KR20040108289A - Digital satellite broadcasting receiver - Google Patents

Abstract

PURPOSE: A digital satellite broadcasting receiver is provided to simultaneously tune multi-channel through a single satellite broadcasting receiver, and simultaneously receive different channels tuned through respective display devices that are located respectively in a plurality of separate spaces. CONSTITUTION: A multi-tuner unit consisting of a plurality of tuners(14-1,14-2,...,14-n) and demodulators converts satellite signals into TP(TransPort stream) signals by tuning and demodulating the satellite signals to corresponding to channels respectively, and outputs the TP signals. A CAS(Conditional Access System) part(144) descrambles the TP signals. A multi-demultiplexer(142) divides the descrambled TP signals into audio signals and video signals of respective channels. A multi-decoding part(143) respectively multi-decodes the audio signals and video signals of respective channels through corresponding decoding operation and outputs the decoded audio signals and video signals to a plurality of display devices located respectively in a plurality of separate spaces.

Description

Digital satellite broadcasting receiver

The present invention relates to a receiver for receiving digital satellite broadcasting, and in particular, to tune multiple channels simultaneously through one satellite broadcasting receiver and to simultaneously watch different channels tuned through each display device in a plurality of independent spaces. The present invention relates to a digital satellite broadcast receiver.

In general, digital satellite broadcasting has spread rapidly to Europe, Japan, Asia, and Africa since the world's first DirecTV in 1994, and can be viewed anywhere in the world.

Digital satellite broadcasting is a method of compressing video / audio / additional data and transmitting digitally through satellites in MPEG 2 standard, and is related to a wide coverage area and region which are inherent to satellites compared to other transmission media. Due to the lack of equal broadcasting quality, economics of establishing a satellite broadcasting network, and simplicity of satellite channels, it is mainly led by pay broadcasting companies.

In addition, a CAS (Conditional Access System) is used to restrict the reception so that only subscribers can receive it in the pay-through broadcasting through the receiving channel capable of receiving the digital satellite broadcast.

The CAS provides a TV program and a data service signal scrambled by a transmitting station for pay-per-channel (PPC) and pay-per-view (PPV) channels other than the free and basic channels of satellite broadcasting. It is a system for managing a subscriber to receive a service by descrambled using a smart card. Here, the PPC is a service that collects a predetermined fee for receiving a channel and is able to receive a broadcast, and the PPV is a service that calculates and charges a fee per program as a reception time. To this end, the CAS operator issues a smart card to the subscriber. Smart cards are also known as Conditional Access Modules (CAMs).

The smart card stores, for example, channel information that a user can view in the memory portion in the case of a pay channel, and usage information in the case of a PPV.

The PPV service allows the user to purchase a movie or sporting event in advance, for example. In other words, the user may purchase a paid viewing program through the smart card.

Therefore, it is possible to extract the information stored in the smart card when the reception system operator or receiver requests, and the smart card has a decryption function that can descramble the scrambled signal, thus descrambling the scrambled TV program. Provide the key needed for.

The digital satellite broadcast includes not only a program but also program guide information. The program guide information is called APG (Advanced Program Guide) in digital satellite broadcasting such as DirecTV, and EPG (Electronic Program Guide) in digital terrestrial broadcasting. The program guide information is additional data information that allows the viewer to more conveniently use the TV to watch TV, and the viewer can obtain information about the current broadcast program and the future broadcast program directly on the screen without a newspaper or other guide medium. .

On the other hand, as people's income levels rise and their lives get better, it's common for homes to have more than one television these days.

However, in the related art, in order to receive a digital satellite broadcast from a plurality of televisions in a home, a satellite broadcast receiver must be installed for each TV and a smart card is issued, thereby increasing the user burden including a subscription fee. That is, one smart card is issued to one satellite broadcasting receiver in order to limit illegal viewing of a non-subscriber.

Accordingly, an object of the present invention relates to a receiver for receiving a digital satellite broadcast, and in particular, to tune multiple channels simultaneously through one satellite broadcast receiver, and to tune different channels tuned through each display device in a plurality of independent spaces. It is to provide a digital satellite broadcast receiver that allows simultaneous viewing.

1 is a conceptual block diagram of a digital satellite broadcast receiver according to the present invention;

FIG. 2 is a detailed block diagram of the digital satellite broadcast receiver according to FIG. 1.

Explanation of symbols for main parts of the drawings

110: satellite antenna

120: LNB

130: multi switching unit

140: satellite broadcast receiver

141-1... 141- (n-1): Tuner

142: multi demultiplexer

143: Multi Decoder

144: CAS

145: CPU

150-1... 150- (n-1): Display Device

According to an aspect of the present invention for achieving the above object, a plurality of tuners and demodulators are provided, the multi-tuner unit for tuning and demodulating a plurality of satellite signals to the corresponding channel, descrambles the TP signal A multi-demultiplexer for outputting the TP signal output from each tuner of the multi-tuner unit to the CAS unit for descrambling, and then separating the decoded TP signal into audio and video signals of each channel; And a multi-decoder for multi-decoding the audio signal and the video signal of each channel output from the multi-demultiplexer by the corresponding decoding algorithm and outputting the multi-decoder to the display apparatuses installed in separate spaces.

Preferably, the CAS unit manages information related to user registration and authentication and billing.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a conceptual block diagram of a multi-channel satellite broadcast receiver according to the present invention, which includes an antenna 110 capable of receiving digital satellite broadcast of a high frequency band and a satellite signal of a high frequency band received through the antenna 110. Low noise amplifier (LNB) 120 for low noise amplification, a multi-switching unit 130 for dividing and outputting a plurality of satellite signals output from the LNB 120, the output from the multi-switching unit 130 A satellite that receives a plurality of satellite signals, tunes to channels required by the display devices 150-1 and 150- (n-1) installed in each independent space, converts them into a transport stream (TP), and outputs them. The broadcast receiver 140 and each of the plurality of display devices 150-1 and 150-(n-1) for displaying information of a specific channel from the satellite broadcast receiver 140 are connected to each other through a cable.

FIG. 2 is a detailed block diagram of the satellite broadcasting receiver 140, and a plurality of tuners 141-1 to 141 (n-1), a CAS unit 144 for user authentication and descrambling, and the plurality of tuners. A multi-demultiplexer for outputting the TP signals respectively outputted from (141-1 to 141 (n-1)) to the CAS unit 144 to descramble and separate audio and video signals from the descrambled stream signals; 142 and multi-decode the audio signal and the video signal of the multi-channel output from the multi-demultiplexer 142 by the video and the audio decoding algorithm, respectively, and then display devices 150-1,... A multi-decoder 143 outputting to 150- (n-1), a CPU 145 and a remote controller (for example, controlling the overall operations of the multi-demultiplexer 142 and the multi-decoder unit 143). For example, an n-channel remote receiver 146 for receiving an input of a remote controller). It is configured by.

Here, the plurality of tuners 141-1 to 141 (n-1) demodulate the satellite signals of the tuned channel by Quadrature Phase Shift Keying (QPSK) to convert them into TP.

The CAS unit 144 manages user registration, authentication, and billing related information by using a smart card inserted into the CAS unit 144 and simultaneously descrambles scrambled data.

The operation of the satellite broadcast receiver configured as described above is as follows.

First, a satellite broadcast is to be received through a plurality of display devices installed in different independent spaces. At this time, each user of the display apparatus inputs a corresponding channel to be watched through the remote control device, and detects the same by the n-channel remote receiver 146.

Then, a plurality of multi-tuners 141-1 to 141 (n-1) tune and demodulate the high-frequency band satellite signals in multi-demultiplexed form in the form of TP and output the multi-tuners 141-1 to 141 (n-1). Outputs the TP signal output from each tuner to the CAS unit 144 to perform descrambling, and then separates the demultiplexed audio and video signals from the descrambled stream signal into audio and video signals. After decoding, the broadcast of a corresponding channel is output to a display device installed in an independent space.

The user can then independently watch the desired satellite broadcast channel in each independent space.

As described above, the present invention tunes multiple channels simultaneously through one satellite broadcast receiver, multi-decodes the TP signals of the tuned channels, and outputs them to a display device of a plurality of independent spaces. The advantage is that the channel can be received independently.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (2)

A multi-tuner unit having a plurality of tuners and demodulators for tuning and demodulating a plurality of satellite signals into corresponding channels and outputting them in TP form; A CAS unit for descrambling the TP signal; A multi-demultiplexer which demultiplexes the TP signal output from each tuner of the multi-tuner unit to the CAS unit and then descrambles the audio and video signals of each channel from the descrambled TP signal; And a multi-decoder for multi-decoding the audio signal and the video signal of each channel output from the multi-demultiplexer using a corresponding decoding algorithm and outputting the multi-decoder to the display apparatuses installed in separate spaces. receiving set The method of claim 1, The CAS unit manages information related to user registration, authentication, and billing.