KR100737079B1 - System and method for controlling a chargable channel selection on the digital broadcasting receiver - Google Patents

Abstract

The present invention relates to an apparatus and method for pay channel selection in a broadcast receiver, and more particularly, to tune and demodulate pay channel broadcasting in a broadcast receiver, extract a PMT in a bit stream of a pay channel broadcast, If the award identification number (CAS_ID) and the control word identification number (CAS_ID) in the PMT coincide, the EMM packet and the ECM packet are obtained from the bit stream of the pay channel broadcast, and the control word (CW), which is an encrypted random number generated value from the EMM packet and the ECM packet, is obtained. ), And then descrambles the bit stream of pay channel broadcast, decodes the descrambled channel broadcast and outputs it. Therefore, the present invention can watch the pay channel broadcast without using a separate CAM or smart card and can easily upgrade the control word identification number of the smart card to generate the control word required for descrambling the pay channel broadcast. .

Pay Channel, Control Word Identification Number, Smart Card

Description

Pay channel tuning device in broadcast receiver and method thereof {SYSTEM AND METHOD FOR CONTROLLING A CHARGABLE CHANNEL SELECTION ON THE DIGITAL BROADCASTING RECEIVER}

1 is a block diagram showing a pay channel tuning device in a broadcast receiver according to the prior art;

2 is a block diagram showing a pay channel tuning device in a broadcast receiver according to the present invention;

3 is a flowchart sequentially illustrating a method of downloading a pay channel tuning control word in a broadcast receiver according to the present invention;

4 is a flowchart sequentially illustrating a pay channel tuning method in a broadcast receiver according to the present invention;

<Description of the code | symbol about the principal part of drawing>

104: satellite broadcast tuner 106: terrestrial broadcast tuner

108, 110: demodulator 112: network connection

114: Demux 116: Micom

118: network connection 120: CAS-ID storage unit

122: controller 124: key input unit

126: memory 128: audio decoder

130: video decoder

The present invention relates to an apparatus and method for pay channel selection in a broadcast receiver, and more particularly, to a broadcast receiver capable of releasing and restricting reception of a pay channel without having a pay channel release module coupled to the broadcast receiver. The present invention relates to a pay channel channel selection apparatus and a method thereof.

A broadcast receiver, which is currently a set-top box, is a receiver that can receive satellite broadcasting, terrestrial broadcasting, cable broadcasting, etc., and receives the received digital broadcasting (video / audio) signal in the form of compressed MPEG-2 TV. Output to a display device.

Broadcasts received by such a broadcast receiver are largely classified into free channel broadcasts and paid channel broadcasts. Currently, pay channel broadcasts are broadcasts scrambled by the following two common interface (CI) and conditional access system (CAS) methods. Descramble to enable viewing.

The first CI method is divided into PCMCIA module, which is a PC card equipped with CAS function to watch pay channel broadcasting. When this module (hereinafter called CAM) is inserted into the CI slot of the digital set-top box, the corresponding CAS function is performed. Represents an interface that can be defined.

The second CAS method is equipped with a reception limiter for pay channel broadcasting inside a digital set-top box that encrypts a specific broadcast so that viewers can watch it at a certain price. That is, a card such as a smart card that decodes a control word, which is a descramble key for decoding subscriber information and an encrypted broadcast signal, and an interface module for inserting the same into a CAS slot. do.

1 is a block diagram showing a pay channel channel selection apparatus in a broadcast receiver according to the prior art.

Referring to FIG. 1, the pay channel tuning apparatus in the conventional broadcast receiver includes the antennas 10 and 12, the satellite and terrestrial broadcast tuners 14 and 16, the demodulators 18 and 20, the network connection unit 22, DE-MUX 24, CAM 26, controller 28, smart cards 30, smart card interface 32, micom 34, key input 36, memory 38 , Audio decoder 40, video decoder 42, and the like.

The satellite broadcast tuner 14 and the terrestrial broadcast tuner 16 receive signals transmitted from the antennas 10 and 12, remove noise, and convert them into frequency bands that can be processed by a broadcast receiver that is a set-top box. Only an arbitrary broadcast channel is selected and amplified from the signals provided from the Low Noise Block converter.

The demodulators 18 and 20 frequency convert a transponder including the corresponding broadcast channel received from the satellite broadcast tuner 14 and the terrestrial broadcast tuner 16 to baseband, and perform quadrature phase shift keying (QPSK). And demodulate the frequency of the original broadcast channel to the DE-MUX 24.

The network connection unit 22 receives the cable broadcast and transmits the channel frequency of the cable broadcast to the DE-MUX 24.

The DE-MUX 24 is an EMM (Entitlement Manage Message) packet that is a paid reception restriction signal in a bit stream of a corresponding broadcast signal when the transmitted satellite broadcast channel, terrestrial broadcast channel, or cable broadcast channel is broadcast of a pay channel. And the encrypted random number generation value from the Entitlement Control Message (ECM) packet to the CAM 26 or the smart card interface 32 through the microcomputer 34 and the controller 28. DE-MUX 24 that receives a control word (CW), which is a random number generated value decoded in the CAM 26 or the smart card interface 32, through the microcomputer 34 and the controller 28. Descrambles the EMM packet and the ECM packet using a control word which is a descramble key, and decodes the stream into the stream of the original broadcast signal.

The CAM 26 communicates with the microcomputer 34 through the controller 28 when the PCMCIA module, which is a PC card equipped with a CAS function capable of watching pay channel broadcasting, is inserted into the CI slot of the broadcast receiver.

The smart card interface 22 communicates with the microcomputer 34 through the controller 28 when the smart cards 30 equipped with the CAS function capable of watching pay channel broadcasting are inserted into the CAS slot.

The microcomputer 34 controls internal components of the broadcast receiver, which is a set-top box, and communicates with the controller 28 to detect whether the CAM 26 / smart card interface 32 is attached or detached. The microcomputer 34 demuxes the bit stream of the tuned broadcast channel by tuning (tuning) any one of satellite channels, terrestrial broadcast, and cable broadcast according to the key signal input from the key input unit 36 (DE-MUX). 24 to control parsing into video, audio, and the like.

The key input unit 36 is a portion for receiving a key signal for operating the broadcast receiver or receiving a remote control signal.

The memory 38 stores information on whether a control word used for descrambling pay channel broadcasting is transmitted in a CI or CAS slot, and stores data necessary for controlling the operation of the microcomputer 34.

The audio decoder 40 decodes the audio stream from the broadcast stream delivered from the DE-MUX 24 using an MPEG decompression algorithm, and then outputs the audio stream to a speaker or an audio amplifier of a television.

The video decoder 42 decodes the video stream from the broadcast stream delivered from the DE-MUX 24 with an MPEG decompression algorithm and then outputs it to a monitor of a television.

The pay channel selecting apparatus in the conventional broadcasting receiver configured as described above is a channel of satellite broadcasting, terrestrial broadcasting, or cable broadcasting received at the satellite broadcasting tuner 14, the terrestrial broadcasting tuner 16, and the network connection unit 22, respectively. In the case of pay channel broadcasting, the control word (CW), which is a random number generation value decoded through the smart card 30 inserted in the CAM 26 or the smart card interface 32, is extracted, and the demux (DE-MUX) ( 24), the EMM packet and the ECM packet in the bit stream of the satellite broadcast, terrestrial broadcast, or cable broadcast channel are descrambled by the first award (CW) and decoded into a stream of the original broadcast signal. The audio stream of the broadcast stream delivered from the DE-MUX 24 is decoded by the MPEG decompression algorithm through the audio decoder 40 and then output to the speaker or audio amplifier of the television. The video stream of the broadcast stream delivered from the DE-MUX 24 is decoded by the MPEG decompression algorithm through the video decoder 42 and then output to the monitor of a television.

However, in the pay channel tuning apparatus in the broadcast receiver according to the prior art, the pay channel can be tuned only when there is a smart card having a different card version according to each region or date.

Therefore, conventional broadcast receivers have many types of smart cards, so users have to upgrade their versions for each type of smart card, and there is a problem in that they cannot watch paid channel broadcasts without a smart card or CAM.

Summary of the Invention An object of the present invention is to solve the above-mentioned problems of the prior art, and to identify a control word of a smart card for generating a control word used for descrambling of a pay channel through a satellite, wired or wireless network in a broadcast receiver. By providing the number (CAS_ID) to download the pay channel broadcasting without using a separate CAM or smart card, and provides a pay channel tuning device in the broadcast receiver that can easily upgrade the control word of each smart card, and a method thereof. have.

In order to achieve the above object, an apparatus of the present invention is a pay channel tuning apparatus in a broadcast receiver for decoding and outputting a bit stream of a received pay channel broadcast into video and audio data, and to tune and demodulate the pay channel broadcast. A tuner and a demodulator, a storage that stores the control word identification number (CAS_ID) of the smart card for descrambling the pay channel broadcast, a PMT (Program Map Table) in the bit stream of the pay channel broadcast, and extracts the smart card If the control word identification number (CAS_ID) and the control word identification number (CAS_ID) in the PMT coincide, the EMM packet and the ECM packet are obtained from the bit stream of the pay channel broadcast, and the control word is a random number generation value encrypted from the EMM packet and the ECM packet. Demux extracts (CW) and descrambles the bit stream of pay channel broadcasting, and The controller selects the control word identification number (CAS_ID) of the smart card corresponding to the control word identification number (CAS_ID) of the PMT in the stream and provides it to the demux, and decodes the channel broadcast descrambled in the demux. And outputting the decoder and the demuxed bit stream demuxed in the pay channel broadcasting, extracting the PMT in the bit stream, extracting the control word identification number (CAS_ID) of the smart card corresponding to the PMT, paying channel broadcasting A microcomputer which controls the process of descrambling the bit stream of the pay channel broadcast by extracting a control word (CW), which is a process of obtaining an EMM packet and an ECM packet from the bit stream of the EMM packet, and an encrypted random number generated value from the EMM packet and the ECM packet. do.

In order to achieve the above object, the method of the present invention is a pay channel selection method in a broadcast receiver for decoding and outputting a bit stream of a received pay channel broadcast into video and audio data, the control word identification of the smart card in the broadcast receiver When a key signal for downloading the number CAS_ID is input, selecting a payment method or performing a payment process and identifying a control word of a smart card through a server of a satellite broadcast channel, a wired or wireless Internet in a broadcast receiver; Determining whether to download the number (CAS_ID); and when the selection key signal for downloading through the satellite broadcasting channel is input, receives the signal of the satellite broadcasting channel including the control word identification number (CAS_ID) of the smart card. Receiving and demodulating the signals, and demuxing the signals of the satellite broadcasting channels. Extracting and storing the control word identification number (CAS_ID) of the card; and when the selection key signal is input to download the control word identification number (CAS_ID) of the smart card from the server of the wired or wireless Internet, The step of connecting to the wired, wireless Internet server in the step, and downloading and storing the control word identification number (CAS_ID) of the smart card from the wired, wireless Internet server.

delete

Hereinafter, with reference to the accompanying drawings, the most preferred embodiment of the present invention will be described in more detail to be easily carried out by those skilled in the art.

2 is a block diagram illustrating a pay channel tuning apparatus in a broadcast receiver according to the present invention.

Referring to FIG. 2, the pay channel tuning apparatus in the broadcast receiver according to the present invention includes an antenna (100, 102), satellite and terrestrial broadcast tuners (104, 106), demodulators (108, 110), network connection unit ( 112, DE-MUX 114, MICOM 116, network connection 118, CAS_ID storage 120, controller 122, key input 124, memory 126, audio decoder 128, video decoder 130, and the like.

The satellite broadcast tuner 104 and the terrestrial broadcast tuner 106 receive signals transmitted from the respective antennas 100 and 102 to remove noise and convert them into frequency bands that can be processed by a broadcast receiver which is a set-top box. Only an arbitrary broadcast channel is selected and amplified from the signals provided from the.

The demodulators 108 and 110 frequency convert the transponder including the corresponding broadcast channel received from the satellite broadcast tuner 104 and the terrestrial broadcast tuner 106 to baseband, and convert the frequency of the original broadcast channel with QPSK. Demodulate and forward to DE-MUX 114.

The network connection unit 112 receives the cable broadcast and transmits the channel frequency of the cable broadcast to the DE-MUX 114.

If the satellite broadcasting channel, the terrestrial broadcasting channel, or the cable broadcasting channel is a free channel broadcasting, the DE-MUX 114 descrambles the bit stream of the corresponding broadcasting signal and decodes it into the original broadcasting signal, and then decodes it into an audio decoder. 128 and video decoder 130.

The DE-MUX 114 of the present invention extracts a PMT value in a bit stream of a corresponding broadcast signal when a satellite broadcast channel, a terrestrial broadcast channel, or a cable broadcast channel is a pay channel broadcast, and extracts the extracted PMT value. The transfer to the microcomputer 116 and the controller 122. The controller 122 receives the control word identification number (CAS_ID) of the smart card, and if the control word identification number (CAS_ID) of the smart card matches the control word identification number (CAS_ID) of the PMT in the bit stream, the EMM packet. And obtaining an ECM packet, extracting a control word (CW) which is an encrypted random number generation value from the EMM packet and the ECM packet, and descrambles the bit stream of the pay channel broadcast using the control word (CW) to stream the original broadcast signal. And decode it to the audio decoder 128 and the video decoder 130.

The microcomputer 116 controls internal components of the broadcast receiver, which is a set-top box, and tunes (tunes) any one broadcast channel among satellite broadcasting, terrestrial broadcasting, and cable broadcasting according to the key signal input from the key input unit 124. The bit stream of the broadcast channel is parsed as video, audio, etc. through the DE-MUX 114.

The microcomputer 116 of the present invention extracts the PMT value in the bit stream of the pay channel broadcast signal when the bit stream of the broadcast channel is a pay channel in the DE-MUX 114, and extracts the extracted PMT value. 116 and control to the controller 122. The controller 122 extracts the control word identification number CAS_ID of the smart card and transmits the control word identification number CAS_ID to the DE-MUX 114. If the award identification number (CAS_ID) and the control word identification number (CAS_ID) of the PMT in the bit stream match, obtaining an EMM packet and an ECM packet, and a control word (CW) which is a random number generated value encrypted in the EMM packet and the ECM packet. Extracting and controlling the process of descrambling the bit stream of pay channel broadcasting using a control word (CW). For example, the control word identification number (CAS_ID) of the smart card indicates that 0X500 is VIACESS1, 0X100 is media guard, 0X604 is irdeto1, 0X1722 is irdeto2, and the like.

In addition, the microcomputer 116 of the present invention, when the key signal for downloading the control word identification number (CAS_ID) of the smart card from the key input unit 124 is input, the satellite broadcast tuner 104, demodulator 108, and the de- The control word identification number CAS_ID of the smart card is downloaded from the signal of the satellite broadcasting channel through the DE-MUX 114 and extracted and stored in the CAS_ID storage unit 120 through the controller 122. Alternatively, the control word identification number CAS_ID of the smart card is downloaded from the server through the network connection unit 118 connected to the wired or wireless Internet, and stored in the CAS_ID storage unit 120.

The network connection unit 118 downloads the control word identification number (CAS_ID) of the smart card which is connected to the wired / wireless Internet and transmitted through the server, and stores the control word identification number (CAS_ID) in the CAS_ID storage unit 120.

The CAS_ID storage unit 120 stores the control word identification number (CAS_ID) of the smart card inserted into the satellite broadcast channel signal or downloaded through the network connection unit 118.

The controller 122 extracts, from the CAS_ID storage unit 120, the control word identification number CAS_ID of the smart card corresponding to the control word identification number CAS_ID in the PMT transmitted from the DE-MUX 114. This is passed to the DE-MUX 114.

The key input unit 124 is a portion for receiving a key signal for operating the broadcast receiver or receiving a remote control signal.

The memory 126 stores control word information used for descrambling pay channel broadcasting, and stores data necessary for controlling the operation of the microcomputer 116.

The audio decoder 128 decodes the audio stream from the broadcast stream delivered from the DE-MUX 114 with an MPEG decompression algorithm, and then outputs the audio stream to a speaker or an audio amplifier of a television.

The video decoder 130 decodes the video stream from the broadcast stream delivered from the DE-MUX 114 with an MPEG decompression algorithm, and then outputs the video stream to a monitor of a television.

The pay channel tuning device in the broadcast receiver according to the present invention configured as described above includes a satellite broadcast tuner 104 when a key signal for downloading the control word identification number CAS_ID of the smart card is input from the key input unit 124. The control word identification number (CAS_ID) of the smart card included in the signal of the satellite broadcasting channel is extracted through the demodulator 108 and the DE-MUX 114, and downloaded to the CAS_ID storage unit 120. Save it. Alternatively, the control word identification number CAS_ID of the smart card is downloaded from the server through the network connection unit 118 connected to the wired or wireless Internet, and stored in the CAS_ID storage unit 120.

If the channel of the satellite broadcast, terrestrial broadcast, or cable broadcast received from the satellite broadcast tuner 104, the terrestrial broadcast tuner 106, and the network connection unit 112 is a pay channel broadcast, the demux 114 is used. Extracts the PMT in the bit stream of the pay channel broadcast signal, and the control word of the smart card that matches the control word identification number (CAS_ID) in the PMT among the identification numbers stored in the CAS_ID storage unit 120 in the controller 122. Extracts the identification number (CAS_ID), and if the control word identification number (CAS_ID) of the smart card and the control word identification number (CAS_ID) in the PMT in the demux (DE_MUX) 114, obtains the EMM packet and ECM packet, After the control word (CW), which is an encrypted random number generation value, is extracted from the EMM packet and the ECM packet, the bit stream of the pay channel broadcast is descrambled using the control word (CW), and then the descrambled pay channel broadcast is audited. And decoding each of the output from the video decoder (128, 130).

3 is a flowchart sequentially illustrating a method of downloading a pay channel selection control word identification number in a broadcast receiver according to the present invention.

2 and 3, the method for downloading the control channel identification number for pay channel selection in the broadcast receiver according to the present invention proceeds as follows.

The microcomputer 116 of the broadcast receiver determines whether a key signal for downloading the control word identification number CAS_ID of the smart card is input from the key input unit 124. (S100)

As a result of the determination of S100, when a key signal for downloading the control word identification number CAS_ID of the smart card is input from the microcomputer 116, the microcomputer 116 selects a payment method or performs a payment process (S102).

The microcomputer 116 determines whether to download the control word identification number CAS_ID of the smart card through the satellite broadcast channel (S104).

As a result of the determination, when the selection key signal for downloading the control word identification number (CAS_ID) of the smart card is input through the satellite broadcasting channel from the key input unit 124, the microcomputer 116, the satellite broadcasting tuner 104 and the demodulator The control unit 110 receives the signal of the satellite broadcasting channel including the control word identification number (CAS_ID) of the smart card and controls it to demodulate it (S106).

The microcomputer 116 demuxes the signal of the satellite broadcast channel received and demodulated through the DE-MUX 114 and extracts the control word identification number CAS_ID of the smart card. (S108 to S110).

The microcomputer 116 stores the extracted control word identification number (CAS_ID) of the smart card in the CAS_ID storage unit 120 through the controller 122. (S112) For example, the control word identification number of the smart card ( CAS_ID) represents 0X500 for VIACESS1, 0X100 for media guard, 0X604 for irdeto1, 0X1722 for irdeto2, and the like.

If the S104 determines that the key input unit 124 receives the selection key signal for downloading the control word identification number (CAS_ID) of the smart card from the wired or wireless Internet server, the microcomputer 116 transmits the data through the network connection unit 118. Connect to a wired or wireless Internet server (S114).

The microcomputer 116 downloads the control word identification number CAS_ID of the smart card from the wired or wireless Internet server and stores it in the CAS_ID storage unit 120 (S116 to S118).

Therefore, the method of downloading the pay channel selection control word in the broadcast receiver according to the present invention, receiving the satellite broadcast channel including the control word identification number (CAS_ID) of the smart card and the control word identification number of the smart card in the received signal Extract the CAS_ID and store the CAS_ID in the CAS_ID storage unit 120 or download the control word identification number CAS_ID of the smart card through the network connection unit 118 connected to the wired or wireless Internet server. ), The control word identification number of the smart card for generating the control word, which is an encrypted random number generation value required for the descrambling of pay channel broadcasting, can be upgraded via satellite or the Internet.

4 is a flowchart sequentially illustrating a pay channel tuning method in a broadcast receiver according to the present invention.

2 and 4, the pay channel selection method in the broadcast receiver according to the present invention proceeds as follows.

First, when a key signal for tuning (tuning) an arbitrary broadcast channel is input from the key input unit 124, the microcomputer 116 is a satellite broadcast tuner 104, a terrestrial broadcast tuner 106, and a network connection unit 112. Receives each satellite broadcast, terrestrial broadcast, or cable broadcast to demodulate it.

The microcomputer 116 demuxes the broadcast channel received through the DE-MUX 114 and determines whether the bit stream of the demuxed broadcast channel is a pay channel (S132 to S134).

As a result of the determination of S134, when the demuxed broadcast channel is a pay channel broadcast signal, the microcomputer 116 extracts the PMT in the bit stream of the broadcast signal through the DE-MUX 114 and delivers it to the controller 122. (S136)

The controller 122 may control the control word identification number (CAS_ID) of the smart card corresponding to the control word identification number (CAS_ID) in the PMT among the control word identification numbers (CAS_ID) of the plurality of smart cards stored in the CAS_ID storage unit 120. Select and pass it to the DE-MUX 114 (S138).

 PMT value structure  Length  value  Index word tag 8  0x09  Index word length 8  CAS ID 16  CAS PID 16  Personal data 8 * length

For example, since the control word identification number (CAS_ID) of the smart card is 0X500 represents VIACESS1, 0X100 represents media guard, 0X604 represents irdeto1, 0X1722 represents irdeto2, and the controller 122 identifies the control word in the PMT as shown in Table 1 below. The control word identification number CAS_ID of the smart card that matches the number CAS_ID is selected (extracted) and transmitted to the demux 114.

The microcomputer 116 controls the demux 114 to obtain an EMM packet and an ECM packet using the control word identification number CAS_ID of the smart card (S140).

The microcomputer 116 extracts the control word CW, which is a random number generation value encrypted by the demux 114, in the EMM packet and the ECM packet, and uses the control word CW extracted the bit stream of the pay channel broadcast. To descramble (S142 to S144).

ECM structure  Length  value  Table id  8  0x80, 0x81  Section syntax indicator 4  Section length 12  Toggle bits One  cryto algo family 7  reserved 8  ECM data 8 * section length

For example, when the DE_MUX 114 receives the EMM packet and ECM packet values in the bit stream, the demux 114 must extract the control word with the values. In the equation for obtaining the control word (function, not shown), the total ECM length is input, and the input data is inputted by inputting 1 + ECM length value. If the return value is 1, it is set to normal. If the return value is 0, it is defined as an error and then set to return to descrambling. If 1 is returned, the data is descrambled normally. If 0 is returned, it is recognized as an error so that the descrambling process cannot be performed.

That is, the present invention selects (extracts) the control word identification number (CAS_ID) of the smart card that matches the PMT value in the pay channel broadcast, and extracts the control word identification number (CAS_ID) of the extracted smart card and the PMT in the bit stream. If the award identification number (CAS_ID) matches, the EMM packet and the ECM packet are extracted, and the extracted EMM packet and the ECM packet are used to generate a control word, which is an encrypted random number, and the bit of the pay channel broadcast using the control word. Descramble the stream.

The microcomputer 116 decodes the descrambled audio stream in the DE-MUX 114 with an MPEG decompression algorithm through the audio decoder 128, and then outputs it to a speaker or an audio amplifier of a television. The descrambled video stream is decoded by the MPEG decompression algorithm through the video decoder 130 and then output to the monitor of the television. (S146 to S148)

As described above, the present invention provides a separate CAM by downloading a control word identification number (CAS_ID) of a smart card for generating a control word used for descrambling of a pay channel through a satellite, wired or wireless network in a broadcast receiver. Alternatively, the pay channel broadcast can be watched without using the smart card, and the control word identification number of the smart card for generating the control word necessary for descrambling the pay channel broadcast can be easily upgraded through satellite or the Internet.

On the other hand, the present invention is not limited to the above-described embodiment, various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims to be described later.

Claims (5)

A pay channel tuning device in a broadcast receiver for decoding and outputting a received bit stream of a pay channel broadcast into video and audio data, A tuner and a demodulator for tuning and demodulating the pay channel broadcast; A storage unit for storing a control word identification number (CAS_ID) of a smart card for descrambling the pay channel broadcast; Extract the PMT in the bit stream of the pay channel broadcast, and if the control word identification number (CAS_ID) of the smart card and the control word identification number (CAS_ID) of the PMT match, EMM packet and ECM in the bit stream of the pay channel broadcast A demux for obtaining a packet and descrambling a bit stream of a pay channel broadcast by extracting a control word (CW) which is an encrypted random number generation value from the EMM packet and the ECM packet; The control unit selects the control word identification number (CAS_ID) of the smart card corresponding to the control word identification number (CAS_ID) of the PMT in the bit stream of the pay channel broadcast extracted from the demux and provides the demux to the demux. With the controller, A decoder for decoding and outputting a channel broadcast descrambled by the demux; Extracting the PMT in the bit stream when the bit stream demuxed in the demux is a pay channel broadcast, extracting a control word identification number (CAS_ID) of the smart card corresponding to the control word identification number (CAS_ID) of the PMT; Obtaining an EMM packet and an ECM packet from the bit stream of the pay channel broadcast; and extracting a control word (CW) that is an encrypted random number generated value from the EMM packet and the ECM packet to decode the bit stream of the pay channel broadcast. Microcomputer to control the process of scrambling Pay channel tuning device in a broadcast receiver comprising a. The method of claim 1, The device, Pay channel selection in the broadcast receiver, characterized in that it further comprises a network connection for downloading the control word identification number (CAS_ID) of the smart card is connected to the wired, wireless Internet and transmitted through the server and stored in the storage unit Device. delete A pay channel tuning method in a broadcast receiver for decoding and outputting a received bit stream of a pay channel broadcast into video and audio data, Selecting a payment method or performing a payment process when a key signal for downloading the control word identification number (CAS_ID) of the smart card is input by the broadcast receiver; Determining, by the broadcast receiver, whether to download a control word identification number (CAS_ID) of a smart card through a server of a satellite broadcast channel or a wired or wireless Internet; Receiving a demodulated signal of the satellite broadcast channel including the control word identification number (CAS_ID) of the smart card when a selection key signal for downloading through the satellite broadcast channel is input as a result of the determination; Demuxing the signal of the satellite broadcasting channel to extract and store the control word identification number (CAS_ID) of the smart card; As a result of the determination, when the selection key signal for downloading the control word identification number (CAS_ID) of the smart card is input from the server of the wired / wireless internet, accessing the wired / wireless internet server from the broadcast receiver; Downloading and storing the control word identification number (CAS_ID) of the smart card from the wired, wireless Internet server Pay channel selection method in a broadcast receiver comprising a. The method of claim 4, wherein The pay channel tuning method comprises the steps of tuning and demodulating pay channel broadcast in the broadcast receiver; Extracting the PMT in the bit stream of the pay channel broadcast; Extracting a control word identification number (CAS_ID) of the smart card that matches the control word identification number (CAS_ID) in the PMT; Obtaining an EMM packet and an ECM packet from the bit stream of the pay channel broadcast when the control word identification number (CAS_ID) and the control word identification number (CAS_ID) of the smart card in the PMT match; Extracting a control word (CW), which is an encrypted random number generation value, from the EMM packet and the ECM packet to descramble a bit stream of a pay channel broadcast; Decoding and outputting the descrambled channel broadcast Pay channel selection method in a broadcast receiver comprising a.

Images