KR100577146B1 - Apparatus for digital broadcasting receiving - Google Patents

Abstract

The present invention relates to a digital broadcast receiver for enhancing the adaptability of a digital TV by using a common interface (CI) module. Particularly, the front end unit for terrestrial broadcast reception, satellite broadcast reception, and cable broadcast reception is each CI-modulated, that is, according to the transmission method. It is not necessary to develop the whole system or each set including each front end part according to whether it is a terrestrial, satellite, cable or cable. It can increase. In addition, even when connected to a network such as VOD, other resources can be used as CI modules, so in case of failure, only the relevant module needs to be replaced, so A / S is easy, and SI information is additionally transmitted without transmitting SI through broadcasting. In addition to the CI module, navigation is easy.

Description

Apparatus for digital broadcasting receiving

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital TVs for receiving digital broadcasts, and more particularly, to a digital broadcast receiver for enhancing adaptability of digital TVs using a common interface (CI) module.

In general, digital TV broadcasting transmits service information (SI) in addition to basic MPEG-2 audio / video (A / V) data in order to support a better service to viewers.

Therefore, the digital broadcasting receiver uses the additional information (SI) to show viewers the service and event information (= desired program) currently being broadcasted by the method of Graphic User Interface (GUI). It also enables navigation between services, between services, or between events. For example, the viewer can electronically select a program while searching directly on the screen without a newspaper or other guide medium.

FIG. 1 shows an example of a service list menu displayed on a TV screen using such an SI. If ABC is selected, a program or another service list menu provided by ABC is displayed in a submenu form. When the desired item is selected again from the sub menu, detailed information about the selected item is displayed. In this way, the viewer can obtain desired information on the screen through the navigation process.

FIG. 2 is a block diagram illustrating a general digital broadcast receiving apparatus and illustrates an example of a European type using an orthogonal frequency division (OFDM) demodulation scheme. That is, the digital demodulation circuit corresponding to the terrestrial broadcasting, which is digital broadcasting, employs 8 residual side bands (VSB) in the United States and OFDM in Japan and Europe.

Referring to FIG. 2, the tuner 201-1 receives a OFDM signal through an antenna at a front end unit 201 including a tuner 201-1 and an OFDM demodulator 201-2. The demodulator 201-2 outputs the demodulator 201-2. The OFDM demodulator 201-2 performs a Fast Fourier Transform (FFT) on the received OFDM signal and outputs the result to the error correcting unit 202. In other words, when transmitting the desired data by the OFDM scheme, the transmitting side maps the data to be transmitted according to the modulation method, undergoes an Inverse Fast Fourier Transform (IFFT), and then inserts a guard interval into the frequency domain. Since the transmission is performed, demodulation in the general transmission scheme is possible by performing the FFT on the receiving side.

In addition, since the frequency alignment between the transmitter and the receiver (Frequency Alignment) significantly affects the overall performance of the system, the OFDM demodulator 201-2 performs automatic frequency control for correcting the frequency error between the transmitter and the receiver. An Auto Gain Control (AGC) signal for controlling the Auto Frequency Control (AFC) signal and the gain is output to the tuner 201-1.

Meanwhile, the error correction unit 202 extracts a transport stream by performing Viterbi decoding, synchronization detection, Reed-Solomon decoding, deinterleaving, and the like. ) The MPEG demultiplexer 203 receives an input stream multiplexed according to the MPEG system standard and performs demultiplexing. Here, demultiplexing refers to identifying a packet ID (PID) and separating it into a video signal sequence, an audio signal sequence and an SI signal sequence.

The video signal sequence separated by the MPEG demultiplexer 203 is output to the MPEG video decoder 205 having an On Screen Display (OSD) function, and the audio signal sequence is output to the MPEG audio decoder 207. In addition, the SI signal sequence is databased in the RAM 204 with information to be displayed by the GUI through another filter.

The MPEG video decoder 205 decodes the compressed video signal sequence using an MPEG algorithm and restores the original signal. The DRAM 206 is used as an external memory to decode the video signal sequence. The MPEG video decoded signal is output to the analog encoder 208, and the analog encoder 208 encodes the MPEG video decoded video signal into an analog (for example, PAL) signal and then outputs the RGB signal to a general TV or a monitor. It outputs as a luminance signal (Y) and a color signal (C) for display.

In addition, the MPEG audio decoder 207 decodes the compressed audio signal sequence using an MPEG algorithm and restores the original signal. The D / A converter 209 converts the decoded digital voice signal into an analog voice signal (R, L). And so on.

The central processing unit (CPU) 200 that controls the overall system executes programs stored in the RAMs 210 and 211. Graphical user interface (GUI) programs and graphic data are also stored in the RAM 210 and 211.

In addition, the CPU 200 may be connected to a front panel controller, an IR receiver, a telephone modem, or the like, and may transmit and receive low speed data to and from an external device through an RS232 serial data input / output port.

However, since the front end portion 201 including the tuner varies according to a transmission method, that is, a terrestrial wave, a satellite, or a cable, the set according to each transmission method (here, the set is a set-top box or Or a new system having a front end portion of each transmission system. This leads to problems of complicated, bulky, and expensive digital broadcast receivers.

In addition, there was no method in the case of additional SI navigation without transmitting SI information.

In addition, when connected to a network and using other resources (eg, Video On Demand (VOD)), the modularity is not easy because it is not modular.

The present invention is to solve the above problems, an object of the present invention to improve the adaptability of the digital TV by making a front end of each transmission method as a CI module for transmitting and receiving signals through a common interface (Common Interface; CI) The present invention provides a digital broadcast receiving apparatus.

Another object of the present invention is to provide a digital broadcast receiving apparatus for navigating SI information not transmitted through broadcast using a CI module.

It is still another object of the present invention to provide a digital broadcast receiving apparatus that enables another resource to be used by a CI module when connected to a network.

According to the present invention for achieving the above object, the digital broadcasting reception apparatus according to the present invention comprises the CI module according to each transmission method after the CI module according to the transmission method, respectively, according to the transmission method according to the transmission method. And receiving the corresponding digital broadcast.

The additional information provided by the CI module may be added to the additional information included in the broadcast signal to enable navigation.

When the digital broadcast reception device is connected to a network such as VOD, another resource is used as a CI module.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a simplified schematic diagram between a CI module and a host (ie, a TV main body) in a digital broadcasting receiver according to the present invention, wherein the CI module includes a front end unit including a tuner 321 and a demodulator 322. 320 is configured. In this case, the front end 320 may be implemented for terrestrial broadcast reception, satellite broadcast reception, and cable broadcast reception, respectively. In addition, the host and CI modules include CPUs 312 and 323, memory 314 and 325, and demultiplexers 311 and 324.

That is, the tuner 321 of the CI module receives the OFDM signal through the antenna under the control of the CPU 323 and outputs it to the demodulator 322, and the demodulator 322 performs OFDM demodulation on the received signal. After performing the control, the CPU 323 outputs the demultiplexer 324 of the CI module to the demultiplexer 311 of the host through the CI.

The demultiplexer 324 of the CI module demultiplexes the OFDM demodulated signal under the control of the CPU 323 and stores only SI information among the demultiplexed signals in the memory 325 through the CPU 323.

The demultiplexer 311 of the host demultiplexes the OFDM demodulated signal according to the MPEG system standard as shown in FIG. 2, and divides the signal into an image signal sequence, an audio signal sequence, and an SI signal sequence, and then SI information is decoded from the CPU ( Stored in memory 314 via 312. Here, the processing of the video signal sequence and the audio signal sequence is the same as in FIG.

At this time, the CPU 323 of the CI module and the CPU 312 of the host exchange control information and SI data with each other, and display the SI information on the TV screen through the SI engine 313 of the host.

4 is a detailed block diagram of a digital broadcast receiver according to an embodiment of the present invention to which a CI module is applied. The front end part is also present inside the CI module.

That is, the digital broadcasting receiver has only a front end portion depending on whether the transmitted signal is terrestrial digital broadcasting, satellite broadcasting, or cable broadcasting, and the rest of the digital broadcasting receiver complies with the MPEG-2 standard and the DVB SI standard as shown in FIG. Is developed for terrestrial broadcast reception, satellite broadcast reception, and cable broadcast reception, respectively, and connected to the digital broadcast receiver as shown in FIG. 2 to receive A / V for each broadcast and also display SI information to the user. have.

In this case, the front end part may exist only in the CI module or both in the host (TV main body) and the CI module. That is, the host basically configures the front end according to one transmission method, and the CI module configures the front end of another transmission method except for this to receive a signal transmitted through the antenna using any one according to the transmission method. Can be.

For example, when the front end is present only in the CI module, when receiving terrestrial broadcasting, receiving a terrestrial broadcasting receiving CI module, and when receiving a satellite broadcasting, receiving a satellite broadcasting receiving CI module and a cable broadcasting. The cable broadcast reception CI module can be connected and received, and the received broadcast signal is output to the MPEG demultiplexer 203 of the TV main body through the CI. Subsequent operations are the same as in FIG.

In addition, when the front end for terrestrial broadcast reception is present in the host, the terrestrial broadcast is received through the front end of the host or connected to the terrestrial broadcast receiving CI module to be received and output to the MPEG demultiplexer 203 and the satellite. The broadcast is received through the CI module for satellite broadcast reception and the cable broadcast is received through the CI module for cable broadcast reception, and then output to the MPEG demultiplexer 203 of the TV main body through the CI.

In this case, the terrestrial broadcasting CI module, the satellite broadcasting CI module, and the cable broadcasting CI module may all be connected to the TV main body or may be connected to only one CI module according to a transmission method.

In addition, since satellite broadcasting is required to adopt a CAD for viewer management and toll collection, the CAS may be CI modularized.

Meanwhile, FIG. 5 shows a navigation state of SI information using a MMI (Man Machine Interface) of a CI module. Here, MMI refers to an interface that displays SI information or graphic information in the CI module on the screen when the CI module is connected, and CI refers to a protocol for managing and using resources between the host and the CI module.

That is, when the CI module is connected while viewing an Electronic Program Guide (EPG) screen using the SI information transmitted over the air, the CI module for the user to search or navigate the SI information provided by the CI module. MMI will be displayed on the screen. Therefore, the user can browse the information of the CI module using the MMI.

Specifically, the function will be described as follows.

That is, there are various ways to implement the above functions, but only three of them will be described.

First, when a navigation application appears on the host as shown in FIG. 6, the host application is run through an interface with a service gateway resource of the CI module, and accordingly a TV service stream is hosted. Send it to your TV service decoder for decoding. For example, if a user requests a service while the service list is displayed, the TV service decoder may receive and decode the stream of the service.

The second case is a case where a type specific decoder is built in the CI module as shown in FIG. 7. In other words, if the navigation application is present in the host and the host MMI is present, the host drives the service gateway resource of the CI module through an interface with the CI module. The service gateway resource then requests a service request from the type characteristic decoder. The type characteristic decoder receiving the service request decodes the service and performs service delivery to the MMI of the host.

This application can be used in cases such as VOD, allowing the TSD to view the catalog to the user. Thus, selecting a catalog allows MPEG A / V streams to be sent from the CI module to the host.

The third case is a case where a type characteristic decoder exists in a host as shown in FIG. 8, where a new resource type given by a CI module is recognized and used. This application is used when the CI module supports the network file system (implemented by the DSM-CC protocol). The type attribute extension of the CI module can support the file system using the DSM-CC API. Here, the TSD may be an MHEG-5,6 engine of the DSM-CC U-U API.

FIG. 9 is a control flowchart using a service gateway resource between a host and a CI module when the EPG is actually driven. First, the operation of the EPG is shown to the user, and the flow between the host and the CI module is described internally. have.

That is, the host requests the CI module for a service list, such as a list of broadcaster names (step 801). The CI module then returns a list of services to the host (step 802). If the host also requests a version of the service list (step 803), the CI module also returns a version of the service list to the host (step 804). The host compares the stored version of the service list with the newly entered version of the service list (step 805), and if it is determined that the two version numbers are the same, requests the service description from the CI module (step 807). Then, the CI module returns the service description to the host (step 808), and the host receives the service description and displays it on the screen (step 809). If it is determined in step 805 that the two version numbers are not the same, the host requests the CI module to examine the service list change (step 806), and then asks the CI module for a new version of the service description (step 807). Then, the CI module returns the service description to the host (step 808), and the host receives the service description and displays it on the screen (step 809).

10 is a control flow diagram between a host and a CI module in the case of requesting a specific service list, in which the host requests a specific service list from the CI module (step 901). The CI module then returns a list of specific services to the host (step 902). The host receiving the specific service list again requests the service description from the CI module (step 903), and the CI module returns the specific service description to the host (step 904). The host then receives the specific service description and displays it on the screen (step 905).

In this way, the CI module can be used for various applications. For example, the front-end part of the digital TV, 1394, modem, etc. can be CI moduled.

As described above, according to the digital broadcast receiver according to the present invention, the front end portions for terrestrial broadcast reception, satellite broadcast reception, and cable broadcast reception are each CI-modulated according to the transmission scheme, that is, whether terrestrial or satellite or cable. There is no need to develop an entire system or each set separately, including each front end. This not only reduces the volume of the set, but also reduces the number of parts, increasing the competitiveness of the product. In addition, the after-sales service (A / S) is easy because only the corresponding module needs to be replaced in case of failure.

Similarly, even when connected to a network such as VOD, other resources can be used as CI modules, thereby making it easy to modify (modularity).

In addition, it is possible to easily navigate by adding SI information to the CI module without transmitting SI through broadcast.

1 is a diagram illustrating an example of a service list menu displayed on a screen of a general digital broadcasting receiver.

2 is a block diagram of a general digital broadcast receiving apparatus

3 is a conceptual block diagram of a digital broadcast receiving apparatus according to the present invention;

4 is a detailed block diagram of FIG.

5 is a diagram illustrating an example of a service list menu displayed on a screen when a CI module capable of navigating SI information is connected to a digital broadcast reception device according to the present invention.

6 shows an embodiment of an application between a host (TV body) and a CI module according to the invention.

7 shows another embodiment of an application between a host (TV body) and a CI module according to the invention.

8 illustrates another embodiment of an application between a host (TV main body) and a CI module according to the present invention.

9 is a flow chart of control between a host and a CI module for requesting a service list in a digital broadcast reception device according to the present invention.

10 is a control flowchart of a host and a CI module for requesting a specific service list in a digital broadcast reception device according to the present invention.

Explanation of symbols for main parts of the drawings

200,312,323: CPU 201,320: Front end

201-1,321: Tuner 201-1,322: OFDM Demodulator

202: error correction unit 203: MPEG demultiplexer

204,210,211: RAM 205: MPEG Video Decoder

206: DRAM 207: MPEG audio decoder

208: analog encoder 209: audio digital to analog converter

311,322 Demultiplexer 314,325 Memory

313: SI engine

Claims (1)

Receives and demodulates a digital broadcast through a tuner and extracts the multiplexed transport stream through error correction, and demultiplexes the multiplexed transport stream to perform video streams, audio streams, and additional information streams. In the digital broadcast receiving apparatus comprising a decoding unit for separating the separated video / audio stream using an MPEG algorithm, and the additional information (SI) into a database, The front end unit has a common interface (IC) modularized to receive a broadcast according to each transmission method according to the transmission method of the digital broadcast, the IC module is connected to the digital broadcast receiving device to receive the corresponding digital broadcast And adding the information to the additional information included in the received broadcast to enable navigation.