

Here, each output cannot select the same input at the same time, but is connected to only one input stage.

As shown in Table 1, when the first and second input signals TS_IN_1 and TS_IN_2 are free broadcasts, the common interface controller 130 receives the first input signals inputted from the respective channel units 610 and 620. The TS_IN_1 and the second input signal TS_IN_2 are bypassed without passing through the CI modules 910 and 920, and may be connected to the first and second output signals TS_OUT_1 and TS_OUT_2. You cannot connect both inputs to only one output at the same time.

In addition, as shown in Table 1, when the first input signal TS_IN_1 is a pay broadcast, since the second input signal TS_IN_2 is a free broadcast or there is no signal, the second input signal TS_IN_2 is Output the path.

The first and second output signals TS_OUT_1 and TS_OUT_2 may be output from the first input signal TS_IN_1. The connection depends on the CAM inserted in the CI module. That is, if the CAM of the same type as the pay broadcast of the first input signal TS_IN_1 is inserted into the first CI module (PCMCIA socket 910), the first CI module descrambles the first or second output path TS_OUT_1. Or TS_OUT_2) to export the output.

In this case, when the CAM is inserted into both the first and second CI modules (PCMCIA sockets 910 and 920), the output of the first CI module PCMCIA socket 910 may be applied to the second PCMCIA socket 920. .

In addition, as shown in Table 1, when the second input signal TS_IN_2 is a pay broadcast, the first input signal TS_IN_1 is the same as the pay broadcast and may be replaced by TS_IN_2 instead of TS_IN_1.

In addition, as shown in Table 1, when both of the first and second input signals TS_IN_1 and TS_IN_2 are paid broadcasts, the first and second input signals TS_IN_1 and TS_IN_2 are applied to slots having the same CAM as the paid broadcasts of the first input signal TS_IN_1, If the input signal TS_IN_2 is applied to the slot with the same CAM as the paid broadcast, and the first output TS_OUT_1 is determined by the host CPU 812 in the CI module A or B, the second output TS_OUT_2 is the other CI. It is connected to the module output. When the scrambled pay broadcast is in a different way and the CAM of the CI module is the same, if one of the scrambled pay broadcasts is the same as the common CAM method, the scrambled pay broadcast is first applied to the CI module A, and then the CI is again applied. Apply to module B and send it to output. At this time, the host CPU determines whether the output becomes the first output, TS_OUT_1 or the second output TS_OUT_2.

4 is a flowchart illustrating a multi-channel receiving method according to an embodiment of the present invention.

Referring to FIG. 4, first, it is checked whether a channel is selected (step S100), and when a first channel is selected, it is checked whether a first channel signal is received (step S200). If the first channel is not received in step S200, a no signal warning message indicating that there is no signal is displayed (step S210). In addition, when the first channel is received in step S200, it is checked whether free broadcasting is performed (step S220). If it is checked as free broadcasting, the CI is bypassed and output to the first or second demodulator (step S230).

If it is checked in step S220 that the pay broadcast is checked (step S240), the presence of the first PCMCIA socket is checked, and if it is checked that the first PCMCIA socket exists, the first channel information is transmitted to the first PCMCIA socket and descrambled. If there is the same CAM in the first or second demodulator or the second PCMCIA, it is transmitted to the second CI module (step S250).

If the first PCMCIA socket does not exist in step S240 (step S260), it is checked whether the second PCMCIA socket exists, and if it is checked that the second PCMCIA socket exists, the first channel information is transmitted to the second PCMCIA socket. After descrambling, the output signal is output to the first or second demodulator (step S270). In addition, when it is checked in step S260 that the second PCMCIA socket does not exist, an absence message of a smart card suitable for pay broadcasting is displayed (step S280).

If the second channel is selected in step S100, it is checked whether a second channel signal is received (step S300). When the second channel is not received in step S300, a no signal warning message indicating that there is no signal is displayed (step S210). In addition, when the first channel is received in step S300, it is checked whether it is free broadcasting (step S310). If it is checked as free broadcasting, the CI is bypassed and output to the unconnected first or second demodulator (step S320). .

If it is checked in step S310 that the pay broadcast is checked (step S330), the presence of the first PCMCIA socket is checked, and if it is checked that the first PCMCIA socket exists, the first channel information is transmitted to the first PCMCIA socket and descrambled. If there is the same CAM in the first or second demodulator or the second PCMCIA, it is transmitted to the second CI module (step S340).

If the first PCMCIA socket does not exist in step S330 (step S350), the presence of the second PCMCIA socket is checked (step S350), and if it is checked that the second PCMCIA socket does not exist, the absence message of the smart card suitable for pay broadcasting is sent. Display (step S360). If it is checked in step S350 that the second PCMCIA socket is present, the first channel information is transmitted to the second PCMCIA socket, descrambled, and then output to the first or second demodulator (step S370).

5 is a view for explaining a multi-channel transmission and reception system according to another embodiment of the present invention.

Referring to FIG. 5, the multi-channel transmission / reception system according to another embodiment of the present invention receives a digital satellite broadcast signal and provides the digital satellite broadcast signal to a main reception set through a wired line connected through one end, and provides a digital satellite broadcast signal through the other end. A main set-top box 100 for converting and transmitting a wireless channel and a remote receiving set 200 for receiving the wireless channel-converted digital satellite broadcast signal and outputting A / V.

The main set-top box 100 includes a signal receiver 110, a descrambling unit 120, a common interface controller 130, a host CPU 140, a signal output unit 150, a switching unit 160, and a main broadcast reception set. Reference numerals are given to the components mentioned in FIG. 1 including the 170 and the wireless transmitter 180, and detailed description thereof will be omitted.

The switching unit 160 controls the demultiplexed and demodulated audio / video signals A1 / V1, A2 / V2, ... An / Vn provided from the signal output unit 150 under the control of the host CPU 140. The output path is set and provided to the main broadcast receiving set 170 or the wireless transmitter 180.

The main broadcast receiving set 170 receives and outputs a demultiplexed and demodulated audio / video signal input through the switching unit 160 connected to a predetermined wired line.

The wireless transmitter 180 converts the demultiplexed and demodulated audio / video signal input according to the setting of the output path of the switching unit 160 into a wireless channel, and converts the wirelessly converted audio / video signal into the remote reception set 200. I send it to the side. In this case, the wireless transmitter 180 may FM-modulate the audio / video signal and output the 2.4-GHz band.

The remote reception set 200 includes a wireless reception unit 210, a remote broadcast reception set 220, and a remote control unit (RF RCU) 230 to receive a broadcast signal wirelessly transmitted from the main set-top box 100, The signal is demodulated, restored and output to the A / V signal, and a signal according to a channel switching request according to a user's operation is provided to the main set-top box 100.

The remote controller 230 may provide a channel setting request to the host CPU 140 of the main set-top box 100 under the control of the remote user. Of course, the channel setting request signal to the host CPU 140 may be provided to the host CPU 140 through a predetermined demodulator (not shown).

As described above, according to another embodiment of the present invention, a plurality of satellite broadcast signals may be received through one satellite broadcast set-top box, and the received satellite broadcast signals may be provided through a plurality of output devices.

FIG. 6 is a view for explaining the example of FIG. 5 in more detail, and one main broadcast reception set and one remote broadcast reception set will be described as examples.

Referring to FIG. 6, in the case of free broadcasting, the A / V switching stage 160 outputs according to whether each viewer selects a channel.

Remote channel selection using a wireless control the RF RCU (230), the signal flying in the 433.92MHz frequency is passed through the decoder 142, the host CPU built in the second demultiplexer / MPEG decoder (154) Recognizing and giving a command to the second demultiplexer / MPEG decoder 154 to output the data of the desired channel.

If a viewer of the first TV 170 connected through a wired line wants a channel being watched, the CPU built in the second demultiplexer / MP decoder 154 may give a command to the A / V switch 160. The A1 / V1 output data output to the TV 170 can be simultaneously exported to the wireless transmitter 182.

The first TV (170) side to give a command to confirm whether the desired channel CAM CI, if not, a warning message appears, the same pay-TV or other simultaneously on the first TV 170 or the second TV (220) In case of paying broadcasting, there should be two CAM of PCM CIA socket suitable for each channel.

As in the case of the free broadcast, when the second TV 220 desires the channel being viewed on the first TV 170, the CPU, which is commanded differently from the case of the free broadcast, may view the channel information viewed on the first TV 170. It recognizes and commands the second tuner to find the corresponding TP, and reads whether the CAM is through the CI.

At this time, if a CAM corresponding to the TP exists, the TP is descrambled to output A2 / V2 to the wireless transmitter 182 through the demultiplexer / empe decoder 152 and the A / V switch 160. As a result, data of the same channel is output as independent signals through the demultiplexer / emp decoders 152 and 154 through different tuners.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

As described above, according to an embodiment of the present invention, a common interface controller for simultaneously receiving a plurality of channels adopting the common interface (CI) standard among the scramble methods for paying broadcasting of digital satellite broadcasting is designed. The set top box may be used to receive free / paid broadcasts of different channels through multiple display devices at the same time.

In addition, according to an embodiment of the present invention, by using a set-top box having a common interface controller for receiving a plurality of channels at the same time, a plurality of channels may be used through a picture in picture (PIP) method in one display device. Can watch free broadcast.

In addition, according to another embodiment of the present invention, by transmitting the A / V signals from the common interface method and the multi decoder through the RF module and antenna mounted on the set-top box to the wireless receiver in the place where the user wants to watch, To compensate for the shortcomings of the wired display, multiple channels with scrambled channels can be simultaneously viewed on multiple display devices in different places.

Claims (6)

A satellite broadcast receiving set that receives a scrambled or unscrambled digital satellite broadcast signal, demultiplexes and demodulates it, outputs an audio / video signal through a predetermined wire line, and outputs an audio / video signal through a predetermined wireless channel. ; And Demodulating audio / video signals wirelessly transmitted from the satellite broadcasting set and outputting the video signal to a predetermined display means, and outputting the audio signal to a predetermined speaker; Multi-channel transmission and reception system comprising a. The method of claim 1, wherein the remote receive set, And a remote control device for requesting transmission of the audio / video signal. The method of claim 1, wherein the satellite broadcast reception set, A signal receiver configured to receive and output one or more digital satellite broadcast signals via one or more antennas; A descrambling unit having means for descrambling the scrambled digital satellite broadcast signal; A signal output unit outputting an audio / video signal by demultiplexing and demodulating the digital satellite broadcasting signal; A wireless transmitter for wirelessly transmitting the A / V signal output through the A / V switch to the remote reception set; And Check whether the satellite broadcast signal provided from the signal receiver is paid or not, (i) bypass the signal output unit in the case of a free broadcast signal, and (ii) descramble the descrambling unit in the case of a paid broadcast signal. And a common interface controller for outputting the descrambled satellite broadcast signal provided to the signal output unit according to the response thereof. Multi-channel transmission and reception system comprising a. 4. The multi-channel transmission / reception system according to claim 3, further comprising a host CPU controlling the signal receiver, the common interface controller, and the signal output unit. The multi-channel transmission / reception system according to claim 4, further comprising a switch for setting an output path of an audio / video signal output from the signal output unit under control of the host CPU. A control method of a satellite broadcast signal receiver for receiving a scrambled or unscrambled digital satellite broadcast signal and demultiplexing and demodulating the same to output an audio / video signal. (a) selecting one or more receiving channels of a digital satellite broadcast signal in response to driving of the receiver; (b) checking whether one of the broadcast signals selected in step (a) is received, outputting a no-signal warning message if the broadcast signal is not received, and if the broadcast signal is received, Checking whether the broadcast signal is paid; (c) when any one of the broadcast signals received in step (b) is checked as a free broadcast signal, demultiplexing and decoding the corresponding broadcast signal and outputting the broadcast signal to a broadcast receiving set side connected through a predetermined wire line; (d) when any one of the broadcast signals received in step (b) is checked as a pay broadcast signal, descrambles the corresponding broadcast signal using a first descrambling means, demultiplexes the descrambled broadcast signal, and Decoding and outputting to a broadcast receiving set side connected through a predetermined wire line; (e) checking whether a radio broadcast signal is requested to be received from at least one remote reception set located at a remote location; (f) checking, if there is a radio reception request in step (e), whether a corresponding reception request signal is currently being output; (g) checking whether the broadcast channel is currently being output in step (f), whether it is free or free, and converting to a wireless channel in the case of a free channel, and transmitting it to the remote receiving set; (h) checking whether there is a second descrambling means for descrambling the corresponding broadcast signal in the case of the pay channel in step (g), and if not present, transmitting an absence message of the descrambling means; And (i) if the second descrambling means is present in the step (h), secondly descrambles the corresponding broadcast signal, demultiplexes and decodes the descrambled broadcast signal, and converts the radio signal into a wireless channel; Sending out to the side Control method of a multi-channel receiving apparatus comprising a.