KR19990075212A - Digital satellite broadcasting receiver and other channel program display method - Google Patents

Abstract

The present invention relates to a digital satellite broadcasting receiver and another channel program display method that enables other channel programs currently viewed on a sub-screen to be viewed as a video. Especially, a hardware and GUI environment for showing programs of other channels in a small sub screen without a separate tuner is provided. If the 'Current Broadcast' GUI is not selected, the video signal of the selected channel is displayed as a video on the main screen and the program information is displayed in OSD form.If the 'Current Broadcast' GUI menu is selected, 'Current Broadcast' Before the menu is selected, the video signal of the channel is displayed as a still image on the main screen, and when the user selects and searches a channel on each OSD for program information in text form, the PID information of the selected channel is changed. To display the subscreen as a video at the bottom of the screen. As, when separate navigation channels of the other channel program text information without tuner (broadcasting company name, program information) and you can browse through the videos, so you can quickly switch to the desired channel.

Description

Digital satellite broadcasting receiver and other channel program display method

The present invention relates to a satellite broadcast receiver, and more particularly, to a digital satellite broadcast receiver and another channel program display method for watching another channel program that is currently being broadcasted through a sub-screen.

Most current digital satellite broadcast methods follow the Moving Piture Experts Group (MPEG) standard. MPEG-2, the MPEG standard for broadcasting, is specified in the international standards ISO / IEC 13818-1 to 3, which are ISO / IEC 13818-1 (system standard), ISO / IEC (video standard), and ISO / IEC 13818-3, respectively. (Audio standard). Here, the system standard is a regulation regarding a transport stream packet which is a time multiplexed signal sequence. The transport stream is a signal composed of 188 bytes, and this signal can be broadly divided into a header part and a payload part. In this case, the header portion includes information indicating the start of a signal and a PID (Packet Identifier) number indicating which signal is contained in the payload portion. The payload portion includes image information, audio information, Or additional information. The PID number provides a means for demultiplexing a time multiplexed signal. The PID number is used to identify whether the current packet is a video packet, an audio packet, or a service information (SI) packet. Can be.

In addition, the video and audio standards are regulations concerning compressed video and audio signal sequences. Additional information, except for video and audio, is multiplexed in time and transmitted in several transport stream packets. These signal sequences are also distinguished by PID numbers.

1 illustrates a configuration of a general digital broadcast receiver, and is a receiver based on the MPEG standard.

1, the tuner 101 tunes a satellite antenna signal and outputs a quadrature phase signal Q and an in-phase signal I of a quadrature phase shift keying (QPSK) signal.

The A / D converter 102 and the link unit 103 demodulate the QPSK signal output from the tuner 101, correct the error, and output the transport stream. In addition, a part composed of a microcomputer 104, a flash memory 107, 108, a DRAM 109, 110, a microcomputer interface 112, a limited access system (CAD) interface 113 is a system. Take control of the whole. Satellite broadcasting requires the adoption of CAS for viewer management and toll collection.

The microcomputer 104 includes a central processing unit (CPU) and an I / O device, and includes a demultiplexer, a communication port, and the like. At this time, the CPU of the microcomputer 104 executes the program stored in the flash memory (107, 108). Graphical user interface (GUI) programs and graphic data are also stored in the flash memories 107 and 108. The demultiplexer of the microcomputer 104 receives a time multiplexed transport stream as an input through the link unit 103 and performs demultiplexing. Here, demultiplexing refers to identifying a PID number and separating the video signal sequence, the audio signal sequence, and the additional information signal sequence. The separated video signal sequence and the audio signal sequence are output to the MPEG A / V decoder 105, and the additional information signal sequence is databased with information to be displayed by the GUI through another filter.

The DRAMs 109 and 110 are used for data storage in a program execution process. The MPEG A / V decoder 105 restores the compressed video signal sequence and the audio signal sequence to the original signal by decoding, and the synchronous DRAM (SDRAM) 114 buffer memory required for decoding the compressed A / V data. to be.

The NTSC encoder 106 encodes a digital video signal decoded by the MPEG algorithm in the MPEG A / V decoder 105 into an NTSC signal and displays a luminance signal (Y) and a color signal (C) for display on a general TV or monitor. Output The D / A converter 111 converts the decoded digital voice signal into an analog voice signal and outputs the same to a speaker.

2 shows the structure of a transport stream. That is, the transport stream may be divided into an elementary stream and a resource and subscriber management system (RSMS) stream. The elementary stream includes video data stream and audio data stream transmitted through an existing analog broadcast and other data service stream added through digital broadcast.

The main purpose of broadcasting is to send this elementary stream, and the RSMS stream is additional information. Of these, the RSMS message is intended for pay broadcasting in the future.

In this case, SI (Service Information) can be divided into PSI (Program Service Information) and PMM (Program Management Message), PSI is the information required to receive the broadcast, PMM is the broadcast schedule, the plot of the broadcast content, date, time, etc. Says information.

The PSI transmits information and program guide information capable of demultiplexing a desired channel in the form of a table, which is divided into a program association table (PAT), a cultural access table (CAT), and a program map table (PMT). The PMM is divided into an event information table (EIT) for necessary program guide information, a service description table (SDT) for a broadcasting network, a time and date table (TDT) having time information, and a network information table (NIT). Here, the EIT informs the program information of each broadcasting station, the SDT informs the user how many times the channel is currently being broadcast, and the TDT indicates the current time.

The RSMS message is required to obtain a codeword (CW), and includes an entitlement management message (EMM) including individual information such as a customer contract content or a registration number, and a common information such as a program or a control signal. Entitlement Control Message (ECM), Receiver Command Message (RCM), and the like.

Therefore, by extracting and decoding these SI table information at the receiving side, the PID number assigned to each channel, the audio stream, the carrier frequency of the satellite repeater used for transmission, information about the service provided by the system, and date / time Information and program guide information can be obtained. That is, the PID has different values according to the type of audio / video PES stream and PSI information for each channel, so that the receiving side extracts necessary PES stream and PSI information from the transport stream based on this value. Will be performed.

On the other hand, the service stream received from the current Mugunghwa satellite is a stream multiplexed with video and audio information for each channel and additional information indicating how these information is allocated to each channel. Therefore, unlike conventional TVs, TVs with built-in satellite broadcast receivers must first interpret information on a currently broadcasted channel to provide video and audio services.

The process of interpreting this information is called table parsing. The process of parsing the side information table in the service stream received from the Rose of Sharon is as follows. First of all, the PAT packets having the PID value of '0X00' are separated from the service stream to extract the PID of the PMT having the PID of the current broadcasting channel, channel number, and packets constituting the video and audio service of each channel. The PID of the extracted PMT receives the PMT from the service stream and extracts the PID of a packet for transmitting video and audio information constituting each channel. After this analysis, the user can watch the program of the desired channel.

Subsequently, when the network information table (NIT) information indicating the transmission / reception path of the service stream is interpreted, the PID of the packet constituting the contents of the event information table (EIT) indicating information such as title, plot, and broadcast time of each program is known. Can be. The receiver can then know the detailed information of each program by receiving the EIT. The information extracted through this process is stored in a database inside the receiver.

A flowchart for this is shown in FIG. 3.

That is, after receiving and interpreting SI information from digital satellite broadcasting and storing each SI information in DRAMs 109 and 110 (step 301), if the current broadcast key is selected to confirm additional information on the selected channel (step 302). The broadcaster name is detected for each channel (step 303). At this time, if there is a broadcaster name, the service provider name is displayed on the screen (step 305). If there is no service provider name, only the channel number is displayed on the screen (step 306).

After checking the operator name, the program is detected next to each channel (step 307), and it is determined whether there is program information (step 308). At this time, if there is program information, program information for each channel is displayed on the screen as text in the form of an On Screen Display (OSD) (step 309). If there is no program information, a message 'No information' is displayed on the screen. Or proceed to the next execution (step 310).

As such, in the conventional case, the digital satellite broadcasting receiver simply displays the SI information of the other channel on the screen as text only while displaying the main screen currently received without adding a separate routine to receive the sub-screen. . Therefore, it is not possible to perform sub-screen search for the current video by one tuner.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a GUI environment in which a user provides text and video contents of a broadcast program of another channel other than the channel currently being viewed using parsed service information. The present invention provides a satellite broadcast receiver and another channel program display method that enable a user to search for another channel through a single video by a tuner without changing channels.

1 is a block diagram of a conventional digital satellite broadcast receiver

2 is a view showing the structure of a general transport stream

3 is a flowchart illustrating an operation process according to a conventional current broadcast key input.

4 is a block diagram illustrating the configuration of a satellite broadcasting receiver of the present invention for showing a video on a different channel as a small sub-video;

5 is a diagram illustrating an example of a 'current broadcast' GUI environment proposed by the present invention.

6 is a flowchart illustrating an operation process according to selection of a 'current broadcast' GUI according to the present invention.

Explanation of symbols for main parts of the drawings

105: MPEG A / V decoder 106,404: NTSC encoder

401: switching unit 402: buffer

403: Multiplexer

In order to achieve the above object, a digital satellite broadcasting receiver according to the present invention receives a time multiplexed transport stream, demultiplexes the video stream, an audio stream, and an additional information stream, and separates the separated video / audio. A digital satellite broadcasting receiver that decodes a stream using an MPEG algorithm and makes a database of additional information streams, and switching to select a decoded video signal as a main picture or a sub picture signal according to a 'current broadcast' menu selection for channel search. When the 'Current Broadcast' menu is selected, a buffer for storing the main screen signal output through the switching unit immediately before the 'Current Broadcast' menu is selected, the main screen signal stored in the buffer and additional information of the OSD type. A multiplexer for multiplexing, and additional information and multiplexes in the form of OSD in the multiplexer A first NTSC encoder that encodes the converted main picture signal into an NTSC signal and outputs the still picture to the main picture of the display device, and a sub picture signal output through the switching unit as an NTSC signal to produce a video on the sub picture of the display device. And a second NTSC encoder for outputting.

The 'current broadcast' menu for channel searching is provided as a GUI environment.

The other channel program display method of the digital satellite broadcasting receiver according to the present invention is a demultiplexed video stream, an audio stream is decoded by the MPEG algorithm, and the additional information stream is converted into a database and displayed as text in OSD form. In the channel program display method, a main screen display step of displaying a main screen signal as a still image on a display device when a 'current broadcast' menu is selected for channel search, and detecting and detecting a company name and program information for each channel, etc. And a sub-screen data processing step of displaying the same on the display device as text in OSD form, and displaying a video signal of the selected channel as a video on the sub-screen of the display device when the user searches for a channel on the OSD. It characterized by more than true.

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

FIG. 4 is a block diagram of a digital satellite broadcasting receiver of the present invention which proposes to configure a system that shows only a video signal of a channel as a video of a small sub-screen without an OSD on a program that is being broadcast on another channel. This is an additional part of the invention.

That is, the switching unit 401 for switching the video signal output from the MPEG A / V decoder 105 to the main screen or sub-screen signal according to the selection of the 'current broadcast' menu provided in the GUI environment, and selecting the 'current broadcast' menu. The first NTSC is configured by multiplexing the main screen signal output through the switching unit 401 as it is or bypassing and storing the main screen signal of the buffer 402 and additional information SI in OSD form. When the multiplexer 403 outputs to the encoder 106 and the 'current broadcast' menu is selected, a sub-screen signal output through the switching unit 401 is encoded as an NTSC signal to be displayed on a sub-screen of a general TV or a monitor. And a second NTSC encoder 404 for outputting the luminance signal Y and the color signal C.

According to the present invention configured as described above, the demultiplexed video streams and audio streams are input to the MPEG A / V decoder 105 which MPEG decodes them and restores them to their original state. In this case, the stream reconstructed through the MPEG A / V decoder 105 is divided into two processes according to whether a user selects a 'current broadcast' menu, which is a GUI environment implemented in the present invention.

That is, after receiving the SI information from the digital satellite broadcasting, interpreting it and storing each SI information in the DRAMs 109 and 110 (step 601), the user selects the 'current broadcasting' menu to check additional information on the selected channel. If yes, it is determined (step 602).

If the user does not select the 'current broadcast' menu in step 602, the switching unit 401 is switched to the buffer 402. At this time, the video stream that has passed through the MPEG A / V decoder 105 is input to the buffer 402 through the switching unit 401, but the buffer 402 is directly stored into the multiplexer 403 without storing the input video stream. Pass it.

The multiplexer 403 multiplexes the video signal of the selected channel bypassed by the buffer 402 and the SI signal in the OSD form to the first NTSC encoder 106. The first NTSC encoder 106 encodes the digital video signal multiplexed by the multiplexer 403 into an analog NTSC signal and outputs it as a luminance signal and a color signal, which are displayed as moving images on the main screen. The above is similar to the general bit stream processing described in the prior art of FIG.

On the other hand, if it is determined in step 602 that the user selects the 'current broadcast' menu, which is the GUI environment implemented in the present invention, the buffer 402 stores the video stream, that is, the frame of the channel before selecting the 'current broadcast' menu. do. For example, if the video stream input to buffer 402 was channel 11 before the user selected the 'current broadcast' menu, the frames of channel 11 are stored in buffer 402. Then, the still image for the channel 11 is displayed on the main screen through the first NTSC encoder 106 (step 603).

At the same time, the broadcaster name is detected for each channel (step 604). If there is a broadcaster name (step 605), the broadcaster name is multiplexed with the video signal of the channel 11 in the multiplexer 403 using OSD text to display the operator name in the OSD form on the screen. If it is determined that there is no business name (step 606), only the channel number is simply displayed on the screen in OSD form (step 607).

When the confirmation of the name of the service provider is completed, the next broadcast program for each channel is detected (step 608), and it is determined whether there is program information (step 609). In this case, if there is program information, program information for each channel is displayed on the screen in an OSD form (step 610). If there is no program information, a message 'No information' is displayed on the screen, or the next process is performed (step 611). .

When the user searches for and selects a channel on each OSD with respect to the sub-screen information in the OSD form (step 612), the switching unit 401 which has been selecting the input of the first NTSC encoder 106 so far. Switches to the second NTSC encoder 404 (step 613). Then, the PID information of the selected channel is changed (step 614), and the sub-screen is displayed as a video at the bottom of the screen (step 615).

The 'current broadcast' GUI environment of FIG. 5 is made as a concept of providing information of all currently broadcast channels as the title, and each broadcaster's name (eg, KBS satellite 1, EBS satellite 1, etc.) and the program being broadcasted. The title (eg KBS 7:00 Evening News, Satellite Special Youth Concert, etc.) will be displayed in text and the video of the program will be displayed as a sub-screen at the bottom of the screen. Once the user selects the 'Current Broadcast' menu, the 'Current Broadcast' OSD screen as in the example at the top of FIG. 5 is displayed. In this case, when another channel is scrolled by a button operation such as a remote controller, the broadcaster name and program contents of the corresponding channel are displayed using the parsed EIT and SDT information, and the video of the corresponding channel is displayed on the sub screen.

For example, when the user views the KBS satellite 1 of the current channel 11 and selects the 'current broadcast' menu, the video stream of the channel 11 output from the MPEG A / V decoder 105 is stored in the buffer 402.

Then, when the user searches for other channels such as channels 12 and 13 on the 'current broadcast' GUI, only the video signal of the corresponding channel is inputted to the second NTSC encoder 404 by the switching of the switching unit 401. Display the video on the subscreen. In this case, the previous channel, that is, channel 11, stored in the buffer 402 is displayed as a still image on the main screen through the first NTSC encoder 106. Here, only the PID of the corresponding channel is changed to configure the sub-screen of each channel, thereby outputting the stream of the corresponding channel to the second NTSC encoder 404.

As described above, according to the digital satellite broadcasting receiver and the other channel program display method according to the present invention, a 'current broadcast' menu is selected by configuring a hardware and GUI environment showing a program of another channel in a small sub-screen without a separate tuner. If not, the video signal of the selected channel is displayed on the main screen as a video and the program information is displayed in the text of OSD. If the 'Current Broadcast' menu is selected, the video signal of the channel before the 'Current Broadcast' menu is selected When the user searches and selects channels on each OSD for additional information in text form while displaying still images on the main screen, the PID information of the selected channel is changed to display the sub-screen as a video at the bottom of the screen. By displaying, you can program other channels without a separate tuner. Text information (broadcaster name, program information) and you can browse through the videos, so you can quickly switch to the desired channel.

Claims (7)

A digital satellite that receives time-multiplexed transport streams and demultiplexes them into video streams, audio streams, and additional information streams, decodes the separated video / audio streams using the MPEG algorithm, and database additional information streams. In a broadcast receiver, A switching unit which selects a decoded video signal as a main screen or sub picture signal according to a selection of a 'current broadcast' menu for channel searching; A buffer for storing a main screen signal output through the switching unit just before the 'current broadcast' menu is selected when the 'current broadcast' menu is selected, A multiplexer for multiplexing the main picture signal stored in the buffer and additional information in the form of an on-screen display (OSD); A first NTSC encoder for encoding OSD-side additional information and the multiplexed main picture signal in the multiplexer as an NTSC signal and outputting a still picture on the main picture of the display device; And a second NTSC encoder which encodes the sub picture signal outputted through the switching unit into an NTSC signal and outputs a video to the sub picture of the display device as a moving picture. The method of claim 1, wherein the buffer is If the 'current broadcast' menu is not selected, the digital satellite broadcasting receiver for displaying a video on the main screen of the display device by bypassing the main screen signal output through the switching unit to bypass the multiplexer. The digital satellite broadcast receiver as claimed in claim 1, wherein the 'current broadcast' menu for channel searching is provided in a graphical user interface (GUI) environment. In the demultiplexed video streams, audio streams are decoded by MPEG algorithm, and the additional information streams are databaseized and displayed as text in OSD form. A main screen display step of displaying a main screen signal as a still image on a display device when a 'current broadcast' menu is selected for channel searching; A sub-screen data processing step of detecting a company name, program information, etc. for each channel and displaying the same on the display device in the form of OSD text when detected; The sub-channel program display method of claim 1, further comprising displaying a sub-screen displaying a video signal of a selected channel as a video on a sub-screen when the user searches for a channel on the OSD. The method of claim 4, wherein the main screen display step A first process of receiving additional information (SI) in digital satellite broadcasting, interpreting the additional information (SI), and storing each additional information; A second process of determining whether a 'current broadcast' menu is selected for channel searching; If it is determined in the second step that the 'current broadcast' menu is selected, a third method of storing a video signal of a channel before the 'current broadcast' menu is selected and displaying the stored video signal of the channel as a still image on the main screen of the display device Another channel program display method of the digital satellite broadcasting receiver, characterized in that consisting of a process. The method of claim 4, wherein the sub-screen data processing step A first step of detecting a broadcaster name for each channel and displaying the broadcaster name on the display device in the form of OSD text if there is a broadcaster name; And a second process of detecting a broadcast program for each channel and displaying the program information on the display device in the form of an OSD. The method of claim 4, wherein the sub-screen display step A first process of performing a channel search from the additional information displayed in the OSD form by the user on the screen; A second process of selecting a video signal of the selected channel as a sub picture signal by switching when a channel is selected in the first process; A third step of changing a packet unique number (PID) of a channel selected in the second step; And a fourth process of displaying the video signal of the channel whose PID is changed in the third process as a video on the sub-screen of the display device.