KR100252348B1 - Method for selectively program guide packets corresponding to guide channels in satellite broadcasting receiver - Google Patents

Abstract

PURPOSE: A method for receiving a program guide of a satellite broadcast receiver selectively is provided to reduce a memory capacity by selectively receiving a program information on channels outputted to a present guide screen. CONSTITUTION: A program guide packet is received from a broadcasting satellite(110). A micom organizes a table to designate a location of a program information packet corresponding to each channel in a memory unit(120). A channel number displayed on a present guide is detected and a location of a program information packet is read from a series number table(130). A program information packet corresponding to channels adjacent to a present receiving channel is received and saved in the memory unit(140). The micom determines whether a program information on a newly displayed channel is needed when a guide screen is scrolled up and down(150). A guide screen is renewed with using a program information saved in the memory unit in case a guide screen is not moved(160).

Description

Program guide selective reception method of satellite broadcasting receiver

The present invention relates to updating a program guide screen of a digital satellite broadcasting receiver, and more particularly, to a method of automatically updating contents on a program guide screen when a stream provided from a broadcast satellite is updated.

As is well known, satellite broadcasting is capable of receiving broadcast signals from ground stations (broadcasting earth stations) using broadcast satellites in a stationary orbit about 36,000 kilometers above the equator, and receiving them directly from the satellite receiving antennas in each home. As a broadcasting system, a broadcasting system in which a selection range of information is greatly expanded compared to a conventional terrestrial or cable broadcasting system.

The satellite broadcasting receiver used for such satellite broadcasting receives a bit stream provided from a broadcasting satellite, processes a broadcast signal of a selected channel, and then provides it to a display device such as a television set. In this case, various information such as program guide information, broadcast signals for each channel such as video and audio, data signals, and time data table (TDT) are included in the bit stream of the packet provided from the broadcast satellite. .

The program guide information includes a master program guide (MPG) and a special program guide (SPG). The MPG is generally used through an automatic MPG acquisition request by the program guide process in the satellite broadcasting reception system. It provides program information about an hour, and the SPG provides program information to be performed afterwards according to the user's request for obtaining the SPG. The program guide information is received from the satellite according to a program guide acquisition request from the user and stored in the buffer memory of the satellite broadcast receiver, and is provided to the program guide screen through the display device according to the program guide mode.

However, the payload of the series of program guide packets provided from the broadcast satellites is 127 bytes, and the maximum SPG packets are about 230 kilobytes in size. Therefore, it occupies about 1/3 to 1/4 of the buffer memory capacity for receiving all of these program guide packets. That is, one of the data that occupies the most memory capacity in the digital satellite broadcasting receiver is program guide data. Therefore, it is desirable to reduce the capacity of the memory occupied by the program guide data.

Therefore, the present invention has been made in accordance with the above-described needs, and the size of the memory by selectively receiving only the program information for the channels to be output on the current guide screen without receiving and storing all the program guide data in the satellite broadcasting receiver It is an object of the present invention to provide a method for receiving selective program guide information of a satellite broadcasting receiver capable of reducing the cost.

According to the present invention for achieving the above object, by receiving a program guide packet consisting of a CSSM packet having information about the receivable channels provided from the broadcast satellite and a PISM packet having the program information on the guide screen on the display device A method of receiving a program guide packet for each channel of a satellite broadcasting receiver for displaying, (a) a table for designating a position of a program packet in the PISM packet corresponding to each of the receivable channels included in the CSSM packet using an offset value; Constructing; (b) retrieving a location of a packet of program information corresponding to each channel corresponding to the number of channels displayed on the guide screen from the table;

(c) receiving a program information packet in the PISM packet designated by a position retrieved from the table; (d) decoding the received program information packet and displaying it on the guide screen; (e) program information packet in the PISM packet corresponding to a preset number of channels spatially adjacent to the channels displayed on the guide screen in order to secure program information for a new channel according to the scrolling of the guide screen. Receiving and storing in the memory.

1 is a schematic block diagram of a satellite broadcasting receiver used in the present invention;

2 is a flowchart for explaining a method for automatically updating a program guide screen according to a change in a stream provided from a broadcast satellite according to the present invention.

3 is a view illustrating a process of configuring a serial number table according to the present invention.

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

20: tuner and demodulator 30: microcomputer

40: MPEG decoder 50: signal processing unit

60: memory 70: OSD

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings.

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

1 is a schematic block diagram of a satellite broadcasting receiver used in the program guide update method of the present invention. As shown, the satellite broadcasting receiver includes a key input unit 10, a tuner and demodulator 20, a microcomputer 30, an MPEG decoder 40, a signal processing unit 50, a memory unit 60, and an OSD unit 70. ).

The key input unit 10 is composed of key metrics on a remote controller or its own panel, and generates and provides a key signal corresponding to the request by the user, in particular, a key signal corresponding to a request for a program guide screen of the user, to the microcomputer 30.

The tuner and demodulator 20 tunes the bit stream of the channel corresponding to the tuning control signal of the microcomputer 30 among the bit stream from the satellite received through the antenna (not shown), and then demodulates it so that the MPEG decoder 40 To provide.

The MPEG decoder 40 separates and decodes a broadcast signal provided from the tuner and the demodulator 20 into an audio signal, a video signal, and various program information, and provides the decoded signal to the signal processing unit 50. Also, the OSD unit 70 Data about various information provided from the data is also provided to the signal processor 50 after a predetermined signal processing process.

The signal processor 50 converts the digital video signal in units of frames provided by decoding from the MPEG decoder 40 into an NTSC or PAL signal and displays it on a television monitor (not shown), and decoded from the MPEG decoder 40. The audio signal is converted into an analog signal and output to a speaker (not shown).

The memory unit 60 stores various program information decoded and output from the MPEG decoder 40 described above under the control of the microcomputer 30.

The microcomputer 30 of the satellite broadcasting receiver generates a control signal for performing a function corresponding to the key signal from the key input unit 10.

Hereinafter, the present invention will be described in detail with reference to the flowchart of FIG. 2 illustrating a method of receiving selective program guide information of a satellite broadcasting receiver.

The program guide selective reception method performed in the satellite broadcasting receiver configured as shown in FIG. 1 starts from the step 110 of receiving a program guide packet provided from a broadcast satellite. The program guide packet consists of a CSSM packet having information on channels that the satellite receiver can receive and a PISM packet having program information. CSSM packets take precedence over PISM packets, and the satellite broadcasting receiver of the present invention receives only CSSM packets. Received CSSM packet includes Segment No., total channel count information, Service Channel ID (Scid) for each channel, Purchase Information Parcel (PIP), Description Information Parcel (DIP), Transponder No, channel number, channel name, and each channel. Contains offset specification information of the location of the program information packet in PISM.

In the next step 120, the microcomputer 30 constructs a table in the memory unit 60 that specifies, using an offset value, the position of the program information packet in the PISM packet corresponding to each of the receivable channels included in the CSSM packet. do. 3, a method of constructing a table in accordance with the present invention is illustrated. As shown, a series of CSSM packets is composed of packets having a plurality of receivable channel information, a series of PISM packets are composed of a plurality of program packets having program information for each receivable channel, these Each packet has 127 bytes of payload data. In this packet format, the first packet of the CSSM packet is set to the reference value "0", and serial numbers are assigned to each of the remaining channel information packets and each program information packet. And, for example, the program information packet for the channel 1 information packet with the serial number "0" exists at position "100", and the program information packet for the channel 1 information packet with the serial number "1" is position "101". The program information packet for the channel 2 information packet having the serial number " 5 " is assumed to exist at the position " 104 " In this serial number table, the offset value is "100". If any channel information packet is designated with reference to this table, the position of the program information packet can be found in the corresponding PISM packet. That is, the program information packet may be designated in the PISM packet by advancing the offset value "100" from the designated channel information packet.

In the next step 130, the number of the channel currently displayed on the guide screen is recognized, and the position of the packet of the program information corresponding to each channel is read from the serial number table.

Once the position of the program information packet for each channel is read from the table, in step 130 the microcomputer 30 specifies the offset position starting from the channel information packet, and the program information packet in the offset specified PISM packet is stored in the tuner and demodulator ( 10), and stored in the memory unit 60. In this case, since the maximum number of channels belonging to the guide screen range is typically seven, program information packets for these seven channels will be received.

According to the present invention, as in step 140, while receiving the program information packet associated with the seven channels in the guide channel range of the guide screen and corresponding to a predetermined number of channels spatially adjacent to the current receiving channel The program information packet in the PISM packet is further received and stored in the memory unit 60. This is used for the purpose of securing program information about new channels that are increased / decreased adjacent to the current channel number appearing on the guide screen when the user scrolls the guide screen in the up / down direction. The number of such adjacent channels is preferably limited to three to five in order to save a storage area of the memory unit 60 in which program information is stored.

Next, in step 150, the microcomputer 30 determines whether program information for new channels to be displayed is displayed by scrolling the guide screen up and down according to a channel up / down key operation from a user. As a result of the determination, when a new channel appears outside the range of the guide screen, the process proceeds to step 130 and repeats the above-described process. Therefore, program information about a new channel is received, and the received program information updates the program information previously stored in the memory unit 60.

However, if the guide screen does not move or if the movement does not deviate from the channel range of the guide screen according to the present invention, the process proceeds to step 160 and uses the program information stored in the memory unit 60 to guide. Refresh the screen.

Therefore, as described above, the capacity of the memory can be remarkably reduced by receiving only program information corresponding to the maximum number of channels within the range on the guide screen without receiving program information of all receivable channels.

Claims (3)

Receive program guide packet for each channel of a satellite broadcasting receiver that receives a program guide packet consisting of a CSSM packet having information about receivable channels provided from a broadcast satellite and a PISM packet having program information and displays it on a guide screen on a display device In the method, (a) constructing a table for designating a position of a program packet in the PISM packet corresponding to each of the receivable channels included in the CSSM packet by using an offset value; (b) retrieving a location of a packet of program information corresponding to each channel corresponding to the number of channels displayed on the guide screen from the table; (c) receiving a program information packet in the PISM packet designated by a position retrieved from the table; and (d) decoding the received program information packet and displaying the decoded program information packet on the guide screen. The method of claim 1 wherein the method is: (e) receiving a program information packet in the PISM packet corresponding to a predetermined number of channels spatially adjacent to a channel displayed on the guide screen; (f) storing the received program information packet in a memory unit for decoding, and the program guide selective reception method of a satellite broadcasting receiver. The satellite broadcasting receiver as claimed in claim 2, wherein the program information packet stored in the memory unit is updated with program information corresponding to newly set channels when the guide screen is moved up or down. Program Guide Selective Receiving Method.

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