KR19990056468A - How to Abandon an Error Program Guide Packet in a Satellite Broadcast Receiver - Google Patents

Abstract

The present invention relates to a method of abandoning an error program guide packet received at a satellite broadcast receiver. First, a series of program guide packets are received from a satellite, and the connectivity and checksums of the program guide packets are checked therefrom. At this time, when there is a packet connectivity error and a checksum error, the presence or absence of a master program guide packet is detected. If the master program guide packet does not exist, it is necessary to receive a special program guide packet until the presence of the master program guide packet is detected. The above-described packet reception step is repeated for the set number of times, and if the existence of the master program guide packet is not detected during the above, the reception of the program guide packet is abandoned.

Therefore, by immediately abandoning the reception of an error in the program guide packet, it is possible to immediately confirm the current state to the user, during which the program guide processor can handle other tasks, so that a more efficient program guide configuration can be achieved.

Description

How to Abandon an Error Program Guide Packet in a Satellite Broadcast Receiver

The present invention relates to a satellite broadcasting reception system, and more particularly, to a method of giving up a program guide packet in which an error occurs in a satellite broadcasting receiver.

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. The broadcasting system is a broadcasting system in which the selection range of information is greatly expanded compared to the conventional terrestrial or cable broadcasting system.

The satellite broadcast receiver used for such a satellite broadcast receives a bit stream provided from the satellite, processes the broadcast signal of the selected channel, and then provides it to a display device such as a television set. In this case, various information such as broadcast signals (image data and audio data), EIT (event information table), TDT (time data table), etc. for each channel are included in the bit stream provided from the satellite. Has various menu screens, that is, a program guide mode (hereinafter, referred to as a PGM) to display such various information. In the program guide mode, all broadcast program information is classified and displayed into items such as subject, time, and channel so that a viewer can select a desired broadcast.

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 a total of 15 program informations to be executed 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.

In the program guide packet received from the satellite, an error may occur in the packet due to an error of a transmitting side or a receiving side, and an error of failing to receive a packet due to overflow of the receiving side may occur. In this case, the user does not recognize the error of the program guide packet, there is a problem that does not provide accurate guide information when navigating the guide screen.

Accordingly, an object of the present invention is to provide a method for confirming and abandoning an error program guide packet received by a satellite broadcasting receiver.

According to the present invention for achieving the above object, a method of giving up the error program guide packet received at the satellite broadcast receiver, the method comprising the steps of: (a) receiving a series of program guide packets from the satellite; (b) checking for errors in connectivity of the received program guide packets; (c) checking a checksum of the received packet; (d) in steps (b) and (c), detecting whether a master program guide packet is present in the occurrence of connectivity errors and checksum errors, respectively; (e) in step (d), repeating from step (a) for a preset number of times to receive a special program guide packet until the presence of a master program guide packet is detected; (f) if the presence of the master program guide packet is not detected during the step (e), characterized in that it comprises the step of abandoning the reception of the program guide packet.

1 is a schematic block diagram of a satellite broadcast receiver suitable for implementing a method for giving up an error program guide packet according to a preferred embodiment of the present invention;

2 is a flowchart illustrating a method of giving up an error program guide packet in a satellite broadcasting receiver according to a preferred embodiment of the present invention.

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

10: key input unit 20: tuner / demodulation unit

30: micom 40: MPEG decoder

50: NTSC encoder 60: memory

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 suitable for executing a method for giving up an error program guide packet according to a preferred embodiment of the present invention. The key input unit 10, the tuner and demodulator 20, and the microcomputer 30 ), An MPEG decoder 40, an NTSC encoder 50, and a memory unit 60.

The key input unit 10 is composed of key metrics on a remote controller or its own front panel, and generates a key signal corresponding to a key signal corresponding to a channel navigation key related to channel up / down by a user to the microcomputer 30. to provide.

The microcomputer 30 of the satellite broadcasting receiver adjusts the program guide information provided from the tuner / demodulator 20 to the memory unit 60 according to the input channel up / down key input from the key input unit 10, and then adjusts the program guide information. Navigation on the screen of the television monitor using the program guide information will be described in detail with reference to FIG.

The tuner and demodulator 20 receives the master program guide information from the broadcast satellite through the antenna (not shown), demodulates it, and provides the demodulated information to the memory unit 60. The bit stream of the corresponding channel is tuned, demodulated and provided to the MPEG decoder 40.

The memory unit 60 includes channel information such as channel number, channel name, channel logo, and the like provided from the above-described tuner / demodulator 20, program name, category, program airing time, rating, and detail information. The guide program information such as) is stored under the control of the microcomputer 30 and the stored data is provided to the MPEG decoder 40.

The MPEG decoder 40 decodes an audio signal and a video signal from a broadcast signal provided from the tuner and demodulator 20. In addition, the MPEG decoder 40 synthesizes the program guide configuration data obtained from various program guide information provided from the memory unit 60 using the synchronization information within the video signal and outputs it to the video encoder 50.

The NTSC encoder 50 converts the digital video signal in units of frames provided after being decoded from the MPEG decoder 40 into an NTSC or PAL signal for display 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).

On the other hand, the microcomputer 30 according to the present invention is the error check of the connectivity of the program guide packet received from the program guide information stored in the memory unit 60 from the tuner / demodulator 20, and the checksum of the received program guide packet By checking (checksum), a process of abandoning reception of an error-prone program guide packet is performed.

Hereinafter, the method of the present invention will be described with reference to the flowchart of FIG. 2 illustrating a method of giving up the reception of an error-prone program guide packet performed by the microcomputer 30 according to the present invention.

The method of the present invention starts from the step 100 of receiving a program guide packet received through a satellite antenna not shown in the satellite broadcasting receiving system configured as shown in FIG. The received program guide packet in turn comprises a master program guide packet followed by a special program guide packet and a service channel ID packet.

In step 110, the microcomputer 60 checks the existence of the service channel ID packet in the received packet during the preset period, and when the service channel ID packet is confirmed to be received, proceeds to the next step 110, otherwise the service If there is no channel ID packet, it is determined that the reception is not possible and proceeds to the next step 115.

In steps 115 and 116, it is determined whether the master program guide packet has been received in the state of being unreceivable, and if the master program guide packet is not received, the packet reception is abandoned. This is because the satellite broadcasting receiver cannot operate itself unless the master program guide packet is received. However, if a master program guide packet has been received, the process returns to step 100 to receive the program guide packet again from the beginning.

Next, in step 120, a counter is used to check whether the received program guide packet is continuous. At this time, if there is continuity of the packet, the program guide packet is received in the middle and proceeds to the next step 130. Otherwise, the process proceeds to step 122 and again whether the master program guide packet exists. To judge.

If the master program guide packet does not exist in step 122 as well, since the satellite broadcast receiver cannot operate itself, it discards the currently received packet and returns to step 100. If the master program guide packet exists, it is previously received. Discard the packet and return to step 100 again.

Next, in step 130, it is determined whether the data size of the packets with continuity satisfies the size as provided by the transmitting side. In this case, if the size of the packet is not satisfied, the process returns to step 100 again to receive the program guide packet from the beginning. If the size of the packet is satisfied, the packet is transmitted to a parsing unit, and the packet is separated. Proceed to

In step 140, a checksum is checked on the separated packets to determine whether there is an error. At this time, if there is no error in the checksum, it is determined that the packet was received without any error and completes packet reception (step 145). Thus, the program guide screen can be constructed using the program guide configuration data from the complete program guide packet without error.

However, if an error is found in the checksum, an error has occurred in the separated master program guide packet and the special program packet. Therefore, the process proceeds to step 150 to check whether the master program guide packet exists again. However, even if a master program guide packet exists in step 150, it returns to the first step 100 to receive a master program guide packet with a checksum error, and if the master program guide packet does not exist, proceeds to step 160. do.

Step 160 is repeated to receive a special program guide packet with a checksum error as an error free packet, and the special program guide packet is repeatedly repeated for several tens to one hundred times when an error occurs due to a transmission rate or the like. Is performed. If a special program guide packet with no checksum error is received during iteration in step 160, the reception of the packet will be completed as in step 145, and in the meantime if the special program guide packet with error is repeatedly received Give up on receiving packets.

As described above, according to the present invention, when receiving a series of program guide packets, if a generated program guide packet is found, the user can immediately confirm the current state by immediately abandoning the reception of the packet. Since the processor can handle other tasks, a more efficient program guide configuration can be achieved.

Claims (3)

In the method of abandoning the error program guide packet received by the satellite broadcasting receiver, (a) receiving a series of program guide packets from a satellite; (b) checking for errors in connectivity of the received program guide packets; (c) checking a checksum of the received packet; (d) in steps (b) and (c), detecting whether a master program guide packet is present in the occurrence of connectivity errors and checksum errors, respectively; (e) in step (d), repeating from step (a) for a preset number of times to receive a special program guide packet until the presence of a master program guide packet is detected; and (f) giving up the reception of the program guide packet if the presence of the master program guide packet is not detected during step (e). 2. The method of claim 1, wherein the method further comprises the steps of (a) and (b) of receiving a program guide packet when no service channel ID packet is received during a preset period and the master program guide packet does not exist. (G) abandoning the error program guide packet received by the satellite broadcast receiver. The method of claim 1, wherein the step (c) is performed when a size of data of a packet satisfying the continuity is satisfied.