KR100737099B1 - System and method for controlling a chargable channel selection by detecting error on the broadcasting receiver - Google Patents

Abstract

The present invention relates to a pay channel reception limiting device and a control method for error detection in a broadcast receiver. In particular, when a transport channel of a received channel broadcast is a pay channel, it is determined whether an error is detected in the transport channel of the pay channel, If an error is detected in the transport stream, error correction of the transport stream is performed, and the pay-per-view (PPV) time count is stopped, and if the error is not detected in the transport channel of the pay channel, the transport stream of the pay channel broadcast is decoded. Scramble and decode. Therefore, the present invention stops the PPV time count while an error is detected in the transport stream of the received pay channel broadcast, and uses a CAM or a smart card as the transport stream of the pay channel if no error is detected in the transport stream of the pay channel. By outputting the data after descrambling, it is possible to reduce the viewing fee by pausing the PPV time count when an error occurs that degrades the quality of pay channel broadcasting due to an external environment.

Broadcast receiver, pay channel, PPV, error

Description

Restriction and control method for pay channel reception for error detection in broadcast receivers {SYSTEM AND METHOD FOR CONTROLLING A CHARGABLE CHANNEL SELECTION BY DETECTING ERROR ON THE BROADCASTING RECEIVER}

1 is a block diagram showing a pay channel reception limiting device in a broadcast receiver according to the prior art,

2 is a block diagram showing a pay channel reception limiting device for error detection in a broadcast receiver according to the present invention;

3 is a flowchart sequentially illustrating a control method of a pay channel reception limiting device for error detection in a broadcast receiver according to the present invention;

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

100, 102: antenna 104: satellite tuner

106: terrestrial broadcast tuner 108, 110: demodulator

112: network connection 114: demux

116: CAM 118: controller

120: smart card 122: smart card interface

124: microcomputer 126: error detection unit

128: key input unit 130: memory

132: display unit 134: audio decoder

136: video decoder

The present invention relates to a pay channel reception limiting device and a control method in a broadcast receiver, and more particularly, error detection in a broadcast receiver that can reduce the count rate of the inability to view pay channel broadcasting due to weather, tunnels, obstacles, etc. The present invention relates to a paid channel reception limiting device and a control method.

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 is defined to be.

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 (CW), 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. It includes.

1 is a block diagram illustrating a pay channel reception limiting device in a broadcast receiver according to the prior art. The pay channel reception limiting device in a conventional broadcast receiver includes an antenna 10 and 12, a satellite broadcast and a terrestrial broadcast tuner 14; 16, demodulators 18, 20, network connections 22, DE-MUX 24, CAM 26, controller 28, smart cards 30, smart card interface 32 ), A microcomputer 34, a key input unit 36, a memory 38, an audio decoder 40, a video decoder 42, and the like.

The pay channel reception limiting device in the broadcast receiver of the related art configured as described above includes a satellite broadcast, terrestrial broadcast, or cable broadcast received from the satellite broadcast tuner 14, the terrestrial broadcast tuner 16, and the network connection unit 22, respectively. If the channel is a pay channel broadcast, a control word that is a random number generated value decoded through each smart card (Smart Card # 1, # 2, # 3, ...) 30 inserted in the CAM 26 or the smart card interface 32 (CW) is extracted and delivered to the DE-MUX 24 to descramble the EMM packet and the ECM packet in the transport stream of the satellite, terrestrial, or cable broadcasting channel with a control word (CW). Decode into a transport 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 a 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.

By the way, the pay channel reception limiting device in the broadcast receiver according to the prior art charges only as long as the pay per view (PPV) method is used to watch pay channel broadcast using the CAM 26 or the smart card 30. Provide a pay-as-you-go service.

However, when passing through the tunnel by car, the broadcasting viewing amount is continuously counted even if the broadcast quality of the paying channel being watched becomes worse while watching the paying channel broadcast due to weather, climate, or obstacles.

In the conventional PPV payment method, there is no set or callback function with a callback function, and a method of paying a fee for a predetermined time and subtracting the fee for watching the user, and a user using a return path. Therefore, there are various things such as calling back information and time watched by a broadcaster.

However, the conventional payment method of the PPV method considers an error situation in which the broadcast quality of the pay channel being watched is degraded while the pay channel is being watched due to the external environment such as tunnel, weather, climate, or obstacle. Since the user does not have the problem of paying for the screen breakage that may occur in the middle of viewing.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art as described above, and includes a detection unit that detects a transport stream error of a received pay channel broadcast so that an image quality of the pay channel broadcast is deteriorated by an external environment. The present invention provides a pay channel reception limiting device for error detection in a broadcast receiver capable of stopping a time count and reducing a viewing fee.

Another object of the present invention is to detect a transport stream error of a pay channel broadcast received, and to stop the PPV time count when the error is detected, thereby reducing the viewing fee when an error occurs that the quality of the pay channel broadcast is degraded by the external environment. The present invention provides a control method of a pay channel reception limiter for error detection in a broadcast receiver.

In order to achieve the above object, the present invention provides a tuner for performing error correction and interleaving according to a control while receiving a transport stream of a channel broadcast through an antenna, and a control for descrambles a pay channel broadcast among channel broadcasts received by the tuner. The CAM / smart card that generates the word, the error detection unit that detects an error in the transport stream of the pay channel broadcast when the channel broadcast received by the tuner is a pay channel broadcast, and the transport stream of the pay channel broadcast received by the tuner Demux that decodes and descrambles the encryption with the control word of the smart card, and controls the descrambling while counting the pay-per-view (PPV) time when no error is detected in the transport stream of pay channel broadcasting through the error detection unit. The number of error detections when an error is detected in the transport stream of a pay channel broadcast. The tuner is controlled to execute error correction and interleaving while counting, and the tuner is controlled to re-execute error correction and interleaving while stopping the counting of the paid viewing time when the number of error detection is more than a preset limit, but the number of error detection is preset. If it is less than the limit includes a microcomputer to control the descrambling while counting the paid viewing time.

In order to achieve the above object, the present invention provides a method of determining whether a pay channel is received while receiving a transport stream of a channel broadcast, and determining whether an error is detected in the transport stream of the pay channel when the received channel broadcast is a pay channel. And when the error is not detected in the transport channel of the pay channel, descrambling and outputting the pay stream of the pay channel broadcast while counting the pay-per-view (PPV) time, and detecting the error in the transport stream of the pay channel broadcast. Performing error correction and interleaving on the transport stream while counting the number of error detections, if the error detection count is greater than or equal to a preset limit, resuming error correction and interleaving while stopping counting the paid viewing time; For paid viewing when the number of error detections is less than the preset limit While the count and a step for outputting to descramble the transport stream of the pay-per-view broadcast.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2 is a block diagram showing a pay channel reception limiting device for error detection in a broadcast receiver according to the present invention.

2, in the broadcast receiver according to the present invention, the pay channel reception limiter for error detection includes: antennas 100 and 102, satellite and terrestrial broadcast tuners 104 and 106, demodulators 108 and 110, Network connection unit 112, DE-MUX 114, CAM 116, controller 118, smart card 120, smart card interface 122, microcomputer 124, error detection unit 126 , A key input unit 128, a memory 130, a display 132, an audio decoder 134, a video decoder 136, 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.

The DE-MUX 114 encrypts the EMM packet and the ECM packet, which are paid reception restriction signals in the transport stream of the corresponding broadcast signal when the transmitted satellite broadcast channel, terrestrial broadcast channel, or cable broadcast channel is broadcast of the pay channel. The extracted random number generation value is extracted and transferred to the CAM 116 or the smart card interface 122 through the microcomputer 124 and the controller 118. The DE-MUX 114 that receives the control word CW, which is a random number generated value decoded by the CAM 116 or the smart card interface 122, through the microcomputer 124 and the controller 118 is descrambled. EMM packets and ECM packets are descrambled using a key control word (CW) and decoded into a stream of an original broadcast signal.

The CAM 116 communicates with the microcomputer 124 through the controller 118 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 122 communicates with the microcomputer 124 through the controller 118 when the smart cards 120 equipped with the CAS function capable of watching pay channel broadcasting are inserted into the CAS slot.

The microcomputer 124 controls internal components of the broadcast receiver, which is a set-top box, and communicates with the controller 118 to detect whether the CAM 116 / smart card interface 122 is removed or mounted. The microcomputer 124 tunes (selects) any broadcast channel among satellite broadcasts, terrestrial broadcasts, and cable broadcasts according to a key signal input from the key input unit 128 to demux the transport stream of the tuned broadcast channel (DE-MUX). 114 to control to parse video, audio, and the like.

In the microcomputer 124 of the present invention, an error is detected through the error detector 126 in the transport stream of the satellite broadcast, the terrestrial broadcast, or the cable broadcast transmitted from the demodulator 108, 110, or the network connection 112. In this case, the satellite broadcast tuner 104 and the terrestrial broadcast tuner 106 control to perform forward error correction (FEC) and interleaving, which are error corrections. The microcomputer 124 stops the PPV time count when the error count is greater than or equal to a preset limit, and controls to re-execute the FEC and interleaving.

If an error is not detected through the error detection unit 126, the transmission stream of the satellite broadcasting, the terrestrial broadcasting, or the cable broadcasting transmitted from the network connection unit 112 demodulated by the demodulators 108 and 110 may not be detected. 124 counts the PPV time and transmits a control word (CW), which is a random number generated value decoded in the CAM 116 or the smart card interface 122, to the DE-MUX 114 to determine the pay channel. After descrambling the EMM packet and the ECM packet in the transport stream, the audio and video stream is decoded by the MPEG decompression algorithm and then controlled to be output. At this time, the counted PPV time is recorded.

The key input unit 128 is a part for receiving a key signal for operating the broadcast receiver or receiving a remote control signal.

The memory 130 stores information on whether the control word used for descrambling the pay channel broadcast is transmitted in the CI or CAS slot, and stores data necessary for controlling the operation of the microcomputer 124.

When an error is detected in the transport stream of satellite broadcasting, terrestrial broadcasting, or cable broadcasting through the error detecting unit 126, the display unit 132 displays the error detection status to the outside with an LED or the like.

The audio decoder 134 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 136 decodes the video stream from the broadcast stream delivered from the DE-MUX 114 with an MPEG decompression algorithm and then outputs it to a monitor of a television.

The pay channel reception limiting device in the broadcast receiver according to the present invention configured as described above includes a satellite stream, a terrestrial broadcast, or a cable broadcast transmitted from the network connection unit 112 demodulated by the demodulators 108 and 110. Stops the PPV time count when an error is detected in the control channel, and decodes the control word CW decoded in the CAM 116 or the smart card interface 122 while continuously counting the PPV time when an error is not detected in the transport channel of the pay channel. ) To descramble the transport stream of the corresponding paid channel and output it.

Therefore, the pay channel reception limiter in the broadcast receiver according to the present invention can reduce the pay viewer fee by stopping the PPV time count when an error occurs that the picture quality of the pay channel broadcast is degraded by the external environment.

3 is a flowchart sequentially illustrating a control method of a pay channel reception limiting apparatus for error detection in a broadcast receiver according to the present invention.

2 and 3, the control method of the pay channel reception limiting device for error detection in the broadcast receiver according to the present invention proceeds as follows.

First, when a key signal for tuning (tuning) a broadcast of an arbitrary pay channel is input from the key input unit 128 in the broadcast receiver of the present invention, the microcomputer 124 is a satellite broadcast tuner 104 and a terrestrial broadcast tuner ( 106, the network connection unit 112 receives the satellite broadcast, terrestrial broadcast, or cable broadcast, respectively, and demodulates it (S100).

The microcomputer 124 demuxes the transport stream of the pay channel received through the DE-MUX 114, and determines whether the demuxed transport stream is the pay channel (S102 to S104).

If the demuxed transport stream is a pay channel broadcast signal, the microcomputer 124 determines that the satellite broadcast, terrestrial broadcast, or network connection unit 112 is demodulated by the demodulators 108 and 110 through the error detector 126. It is determined whether an error is detected in the transport stream of the pay channel during the cable broadcast delivered in step S106.

As a result of the determination in S106, when an error is detected in the transport stream of the pay channel, the microcomputer 124 controls to execute FEC and interleaving through the satellite broadcast tuner 104 and the terrestrial broadcast tuner 106. (S108) Although not shown in the drawing, the microcomputer 124 externally detects the error detection state through the display unit 132 when the error is detected in the transport stream of satellite broadcasting, terrestrial broadcasting or cable broadcasting through the error detecting unit 126. Display on.

The microcomputer 124 determines whether the number of error counts detected by the error detector 126 is greater than or equal to the preset limit, and stops the PPV time count if the number of error counts is greater than or equal to the preset limit. (S110 to S112).

The microcomputer 124 repeats the step S110 after controlling to re-execute the FEC and the interleaving through the satellite broadcast tuner 104 and the terrestrial broadcast tuner 106 (S114).

On the other hand, if it is determined in S106 that no error is detected in the transport stream of the pay channel, or if it is determined in S110 that the number of error counts is less than the preset limit, the microcomputer 124 counts the PPV time (S116).

Then, the microcomputer 124 transmits the control word CW, which is a random number generation value decoded by the CAM 116 or the smart card interface 122, to the DE-MUX 114, and the de-mux DE-. In the MUX 114, the EMM packet and the ECM packet in the transport stream of the pay channel broadcast are decoded and descrambled by the control word CW (S118).

The microcomputer 124 decodes the audio stream of the transport stream delivered from the DE-MUX 114 through the audio decoder 134 with an MPEG decompression algorithm, and decodes the video through the video decoder 136. DE-MUX) 114 controls to decode the video stream delivered by the MPEG decompression algorithm (S120).

The microcomputer 124 records the counted PPV time in the memory 130 or the like (S122).

Then, the microcomputer 124 outputs the audio signal decoded by the audio decoder 134 to a speaker or an audio amplifier of the television, and controls to output the video signal decoded by the video decoder 136 to a monitor of the television or the like. S124)

As described above, the present invention detects an error in a transport stream of a received pay channel broadcast, stops the PPV time count while an error is detected in the transport channel of the pay channel, and detects an error in the transport stream of the pay channel. If not, the transmission stream of the paid channel is descrambled using a CAM or smart card, and then outputted. Then, when an error occurs that the quality of the paid channel broadcast is deteriorated by the external environment, the PPV time count is paused to reduce the viewing fee. Can be.

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 (4)

A tuner for performing error correction and interleaving under control while receiving a transport stream of a channel broadcast through an antenna; A CAM / smart card for generating a control word for descrambling pay channel broadcast among channel broadcasts received by the tuner; An error detector for detecting an error in the transport stream of the pay channel broadcast when the channel broadcast received by the tuner is a pay channel broadcast; A demux for deciphering and outputting a transmission stream of a pay channel broadcast received by the tuner with a control word of the CAM or a smart card, and outputting the descrambled signal; When the error is not detected in the transport stream of the pay channel broadcast through the error detection unit, the descrambling is controlled while counting the pay-per-view (PPV) time, and when an error is detected in the transport stream of the pay channel broadcast. The tuner is controlled to execute the error correction and interleaving while counting the number of error detections, and when the error detection number is greater than or equal to a preset limit, the tuner is configured to re-execute the error correction and interleaving while stopping the counting of the paid viewing time. To control the descrambling while counting the paid viewing time when the error detection count is less than a preset limit. Pay channel reception limiter for error detection in the broadcast receiver comprising a. The method of claim 1, The device, When the error is detected in the transport stream of the pay channel broadcast via the error detector further comprises a display unit for displaying the external pay error reception device for error detection in the broadcast receiver. Determining whether the channel is a paid channel while receiving a transport stream of the channel broadcast; Determining whether an error is detected in a transport stream of the pay channel when the received channel broadcast is a pay channel; Descrambling and outputting the transport stream of the pay channel broadcast while counting the pay-per-view (PPV) time when an error is not detected in the transport stream of the pay channel; Performing error correction and interleaving on the transport stream while counting the number of error detections when an error is detected in the transport stream of the pay channel broadcast; Re-executing the error correction and interleaving while stopping counting the paid viewing time when the number of error detections is equal to or greater than a preset limit; If the number of error detections is less than the preset limit, descrambling and outputting a transport stream of a pay channel broadcast while counting the pay time; Control method of the pay channel reception limiting device for error detection in the broadcast receiver comprising a. The method of claim 3, wherein The method, And displaying an error detection state externally when an error is detected in the transport stream of the pay channel.

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